I saw a dyno chart of a stock C55 and I think it said 327 HP @ 5700 and 341 TQ @ 4200 at the RW. With 16% drivetrain loss that would be 380 HP and 395 TQ. But MB says 362 HP @ 5,700 and 376 TQ @ 4,000 rpm. Anyone know what they usually make stock at the RWs?

 

I dyno'd at 301rwhp.. Didn't get my tq reading..

Those number seems lil high to me..

 

Yeah. And I saw your dyno sheet up on Drag Times. Pretty impressive too. Most there were coming in right around 300 RW hp. With 19% or 20% frictional loss you would be right at the factory numbers. I thought 310 might be typical RW. And dyno results can vary widely but not usually by 20 or 25 hp.

 

Here is a Dyno plot I found from RRI

http://www.rri.se/popup/performanceg...p?ChartsID=234

 

Thanks! This is stock?!? I'm not sure I fully understand what they are reporting.
I read that as 325 RW HP and 335 RW TQ (they call it wheel power). With 17% power-tain loss that would be 380 HP and 391 TQ at the crank. What confuses me is their use of "bhp" when showing what they imply is wheel power. I thought "bhp" meant base horsepower or crank horsepower.

 

different dyno.. that's prolly why.. I did mine on Dyno jet

 

Early 55s are in 290s, later ones are at 300-305RWHP range.

If we use 17% loss, we got 300/0.83 = 361 HP.

 

Depends on what kind of dyno though.

 

Ok, there we go. We should expect about 300 RW HP on the later models. Thanks.

 

Whats the difference between the earlier/later models that would result in the difference?

 

Earlier model meaning the 210 E55? or CLK55? Here is an interesting dyno from an SLK55

http://www.rri.se/popup/performanceg...p?ChartsID=607

 

All these dyno's are with the brake rotors and wheels remove. This doesn't show you real world rear wheel power.

 

How does one go about getting "wheel" horsepower readings if the wheels are removed?

It specifically says wheel power and wheel torque.

???

 

Well if you look at the "Details" tab, it mentioned what wheel/tire dimension was.

 

Here are dynoes of stock W210 E55 vs. W203 C55. The difference is 1 point in compression.

 

bhp = brake horse power

There can be big swings on readings depending on the brand dyno a car is run on. There are also weighting factors that can be applied to adjust readings. From what I understand, Dynojet units tend to come in on the most realistic side of numbers.

 

I've heard from many quite the opposite. Mustang dyno's and Dyno-dynamics are said to give more tru to life readings. And usually lower #'s.

 

Interesting. I have a reading from a Dyno-Dynamics on my GTO and based on what others have run, the numbers seemed high. I found a local shop that has a Dyno Jet unit so I may put the car on there to compare the numbers.

 

I've dyno'd my car numerous times on different dynos and can tell you that Dyno-Dynamics yields higher numbers than Dyno-Jet.

 

That's what I've been told by many others as well. What was the approximate delta between the two different readings? I'm assuming of course you may have run the car in the same configuration on both dynos. Thanks.

 

Not Adams dyno!

 

My SLK55, which has the same engine, dyno'd just under 300whp. I would say that the norm is 290-310whp for these engines. There is no way that a stock C55 will dyno at 327whp, unless the dyno is not accurate.