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Mercedes developing 9-speed automatic transmission - 9G-Tronic

 Mercedes developing 9-speed automatic transmission - 9G-Tronic
MB 7G-TRONIC Transmission

Will be used on large displacement engines

According to a recent report, Mercedes is developing a nine-speed automatic transmission.

Dubbed 9G-Tronic, the gearbox will offer improved fuel efficiency and reduced CO2 emissions compared to the seven-speed 7G-Tronic. It will be used on large displacement engines and possibly debut on the redesigned 2012 S-Class.

Going forward, Mercedes apparently believes nine gears is the maximum number of ratios that are technically possible. More importantly, the company thinks consumers won't accept a ten-speed unit.

As you may recall, the 7G-Tronic was the first seven-speed automatic transmission when it was introduced in 2003. In recent years, it has been outclassed by the new 8-speed ZF transmission used by Audi and BMW.

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Comments (33)

passionman
CVT transmissions are great for medium side HP and torque engines, the CVT belt can hold up to 300 N-M of torque..huge Hp power up to 700 to 800 Hp with more than 1000 N-M of torque need traditional automatic transmissions like the 7,8 or the MB promising 9 speed auto transmission.
Jun 14, 2011 11:59 am
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Blackeyes21
The big trucks have 16 speed transmissions or more. Take a look at Mercedes Trucks.
Jul 22, 2010 9:31 am
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schizo
To the folks calling for CVT's... drive one and you'll see that it's good for consumer transportation devices...not CARS! I bought my daily car the W204 C250 over the C200 Kompressor even though the Kompressor engine is cheaper and much more tunable with a pulley kit because the 7G-tronic gearbox was so much smoother than the 5spd unit in the 200K. The gearbox is so smooth you don't notice the gear changes as you blast down the road. But 9spds...that's a lot of clicks on the paddles before a turn...
Jul 22, 2010 5:36 am
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xLumino
I'm a fan of cvt-boxes. compared to the 9G-automatic it has a similar function but a really lower weight. But maybe Mercedes dosn't get a harmony in a stepless shiftbox. remind some busses of them. I don't think, that conservative Mercedes-consumers will like to drive like a busdriver, but I whould prefer CVT. I drove a Nissan Primera 2.0 CVT. It was comfortable and perfect in ratios.
Jul 21, 2010 4:03 pm
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holmstar
Brings to mid this article from the onion: http://www.google.com/url?sa=t&source=web&cd=1&ved=0CBsQFjAA&url=http%3A%2F%2Fwww.theonion.com%2Farticles%2Ffuck-everything-were-doing-five-blades%2C11056%2F&ei=BPxFTOuAIMP98AaqwKDuBA&usg=AFQjCNE8vJWr1OolccclCAYUSHeXgBQLIQ
Jul 20, 2010 5:39 pm
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HEMI426
Come on 7 gears is more then enough! The people who design these thing have to be satisfined some day. They want good fuel economy, but they don't give it such long gears because the also want their car to accelerate as hell and they don't think it's nice if your car has such a gap between gears. Mercedes should take american cars in mind overdrive gearbox with six gears, cause if your engine is so strong it won't have much more trouble with a 1500 rpm gap than with a 500 rpm gap between gears. I''d spend the money on making the cars lighter I mean most c classes weigh over 1500 kg, why? Same with the new 5 series how can this car with the same enigne be almost 300kg heavier than the pervious model?
Jul 20, 2010 4:12 pm
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Piotre_k
Pointless. I can see absolutely no reason for doing this other than showing off. It won't significantly improve either performance or economy. Some AMG cars (I think S65 and CL65) still doing great with a 5 speed auto.
Jul 20, 2010 1:32 pm
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DUCATI46
Like you say douglas6250 CVT is great but leaves you very remote from the driving experience ideal for a S Class type car but not a two seat sports car.
Jul 20, 2010 12:52 pm
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Douglas6250
CVT is such a good invention as you achieve different gear ratios, different speed without having the need to rev the engine up. Yes we do agree that dual clutch gear boxes offer lighting fast, smooth gear change, but CVT went further than that, as it doesn't need to change gears !! The only downside is that it could be a bit boring as the rev of the engine hardly changes at all !!
Jul 20, 2010 11:15 am
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Sacto8780
My guess is that the 7th through 9th gears are going to be VERY tall ratio overdrive gears, which will allow for very high fuel efficiency at freeway speeds. Can you say 30-32 mpg on the EPA 2008 highway fuel economy test with the 5.5-liter V-8 engine?
Jul 20, 2010 10:42 am
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p2c
This gearbox will waste most of its life cycle in switching gears rather than helping wheels to turn.
Jul 20, 2010 10:23 am
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alessandro
What a pleasure it will be to use paddles or lever especially to change down before slow turn from 9 to 2. gear. Thanks a lot.
Jul 20, 2010 8:23 am
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dbehmoaras
The problem is that Benz realizes this may be a problem, so they would have the car change down automatically, which is even worse especially because it doesn't let you know. This is my biggest problem with the C300 that I have. I'm on a back-country road in Connecticut, when I go hard on the brakes as a enter a sharp corner. I need to shift from 5th to 2nd, so naturally I slide the gear lever to the left 3 times. Of course, the computer has already done downshifts, and all of a sudden I'm revving past 7000rpm in 1st. If Benz does not allow for more driver involvement, this will be one of the worst transmissions for fun driving. And, knowing Benz, they will do this anyway, which means I will have to go for the other Germans with a proper manual because it is nearly impossible to find a manual Benz in the States without ordering one. I guess a new A5 or 328 is in the cards for me in the near future...
Jul 22, 2010 9:25 am
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ttinjust96
ull be going pretty fast while the engine idles in 9th gear lol
Jul 20, 2010 6:20 am
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MTC
What's wrong with CVT?
Jul 20, 2010 5:58 am
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Mikeado
8 gears is too many, what's the point of 9? It's just German engineers willy waving. At least 7 make some sense - 6 for speed plus a long 7th gear for cruising. I bet the "large displacement engines" can spread the power across 6/7 gears just fine.
Jul 20, 2010 5:49 am
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m3
i think the shift will be faster more we know so the nine speed will finish in 160 or more
Jul 20, 2010 2:59 am
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A
How Ridiculous!!!, 9 speed Auto,,,WTFF!!??.. MB have too much time on their hands, just adds more cost on the price of the car.. STUPID!
Jul 20, 2010 1:38 am
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2010S5
Normal cars had 4/5/6 speed transmissions, but MB, wanting to be special, makes the world's first 7-Speed automatic. Lexus follows suit with 8, so MB responds with 9. Seriously they should just switch over to CVTs the way they're headed.
Jul 19, 2010 11:28 pm
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carbonblack
Have you ever driven a CVT trannied car? It's the most disgusting experience ever...I drove a loaner A6-CVT for a few days last year and it was a piece of crappola. Who cares if they have 8 or 9 speed when you are not shifting yourself?
Jul 20, 2010 1:17 am
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benz_man
Besides the decrease in the "enthusiastic" driving experience, CVTs seemed like a "jack-of-all-trades" answer, being extremely efficient in theory. However, in practice, the high pressure pumps required for the chains eat as much (or often more) efficiency as an auto-box with a comparable ratio spread. In the end, it is more cost effective to continue using hydraulically coupled auto-box's, which still use legacy R&D methods and coding. And, the more gears, the greater efficiency(power & economy). However, the more gears, the more intelligent the trans programming must be to maintain a comfortable driving experience.
Jul 20, 2010 3:03 pm
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catchmyshadow
it is the pen** principle. Audi and BMW are comin with a 10-speed soon and on and on it goes.
Jul 19, 2010 10:43 pm
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fgb8387
humm..huumm..huuumm..huuuumm..huuuuuumm.. why!???
Jul 19, 2010 9:40 pm
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