2 rear gears in 7G Tronic? - MBWorld.org Forums

04-17-2018, 02:16 PM

#1

sander.manzoli

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C63 AMG 2012 Sedan

2 rear gears in 7G Tronic?

https://en.wikipedia.org/wiki/Mercedes-Benz_7G-Tronic_transmission

1 2 3 4 5 6 7 R-1 R-2
4.377 2.859 1.921 1.368 1.00 0.82 0.728 -3.416 -2.231

What the hell is this? 2 ratios?? Really 2 gears???

Last edited by sander.manzoli; 04-17-2018 at 03:42 PM.

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04-17-2018, 03:09 PM

#2

Jasonoff

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2010 C63 AMG

It comfort mode it uses the the 2nd reverse gear so you don't have too much torque at the wheels.

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sander.manzoli (04-17-2018)

04-17-2018, 03:35 PM

#3

sander.manzoli

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C63 AMG 2012 Sedan

Quote:

Originally Posted by Jasonoff

It comfort mode it uses the the 2nd reverse gear so you don't have too much torque at the wheels.

Thanks!!
So, when in confort mode, you can go faster in rear than you could do in Sport or Sport+ mode... usefull info for a reverse racing, lol

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04-17-2018, 04:12 PM

#4

Funkwagen

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2009 C63 AMG, 2010 C250 4Matic Sport

Quote:

Originally Posted by sander.manzoli

Thanks!!
So, when in confort mode, you can go faster in rear than you could do in Sport or Sport+ mode... usefull info for a reverse racing, lol

fun fact: there's actually an electronic speed limiter for reverse in the ecu, I believe stock is 60 or 80km/h

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04-17-2018, 05:24 PM

#5

Jasonoff

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2010 C63 AMG

Quote:

Originally Posted by sander.manzoli

Thanks!!
So, when in confort mode, you can go faster in rear than you could do in Sport or Sport+ mode... usefull info for a reverse racing, lol

No, it would shift from R1 to R2. C just starts in R2.

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04-17-2018, 06:32 PM

#6

BalanBro

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2012 C63 P31 Sedan

What is the practical purpose of 2 reverse gears? Just so the transmission can cost more?

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04-17-2018, 06:57 PM

#7

Mort

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2012 C63;1971 280SE 3.5(Sold);2023 EQS 450 SUV 4 Matic (Wife's)

Quote:

Originally Posted by BalanBro

What is the practical purpose of 2 reverse gears? Just so the transmission can cost more?

Less torque to the ground in slippery conditions, ice and snow especially.

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04-17-2018, 10:12 PM

#8

BalanBro

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2012 C63 P31 Sedan

I get that, but a car like this would do fine with just one taller gear. It would make more sense to me on a car with a small engine with little torque.

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04-17-2018, 10:25 PM

#9

Jasonoff

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You want max acceleration when escaping the popo dawg...

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BalanBro (04-18-2018)

04-18-2018, 02:19 PM

#10

sander.manzoli

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C63 AMG 2012 Sedan

Quote:

Originally Posted by Funkwagen

fun fact: there's actually an electronic speed limiter for reverse in the ecu, I believe stock is 60 or 80km/h

Nice to know...
I´ll try a rear launch in sport (to force R1) and then shift to Comfort, and check if rpm drops (if gear changes to R2)... curious.

Last edited by sander.manzoli; 04-18-2018 at 02:24 PM.

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04-18-2018, 02:22 PM

#11

Jasonoff

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2010 C63 AMG

Quote:

Originally Posted by sander.manzoli

Nice to know...
I´ll try a rear launch in sport (to force R1) and then shift to Confort, and check if rpm drops (if gear changes to R2)... curious.

And crash into something so you can get a different car and ask these sort of questions on a different forum?

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04-18-2018, 03:31 PM

#12

sander.manzoli

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C63 AMG 2012 Sedan

Quote:

Originally Posted by Jasonoff

And crash into something so you can get a different car and ask these sort of questions on a different forum?

I do like to ask these sort of questions... you know, the ones I don´t know the answer... 2 rear gears was news to me. And you seem to love this sort of questions, since you are number #1 replier. Much appreciated!
(And I didn´t see you had already answered my question when you said it would shift from R1 to R2)

And no, I´ll not crash into anything... you can move your weird sick evil desires elsewhere. Not even doing it anymore, since you brought the answer already. Thanks, bad guy! You´re probably nice, specially in good mood!

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