Hello everyone and welcome! Today is my KZread Birthday, and Engineering Explained is officially 9 years old! Thanks for joining in, I really appreciate it! As for the video, I have wanted to make a video on rev hang for a long time, but wanted to make sure I had it right. I've discussed this with numerous powertrain engineers, read through academic literature that relates to the subject, and boiled it all down in this video. Quite excited about this one, hope you enjoy!!

@adarco99

3 жыл бұрын

Thank you for helping us understand complex systems and why they're used in the first place!

@RenanBorges96

3 жыл бұрын

You're a maaaad man Yayson!! I'm watching you since the very first day of my mechanical engineering college degree here in Brazil. You totally deserve the best!!

@mattsteelephoto

3 жыл бұрын

Happy Birthday EE and congrats Jason!!!

@SE3552

3 жыл бұрын

Been here since the smaller whiteboard.

@chandreshverma6419

3 жыл бұрын

Happy Birthday EE🎂 And a big congratulations to Yayson!!! Just love your videos.... Lots of support from India☺

It doesn't matter how hard or soft I shift, there's still a jerk in the driver's seat.

@johncary4302

3 жыл бұрын

My passengers get jostled around like a friggin washing machine

@TheTman9898

3 жыл бұрын

@pete smyth quality comment 😂😂

@fromisheon4867

3 жыл бұрын

And old people like my dad and mom think I don't stick very well because of jerkyness. And my mom thinks my dad is better I am and I think I am way better than him.

@OscarSabaterCruz

3 жыл бұрын

if you want to avoid jerkiness, use more clutch. But to avoid burning through it you should be able to time correctly the gear, soft releasing of the clutch and rpm, and it'll go smooth as hot butter.

@2Str0k3

3 жыл бұрын

@@OscarSabaterCruz You dont need to use more clutch to shift smoothly. It depends on what you'r engine rpm's are when you release the clutch. You can shift basically shift smoother than most automatics if you know how. And without sliding the clutch. And there is no need to change gears like driving a freaking race car. Rev hang can be compensated with slower shifting. Its not like you lose any time shifting slightly slower in normal driving. All cars are different to drive and its only a matter of getting adapted to the vehicle you're driving.

I had a throttle body freeze up while going down a hill in winter, now THAT was some rev hang...

@zaceryhammond1144

3 жыл бұрын

Oh geez 😆

@Alex462047

3 жыл бұрын

I'll bet.

@MrMiatalover

3 жыл бұрын

Was it a 76 Rabbit? Mine was.

@sconescrewdriverson

3 жыл бұрын

Might be because of the increased fuel needed to start and keep engines running in winter... could also be a leaky injector. Get your engine checked out.

@bryanmasis1595

3 жыл бұрын

Drive by wire?

I surprisingly understood everything. And I'm a dentist. As they say.. if you can't explain it to a ten year old, you don't probably understand it yourself.

@droplifter3435

2 жыл бұрын

All I keep imagining, is a reverend throttling a dead body, and being sentenced to hang.

@Tom_Hadler

2 жыл бұрын

Never met a ten year old dentist before. Well done

@glenwaldrop8166

2 жыл бұрын

@@Tom_Hadler beat me to it. I'd wager he's probably pretty good at understanding most things if he's a ten year old dentist.

@dehypnotizerz

2 ай бұрын

​@@Tom_HadlerJudging by his login, he's from India. Everything's possible there 🤐

@meetankush

20 күн бұрын

@@dehypnotizerz The founders of the internet started it in the hopes of making the world a better place to live. They forgot to account for your existence.

You failed to mention that cable driven throttles usually have some mechanical non linearity built into them. If you look at the part the cable goes around, you will notice it's oval. Otherwise good video. I have just converted my car to drive by wire with an aftermarket ecu, and can confirm no rev hang, it's all in the tuning, as you say, it's a deliberate thing built into Oem cars, not a limitation of the technology in general. Electronic throttle, when you can set it up yourself is awesome.

@petebusch9069

14 күн бұрын

We use different throttle cams on our motorcycles to change this.

@Past10Performance

Күн бұрын

​@@petebusch9069ya I'm really surprised a channel of this quality didn't mention that throttle cams are almost never actually just round and are almost always oval or egg shaped for this exact reason

I’ve seen mechanical throttle bodies with a “cammed” lever so that the airflow increase is more proportional to input at the accelerator pedal.

@joelrolo1915

3 жыл бұрын

thats really interesting, thanks for sharing!

@aitorbleda8267

3 жыл бұрын

I think that most have that.

@donhappel9928

3 жыл бұрын

@@aitorbleda8267 Yes; I was surprised he left that detail out. I was all but shouting at the screen over it.

@pbakker

3 жыл бұрын

I believe Porsche used that in their older (?) cars. So that the driver gets a more aggressive feel when applying the accelerator.

@lolbuster01

3 жыл бұрын

Honestly I haven't seen many that don't have a cammed lever.

I would love to see a modern engine with today's materials and tolerances ran with all mechanical/carb then converted to all electronic and see the actual mpg differences and emissions.

@atarvhegde5210

3 жыл бұрын

Well EFI does help. I can't say the same about Electronics throttle body

@erich6860

3 жыл бұрын

@@atarvhegde5210 All these things "help", I just wonder how much. 1-5-10 mpg. Something like a mid 70's slant 6, remade with all modern tolerances and materials comes to mind. That thing got nearly 20 mpg at 3.7L,,,, just at 125 HP, but it was a loose motor.

@jeevanrohtak5126

Жыл бұрын

Eric man , you gotta come and live in the 21st century man

@erich6860

Жыл бұрын

@@jeevanrohtak5126 Jeevan man, you gotta pay attention to what I said. I shall explain it to you, since you seemed to have missed it. I am curious how much fuel efficiency is in the electronics, vs the upgrades machining technology and materials. So, in short, pay attention to what I was saying, and not what ever thought just possessed you to type what you did, man.

@michaelbenardo5695

9 ай бұрын

There would be no way to make it streetable unless it had a much milder camshaft and smaller intake ports. Also, today's emissions standards almost require a dry intake manifold. That's why no throttle body fuel injection. It wets the intake just like a carb does.

Literally couldn't be a more intuitive and thorough explanation. That was an amazing video.

4:07 This engine is super clean.

@cerealkillr12

3 жыл бұрын

3:34 SUPER CLEAN

@jGRite

3 жыл бұрын

sUPeR ClEaN

good thing that my throttle is cable operated then again my scooter doesnt have any gears...

@JPRTonundFilmstudio

3 жыл бұрын

Probably has a carburetor as well, doesn't it? Would be interested to see these curves of lean/rich mixture when closing or opening the throttle valve of a carburetor-engine :)

@stephenpowstinger733

3 жыл бұрын

HECKproductions a Cushman possibly. Slowest scooter ever developed.

@BoliMeKurac

3 жыл бұрын

My scooter had cable operated throttle. It snapped @120km/h and stayed wide open when I had to brake for a corner. I'm alive only because I reacted fast and hit the engine kill switch

@billbergen9169

3 жыл бұрын

@@BoliMeKurac Learn to check cables! I had a drywall jack fall on my head because of a faulty cable.

@nicholaslau3194

3 жыл бұрын

same, but i dont even have a car

I don't know why I'm watching this, I can't even afford to fix the suspension in my 1993 Audi 80. Edit: As of last month, sadly she is deceased, had a crash at a car meet, front ended up totalled, wrecked intercooler. Spent some good years with her, Rest in Peace.

@toottootfuckshit8755

3 жыл бұрын

B4 2.0L?

@ghshrksidhc5460

3 жыл бұрын

@@toottootfuckshit8755 B4 1.9 Turbo Diesel

@toottootfuckshit8755

3 жыл бұрын

I have the 2.0

@bermchasin

3 жыл бұрын

F

@mattagnew206

3 жыл бұрын

The people are supposed to meet, not the cars! Sorry to hear about your 80. I had an abusive relationship with a 4kq.

Idk why I'm watching this, my car is carbed.😂

@jeredek9901

Ай бұрын

Cus it's fun

@Dizzle13

Ай бұрын

Bro my exact thoughts as I clicked on this

@ajj9703

Ай бұрын

W

@bongboi2831

Ай бұрын

I dont like my carb so im gettin a throttle body injector

@Shiba_25

29 күн бұрын

I don’t know why I’m watching this, I can’t even afford a car.

I would love to see you take a shot at tuning a car. With all of your knowledge, that may be interesting to watch.

@XmaXma6

3 жыл бұрын

He had an s2000 which he supercharged (and then sold for the mx-5) and a integra he tried a small series of build vids on, but it got stolen or something.

@PushyPawn

3 жыл бұрын

With modern cars, tuning has become obsolete, impossible to do and unnecessary. All "tuning" variables are controlled by the Engine Control Management computer via sensors and electric/hydraulic actuators. The ECM senses all properties of the air going in, the exhaust coming out and controls all aspects of combustion through throttle, spark, fuel and valve timings together with auto trans behaviour (if equipped). This makes tuning a modern engine impossible as there is nothing to tune. Optimal operation is maintained on the fly, hundreds of times/sec and compensates for all external variables including changes in the engine as it ages and its internals get worn and fouled up. The only way to alter this behaviour is to re-map the ECM's memory using a proprietary, car make specific, ECM programmer, access to which is tightly regulated and controlled and the cost of which is very expensive. As for older cars, he would most likely struggle and fail. Being an experienced mechanic and a knowledgeable engineer are two completely different professions comprising of very different sets of skills and abilities.

@BeaverLakeMotorsports

3 жыл бұрын

@@PushyPawn What fantasy world do you live in? have you ever heard of flash tuning? it exists for pretty much everything out there.

@CalculatedRiskAK

3 жыл бұрын

@@PushyPawn In current times, "tuning" is a word that refers to ECM/TCM recalibration via flashing the memory. We aren't talking about the primitive engines of yore.

@yaris5150

3 жыл бұрын

@@CalculatedRiskAK right lmao? like this isn't obvious information already/even inconsistent with the video, having "modern" in the title

The answer to any modern car problem: “it’s to control emissions”

@meemdoggoriginallongdrink

3 жыл бұрын

Ikr. It's quite ironic that 90% of the cars in sale are crossovers. Because they are sooo eco-friendly

@jupitersailing6911

3 жыл бұрын

Yeah but it’s understandable I mean at least they are trying new technology to help save the planet

@TheSupergunman3000

3 жыл бұрын

@@jupitersailing6911 I think it does not make any difference, whether you want to decrease emissions or not, it will not destroy a planet

@breabanm

3 жыл бұрын

and that's why we are going to shift to electric drive sooner or later, subsidized or not

@JamesBrown-ux9ds

3 жыл бұрын

Yes - and this is nice way to sell it to the public as: there is plenty more reason of course. For instance it is much cheaper and easier to have an additional cable in the harnees to to the engine, compared to the good old wire-able solutiion. And e-gas usually takes its data from a data-matrix in the cpu - data based on the manufactures measurements during vehicle developme'nt. But some of theses e-gas just seem to be bad quality, cheap plastic etc. and often don't last very long. And the production, distribution and installation of replacement parts is as well effort, harming the environment.

You totally nailed it. I used to do emissions testing at Ford back in the 80s when cars were transitioning to 3-way catalyst necessitating, prior to EFI, feedback carburetors to attempt to control to stoich AFR. But with carbs there were all sorts of AFR excursions during transient tip-in tip-out modes, and on a tip-out, all the wet fuel clinging inside the intake manifold suddenly vaporized and sent this huge HC spike which blew through the oxidation catalyst. Remember dashpots on the carburetor? This slowed the closing of the throttle to it's idle setting to attenuate the fuel vaporization rate, the first form of rev-hang. But even on my 93 Mustang with EFI and cable actuated throttle, it has the annoying rev-hang, but this is the idle speed control valve acting, like drive-by-wire throttle, to bypass air to achieve the same emission control goal. Just some retro perspective to ponder. The guy below said it succinctly, 'it's to control emissions'. Today, there are regulations to be met, vastly more stringent than the 80s. Give credit to the engineers that achieve them and build engines like the Coyote, LT6 and Hellcat.

I really enjoy your videos. As a car enthusiast, I feel it’s important for me to understand how cars and all their components work. Your videos make that easier for me!

Me: presses pedal to 25% hoping for 50% air Gets 25% air. :O

@whoknows1631

2 жыл бұрын

Windbooster throttle controllers

Every video I see like this just gives me another reason to hang on to my 90's cars.

@matufujiwara7493

3 жыл бұрын

welcome to club. im still driving 1977 carb car with only electronic device being radio. ill take old car everyday over these pieces of junks they call cars nowadays. imo theyre more like robots. you cant even do what you want, emissions emissions emissions everywhere

@spackle42

3 жыл бұрын

I know, right? I kept my clydesdales and carts, and I never experience rev hang!

@tostadorafuriosa69

3 жыл бұрын

Ultil they are so old they fall to pieces.

@fer1306

3 жыл бұрын

Yea stay in a cave

@frizzen

3 жыл бұрын

This isn't a new problem. 1975 VW Rabbit had major rev hang. It had an "anti-backfire valve" that held the throttle open. It was pretty awful. Without the valve, it backfired EVERY shift.

This was a great video! It made me do some thinking about a 2002 Mustang 4.6L I had years ago. It had terrible rev hang, but mechanical TB. The fix was to restrict the airflow of one of the lines connected to the TB by inserting a metal plug in the line with a small hole drilled in it to allow a small amount of airflow. I can only assume that this line was how the ECU added air when lifting off the throttle similar to what you explained here. By restricting that airflow, the rev hang was reduced.

Excellent description! The other day, I drove a 2018 Jeep Wrangler with a manual and I noticed the rev-hang and the rpm being too high when I hit the next gear. I drive an older Alfa Spider that has no rev-hang and I can feel the rpm match as I up shift. With the Jeep, I was always at too high rpm. I owned a 2017 Toyota Corolla iM and I also noticed the rev-hang. I thought it was due to how freely the motor revs. Now that I've watched this video, I understand the process. Thanks again for another excellent video!

Dude... I’ve been wondering about this for YEARS with my car and never thought it had anything to do with the drive by wire throttle, just the stock flywheel. Thanks!!!

@davidpistek6241

3 жыл бұрын

Compared to my s10 or 10 speed big trucks my civic si is not as smooth due to this I'm not as consistent

@nerdyengineer7943

2 жыл бұрын

My vehicle has a mechanical throttle, but I have lots of rev hang. I bet it's using the idle air valve to accomplish it.

@permabulk1454

2 жыл бұрын

@@nerdyengineer7943 me too. My 04 gto doesn’t have rev hang but the initial grab into 1st gear has always been the most finicky I’ve ever felt in a car. I had a 2001 cavalier z24 manual 5 speed (obvi with fwd and electronic throttle) and for some reason engaging first in that car was way simpler than the gto. Any other gear from second to 6th is completely normal (tho a bit slow due to the weak clutch/slave from the factory) but something about 1st gear in it with the drive by wire creates the most odd feeling 1st gear engagement

@alexvillalobos7137

Жыл бұрын

@@davidpistek6241 lol Im in the same bag. My s10 extreme drops the rpm’s fast so I can shift a lot faster. My type r…. The rims take forever to drop. I don’t go hard in the car but when I do I might bang gears. 6000+ rpm’s can’t be good for my clutch. Smells stronger than any car I’ve had. My s10 or Camaro ss have never smelled like burnt clutch while banging gears.

@michaelbefumo-qg7ji

Ай бұрын

My 08 Ford expedition with drive-by-wire 1.4 low it changes the throttle input so if you bounce on the throttle it won't be jerky and full it changes the throttle input so if you bounce on the throttle it won't be jerky in low range four-wheel drive smooth

Makes me remember looking at my BMW E46 shop manual and seeing the electronic throttle circuit labeled as "Torque Request". We know who's the boss now...

@SonsOfLorgar

3 жыл бұрын

*Skynet sees you*

@russlehman2070

3 жыл бұрын

It ain't the driver. With antilock brakes, traction control and electronic throttles, the computer's in charge. Don't get me wrong: that stuff works amazingly well most of the time, but I do find that the traction control especially on occasion will cut the throttle back to nothing at the worst possible time.

My dad has a 19 Subaru Impreza, It's the first car I've driven to have so much rev hang that I needed to learn how to drive "around" the hang. I thought it was just a crazy heavy flywheel! Great video! I'll have to check it out later lol

@robertoarkenburg6652

Ай бұрын

Thanks for sharing, I have an Impreza from the same year and this makes me regret getting the cvt version less.

You absolutely nailed it when you explain the advantages of electric throttle for the driver feeling part. Thank you so much!

I've had this for the first time with my Evo X and I thought I was just being a terrible shifter! I tried to explain it in the evox forums and everybody just said I was shifting wrong. Glad someone finally got this fully explained out, it was fantastic!

@NathanaelNaused

3 жыл бұрын

If you've driven older cars or a different model that drives properly then coming to this will frustrate you a lot.

@centuryhelix8727

3 жыл бұрын

I had the same exact thing happen to me in the Scion tC community. Everyone told me that I was either shifting wrong or Needed to get a lightweight flywheel 🤦‍♂️ I just wanted someone who could tune it out

@qleap99

29 күн бұрын

Evo X also and first time I experienced it as well. Wondering if it can be tuned out during the performance tuning process.

I love watching these videos on my lunch breaks lol. Everyone assumes I’m taking an online math class or something lol

@SquishyZoran

3 жыл бұрын

I’m doing that right now!

@LightningSe7en

3 жыл бұрын

Lol on my lunch break too

@JeeveDaniel

3 жыл бұрын

Me too lol

@Brandon-xe2se

3 жыл бұрын

Oh my lord I cant believe I'm not the only one

@chrisdonnelly5904

3 жыл бұрын

Well that's because you are LOL

I had a carbureted vehicle with a vacuum dashpot actuator to accomplish the delayed throttle butterfly closure, too. That general system was not exactly uncommon toward the end of the days of carburetors on on-road automobiles. It’s also interesting the discussion about how one _could_ use electronic throttle control to make the relationship between pedal position and delivered power more linear. Why I think it’s interesting is that we don’t see that actually done. What we see instead is that electronic throttles are programmed to provide ridiculously overdone tip-in, because that makes people _think_ their car is really fast.

That was the big thing that stuck out to me when I test drove my '13 Civic SI. Compared to the RX8 I was trading in, there seemed to be substantial rev hang.

@ChrisBrown-pz2gu

2 жыл бұрын

There was zero rev hang on my RX-8

Oh so that's why my car sometimes jerks when I shift and keeps the revs longer than older cars when clutched in... Good to know :)

@dhoffnun

3 жыл бұрын

Yep. I just spent the past handful of months learning that the hard way, and then this video comes out. I learned to drive on a throttle cable - and when I got a newer manual it took me forever to drive it smoothly... and I have to wait sooo looong between gears. Yes yes fuel economy but I WANNA DRIVE

@saltdaemon4453

3 жыл бұрын

yep quicker, more difficult clutch jobs.

@desposyy

3 жыл бұрын

I just thought 5 years off the road had just made me rusty

@umairumair1680

3 жыл бұрын

When u shift up for example from 2nd gear to 3rd gear do not fully release accelator paddel try to keep u r car in 1500rpm when shifting up u r gear .. in this case ur car engine will be in motion and u r car will not jerk by releasing cluch

@hyakinthos_0902

3 жыл бұрын

I was thinking iam shifting my car wrong all this time lol

Can we just be happy that at the very least manual is still in some cars, we need to appreciate this more.

@snowysysadmin59

3 жыл бұрын

That wont be for long unfortunately

@6six9nine74

3 жыл бұрын

@@snowysysadmin59 Mine will never leave its body

@jonathanmayfield516

3 жыл бұрын

I managed to get a 2012 Chevy Sonic with a 5 speed Manuel and I barely feel a jerk.

@paul-4872

3 жыл бұрын

Ford just announced a new manual (the bronco) not that long ago hopefully this means they come back if it’s successful

@jonathanmayfield516

3 жыл бұрын

@paul. Here's hoping

What’s crazy is, I had no idea what I clicked on and was just trying to see another informative manual trans video. After watching, I realize that this situation implies to me so directly and I had no idea it was happening. My last car had so many emission problems to the point I dreaded my two year testing period 6 years straight. I see now I had a serious top out problem and my new car definitely solves the issue.

Such good info my dude, keep up the amazing content! Love watching your channel

4:08 look at that SUPER CLEAN intake hose

@SpeedHunter_9

3 жыл бұрын

Thought no one's gonna notice that LOL

@adamrozman

3 жыл бұрын

Someone’s watching Chris fix videos 😉

@gabrielv.4358

Ай бұрын

bahahaha

I've always heard that Subies had rev hang because it helped emissions and I'd always been curious as to how dropping the RPM slowly would do anything, so now I know! Great video, thanks!

@wim0104

3 жыл бұрын

the software throttle is also a pain for hill starts with cold engine (stickshift 2011 outback)

@RidinDirtyRollinBurnouts

3 жыл бұрын

This is a lot of cars, the EGR feeds back into the intake and the idle-bypass will be open during liftoff so lots of rev hang. Its the same bypass that makes your engine idle high in cold starts.

@catinthehat5140

2 жыл бұрын

They fixed this in the new wrx

@twinboost9325

11 ай бұрын

My SF Forester has the most obvious hang of any car I've owned, it got more pronounced when I cleaned out the intake and Idle air solenoid, I thought I may have busted something at first.

@riley1733

5 ай бұрын

I drove two Subaru's and to my knowledge, neither of them had it. Both were standard and one was an Impreza and the other one was a WRX. I have a Honda Civic Si Coupe now and that car has massive rev hang. I haven't experienced it in a Subaru yet to my knowledge but I know Honda cars have it in some of them. It's really noticeable in mine if you look at the rpm's closely when you're shifting the gears.

Informative and good explanation. Note that even some of the last generation of electronically modulated carbureted cars in the early to mid 80's used dashpots on the carburetor to delay throttle closing.

What a fantastic and educational video!! Really well explained and you answered all the questions I've been wondering about!! Thank you for solving all the mystery out of it!! 🙏☺️

Rev hang kills the driving experience for me, and it’s why I will soon be selling my manual Crosstrek. It just feels like such a chore to drive.

@EngineeringExplained

3 жыл бұрын

Haha, the Crosstrek isn't exactly a great representation of a fun to drive vehicle, but it's an excellent car. I'm happy with the manual.

@truantray

3 жыл бұрын

Crosstrek...the ultimate enthusiast driving vehicle.

@joelhenderson3723

3 жыл бұрын

I have a manual Honda Fit, and while I'm not thrilled with the shifting experience, I wasn't expecting much- it's an econobox, after all. Even with the complaints, though, it's slightly more fun to drive a manual Fit than a CVT, and more important to me is the fact that any extra physical engagement helps keep me that much more alert.

@DanielSanPedro

3 жыл бұрын

I feel the same way. I despise my Honda HR-V because of it. But now I can be at peace with it. But the first chance I get to burn it with fire... errr I mean sell it and get something better, I will

@fabriziom

3 жыл бұрын

Realized with many cars with rev hang that if you lift off the gas pedal before pressing the clutch it usually works much better. Completely counter intuitive but I tried this on many cars and it seems to work. Of course for race starts it doesn't work and shifting is awful 😊

Few things are more satisfying than responsive revs, up or down. Rev hang ruins the manual experience

@TheExplosiveGuy

3 жыл бұрын

Got that right. I want my car to jerk left when I stomp on the gas, and jerk right just as fast when I let off. A motor should decelerate just as fast as it revs up...

@jscott1000

3 жыл бұрын

I agree. Some modern manuals will prevent the engine from stalling or even restart automatically. Enough. Make manuals actually manual.

@gainzplz4028

3 жыл бұрын

Right? Idgaf about emissions on my weekend car, I just want it to feel like a real car. Not like these babysitter cars that have 100 different electronic systems on them (like ESC) making everything feel numb and dull.

@QualityDoggo

3 жыл бұрын

They should keep it electronic for automatics because of the listed advantages (especially as the sensors/computers get more complex they can boost efficiency) whereas manual should be a simpler mechanical system the way people understand (at the cost of some engine-level controls that are only possible with the computer system anyways) Plus someday there's gonna be a significant split to self driving cars where there is no human-shifting or "pedal feeling" anyways

@QualityDoggo

3 жыл бұрын

Gainz plz to be fair they have some advantages for performance too - humans only have so many limbs but the computer can control/monitor hundreds of points, but like he said it's up to how the computers are tuned/configured - most consumer cars right now are just meant for a smooth efficient ride... they should give more options to have either manual or power/control-tuned systems (interestingly, Tesla cars have some of this: because the motor is entirely electronic they can accurately control stuff like how much power is pumped into it at different speeds - apparently destroys your efficiency but gives crazy acceleration especially at low speeds ) Definitely need more modern cars that keep the "fun manual" experience one way or another though :/

This is absolutely STUNNING. Fantastic! Thank you for answering everything I've been trying to figure out with manual transmission frustration. Amazingly well researched and presented.😀

I like how far you went to fully explain it. Precise and thorough

Imagine this: carburetors would actually fix the throttle tip in and tip out problem. I mean there's a million other problems it comes with but it fixes the problem.

@matufujiwara7493

3 жыл бұрын

he should make one big video about carburators. people these days are not familiar with carburators at all. with carburators once you let off throttle, the vactium starts sucking alot of fuel thru idle jet, and its massive amount that it sucks there. this was on old carbs so with old carbs you saved fuel when you went to neutral when letting off the throttle because it sucks tons of fuel when throttle is closed and rpms are over idling rpms. now newer carbs in the end had a valve that closed idle jet channel when rpms were over some certain rpms and throttle was fully closed. it opened back up if you press throttle or rpms droped below this certain rpm, but even this sort of system richens af ratio when coming off the throttle cuz it takes time to close that valve. but it did improve fuel consumption. now carb system itself always has problem that when you press on the accelerator the mixture is very lean for a moment, its that much that engine actually might want to shut off. this is mostly because some channels little bit flow down so the fuel isnt being sucked instantly and it takes slight time to suck them back up. to overcome this very lean mixture, all of the carbs (not including small scooter and chain saw carb cause their engine size is so small that theres no need for this thing) have a thing called accelerator pump which straight up pumps fuel into the intake while your pressing the throttle. full throttle press gives you about 10ml of fuel in the intake (this amount is taken from 1.5l inline 4 engine). now this fixes the problem of lean side, but it actually richens mixture alot so again you have bad emissions, so mixture with tip in and tip out is very rivh. now this accelerator pump is very useful for cold starting. you pump certain amount of fuel into the engine, and my car has started instantly even with -30degrees. something injectors never achieve cause they need first 2 rotations to get pressure up in fuel pump. carbs have, and always will have worse emissions compared to injection.

@normanguzman417

3 жыл бұрын

​@@matufujiwara7493 I live in Puerto Rico back on the 80's and we let our cars in 2nd or third gear going down the mountains to preventing boiling the brake fluid b y over heating the brake caliper going down hill for 10 minutes straight. When throttle body is close, it can't take more fuel than the idle jet will allow because there is a size restriction that won't allow more fuel trough the passage. therefore It will use no more fuel than what it will use for idle.

On one of my carbureted motorcycles it has different cable cams to change the rate the throttle is open in relation to the grip. Still if you wack it to WOT it’s still open but it does help make the throttle position to power out put more even. Also on fly by wire motorcycles the slight delay in throttle response is really noticeable. Every time I get on one it takes a few minutes to get used to it. On motorcycles where you’re so connected to the machine and road the fly by wire is not my favorite thing. I believe they can make it better and throttle hang has never been an issue I’ve noticed on them. Could be due to the ITB that motorcycles have.

@K0nst4nt1n96

3 жыл бұрын

Jake TheGardenSnake i have ridden newer bikes where you dont really feel the delay but older bikes with e throttle do really feel different. Also carb vs no carb.

@jmmycnnll

3 жыл бұрын

I was thinking the same thing. Just take a cable cam that is elliptically shaped and it would start opening slowly and thereby straighten out the torque/throttle position curve. Cool to hear that they are using that on motorcycles!

@jamesmoechnig3855

3 жыл бұрын

The carbs on the old bikes I've messed with have a vacuum-regulated venturi downstream of the throttle plate. This is essentially a gate valve that restricts airflow like the throttle, but for the purpose of maintaining uniform air speed through the venturi to ensure consistent fuel draw and atomization. I haven't ridden a motorcycle with electronic throttle, but I would expect any delay to be disturbing.

@xXdatkid411Xx

3 жыл бұрын

Hey, Jake! Wanna say some cars have the same "cam" on the throttle shaft.. love the vids!

@jeffbrownme2

3 жыл бұрын

Love your mt07 series Jake, but I couldn't get over the jerk throttle response of mine. Got a cbr650r. The jerk is still there but much more maneagble in a smooth 4 cyl.

This dude is so clear and concise on difficult to describe subjects. I love it

I loved that SUPER CLEAN easter egg above the intake conduct on the cleanest car.

Thank you! After I got my manual BMW, I thought I had forgotten how to drive stick because I kept getting weird revving when I was shifting. Now I know what it is!

@L39T

3 жыл бұрын

I too experienced the same thing. It is still driving me nuts after a year of owning the car

@danielbelousov742

3 жыл бұрын

@@L39T I was learning to drive stick on a new Subarua and was pissed that I have to wait for something to happen when realising the clutch.

@wim0104

3 жыл бұрын

just give it some gass when you let the clutch bite. or a lot of gas; the 6 speed subaru transmission is pretty strong now :-)

@spralwers

3 жыл бұрын

Many manual BMWs also have clutch delay valves. Look up if yours has one and get it either removed or replaced with a valve that doesn't delay.

I seem to remember that cars with a mechanical throttle would rev hang. There was a device called a dashpot that slowed the closing of the throttle thus reducing emissions.

@NathanaelNaused

3 жыл бұрын

Correct. Tune can help this or some physical mods to the valve.

@jamiepeterson5646

3 жыл бұрын

Yep, exactly right. I think the N/A AW11 MR2s used a dashpot, but the supercharged ones didn't, for example. On the other hand, all 3 cars I've had have had mechanical throttle bodies without a dashpot, so I don't think this method really took off until the electronic throttle bodies made it trivially easy.

@russlehman2070

3 жыл бұрын

Those were mostly on cars with carburetors. They tended to run very rich coasting at minimum throttle, which meant they ran very dirty. The dashpots I remember were vacuum operated and would keep the throttle from closing fully until the RPMs came down.

@rogerpearson9081

3 жыл бұрын

Yup, a mechanical solution but for the same reason.

Man I like your videos so much, even though I get bored about that part of mathematical calculations you always do.... still, you are a natural great teacher and I admire the energy and quality you put into your content. I will always support you no matter when you get boring. Congrats!

You also just described what Banks monster pedal does. Good job as usual.

4:09 So considerate of Jason to thoroughly wash his engine bay so that it’s super clean on this video! 🙏

@emmanuelvazquez5036

3 жыл бұрын

Looking for this!

@DeenHameed

3 жыл бұрын

Chrisfix has entered the building...

@nopleaseno2515

3 жыл бұрын

It’s not a grocery getter, it’s real world used.

@Conservator.

3 жыл бұрын

@@nopleaseno2515 I think you might have missed the joke. Have a look at the fragment in the video. Jason had left a message there. At 4:09

@nopleaseno2515

3 жыл бұрын

@@Conservator. oh yes you’re correct. Guess the joke wasn’t funny.

I always thought it was due to the heavy flywheel! I hate the rev hang on the ND :) Thanks for teaching me something new once again

@EngineeringExplained

3 жыл бұрын

I'm not sure what you're comparing against, but rev hang on ND is actually quite minimal. The Crosstrek is awful haha.

@jesperviktorsson8027

3 жыл бұрын

I cant even drive any car thats drive by wire, my shifts turn to dogshit compared to my e34 bmws

@nickstephenson9482

3 жыл бұрын

@@EngineeringExplained The rev hang is definitely less than some other cars , but it's still very noticable on my ND when compared to my NB. I thought there was something wrong with my car when I first bought it, but I have since gotten used to it. Great video as always!

@AaronSchwarz42

3 жыл бұрын

@@jesperviktorsson8027 practice makes improvement, surgeons are not born; they are made // hang in there :P you eventually master each setup ///

@PushyPawn

3 жыл бұрын

@@EngineeringExplained The rev-hang is much more pronounced in certain makes while others don't have it at all. If yours does, with practice it can be avoided by including ~1/2 second wait between lifting off the gas pedal and pushing in the clutch to change gear. With enough practice this timing becomes automatic, you stop noticing it and there's no time/performance penalty when changing gears.

Your videos are amazing, I appreciate all of the graphs and numbers as an engineering student

I enjoy the depths you go into every project! I’m a fan of both setups. Application of when and why you use these two types is real.

Great explanation. Wondered why I could never get my new Civic 6 speed to shift smooth, especially from 1st to 2nd.

@GradeEhCanadian

3 жыл бұрын

Same here first to second is the worse in my mazda

@PurpleDinoRhino

3 жыл бұрын

I have an 18 si, rev hang used to be really bad, but with a tune, it's pretty much gone. I also have a new clutch with lightweight flywheel.

@dhoffnun

3 жыл бұрын

Yep. The thing I miss most about my 6th gen Civic is its gearbox. It gave close to zero fux, and shifted as fast and smooth as you could. Meanwhile my new car with its bigger and more powerful engine is WAY more sedate because shifting is more like throwing a baseball to someone across the field than tossing it between your own hands.

@_M27_

3 жыл бұрын

Same on my dads '13 1.6D focus

@jacobchaney

3 жыл бұрын

Get a Ktuner or Hondata. You will have the option to turn rev hang off (as well as many, many other things). You can also turn on launch control.

Me: EE has a new video out but the topic doesn't really interest me Also Me: Watches the entire video and learns more than I ever did in a day of school

@teamjg277

3 жыл бұрын

SAME!

@the_kombinator

3 жыл бұрын

LOL did you pay attention in that day?

@ThisGuyTalks

3 жыл бұрын

@@the_kombinator Absolutely not. This is all making sense now.

@kyleklassen3660

3 жыл бұрын

You know where he learned this stuff?

@ThisGuyTalks

3 жыл бұрын

@@kyleklassen3660 At a Holiday Inn Express?

Awesome flick! Perfectly explained many aspects of my own car that I’ve always wondered about, thanks!

Incredibly interesting video; I notice this with my recent new cars and have learned to adjust for it by waiting for revs to drop before shifting. But it’s annoying.

Sometimes I fail to understand half of what he's talking about, but despite my ignorance I always appreciate this man's passion to explain everything and how much he knows his stuff. Happy birthday btw, best wishes from Argentina

Rev hang is my excuse when I lose to ecoboost mustangs in my base model 2019 Mazda3

@NathanaelNaused

3 жыл бұрын

Although in a race scenario it would help you go faster because it's kinda like a half of a power shift. But I got the joke lol

@evan8tor21

3 жыл бұрын

Nathanael Naused i was able to keep up with my friend’s ‘01 Audi A4 with a v6 so it perhaps helps a bit.

@RidinDirtyRollinBurnouts

3 жыл бұрын

A first-gen Mazdaspeed 3 would put the hurt on an ecoboost stang

this is so informative. Never knew electronic throttle had so many benefits. I have just written it off as newfangled over engineering. Especially with a stick shift I'm constantly tipping in and tipping out. Never knew that was creating more emissions.

Great content and very informative!👍🏽! Your always on point 👍🏽

But for real though, if I waited for my rpm to match for my upshift while going up a hill, my truck would literally be rolling backwards by the time the rpms matched.

@doogetube6017

3 жыл бұрын

Solution: shift into reverse

@NathanaelNaused

3 жыл бұрын

That's unfortunate and I know what you mean.

@tloecoep2086

3 жыл бұрын

@@doogetube6017 nice

@gophop

3 жыл бұрын

trucks also have very heavy flywheels because it helps with take-off when towing or offroading.

Finally know why shifting into second takes so long.

@ianswitzer2915

3 жыл бұрын

Also adding trickyness to the 1-2 shift is the fact that it’s also the largest gap and the revs have to drop the most. The gap is smaller for every successive shift, making rev hang less and less of an issue. Unless you drive a semi. Each of the 18 gears has exactly the same space. You learn a rhythm and shifting a breeze. Most truckers only use the clutch to launch, and then shift every other gear without clutching. But that’s a whole other video ...

@Stasiek_Zabojca

3 жыл бұрын

@@ianswitzer2915 I heard about shifting without clutch in semi trucks in America, but never heard about it in Europe. My dad who is a trucker here in Europe never heard about it. I think that a lot comes out of European truck's being made differently. But my dad now is happy, that he drives Volvo with new automated gearbox =) Btw, clutchless shifting is very popular in motorcycles. Especially if you are more kind of sporty rider. Even without quickshifters, which cut ignition while doing gearchange (and that lovely bang when fuel get's burned in exhaust).

@Kalvinjj

3 жыл бұрын

@@Stasiek_Zabojca if I recall, some (or many?) bike transmissions actually use dogs to engage the gears instead of the smaller teeth from synchronized gearboxes from most cars, so it happens easier. Those 18 gear 'murrican semis are a beast of their own too, they don't have synchros from what I know, 6 gears on each normal, high and low, pneumatic assisted. I remember asking some truck driver how it is that he operates them, from what I remember he said pretty often he skips quite many of those gears or the entire section (low, normal or high) and so on, or just wack the shifter to the side, and the air assist shifts to the next gear. It's also common to grind gears sometimes on those, no matter how experienced.

@nicostenfors5690

3 жыл бұрын

@@Stasiek_Zabojca Clutchless shifting WAS common in Europe back in the day when manual trucks were the only option. Synchronized transmissions were introduces quite early into trucks in Europe but the legendary Eaton-Fuller is not synchronized and requires clutchless shifting to work properly.

@k5guy

3 жыл бұрын

@@Kalvinjj Every bike uses dogs. Basically all sequential transmissions are dog boxes.

Oh wow, very deeply explained The way you explained and the study you did on this is much appreciated 👏👏 Thank you brother 👍😊

I love your videos, I have a vortex super charger on a 2013 Mustang 5.0 automatic. I recently installed this module From Hikeit with plugs into The gas pedal connector and Can program different throttle Curves. The difference was dramatic and this video was do helpfull

The Geo Metro was magnificent in its simplicity

@MarkOrkenyi

3 жыл бұрын

That is the one main thing i miss about my old Suzuki Swift..(same as the Metro there) :( That throttle feel/response is whats missing from every other car i've driven...

@joesdiy4260

3 жыл бұрын

I had 3-cyl metro with a 5speed. I absolutely love and miss that car.

@MarkOrkenyi

3 жыл бұрын

@@joesdiy4260 Imagine that with the 1.3 86hp version.. For it's 850kg :))

@MalcolmCir

3 жыл бұрын

...And got Hybrid-beating gas mileage, back in the early '90s. Incidentally, the only speeding ticket I ever got during that era was from flying downhill in a borrowed maroon 3-cylinder Geo Metro. 😁 You had to have driven one to understand.

and i thought my car was broken, that clears things up

@ariasdad

3 жыл бұрын

Me too!

@BlackPhillip666

3 жыл бұрын

MAP OTS tune with a Cobb access point eliminated my rev hang, gave more power, and no lift to shift for my WRX. Best 600 bucks I've ever spent.

4:08 I agree with the statement. That is the cleanest engine bay I have ever seen

Hello ! ..My Micra have an électronic throttle and i was have always questionning what for the engine don't slowing down as fast as i slack the throttle pedal !! Now i know!! Very informative!! Merci!

all this "smoothing" the ECU does leads to the driver instinctively counter those effect with harsher throttle control, defeating at least partially the purpouse. :)

@tiger12506

3 жыл бұрын

100% real

@JasonW.

3 жыл бұрын

Airbus had this problem with early fly by wire and pilots over adjusting controls due to the lag between pilot inputs and airplane adjustments.

@kristupasantanavicius9093

3 жыл бұрын

I'm always flooring my manual and shifting low RPM, just so I can shift swiftly and smoothly O_O

@CesarMartinez-wi7wc

3 жыл бұрын

Yes

@wigletron2846

3 жыл бұрын

Yep

0:00 Oh my lord... graphs.. such beautiful beautiful graphs. this. this right here's is the reason I come to this channel.

I bought just recently a Focus from 2020 having driven a Punto from 95 and I always felt that jerkiness while driving my new car. Thought I was the only one. What I found out was that I have to hold the clutch slighty for about a second before fulling releasing it, and that probably gives time f or the revs to go down. However, if I'm pushing the throttle and going faster I can change gears faster. Makes 100% sense on what you said, very informative!

Excellent explanation ! Years ago, carburetor dashpots were a crude attempt to accomplish the same thing - with the same Rev hanging problem. I have a cable connected to my gas peddle and I do NOT treat it like an on/off switch, though I'm certain I'm not as clean as a modern microprocessor - you'll have to pry cold dead hand off the shift lever on my 1996 GSR

Excellent explanation. Bought my first brand new car in '98 and within a few months my shifts were buttery smooth and my r/t at the track was consistently

I noticed this happening when I first started driving. I developed the habit of letting off the throttle before I disengage the clutch. Haven't experienced it anymore Edit: or well, not perceiving it.

@SketchRC

3 жыл бұрын

Yeah I feel like if you own a car then you get used to it and it’s not a huge issue, I wonder if he just notices it because he’s reviewing different cars all the time?

@theydidntnameme

3 жыл бұрын

I've noticed this with rental cars. Throttle flat on the floor, then let off the throttle completely and... The car still seems to be accelerating for a moment or two

@rurruth

3 жыл бұрын

@@theydidntnameme put in sport mode, this enable the accelerator to react in a sharp mode, but normal driving consume less fuel because of these slow operation that discard some unwanted oscillations that our foot create (i.e. his mass and pot holes or uneven road)

@ariv8585

3 жыл бұрын

I did this also.

@Redpsyclone

3 жыл бұрын

Drove a 2008 manual with electric throttle for 9 years. This is exactly how I defeated the issue. Fuel deceleration cut off

Great explanation! Between you and Driving4Answers my knowledge on how cara with have been greatly improved, I can now make informed decisions on things I should do to improve -- and extend the longevity -- of my car!

This is a great clip! Would be great to see your thoughts on a diesel in the same situation. Am aware of things like lag etc. Residual boost, common rail and no air restriction. Plenty of diesels have over Rev when changing gears!

Thank you for solving a very heated debate between myself and 2 other senior techs at work. You've made me one very happy man.

@lessevdoolbretsim

3 жыл бұрын

But just think of how sad those 2 senior techs are now.

@rogrwi1co

3 жыл бұрын

They’ve probably never driven manuals. Lol, jk.

still haven’t decided if he looks more like a 23 or 46 year old yet.

@RWoody1995

3 жыл бұрын

he is a 46 year old 23 year old.

@babis8142

3 жыл бұрын

his skin is super smooth for a 46 year old so he's probably much younger than that.

@TheCostantinus

3 жыл бұрын

Yes

@ChrisHuppey

3 жыл бұрын

He is like Tony Hawk. An old young adult. :)

@tostadorafuriosa69

3 жыл бұрын

isnt he like 30?

You’re really good at these things bro please continue 🔥🔥

Great explanation, thanks! My 09 Matrix 5 spd has rev hang in spades - it's like my throttle pedal movements are only a suggestion. From dead stop I often over-rev (really trying NOT to) and I'll bet that's chewing into any mileage/emissions calculation. My old Tercel with manual throttle linkage was smooth as silk.

Great video, Jason! Thanks to your videos, I enjoy driving my manual car even more, being aware of what exactly goes on inside the machine while I use my hands and feet. Great to know you enjoy manuals too. Pity they're going away so rapidly. The way you explain complex engineering concepts and devices is just amazing fun to watch and easy to follow. Keep it up! Cheers, Govind

Thanks for the lesson once again! This is a big problem in my '19 Mustang GT when I'm on track. Imagine trying to shift into 4th at 110 mph and having to wait for the revs to slowly creep down from red line :(

@iamezza

3 жыл бұрын

If your doing track days you should look at getting a tune to fix that

@SenorBolsa

3 жыл бұрын

Tunes usually change this behavior, or an experienced tuner can do it without much fuss if that's the only thing you want changed.

@sergeysmelnik

3 жыл бұрын

I had a 2015 mustang gt. Just get a tune, Id do e85 or flex tune if its in your area and simply ask to remove the rev hang. I think some tuners leave it in because some people like it like inexperienced drivers. It was always known the 1 to 2 shift always made the car jerk unless at red line so people just got the rev hang removed with the tunes.

Well explained. Thank you. I've learn something on my car.

I wish I found this video like 2 years ago. I had this question and no answer I got quite made sense but this explained it perfectly! Once again, thank you Jason

The other way electronic throttles can improve efficiency with an automatic transmission is running the engine wide open in a higher gear, but still having pedal travel left to demand a downshift.

@jamessilly6837

3 жыл бұрын

Gas pedal down until you feel it's about to shift, get off the gas a little as it shifts, push the pedal down a little after the shift and instead of dropping rpm with the shift and slowly crawling back up you get a nice shift and then Rev back up quickly. Love that feeling in a moderate to low horsepower car just getting up to speed. Smiles per gallon haha

@averyalexander2303

3 жыл бұрын

That's true, reduced pumping losses.

@roflchopter11

3 жыл бұрын

@@averyalexander2303 Don't forget reduced frictional losses and accessory parasitic (hydraulic power steering, AC, iron losses in the alternator, belt, etc.) from reduced revs.

@MeatPopsicl

3 жыл бұрын

My V6 Tacoma: **Climbing a hill, losing speed** Don't worry, fren. We can lug up this hill in 6th gear. Me: **Applies 6% more throttle** My V6 Tacoma: Oh, I see you're asking for a tiny bit more torque. **DOWNSHIFTS TO 3RD, ENGINE SCREAMS!!**

@PushyPawn

3 жыл бұрын

20 Years or so ago and earlier, this function was served by a simple button/switch behind the gas pedal. The end of pedal travel matched full throttle but if pushed harder this would press that button signalling the auto trans to downshift.

Fuel not burning off when you let off the throttle to change gears? Flat foot shift. Boom. Fixed your problem.

really really detailed explaination... great

My 2016 Kia ceed direct injection had terrible rev hang and hated it for it. I always thought it was due to the flywheel, so thanks for the very informative video!

Some: MECHANICAL!!! Others: ELECTRONIC!! BMW: ValveTronic!

@mojeimja

3 жыл бұрын

...in service as usual :)

@RonniePoleCasper

3 жыл бұрын

Audi, mechatronic Bi*ch

@timothyball3144

3 жыл бұрын

Diesel: fuel throttled

@an0nim11

3 жыл бұрын

@@timothyball3144 btw i heard somewhere even some diesels still have something alike throttle body and it wasn't meant as intake flaps probably but im not really sure. Somebody knows something about it?

@samehezzzat

3 жыл бұрын

an0nim11 may be used for inducing some engine brake during the downhills.

This explained why my timing was off shifting a Manual Transmission.

@Ijusthopeitsquick

3 жыл бұрын

To be fair, it's only one of several possible explanations :-)

@rogrwi1co

3 жыл бұрын

I compensate for rev hang by shifting as if I’m starting off from first gear at any gear change. Don’t step on the gas until you’re at the clutch bite point. Gone are the days where you have that see saw step of the clutch and gas pedal.

@LorenzoManiglia

3 жыл бұрын

@@rogrwi1co me too.. have been shifting like that ever since i got a car that hangs.. i'll have to say that it works, but surely impacts the clutch / mechanics wear.. Shifting lke i would do in any car that doesn't hang, would result in an undriveable experience.

Thank you very much for the video. I was studying to replace my 2011 Chevrolet Celta flywheel to a lighter one thinking it was heavy and causing the rev hang that were really annoying me because I was thinking I was changing gears so fast that I had to keep pressing the clutch until it dropped RPM to stop unmatched gear shifts.

"Can remove driving jerk..." *shows himself driving*

Simple fix for rev-hang: install a tune. Installing Hondata's on my 2020 Civic Si completely changed the shifting experience.

@GregBalzer

3 жыл бұрын

Yeah. The rev-hang on my Si is horrible. Just horrible. Shouldn’t need to go aftermarket to fix - but it is what it is.

@frankb3609

3 жыл бұрын

@@GregBalzer Same was with mine. But after installing the tune, it's a completely different car and the gearbox is among the finest you can get. Getting rid of the rev hand alone made the tune worth it, the added torque and horsepower available once you press the sport button, a VERY nice bonus.

@akihiko4036

3 жыл бұрын

Same with my '06... the hang at 8300 was about a second long after you push the clutch in before I got a tune and it would rock back and forth

@mgobluevictor

3 жыл бұрын

Someday I will go down this path on my 2018 accord 2.0T with the 6MT. Rev hang sucks on this car, but I love every other aspect of it. I find that driving with AC on helps a bit, but with AC off it is awful.

@alanprihoda7772

3 жыл бұрын

I was wondering if a tune could help this. Might it cause problems during emissions testing?

My '09 Ford fusion had some severe rev hang. I found the trick to driving an etb is letting up on the accelerator as you're beginning to reach your shift point (don't let up at the shift point), so your acceleration will decrease slightly, then shift and voilà it's smooth a silk. Takes some practice, but smooth shifts can be done if you're not wanting to gun it everytime you take off. 🕉️

@gronki1

3 жыл бұрын

same in my vw polo. need to push and release the gas pedal a split second earlier that i would normally.

@valiant7802

3 жыл бұрын

I drive a 06 Ford Fusion, I’ll have to try this on mine. Maybe it’ll help 🤷🏽‍♂️

@aaronhorn6849

3 жыл бұрын

The way i handle it is to half way float the up shift gear change. As you reach the shift point let off the throttle, as the gearbox unloads hold light presure on the gear lever and as it slips out of gear press the clutch and change into the new gear in one motion. Takes a little practice but very smooth and a little quicker.

That was a super clean explanation. Thanks!

1) Yet another excellent presentation. I am an engineer myself and I always learn a ton of new things from your videos. Thank you, sir! 2) 11:38 Literally laughed out loud at the 'Super Clean' written in the dirt build-up. ;o)

What we need is for the clutch being pressed in to act like engine “neutral” and match the rpm on either side of the clutch, then when you shift the gearbox and there’s a surge up or down in clutch disk speed, the engine speed will follow it, if you had this and a power assist clutch with really strong springs, you may never need to replace the clutch other than when the springs wear

@nocturnal101ravenous6

3 жыл бұрын

There have been better systems implemented that don't use a clutch. Its cheaper for the manufacturer and more expensive for you as they are wearable parts which is why the clutch disc/clamp/bearing system is still used today. Audi developed a torsion manual system similar to how the AWD couplers work, its way more expensive and way more complex being scaled up and requires a bit more maint. than people are used to for a trans. the closest thing I have seen using a system similar is the Car(forget the name of it) with the TFG engine coupled with the electric motor, but typically you only see these high end designs in some Super cars but mainly Hyper cars like Mclaren and such that don't use conventional means of building a car.

@parman01

3 жыл бұрын

Mate what you're describing here is literally called rev matching and racing drivers do it all the time. You may too if you desire.

@BigUriel

3 жыл бұрын

@@parman01 Some cars have it. I think the Nissan 370Z was one of the first ones with it. I think it's a lot of fuss over nothing. Yes some cars are a little lazier dropping revs but when you release the clutch they'll always go where you want them to, if it causes a jerk simply release the clutch more smoothly. These are not usually "sporty" cars anyway, why would you be shifting gears in an SUV as you would in a sports car? It's clearly not the right car for that kind of driving style, the rev hang is the least of it.

@mikegordon8178

2 жыл бұрын

dual clutch/at input and output of transmission.

@aterack833

2 жыл бұрын

@@parman01 I think I was talking about automatically? I honestly can’t figure out my comment here

Has anyone noticed how clean the engine . I mean he wrote "super clean " 4:07.

@sebastianalvarado2390

3 жыл бұрын

Had to make sure I wasn’t the only one lol

Excellent explanation. I’ve wondered for a while about this on my 11 Camry.

As the owner of a 2021 6.4L Hemi (all modern Hemi engines port-injected) Challenger with 6-spd manual, I appreciate this explanation very much! It explains the weird behavior on shifting that I noticed every since I bought the car. (All my previous manual-trans vehicles had mechanical throttle body.)