Living with a Mercedes 7G DCT transmission - Review and Advice!
Автокөліктер мен көлік құралдары
Hi Guys,
In today's video, discuss the Mercedes 7 speed dual-clutch transmission, what it's like to live with and how to maintain it!
#Mercedes #AClass #7GDCT #DCT
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More information on the transmission here!
Drawing on over 50 years of experience in the development and production of automatic transmissions, Mercedes-Benz ventured into new technical territory with the 7G-DCT dual clutch transmission: the new system is an automated three-shaft manual transmission consisting of two subtransmissions, each with its own clutch. Both actuation of the clutches and gear shifting take place fully automatically and without any interruption in tractive power. This allows a particularly comfortable but nevertheless dynamic mode of driving.
Thanks to its seven gears it offers an exceptionally large spread of up to 7.99. This means that a very short transmission ratio is available when moving off on an uphill slope with a high payload, for example, while during cruising the engine speed can be lowered considerably. The efficiency of this transmission leads to a nine percent improvement in fuel consumption compared to the CVT employed in the A-Class to date, and betters the consumption with a manual transmission.
At a length of 367 millimetres and a weight of 86 kilograms, the 7G-DCT is more compact and lighter than the transmissions in this torque class which have been available on the market to date. The clutches take the form of oil-cooled multi-disc clutches. The specially developed hydraulic fluid is actively cooled, thus ensuring correct functioning of the transmission even under extreme conditions, despite the comparatively low filling level of six litres.Excess engine heat can also be transferred to the transmission, which
improves its efficiency.
For the first time on this type of unit, the transmission is supplied with oil by two oil pumps - one mechanical and one electric. The electric pump maintains the oil pressure when the engine is switched off via the start/stop function. This means that the transmission is immediately operational when the engine is restarted and the vehicle can move off again without any delay. In addition, the electric pump is able to support the mechanical pump when peak loads apply, enabling a more compact and efficient design for the mechanical pump.
Another new feature is electric activation of the hydraulics for the parking lock, which is locked by mechanical means. This "park by wire" function enables the transmission selector lever to be positioned as desired: it is located in the form of a steering column lever on the right behind the steering wheel in the A-Class. In combination with the electric parking brake, additional space has thus been created in the centre console for additional stowage facilities.
Three gearshift modes are available to the driver:
ECONOMY: In this mode, the transmission performs gearshifts fully automatically and particularly comfortably. The gears are selected with due regard to a particularly economical style of driving at low revs.
SPORT: The transmission performs gearshifts fully automatically. The shift and response times are shorter, with gearshifts at higher engine speeds.
MANUAL: In this mode, the driver operates the transmission manually via shift paddles behind the steering wheel. The engine speeds at which the gears are shifted can therefore be freely chosen.
In ECO or Sport mode, the driver is still able to intervene manually in the gear-shifting process via the shift paddles. The transmission reverts to the selected automatic mode after the paddles have remained inactive for twelve seconds, or after a longer delay when driving downhill or on winding roads.
A key factor contributing to the overall efficiency and dynamism of the A-Class is the closely coordinated operation of the transmissions and engines. A continuous exchange of data between the control units ensures that the engines run at the ideal operating point at all times. The 7G-DCT transmission is manufactured at Daimler's Stuttgart-Hedelfingen plant. Donate to support the Drivelife channel here: www.paypal.me/drivelifeyt
Пікірлер: 25
Obrigado pela informação e dica amigo, um forte abraço (Brasil - São Paulo) thanks
Hey! Nice video! :) I have A200 with DCT. Usually it is lagging when i use it in traffic especially shifting 1. and 2. gears back and forth. What dou you think softwear updates on motor and transmission softwear ? Could help something ? Really annoying this lagging and also hear some noisy too. The other gears are okay. I experineced in Sport mode not doing it every time, strange.... Diesel engines do the same ? They have more basic power to roll over the gears. Thank you for your answer.
Love the Petronas green lip in the bumper! Is it from factory or custom?
Beautiful black car
im driving a cla 180 do to you realise that gear 1-2 is very rough ?
Considering buying one of these, so thanks for posting. Is that 220d engine good?? Reliable? Is it noisy? I'm guessing road tax is low too.
@drivelife.channel
3 жыл бұрын
Yes the 220d engine is brilliant! Its a little noisy but it is bulletproof, gets over 60mpg on the motorway and its only £20 a year to tax 😁😁😁
@paullockwood7219
3 жыл бұрын
@@drivelife.channel Brilliant. Good to know. I'm currently running a 10 year old120d BMW Msport which is so powerful and quiet you wouldn't even know it was running on 90k miles, so shame about the lack of noise insulation on the Mercs, but I think to be fair the current BMW Diesels are the same. Thanks for the reply. 😊👍
@drivelife.channel
3 жыл бұрын
Having had a 120d m sport aswell, they are fairly equally matched, I think merc is slightly quicker though 😁
@paullockwood7219
3 жыл бұрын
@@drivelife.channel That's good to know. 😁 I looked at used A45 recently but the running costs and insurance were off the scale for me. I just want the Pano roof option on whichever A class I buy as they look fabulous.
@TheJmebe
3 жыл бұрын
I've got a 2020 GLB 220d - had a BMW 520d before. Maybe that the GLB engine is still running-in, but definitely rougher and noisier than the 520d. Power very similar. 520d was around 60mpg at 70mph / GLB 220d is around 50mpg at 70mph - body shape obv a big factor though (4matic is only driving front wheels in this scenario so isn't a factor)
W177 a200 gearbox broken in 20000km, now at dealer
@whereslp
10 ай бұрын
Reason ?
where do you go to put so many miles on your cars lol, 1,000 miles in 2 weeks! damn if you done that for just 6 more weeks you would surpass my 17 year old car in just 4 years haha. nice video!
@drivelife.channel
3 жыл бұрын
🤣🤣🤣🤣 thats the downside of living 20 miles from anywhere 🤣🤣🤣
How do they compare to the 8 speed ones BMW use I wonder, MB has always done good autoboxes but have heard the 8 speed BMW ones are fantastic
@drivelife.channel
3 жыл бұрын
The MB dual clutch is phenomenally smooth when on the move, but jerky when at low speed, the bmw one is a fantastic all rounder:)
@Gr3eGo
3 жыл бұрын
@@drivelife.channel So true, not good for short distances and slow trafic.
@TheJmebe
3 жыл бұрын
See my comment above..
@matyasnemcsik8422
2 жыл бұрын
@@drivelife.channel What do you think reset and relearn the trasmission? The 1and 2 gears are noisy and jerky for me.
@psions555
Жыл бұрын
If you are referring to the ZF8HP then there is probably no automatic on earth that can compare. Probably the finest automatic available. It's got the smoothness of a torque converter auto with the shift times and firmness of a DSG. I used it in a F21 118d and it was literally just perfect in every way. I don't think the front wheel drive 9 speed is as good so I've been told but not experienced
You say it’s a joy, yet I watched a good review by an experienced reviewer of this and it was a bad transmission, he even had to take it back to the dealer 3 times to work out why it was jerky. The dealer said well that’s just how it is. I was strongly considering this but not now. By the way my Toyota which has 220,000 kilometres on it has never had any issues and the auto behaves faultlessly. Change the fluid every few years and job done. I want to get a nice new car but all these modern cars are trying to be too clever for their own good.
@Marcesko
Жыл бұрын
Dual clutch trannys tend to be jerky in some situations, that's to be expected from a "manual" gearbox where robot predicts and selects the gears for you unlike the traditional AT's. But most of the time it's a really smooth exprience.
@ZzxOPTICxzZ
11 ай бұрын
Probably worth looking at a W204 C Class with the 7g-tronic plus if you want a more traditional autobox