Ever wonder if CLK63 is making the MBs claimed 475 Bhp

[onofew]

No way in Hell my car is making anyware near that figure MB advertises. What a disappointment. Most I was able to see was 364 hp to the rear wheels. Figure there is 20% drivetrain loss even with that added on it would equate to 435 at the crank. DEAR MB/AMG REPRESENTATIVES WHERE IS MY MISSING 40 HP????

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[Gtuned]

Evo Sport's base line stock HP was 418. Sounds like something is off with your car. If you car is in southern california, you might take it to Evo Sport for a Dyno just to make sure the numbers are right.

Dyno Chart

[Chappy]

Originally Posted by onofew

Figure there is 20% drivetrain loss even with that added on it would equate to 435 at the crank.

Re-calculate your math....it would equate to 455 crank hp.

Did you have the car in dyno mode? How many miles do you have on the car? What were the conditions that day? I wonder if not having 93 octane affected your dyno test?

Dyno equipment can vary and even pulls on the same equipment on different days can yield different results.

[Zod]

Originally Posted by Gtuned

Evo Sport's base line stock HP was 418. Sounds like something is off with your car. If you car is in southern california, you might take it to Evo Sport for a Dyno just to make sure the numbers are right.

Dyno Chart

thats is a CLK 63 Black with lots of stuff doen to it aside form the black upgrades

[jrcart]

Wrong, there were no mods at that time, 419whp was my baseline (stock) figure, multiply X 18% (driveline loss) and the figure is 495HP @ the crank, only 5 shy of what MB claims. After all the mods where done the car made 502whp or 593 @ the crank. BTW, there is no "standard" driveline loss figure. It is common to use 17%-20%. There are many variable such as wheel/tire weight, brake rotar weight plus about 100 more things that need to be determined before you can calculate an exact loss factor. I'll bet the loss factor is closer to 17% on my modded BS due to the Dymag wheels. 18%19% is a good rule of thumb for automatic trans equiped cars.

[onofew]

Originally Posted by Chappy

Re-calculate your math....it would equate to 455 crank hp.

Did you have the car in dyno mode? How many miles do you have on the car? What were the conditions that day? I wonder if not having 93 octane affected your dyno test?

Dyno equipment can vary and even pulls on the same equipment on different days can yield different results.

I totally agree with you on the calibration variance between two similar dynos, it even make a difference which version of Winpep software is on the dyno. But all said and done 364 is way to low.
As your conversion figures what am I missing here?? My calculator says 364 + 20%= 436
We made the pull with a big fan in placed in front, 91oct fuel, manual mode in 4th gear and dyno mode active. In reality the pull should have been done on 5th gear not 4th, on the 7sp trans 5th is the one to one gear ratio. The RWH output would be much lower on the 5th gear.
I know that there is more to be had if I had 93 or more octane, which I will do next week.

[Chappy]

Originally Posted by onofew

As your conversion figures what am I missing here?? My calculator says 364 + 20%= 436

If your using a 20 per cent drivetrain loss, take 80 per cent of 455.

455 x .8 = 364.

Stock rating is 475....so 475 x .8 = 380whp. Your initial dyno pull is 16whp (approx. 20 crank hp low).

As stated earlier, this 20 crank hp could reflect using 91 octane plus other factors like the dyno machine, whether or not your car was broken in correctly, and the current mileage. Ultimately, I hope you are satisfied with your car and driving enjoyment!

[MB_Forever]

The Evosport CLK you are referring to was actually a black series not a normal CLK63 and yes it was completely stock. Your numbers do seem a bit low.....

444 crank hp - 18% drivetrain loss = 364 whp

I would say you're missing about 30 hp or so. Please provide more info: mileage, weather conditions, etc....

[onofew]

Originally Posted by MB_Forever

The Evosport CLK you are referring to was actually a black series not a normal CLK63 and yes it was completely stock. Your numbers do seem a bit low.....

444 crank hp - 18% drivetrain loss = 364 whp

I would say you're missing about 30 hp or so. Please provide more info: mileage, weather conditions, etc....

It’s a 09/06 built, sold as an 07 model year CLK 63
When I haded the car dynoed it had 5500mi
Very favorable weather, 72F, low humidity.etc

[Vadim @ FD]

onofew:

Was the dyno done in the third gear??

You should be in 390s in the 4th and in 370s in the 3rd. Blue run is stock.

More details here:

*** VRP CLK63 Cabriolet Project ***

How many miles on the car?

[MB_Forever]

Originally Posted by Vadim @ VRP

onofew:

Was the dyno done in the third gear??

You should be in 390s in the 4th and in 370s in the 3rd. Blue run is stock.

More details here:

Vadim, do you have an air/fuel ratio on that dyno pull? His air/fuel ratio looks off

[onofew]

Originally Posted by Vadim @ VRP

onofew:

Was the dyno done in the third gear??

You should be in 390s in the 4th and in 370s in the 3rd. Blue run is stock.

More details here:



How many miles on the car?

Vadim,

The pulls were done in 4th
you said 370hp in 3rd gear, you mean 5th gear right?
Also I don't understand why most of you guys are doing these pulls in 4th, the true 1:1 gearing the 5th gear. Would't that be the proper way of dynoing the car?


As MB_Forever noticed, do you have the A/F readings from your pull, I wonder if your car was that much on the lean side

[FishtailnZ]

Well if running the car at a local 1/4 track is something that is doable, then that's another way to see what power you're actually putting down - trap speed are a great indicator of hp. If your traps are pretty well the same as other CLK63's are hitting, I wouldn't worry about dyno figures.

[MB_Forever]

Originally Posted by onofew

Vadim,

The pulls were done in 4th
you said 370hp in 3rd gear, you mean 5th gear right?
Also I don't understand why most of you guys are doing these pulls in 4th, the true 1:1 gearing the 5th gear. Would't that be the proper way of dynoing the car?


As MB_Forever noticed, do you have the A/F readings from your pull, I wonder if your car was that much on the lean side

I think the reason they did it in 3rd or 4th is because at any higher gear, you'll hit the speed limiter on the car and/or the dyno. Most people dyno in 4th then if you want, you can correct "slightly" for gearing.

[Vadim @ FD]

Speed limiter in 5th is the reason, plus lack of proper cooling (170MPH) will effect the true numbers. This is why I do 63s in 3rd and 4th to show the gains accross a wider range.

I would suggest going to the dealer and getting latest software update done. Also check stock airfilters and pull out carbon filters.

Good Luck!