Those 8.1/Allison models bring stupid money now if in good shape. I remember during the surge in gas prices leading up to the crash in 2008, you could barely give those trucks away. 06 model years sat on dealers lots even with 30+% off MSRP.

@nickpriegnitz5895

3 ай бұрын

Ironic considering the 06 8.1 is probably the holy grail of that configuration for anybody with their heart set on one of these rigs.

@michaelbenoit248

3 ай бұрын

Probably because guys that know what Diesel maintenance costs guys are going for the gasser, & if they can get one with the Allison ofc it’s a good combo. Mostly because the Duramax has the Killer crank pin and when it fails the motor is 100% destroyed.

@workingcountry1776

3 ай бұрын

3.50/ gallon gas and 10mpg empty. These are cheapest Silverados you can buy

@KS-dg5zh

3 ай бұрын

​@@nickpriegnitz5895yes they have the 6spd allison with gave it smidge more gas mileage. There is a conversion kit available to make earlier allison a 6speed .valvebody and computer upgrade.i have a 02 2500hd with the 3.73 and 265 75 16 tires and have gotten 14 mpg average about 72 mph.go over that it dropped. I think it would pick up about 1.5 to 2 with a 6 spd

@KS-dg5zh

3 ай бұрын

​@@nickpriegnitz5895 I forgot to mention the allison has the 6 spd hardware all ready in early models gm didn't want to have 2 overdrive at the time

I currently own 3 GM vehicles from this generation: A 2005 Suburban 2500HD (8.1), a 2002 Silverado 1500, and - the crown jewel - a 2004 Hummer H2 Luxury package. I bought the Suburban with 110k miles (it currently has 210k), the Silverado with 137k (it currently has 179k), and the Hummer with 53k (it currently has 79k). I daily drive all three, and have done many long-distance road trips and family outings in both the Suburban and the Hummer. I occasionally tow with all three (nothing very heavy), and have done a fair amount of light off-roading with the Suburban and the Hummer. I used to have a 2003 Suburban 1500. I gave it to my daughter with 275k miles on it. It currently has 300k miles, and she is still driving it. These four vehicles have proven to be the toughest, and most reliable vehicles I have ever owned by FAR, in my total 35-ish years of vehicle ownership. In the case of the Suburban's specifically, also the most versatile and useful. GM really knocked it out of the park in the early 2000's.

@Duramaxtuner

13 күн бұрын

They really did. Thanks for sharing that, always love hearing these types of things.

I miss my 8.1 cab/chassis. Order it in November of 2000. It passed everything but a gas station. Loved it.

@karlwahlfield6462

3 ай бұрын

same here lol thats so weird

I don't know how people can afford current diesel trucks for personal use. The truck prices are way too high. When the warranty expires the emission replacement or other components are very expensive. Rather, spend a little extra at the pump for gas or get an older diesel truck. Another great video Nick.

@jacksonreid6412

3 ай бұрын

My LMM is about the newest truck I would buy. The newer ones scare the hell out of me

@josephdemarco1469

3 ай бұрын

I just bought an LB7 because I thought I was going to have to move across the country for work. A Uhaul truck and trailer cost me $6500...this truck cost me $8k after I sold my old vehicle. its very good on diesel. 6-700km/ 450miles/tank with some mixed highway/city driving. whats hurting me is the outrageous cost of diesel in Canada, which is very new for us since diesel has always been less than a $1/liter and is not $1.65/liter. mine is pre-emissions so I never have to worry about that garbage.

@TheElderOne2003

3 ай бұрын

I drive a 22 Ram 2500 6.7L CCLB as my DD. Honestly, about a wash on cost 6:40 older Ram 2500 6.4L Hemi. Yes, the oil change is a bit more, but I get around 10K per change, plus I do labs on the oil, each oil change with plenty of life left in it. Mpg is a bunch better in my new truck vs the old one DD & towing. Here is an extra cost ~$100 for fuel filters every 10K with the oil change. Granted, if something fails on a diesel like an injector, it does cost more, but the money saved on fuel, I'm not worried about it. Plus damn does my truck love to tow heavy loads like a champ!

@StarHunter28

3 ай бұрын

I don't buy anything with Obama emissions. 07 and under for me

Keep going with the big block,Throw an exhaust,cold air intake and a throttle body on it. Those things were sweet trucks. Use an lb7 4 inch with a muffler and make a y pipe to hook into it. They sound pretty rowdy set that way.

@nickpriegnitz5895

3 ай бұрын

I like where your heads at Daniel 👌

@christophermix6845

2 ай бұрын

Definitely would like to see headers and a straight muffler. Even if the power gain isn't that high, the drivability would be completely different. Gas trucks are slugs with the crappy stock exhaust.

My 05 8.1/Allison K3500 is a beast for towing a 15K 5th wheel. Gas mileage is always consistent. Having emerged from the diesel rabbit hole I couldn’t have been happier when I ran across this one from its previous single owner. It’s close to 290K with an unadulterated drive train. I’ve tried different tunes for both power and fuel mileage but am happiest with performance running the stock tune.

I have a 2003 GMC 8.1 Allison regular cab long bed with 65,000 original miles. That is a fun ride.

@Duramaxtuner

3 ай бұрын

Love it!

A few years back, I bought a 2001 Chevy 3500DRW with the 8.1/Allison. It has a Whipple supercharger/intercooler setup on it and 71k miles. I had no idea the timing was locked at 15 degrees. It's no wonder that even with the blower and 4.10 gears, that truck just doesn't feel fast. My stock LBZ feels like a monster by comparison. The Whipple kit is an early design with a piggy-back computer - they did not include a new tune for the PCM. They didn't even upgrade the fuel injectors! There are two giant injectors mounted in front of the throttle body that just blast fuel in front of the throttle plate under boost conditions. Watching this N/A truck totally wake up makes me realize, I've gotta get mine tuned. It'll probably run cooler too. 15 degrees under boost is ridiculous. I wish I was closer to your shop!

@nickpriegnitz5895

3 ай бұрын

Your truck would be an ideal candidate for E85 and a real tune. You'd probably pick up 80HP or more all while improving engine efficiency across the board.

@toddthezondalover645

3 ай бұрын

Running boost w a bad tune can turn into damage quickly. Good thing yours is low mile

@Duramaxtuner

3 ай бұрын

Nick's got you in the comments!

This will be a good series Nick! Looking forward to more. Love both these motors and both have their place. Glad to see another diesel guy that likes the older big block gas motors too. 🤘

I bought a 2001 gmc Yukon xl with the 8.1 and she’s still running strong

I have a 2003 8.1L with the 6 speed manual. That thing is a blast to drive.

@Duramaxtuner

2 ай бұрын

They are fun for sure!

I just spent a TON on a complete frame swap/frame off restoration of my 2001 HD Reg Cab. I just love the truck. Bought it new. I'll never get my money out of it, but that was not the point.

@nickpriegnitz5895

3 ай бұрын

These are the next ‘square body’. You’re just ahead of the curve.

@curtisstivason3695

3 ай бұрын

Enjoy your truck

They are gaining popularity. They are great trucks

Nice test buddy!

i have one in a utilty truck, never tuned it but when the tranny went we did the massive cooler, higher stall convrter and shift kit and that really makes it tow nice!

Great video! Awesome comparison

@Duramaxtuner

2 ай бұрын

Glad you enjoyed it

In 2001 I bought my 2500 Chevy Dually service truck with 11 foot utility bed & drove the snot outta it for company business. I can vouch for that 8-10 mpg first hand here . Was NOT cheap to fuel up each week , but I used to joke at how well it toted around almost 13,000 pounds of total weight on a daily basis & could probably rotate the world a couple feet if a hitch could somehow be attached behind it to the ground. In 2003 I bought my 2002 LB-7 2500 Crew cab GMC Sierra & with the diesel noticed an immediate gain in fuel efficiency, using that truck to haul around our 30 foot Toy- hauler trailer ( maxed out fully loaded at almost 14,000 pounds) of anywhere from 14 to 18 mpg after I made the usual intake & exhaust mods ( K&N filter in stock air box & 4” stainless steel exhaust down pipe back )along with a 6-gun tuner from Mr.Gale Banks . Unfortunately my service truck met an early demise in 2017 due to a pot head girl who blew through a stop sign at around 45 mph almost hitting me square in the left front wheel & sending me 18 feet sideways through an intersection ( by the Grace of God neither of us was seriously injured , but I sure wanted to injure her dumb ass), and that truck got totaled . We still own the ‘02 GMC, and watch your videos all the time Nick , and truly enjoyed this one here as it brought back some good memories of my “ White -Whale “ service truck . From Sunny So.Cal , THANKS !!😎👍

I remember riding in a an 8.1 01. That thing was awesome. Light then 35 in tires right up.

Time to take them to the truck pull this summer and see what they each do with a sled, or hook equal weight trailers and go on a real world road test and see how they perform

@michaelbenoit248

3 ай бұрын

The Diesel would probably win except for EGTs cuz all they’re doing is more fueling that slowly kills diesels. More fuel means more heat, & needs more air or methanol to be cooler, or a turbo which means studs, & now it’s a whole ordeal to do it right.

@TermiteBenny

3 ай бұрын

@@michaelbenoit248 I have no doubt the diesel would win, it would be fun to see how far apart they would be under real world conditions. On the dyno they were close so would like to see if that stays that way on the street or if the gap gets larger.

Loved my 8.1. If they brought that motor back with an 8 speed and a 50 gallon gas tank. I'd buy one in a heart beat

Awesome comparison brother!!! Well done!!!!

@Duramaxtuner

13 күн бұрын

Thanks for watching!

This was a cool test. I always thought the 8.1 is super cool. Sometimes my duramax gets annoying with it’s complexity

I own an 8.1Yukon XL, an LBZ 3500 and a L5P dually. I love them all but I have the most fun with my 8.1!

I’d like to see you throw a turbo on the big block 🎉

I would LOVE to have an 8.1 truck. These 8.1/Allison trucks are UNICORNS. Ive literally NEVER seen one irl out in the wild. That big gasser would be perfect for my uses. I dont tow or haul super heavy often enough to justify a diesel. Most diesel guys never even get close to working it as hard or as often to justify the added updront cost of the diesel not to mention the expensive maintenance costs and (nowadays) DEF fluid and system maintenance and repairs. If i could find a clean 8.1 Allison truck id buy it IMMEDIATELY.

@StarHunter28

3 ай бұрын

That's why you buy a pre emissions diesel, barely more expensive than a gasser to run

@Duramaxtuner

3 ай бұрын

We get it.

@user-je7gd9sr7o

2 ай бұрын

@@StarHunter28🤣🤣🤣 barely…I’ve never had to pull the cab or spend $10k on injectors or had to do a head gasket job.

@jellyfrosh9102

13 күн бұрын

@@user-je7gd9sr7o It's a good thing injectors don't cost 10k then.

@jonkobler1637

12 күн бұрын

RU near KC?

Good comparison! Toss a bigger throttle body on it and strap it back on the rollers

Love the old 8.1's. My dad purchased one brand new back in 2002 i think, still has it sitting in the shop with over 200k on it. Only ever had brake changes fluids and a crank sensor, otherwise its all original. Spent most its life pulling a 9,000lb camper all over the US.

@Duramaxtuner

3 ай бұрын

Love it, thanks for sharing.

Nice Truck, & Good Teaser video! I'll be waiting for round 2 & more! GMT800 series truck's and SUVs are my favorite body style and drivetrains. I was looking for a used 8.1 2500hd ccsb about 10 years ago. There were few to choose from once you whittled out 6.0 gas & Duramax trucks. So after a year + of research and shopping around I bought my LBZ and haven't looked back! So much so, I'll be selling my 1984 Big block Blazer & Jeep Cj-7 to make room for another LBZ... or maybe... 8.1 if I can find the right one!

@StarHunter28

3 ай бұрын

LBZs are amazing

Great video. I run the smaller 7.4 bbc and at the end of the day big block is always fun to run

@Duramaxtuner

2 ай бұрын

She really is.

Awesome video nick

@Duramaxtuner

3 ай бұрын

Thanks!

I have 04 8.1 Alli combo with 4.56s a flat bed and all kryptonite front end goodies. 175k miles 2nd owner bought with 42k miles 10 plus years ago love it. Intake is the issue according to Raylar.

Great video!! Let’s do a towing comparison.

I had a 8.1 back in the day and that truck was a beast! I miss it every day. Only reason I got rid of it was the shit fuel milage for all the driving I was doing.

@Duramaxtuner

2 ай бұрын

Such a fun truck!

Have a 2002 2500hd with8..1 Allison combo.now has 445 thousand miles original motor just maintenance

I currently own a 2001 2500HD with the 8.1L/Allison combo. Did a street tune a couple tests ago. No dyno. Gained approx 10mph on steep grades while towing my 24’ enclosed trailer with my Jeep and all of our gear in it. Noticeable improvement without the trailer as well. Love that engine! Not goods lie about mileage. It sucks. But I get the same mileage as many others I’ve owned while towing and have a ton more power.

@rracerguy

2 ай бұрын

I had TBI 7.4L with 4L80E in 32' RV. only mod i did was take the tail pipe and exit it b4 the rear tire and it gain 5-10mph climbing hills Night and Day difference. I would bet if you did that you would pu another 5mph IMO

@timryan8174

2 ай бұрын

@@rracerguy My exhaust is still bone stock. I do need to address that.

@Duramaxtuner

2 ай бұрын

Thanks for the comment!

8.1 getting light again.. LT, Richard, now you.. let’s see a turbo build up head to head. Real world conditions.. towing, round town.. that’d be interesting. Awesome content, keep up the good work

@nickpriegnitz5895

3 ай бұрын

I need to have LT build me a turbo setup like his. Nobody makes a kit...ugh.

@Duramaxtuner

3 ай бұрын

👍 Thanks!

I’ve ALWAYS wondered what this answer was 👍🏿👍🏿

@Duramaxtuner

3 ай бұрын

🫡

Would like to see the torque curve differences in the two trucks. Or rear wheel torque vs ground speed to get an idea of how well the two would tow since it is a Mustang Dyno. I have a mix of Ford V10 gassers, a 7.3 international, Cat 7.2 Freightliner and a 7.6 International all medium size F450 to international 4700s. The gassers are louder cause they rev higher to do the same work, but they still get the job done. I like the diesels and they do pull better, but its not by much. More depends on the gearing in the trans/rearend than the engine. For local trucks or occasional long hauls i would go gas if i could. Had to inframe our 7.6 due to a leaky liner seal. That was 10k dollars, which would have easily bought a reman 8.1 or two. But for consistent long haul highway use diesel is the way to go.

Having owned 4 duramax trucks I love 8.1's they are nutered from the factory they have a lot of potential although very little aftermarket support

@kevinkalivoda3442

3 ай бұрын

The big name in performance parts for the 8.1 is Raylar. Pricy stuff but I think the only company making aluminum heads for the old 496

@nickpriegnitz5895

3 ай бұрын

Yeah, I’d love to add a set of heads to this truck and I would have if they cost what regular aluminum big block Chevy heads cost, but the Raylar stuff is extra spicy

You do actually need the cam and intake for that power . A tune on average on these is only good for maybe 25hp and 30 to 40 foot pounds . You picked up almost double that because of the cam and intake . Mild flow job on the head , headers and a larger throttle body and you would have seen over 500 foot pounds at the crank

I have an '01 bone stock GMC 2500 with the 8.1 Allison. Hooked up a tug a war with a Ford 3500 dually with 7.3; I drug his ass. Love my 8.1. Mileage is 9 MPH whether with a loaded trailer or not.

@Duramaxtuner

2 ай бұрын

Oh hell yeah!

After 100's x 1,000's of miles of gas and diesels.. the LB7 is still a soft spot as a work truck in my heart. If it was 2003 and we were pulling... not a chance. Only took ~10 yrs after that for Ford to copy it. Cummins eventually showed up. In any regard... gassers have a place, but for mileage and pulling for any length of time, no comparison.

@Duramaxtuner

3 ай бұрын

Amen.

I love my 02 LB7 truck, and it feels very quick with your guys 5 position switch, but I also love big block gas trucks too! This is a great series to go on. Raylar(I believe is the name) makes some very bad ass parts for 8.1l engines. I still think the LB7 will edge out the 8.1l for heavy towing and sled pulling.

@Duramaxtuner

3 ай бұрын

Thanks for the comment, we will check Raylar

I want some tunes for my 8.1!

I have 296k on my 2002 8.1 with allison crew cab. Has some drips and marks the territory but I haul 2 atv with a rack and a 30ft camper with it. Not as roomy as my 2015 dmax was or as fast up hill. No Def, no bull crap exhaust emissions and nonextra costs have added up to more fun times. Besides for 13k you can get on of these with lower milage and they run forever.

@StarHunter28

3 ай бұрын

That's what I love about my lbz, 400k miles, 17 mpg average, no emissions

That was a fun video! LB7 all day baby 🍻

@Duramaxtuner

2 ай бұрын

Thank you!

Should build this truck and see what you can get out of it

Cam intake and headers really wakes em up

@nickpriegnitz5895

3 ай бұрын

Yeah, there's clearly more power on the table in the 8.1. We'll get there eventually. ;)

My dad had a single cab 2004 3500 with the 8.1. Got 9mpg empty and 9mpg with the gooseneck hooked up. 😂

@Duramaxtuner

3 ай бұрын

Consistency!

Great truck for local work here in hills of NY. 10mpg empty vs 12 with 6.0 is kind of obvious choice. These are SLOW stock compared to 6.8L Ford in medium duty trucks I've driven for work back a while. The ferd had torque everywhere in rpm range and would merge w/ traffic w/ load about same effort as the 8.1 empty. I wonder if part was gm tuning....

@Duramaxtuner

3 ай бұрын

For sure.

I just sold my 2002 8.1L after years of 100% trouble free driving. $40 oil changes and nothing else. If they put one in a newer truck that was rated for my camper+trailer combo I would buy it with little hesitation.

@bigmurph1447

3 ай бұрын

The 6.6l is rated to pull more than the 8.1l the 6.6 is more hp and tq that's the 6.6l gas

@blknblubkrdude

3 ай бұрын

@bigmurph1447 GM dropped the ball with axle ratios on the new ones. I got to drive my coworkers '23 High Country pulling a 24' wake boat and although the 10spd is great the tall axle ratio just doesn't give the grunt an 8.1/6spd allison/4.10 gears does. At this current time, the Ford 7.3/10spd/4.30 gears is the go-to for gasoline. I ended up with a '21 drw L5P Denali because it literally cost less than an equivalent gas Ford 🤣

@bigmurph1447

3 ай бұрын

@@blknblubkrdude tall gear ratio? It has 3.73. The duramax has 3.42. I have a 2024 with 6.6l gas and mine works great. I have pulled 18000lbs with it and it did very well.

@jasondecker9196

3 ай бұрын

I went with the 8.1. Buying an older higher mileage truck, the ease of repair made my decision. 02 ccsb with 160k. Runs great. I want to tune it though.

@Icutmetal

3 ай бұрын

@@bigmurph1447Apples and oranges, c’mon.

Would you guys be interested in seeing more power from the 8.1? I would for sure.

That 8.1 is a clean truck!

@Duramaxtuner

2 ай бұрын

Ain't she?

I do love the 8.1 but where I live 87 cost $3.25 and diesel is only $3.56 a gallon. Diesel and gas have been that close in parody for several years. That was one of the biggest reasons I sold my gas truck and bought a diesel. My LLY with tune gets 23 on the highway on 35s and my gas truck got 13 on the highway on 33s. Both of them toe fantastic but I prefer the power delivery of the diesel now that I’ve had one. Maybe a hot take but I would choose an eight point one before I got a 6.0.

@Steven-gv1ke

3 ай бұрын

Yeah but when you factor in the additional $10,000 for the diesel upgrade, that's a LOT of extra gas you could buy. This doesn't include the extra money you save in oil changes and everything else as well. There have been many people documenting this very well and it takes basically over 10 years to recoup that additional cost of a diesel. Most people don't keep their trucks for over 10 years. There was even a fleet manager who made a video on this topic. He ran a 500 truck fleet. He had 250 gas and 250 diesel for 10 years. He has every last receipt for everything and after 10 years, went over all them. He ended up swapping the entire fleet to gas because it was cheaper. Now to be fair, their company wasn't towing 10,000 lb plus loads. They were mainly used as mechanic trucks with heavy tool boxes in bed along with heavy loads.

@zakswindle

3 ай бұрын

@@Steven-gv1ke I know I left a lot of information out as to why I made my decision on a diesel. First off, I think the 6.0 gas trucks are your best bang for buck if you’re not on the upper limits. The 1500 HD and 2500 with that power plant is the best crossover of cost of maintenance reliability, power output and capability. I am explicitly talking about the 8.1 versus the Duramax. My 8.1 had an Allison transmission, when doing maintenance the only thing that was different was the price of the engine oil. Maintaining the transmission, the brakes, differentials and the transfer case the cost was essentially the same. I only got into trucks this big because the nature of my work. I do repairs on water, so I am pulling a workshop on a boat. Daily I was close to that 10,000 pound trailer weight. While towing the Duramax frequently got between 12 and 15 miles per gallon and the 8.1 frequently average 6 to 8 miles per gallon. For both of these trucks I bought them used and I got the 8.1 for $6800 and I got my Duramax for $7500. Trim wise the Duramax has leather electric seats and the center consul where the 8.1 had cloth mechanical seats and a jump seat. Both trucks are very capable and I will admit the 8.1 was substantially easier to work on. For me the diesel feels more natural and I personally like it. At this point, I have owned every engine combination you can get in a GMT 800. If you’re not towing at the limit or you do not just prefer the diesel I always recommend the 1500 HD or the 2500 6.0.

@Duramaxtuner

3 ай бұрын

Totally understand.

Just for laughs I think it needs a little boost. Supercharger! Or a custom turbo kit with a stealth 64 for an lb7 and dyno test!

@nickpriegnitz5895

3 ай бұрын

@wcfab are you listening?

@keelanarn2218

3 ай бұрын

@nickpriegnitz5895 Does a gm 8.1L or an lb7 gain more power with a stealth 64? I think we all need to know! Lol might need pump, injectors, and E85 for that 8.1!

U need to do a 6.6l gas

Had a regular cab 2006 8.1 6 speed Allison. Was a monster to tow with. Would tow better than stock diesels of the day.

@Duramaxtuner

2 ай бұрын

Nice!

I miss my 02 chevy 8.1 crewcab dually 3500

Having owned 2 Diesels mostly the 95 7.3 and my current 1993 IDI a reason why I bought an IDI is because the engine is pretty naked. Mechanical injection, & no turbo. Makes a whopping 185hp with a 5spd behind it. Plenty of toque for me. As for the Duramax they are good engines. Better than the 6.0 BUT the injectors are abt 5-6k for a good set, and a fresh CP3. Also needs a FASS with it, studs, & they also have that crankshaft gear pin that’ll fail out of nowhere & trash ur $10k motor. Could also destroy ur injectors but mainly bends the valves. The fix is to weld the crankshaft gear to the crank so it can’t move or put a keyway instead of 1 pin.

@Duramaxtuner

2 ай бұрын

Thanks for the comment! Appreciate you sharing your experience.

Torque is what 8.1 and duramax are about but won't mentioned 🤷

2006 chevy 6.0 4l80e 268,720 🤌💪💯 8.4 mpg babbyyyy beastin shit daily

@Duramaxtuner

3 ай бұрын

Hell yeah!

You didn’t mention if you tuned out the torque management was reduced or taken out ? That makes quite a difference to how the engine runs also , you are correct on the induction side it starves for air .

@nickpriegnitz5895

3 ай бұрын

Larry, you’re absolutely right. I left that out of the video but I should’ve put it in. I did adjust the torque management settings on the shifts which makes for a much more fun driving experience. 👌

@larrymolina7037

3 ай бұрын

I think you should remove the torque management altogether or cut it down considerably. I own one of these and we removed alot of the torque management and the fuel economy went up by quite a bit plus it was alot more fun driving around town .

@nickpriegnitz5895

3 ай бұрын

True story

What headlights are on the red 8.1 gasser?

I have the exact same 01 GMC HD in red. I really enjoy it. It’s been a good rig for us. Seems to be pretty low on that Dino after the cam swap, was the computer reflated to accommodate the cam swap before all these claims? It’s like a big gain.

@nickpriegnitz5895

3 ай бұрын

The ‘before’ Dyno test was done with the cam and intake installed. 266 is 10-15HP higher than a bone stock 8.1 usually runs. The tune I flashed is in line with what I would normally flash an otherwise stock 8.1 with. 40HP gains with our tune is typical on a stock truck. Seeing the same 40HP gain tuning this truck with the cam and manifold mods seems reasonable but I would’ve expected a few more HP from the cam/manifold alone. That’s life. The fact that manifold air pressure is trailing off as early as 3500 RPM shows that the intake and cam cannot be taken advantage of without upgrading the throttlebody and air intake system. Hope this all makes sense.

@Duramaxtuner

3 ай бұрын

Hope Nick answered your questions, thanks for chiming in!

Opened up my 8.1 for a set of forged 6.385 rods and forged flat top Pistons with a 1.645 compression height. I put on a set of 8.8 heads with stiffer springs and a 8.8 intake. Makes 1 hp per cubic inch and torque is almost 700 ft#'s.

@nickpriegnitz5895

3 ай бұрын

Love the idea of doing a higher compression version. Maybe my E85 plan would pan out better if I put a set of domed pistons and in it and ran 13.5:1

@bladenrexroth2555

3 ай бұрын

@@nickpriegnitz5895 the 8.8 top end kit (heads and intake) alone helps with getting more fuel and air. The throttle body on the intake is much larger and feeds so much more fuel. A set of LS coils, a better fuel pump and a few other odds and end will get you that advertised HP/TQ figure to the wheels. Better Rods and Pistons will get you 1 hp per cubic inch. My Pistons are 0.005 below the deck which let's me use a thinner head gasket. I believe I'm only at 10.8:1 static compression. 13.5:1 would hurt the wallet at the pump. I run mine on E85 but it was a hassle to get it to be efficient. Had to replace the fuel lines, fuel pump and had to replace any part with rubber seal for stainless steel.

@Duramaxtuner

3 ай бұрын

🤘

I watched a video about 5 years back where a guy who was the fleet manager at a company that had 500 trucks, swapped half the fleet from diesel to gas. He ran this setup for 10 years and reviewed all the date. He had every receipt for every piece of maintenance and repair, and the conclusion was they were swapping the entire fleet to gas as it was cheaper. This is also when diesel was only about 10% to 12% more expensive than gas. Now diesel is about 33% more expensive which makes it even less cost effective. The only reason I see to ever run a diesel is if whatever you are towing is not within the specs of what the gas can tow and you MUST have the towing capacity of the diesel to safely do it.

@StarHunter28

3 ай бұрын

I just like being able to go 250 miles between fill ups instead of 125. Out here in the desert you're likely to run out between pumps with range that low

@Duramaxtuner

3 ай бұрын

Interesting, link us to that video if you ever find it.

I’ve had one with turbo n another with nitrous. Great engine they took a lot of abuse.

@Duramaxtuner

2 ай бұрын

Oh hell yeah!

Im still running a 1998 Z71 5.7 K1500 with custom cut high torque comp cam and full 3" dual exhaust no cat 87 octane

@Duramaxtuner

3 ай бұрын

Nice.

My 502 bbc runs great 36 degrees of timing and with Howard’s cams Edelbrock alum marine heads and to get me some more stainless water cooled headers with C&S Specialties 800 cfm holy airasol billet custom built car high dollar car but runs and starts just like a fuelie .

I would open up the exhaust first.

Ive never met a diesel guy that hates the 8.1

@Duramaxtuner

3 ай бұрын

Lucky you!

That GMC looked beautiful

@Duramaxtuner

3 ай бұрын

Right!?

Now add some boost

I am going to be using a rotted out suburban 8.1 but low mileage one as a donor for the my clean 4.3 ill be using the 8.1 and 4l80e/4l85e to replace the failing 4.3 in my truck soon how does the idea of a 496 SS sound to anyone also I have a duramax a zf6 with only 97k on it but the frame is going I gotta try to find a donor frame but both engines are pretty good

It will become nice if have turbocharged on 8.1

I have had a bunch of 8.1 l trucks.I think they are great and you're right.Easy to work on super strong and reliable I have an 05 sierra That I'm trying to get back on the road.I would really love your input right now.I have a b******* tune and a raylar cam.So I know there's much more that I can do or should do so.Any input would be very greatly appreciated .

@Duramaxtuner

3 ай бұрын

Hey, give us a call 815-568-7920

look up the c8 corvette build with a 8.1

Richard Holdener dynoed a 8.1 with a manual throttle body and used holley management .it made over 400 hp and 550 ftpd of torque. Basically took away the torque management that gm has in the factory program.he also put a turbo on in and it made some crazy power and torque. Its on his you tube channel

@northcountryredneck5979

3 ай бұрын

What’s the channel called I’m very interested to see that

@nickpriegnitz5895

3 ай бұрын

I have watched Richard’s stuff. He does a really nice job with his 8.1 series. I can assure you the torque management was not an issue or holding the truck back in any way on the Dyno. The throttle was fully open, and all the time and fuel commands were as requested.

@KS-dg5zh

3 ай бұрын

@@northcountryredneck5979 just type in his name in the search and it will come up.those dyno numbers are from when he had it on westech engine dyno

@KS-dg5zh

3 ай бұрын

@@nickpriegnitz5895 i realize that but what I saw was when the torque management was off the 8.1 was a match to the duramax in torque. And everybody knows when these diesels get around 100,000 they turn into money pits.the 8.1s properly maintained go over 200,000 easily.

@Duramaxtuner

3 ай бұрын

Thanks for the heads up!

GM should make a modern version of the 8.1. I think it would have a place in the market. They just need to add a 50+ gallon gas tank to them.

@workingcountry1776

3 ай бұрын

Ford is using that 7.3L gas push rod engine in their big trucks. Theres videos with a hotshot truck with that engine. Colton Welding i think is the KZread channel showing the 7.3L gas truck

Give that 8.1 8.1 psi and see what she does :)

@Duramaxtuner

3 ай бұрын

🫡

What’s up duramax tuner Can you explain what a p1626 code would be in a 04 lly 2500hd?

@Duramaxtuner

2 ай бұрын

Most likely faulty ECM

I wonder how the TQ numbers and MPG numbers compare when towing?

@Duramaxtuner

3 ай бұрын

6.6L all day.

I've been a diesel engine builder, shop owner for 25 years and will not own a modern diesel.... I at one time I wouldn't own anything but a diesel. I own a 21 7.3 F350 that gets 9-17mpg and will tow and run with most new diesels.

@Duramaxtuner

3 ай бұрын

Interesting!

Any idea what changes to fuel economy the tuning made for the 8.1?

@nickpriegnitz5895

3 ай бұрын

I don’t have strong data on the topic Lee. I did convert this one to a six speed so that helps on the highway. Tuning alone will improve economy but we’re likely talking fractions of an MPG.

@techs1smh13

3 ай бұрын

Drive down hill

Have you thought about some raylar engineering heads for that 8.1?

@Duramaxtuner

2 ай бұрын

Hmmmm.......

Are you able to tweak the torque limiters with the tuner you used? I would like to see a Dino run with the torque limiters turned off. The factory derates based on temps, throttle position, ect can be huge! I tuned my 8.1 personally, didn’t touch timing, really only modified power enrichment slightly and heavy on turning off torque limits and it’s night and day difference. I don’t have a dyno shop within 300 miles sadly, so I can’t test my tune. If you can turn off torque limits and re dyno that would be awesome to see!

@nickpriegnitz5895

2 ай бұрын

I tune the truck myself. There were no torque limiters active during the dyno runs. The throttle was fully open. Timing and air:fuel ran at commanded values.

@Duramaxtuner

2 ай бұрын

Nick's got you in the reply!

Try the comparison Lzo 3.0 305 hp 495 vs 8.1 340 hp Numbers close if get gears close maybe interesting

@Duramaxtuner

2 ай бұрын

Now that's an interesting comparison. Thanks!

I loved my 8.1 should’ve kept it but the salt rotted it to 💩 had 260k miles. Just brakes and tires. Oh and lots of gas

@Duramaxtuner

2 ай бұрын

Ugh, salt. The ultimate enemy.

But I do love your videos and I do have a 05 Dodge 3500 5.9 manual 4x4 and long bed dullay with 4door cab. This my second new Dodge diesel my first was a Dodge 2500 4x4 single cab long bed and the all mighty 5.9 12 valve and I loved that truck until I drove the 05 ride like a caddy and I pull a 35’ 5th wheel and I have a 10.6 Bigfoot truck camper the I pull my alum 200 hp jet boat and I pull a 22’ Donzi Classic 502 full roller but I have too many toys but Iam 69 and don’t want to sell my toys .

I own a 2001 yukon xl with the 8.1/4l80e. I love the thing to death, but man what a pain in the ass it can be sometimes. Likes to die going down the road randomly.

Great video I myself went from 2006 8.1 with the six speed Allison to a 2012 G56 Cummins dually. Diesel for the win fuel range alone

@nickpriegnitz5895

3 ай бұрын

Can’t argue the fuel mileage gains. You’re definitely spending an extra thousand a year at the pump just using it as a daily driver.

@gerardzubrickas2685

3 ай бұрын

@@nickpriegnitz5895 towing my 10,000 pound camper I would usually get 100-120 miles to a tank add so much more time to a trip with the Cummins I’m getting around 300 miles to a tank

@nickpriegnitz5895

3 ай бұрын

@@gerardzubrickas2685 it boggles my mind that these truck came with a ~24 gallon fuel tank. Half your time with a trailer is jockeying around the gas station.

They put this engine/trans combo in the 3500HD for a couple years at the tail end of its production. That would’ve been a real workhorse rig around town. Hauling over the road long distance gasoline doesn’t work well for several reasons

@Duramaxtuner

3 ай бұрын

Definitely.

But can you do the same valve body/TCM swap to make the 8.1L truck into an 6spd, like the LB7 and LLY?

@nickpriegnitz5895

3 ай бұрын

Didn’t showcase it in this video, but yeah we can.

@chpspecial

3 ай бұрын

You don't even have to pay the diesel tax, just get the TCM from a 6 speed trans and the correct valve body for it and go. And still be able to tune the trans.

@randysullivan5723

3 ай бұрын

​@@chpspecialwith a lot or re pinning wires as factory 6 speed tcm is totally different than 5 speed one

@chpspecial

3 ай бұрын

@@randysullivan5723 yes that is true, but he gassers can source a harness from any 06/07 truck, or just re-pin as you said, and still have full control of the TCM and tune them, unlike the diesel set up where you are locked out of the TCM tune.

@randysullivan5723

3 ай бұрын

@chpspecial yea I swapped my 04 8.1 suburban with all 06 6 speed stiff. Not sure on other software but with hp tuner you could take a Ls pcm that you license and wire it in with very few wires and you could get into your tcm. License goes to the pcm if there is a tcm it will get it free

good video

@Duramaxtuner

3 ай бұрын

Thanks for the visit

Need torque numbers. HP is one thing even if the 8.1 was to put out more it will run out of torque way before the LB7.

@nickpriegnitz5895

3 ай бұрын

Torque jumped about 60ftlbs with 87 and another 10 or so on 93. 355 stock to 405/415 (from memory). Might be off a smidge Because the gas engine makes its power higher in the roof range. It does not need 700 foot pounds of torque that the tuned diesel uses. It’s also a lot gentler on the transmission.

What were the torque numbers?

@nickpriegnitz5895

3 ай бұрын

Torque jumped about 60ftlbs with 87 and another 10 or so on 93. 355 stock to 405/415 (from memory). Might be off a smidge

2006 had the 6 speed. 😉😉😉

Let’s see those torque numbers!! (Dmax vs 8.1) #InTorqueWeTrust 🤣

Lb7 all day. Dad had a 8.1 and it was great but you can’t get 22 mpg with a 8.1 and still haul heavy.

I must have an odd ball 8.1, mine gets 16 mpg while towing my 20 ft boat.

@Duramaxtuner

3 ай бұрын

You got the lucky golden 8.1