Does anyone have anymore information on this? I can't find any aside from what is on Evosport, and MKB's site has no information.

http://www.evosport.com/product/driv..._mercedes.html

Accord this is a letter from MKB explain the different between the two differentials.
Hope that will help you


(Sorry for the delayed information but the number you gave me before did not work.
You asked for the sports differential:

For a better acceleration rate in the low speed region I recommend you a sports differential with a shorter rear axle transmission ratio (i=3.06)

For not loosing top speed we can re-program the ECU in order to higher rpm. So the top speed can be recovered.

The price for the standard sport differential in EUR 3.150,00 and EUR 5.200,00 with locking (40 to 75%). The locking gives a much better acceleration from curves/corners or slippery underground.)


Pavlos

That recalls me, Sleeslack got it on his Top-gun CLK430.
That's for V8 models which final ratio is 2.82
C32AMG is just perfect at 3.06.

How much are those nos in dollars??

TIA!

But if you are looking for acceleration i think it's a good idea

What is the top-speed loss by upgrading to the MKB sport drifferential?

You will not loose any of your top speed because they will reprogram the ECU so that will keep the top speed.

I change it in my S500, and then they program the ECU for my car, the top speed still the same.

Let's say I am consistently accelerating my C32 in 5.1 seconds for the 0-60. How much will my time improve by getting this differential?

I don’t have any idea about the C32, but in my opinion it is very expensive.

Changing your differential will have an effect on your top speed. With a 3.27, I would figure about 300-500 RPM loss per gear, so probably a 5-7% loss in top speed. Assuming that the top speed is 155 MPH, this would change to about 144-147, though it may be a bit on the higher side with automatics.

I was assuming that since the car's top speed is governed at 155mph, the loss would come from the unrestricted top speed of 175mph. Y is it not like this?

I did not know the top speed, so I based it off of the electronically limited speed. With a top speed of 175, you should still be able to hit the speed limiter after the 3.27.

Guys, a friend with Kleemann C32K tells
(1) Over stock boost, made his car very close to C32AMG
Now, let's check the difference of final ratio
Mine, C32AMG, 3.06
His, C32K , 3.27
0~100 km/hr I finished it by 2nd gear as you already know.
the c32k took 3rd gear to cross 62 mph, and think the time loss
for 1 more shift....
Top speed for 3.27 by "Kleemann power", he reaches 271 km/hr
while my stock C32 hits 282 km/hr.....

Mathematically the 3.06 shifts at 6250 redline at 41, 67, 105, 148, 178 mph. the 3.27 would shift at 6250 at 38.5, 63.1, 98.1, 138.3, 166.6.

So assuming the car shifts at 6250 (which it should be able to do under the best circimstances), 0-60 would theoretically be better with the 3.27, but quarter mile might suffer IF an extra shift is introduced.

But I think most C32's will make the 105mph shift in the quarter mi anyway.

Getting the rubber to the road might not be as easy though.
Top speed is not really an issue. Because of the limiter in the US.

Would changing the final ratio and NOT reprogramming the computer still mean losing the MB warrenty ?

MB cannot void your warantee because your modify your car. The only way your warantee is void is if a problem occurs and it is found that the cause of the problem was the modification you made. It is against the law for MBUSA to void our warantees because we modify our cars, unless those modifications are the cause of a problem, then MBUSA is not responsible.

With my Camaro I had a 3.23 rear gear. With that and my 4speed auto I was actually shifting gears crossing the finish in the 1/4 mile. The next lower gear GM made for the car was a 2.73, a little too low IMO. But the 6 speed Camaros had a 3.13 gear. I found one swaped it out with mine and only shifted once during the 1/4. I was electronicly limited to 155mph, i could still hit it easy with the new gear.

Without programming changes to the EGS controller you car would always be in ESP FAILURE mode. The car is "coded" in the ECM to know what rear it was built with, no changes and it thinks all four wheels are slipping! No fun at all- Reprogramming is a must with a rear diff change, period.