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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 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.
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June 14, 2011 11:59 am
 Blackeyes21 Blackeyes21
The big trucks have 16 speed transmissions or more. Take a look at Mercedes Trucks.
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July 22, 2010 9:31 am
 schizo 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...
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July 22, 2010 5:36 am
 xLumino 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.
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July 21, 2010 4:03 pm
 holmstar holmstar
Brings to mid this article from the onion: http://www.google.com/url?sa=t&source=we...
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July 20, 2010 5:39 pm
 HEMI426 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?
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July 20, 2010 4:12 pm
 Piotre_k 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.
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July 20, 2010 1:32 pm
 DUCATI46 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.
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July 20, 2010 12:52 pm
 Douglas6250 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 !!
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July 20, 2010 11:15 am
 Sacto8780 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?
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July 20, 2010 10:42 am
 p2c p2c
This gearbox will waste most of its life cycle in switching gears rather than helping wheels to turn.
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July 20, 2010 10:23 am
 alessandro 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.
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July 20, 2010 8:23 am
 ttinjust96 ttinjust96
ull be going pretty fast while the engine idles in 9th gear lol
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July 20, 2010 6:20 am
 MTC MTC
What's wrong with CVT?
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July 20, 2010 5:58 am
 Mikeado 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.
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July 20, 2010 5:49 am
 m3 m3
i think the shift will be faster more we know so the nine speed will finish in 160 or more
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July 20, 2010 2:59 am
 A 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!
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July 20, 2010 1:38 am
 2010S5 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.
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July 19, 2010 11:28 pm
 catchmyshadow catchmyshadow
it is the pen** principle. Audi and BMW are comin with a 10-speed soon and on and on it goes.
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July 19, 2010 10:43 pm
 fgb8387 fgb8387
humm..huumm..huuumm..huuuumm..huuuuuumm.. why!???
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July 19, 2010 9:40 pm
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