e6tme

As we all know, the E55 engine is detuned by the factory so it won't be faster than the SL55. The question is- how has it been detuned? More restrictive exhaust? Different ECU programming? Different supercharger pulley/bypass valve for slightly less max boost? We are only looking at a 20 hp difference so nothing drastic was done. Also, any word on the differance in torque figures? I have read that the E55 will have a rating of 700 nm/ 516 ft/lbs of torque (same as SL55) but maybe this is a misprint?

It would be interesting to find out to see how easy it will be to get full power out of the E55 when it gets here. I am sure Kleeman or Renntech will figure it out if we don't!!

awiner

Some of the hp lost is in the shorter exhaust system that the E55 employs.

e6tme

Shorter?? Doesn't the SL have a shorter exhaust than the E ??

stephens

I don't believe it has been established that the motor in the E55 is actually detuned. The SL55 motor was just re-rated by MB from the original specs as per current E55 to achieve the 493hp rating.
The performance of the E55 appears to have been nobbled over the SL by the use of a 2.65 to 1 diff ratio compared to the SL's 2.83 to 1.

oktane

I bet it is a combination of all these factors: ECU reprogramming, more restrictive exhaust, AND the 2.65 differential.

The real question is how easy will it be to put these parameters back to how they should be!

E55 KEV

I agree with Stephens. The gear ratio may make the difference. However, I speculate that the E55's HP loss will only be on paper. The Mercedes marketing gurus are downplaying it to 'maybe' make SL55, S55 and CL55 owners fell good about spending $30k more for the same HP.

The 2002 S55 & CL55 'advertised' 355HP and the E55 was advertised as 349, however, my owers manual list 355HP.

stephens

There have been posts from early Euro owners of SL55's (early 476hp cars) receiving updated registration documents re-rating car to493hp, so there were apparently no actual modifcations to SL55 to increase power as has been previously suggested.

///MB

I don't think so... aren't the E500 and S/CL/SL 500s rated at the same 302HP?
That doesn't make sense as a valid reason to de-tune it.

Also, why don't they just put ABC on the E55?

EBMCS03

so they basically are the same engine... so with the E55 you can re-program the ECU to give the output of the SL55?

///MB

Well the TQ is supposed to be the same... 516 lbft. I don't think the slightly lower HP would make as much difference as the 2.65 differential though.

I'm sure there will be aftermarket tuners who bump out more than 493HP out of it.

Shine

Yes, 2.65 will make W211/E55 more gentle, unlike heavier SL55
Too much power on a lighter E55 w/2.82 can easily trigger ESP engaged
that's my headache in the "tropic area" ! once in colder area, the problem is even worse.
AS to the claimed 476 hp, it's just numbers, the final axle ratio dominate the performance before e-limit is reached.you may
explain it as "detuned".
Delimit it, running E55 on autobahn, you'll find it invincible by its 2.65

E55 KEV

///MB, I am just speculating. Plus, no one has the real answer to why the 2003 SL55, CL55 and S55 has 493 and the 2003/2004 E55 only has 469hp.

Can you tell me why the 2002 E55's are advertised with 349 and the owners manual list 355HP just like the 2002 S55 and CL55?

e6tme

Not that this should be taken as gospel, but the Renntech site lists the torque of the 211 E55 at 506 lb/ft

I guess we won't know the true power outputs until we can see the side by side dyno results of SL/S/CL55 and an E55...

E55 KEV

Renntech must have typos. The list the 2003 CL55 & S55 at 516 torque and the 2003 SL55 at 518 torque.