jacob502

yo 63 folks,

I wanted to know how much tourqe can the 63 transmission really handle?. some tuner told me (im not gonna say who right now) that the transmission has been tested and can handle up to 1000 HP and 1000 NM (someone from MB gave him this information ). I dont want to say that he is lying or anything like that. I just want to know is there proof of this? has there really been tests on the transmission from AMG up to that power peak? if you guys really know anything, Please provide a website.


F.Y.I. Brabus worked on an ML 63 and equipped twin turbos on the engine that produce over 800 NM. Now the question is, did they modify the transmission? or did they keep it as it was and just tuned it?

jacob502

you can find the ML project at brabus.com under performance enhancments for the ML 63. Read over it, they dont mention anything about modifying the transmission and the engine produces 850 NM. A dyno sheet is available

_AMG_

The 722.9 transmission cant handle more then 560 ft lbs. (760Nm) Anything after that, the clutch starts slipping.
I know the E55 transmissions can hold alot of power.

Im sure the Brabus ML's have beefed up transmissions to hold all that power.

Yuille36

This should help in answering both questions, on the 5.5 and 6.3. Interesting read, it will educate you tremendously. http://www.marcusfitzhugh.com/CLK/63.html
And for the record Brabus rebuilds the entire drive train to handle the massive HP and torque numbers, they have too.
Ask yourself why hasn't AMG put the 7 speed tranny in the SL65 Black Series and SLR Mclaren? So am I calling that Tuner a liar, hell yeah.

Maverick1975

I had bee reliably informed that Brabus made no modifications to the ML63 transmission for the biturbo.
The mystery continues

hhughes1

They don't put the 7 speed in any 65 powered car so be warned.

jacob502

Where did you get the information that Brabus rebuilt the transmission for the bi-turbo system. Can you please provide proof of this. From what I understood is that they did not touch the transmission at all.

I dont think you can equip the 63 transmission in an SLR or Sl 65 , due to that those engines are not compatible with 7-speed. Especially the SL 65 which power can exceed the 1000 NM (which the 63 transmission cant handle)

jacob502

But I sure would like to know for sure. I think I will E-mail them and ask them

Yuille36

jacob 502,

Okay, after doing some research on my own, I admit that I was wrong 800 NM is 590 ft lbs, although on the high side, the tranny is capable of handling it. What I was trying to convey is the fact that AMG doesn't install the 7 speed in the SL65 Black Series because the tranny is incapable of handling the HP and torque number that this car puts all, that 's all. And I consulted with my friend Jack, who is a AMG Master tech and instructor for AMG. And he said that it can handle it, but when you get into the 600 torque numbers not so much, without beefing it up.

NS_C63

This is a question I have always asked. What is the true limits of the gearbox?

I also had a tuner tell me it was good for 900+ nm but did not believe him.

Over the years and after breaking a flex plate I have come to this conclusion:
The 722 gearbox is good for high nm numbers provided you keep stock limiters in place, meaning that in 1st, 2nd and on gear changes the power being put down will be limited by ECU/TCU.

This would mean that a car with a 722 gearbox making excessive amounts more power than stock either from NOS or charger will not be a suited to 1/4 runs but more to freeway/top end runs with limiters still in place.

Just my 2cents, maybe the experts can shed more light on this topic.

Yuille36

NS C63,

Sir, that made perfect sense to me, thank you.

Even Money

Well...guys are running 10s without any tranny mods that I know of.

GHAZAN

I don't think brabus sold any of those biturbo 63s either.

Is the 560tq number at the wheels or crank?

mthis

Yes well 1 guy runs 10's without issues lol. And he hot laps the chit out of it and it's fine.

mthis

That was my next Question You beat me to it

_AMG_

Exactly!! The 5 speed tranny in the 65's are bullet proof. The SLR uses a revised version of the E55 transmission.

jacob502

Actually they did. but they are all in the middle-east. I've seen one Dubai. I dont know if there are any in the USA. There was also one in the show room in Abu-Dhabi, but dont ask about price

NS_C63

Only a pleasure. I am glad someone sees thing the way I do.

jacob502

I hope that you are right my friend and that some proof can be in hands witth that. I really want to install a supercharger on my 63. My only fear is the transmission being able to handle it or not

jacob502

Thanks dor clarifying that. It sound right. I just e-mailed Brabus and i'm waiting for thier reply about the transmission that was used for ML 63 bi-turbo.

Jae Duk

FYI: Brabus bi turbo 63 has to be done by them. Also they rather sell you the Bullit then install the mod.

jacob502

I still have not gotten a reply from them. I will assume that they have not touched the transmission at all. Oh by the way, what is the price on that twin turbo system?

Viper98912

I'm pretty sure the 722.9 has gone through a few iterations since it was first introduced. At first, the 722.6 was kept in all V8's and Kompressors due to the fact that they weren't sure if the 722.9 could handle the torque. I believe the SLK55 was the first high power V8 that they placed the 722.9 in, and the rest was history. As almost all MB's now have the 722.9, I'm pretty sure they can handle a significant amount now compared to when they were first introduced.

How much is the question....

cls55

the 7 speed on the new 5.5 turbo witch is rated at 516 nm torque.

deadlyvt

the reason they say it cant handle the torque is it cant handle abuse with that level of torque.... they need to make the drivetrain able to withstand abbuse from burnouts adn break torques from idiots without having to fix things while under warranty... and yes the 7 speed would not handle 800 lbs/ft of torque abbuse...but it would easily handle it if driven normally... I have seen porsche 944 turbo transmissions which are rated to 400 lbs/ft taking a twin turbo ls1s 850 ft/lbs at the wheels without any issues.... as long as he stays away from 4000 rom clutch drops and abbusive burnouts/break torques... and that 7 speed is alot better built than that 944 tranny....