I've heard and read differing opinions on this. Some say it's underrated, whilst others think it's dead-on.

 

Several dyno tests have shown that E55 motor is producing upwards of 500 crank hp most showing around 520.

 

Mine did 400rwh with a bad water pump.
400x1.2=480 to the crank, I am not sure about the conversion. But it's what I've heard.

Regards,
E55 POWER

 

Multiplying RWHP * 1.2 is not the correct form of conversion considering 20% drivetrain loss. The correct way to convert RWHP is this: RWHP / .80

Evosport dyno'd a stock E55 - there's a thread about it on the forums about it - I believe they dyno'd at around 520 crank.

 

Evosports dyno numbers tend to be a little higher than seen on other dynos. The E55's produce around 15rwhp less than the S/SL55's on average from what I have seen. I think the numbers are dead on.

 

Most E55's dyno around 405RWHP or slightly more in stock form. Assuming 20% drivetrain loss, that's 506 HP at the crank. If you assume 18% drivetrain loss as some have stated that Mercedes claims, then it's 493.9 HP at the crank, exactly the same as they claim for the SL55.

 

Click here for a very conservative estimate469 but it keeps the rustangs from tailgate en.

 

 

I have actually had my CLK dyno'd by Evosport and 2 other independent shops. The other shop using a Dynojet netted almost the exact same numbers. The other shop that used a Dynapak dyno netted 3 hp less at the rear wheel.

As for what the E55 really puts out at the crank.... all that matters is what it puts out the rear wheel. Pick a drivetrain loss % and you can pretty much make it whatever you want. I usually use 15 - 17%, but I don't think anyone on this board knows what it really is

 

amg told me over the phone that its 18% loss.

 

It's very impressive, nonetheless.

Thanks for the informative replies.

 

Is this dyno sheet for a stock E55K? The torque is 586 lb/ft when converted to crank, using 18%. Is the torque that underrated, too?

 

Yes.

 

Using a 18% loss factor,

422.7 RWHP equates to 515 Crank HP.

481.3 RWTQ equates to 586 Crank TQ.


RWHP / 82 * 100 = x



I have been told DynoJet's sometimes show approx 10% greater #'s than in reality.