Loss %'s on Dyno
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Joined: Nov 2004
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From: Sugar Land, TX
CLS55
Loss %'s on Dyno
all:
i dynoed my 55 today during a euro "dyno day" at Bavarian Hyper Sports in Houston. my wheel HP runs were 406, 417 and 410. the Dyno is off by 3% (needs some calibrating because something happened to it when they moved to their new location). he said my real numbers are in the 431 WHP range.
anyways, what i wanted to know is if it is really possible that less than 10% from the crank to the wheels or is MB really underating these cars? they were saying that on an automatic car, loss should be 20-23%, but mine is either much less or the crank HP is actually over 500.
safeer
i dynoed my 55 today during a euro "dyno day" at Bavarian Hyper Sports in Houston. my wheel HP runs were 406, 417 and 410. the Dyno is off by 3% (needs some calibrating because something happened to it when they moved to their new location). he said my real numbers are in the 431 WHP range.
anyways, what i wanted to know is if it is really possible that less than 10% from the crank to the wheels or is MB really underating these cars? they were saying that on an automatic car, loss should be 20-23%, but mine is either much less or the crank HP is actually over 500.
safeer
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Joined: Nov 2004
Posts: 375
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From: So. Cal.
2006 CLS55-030, 2002 BMW 540 Wagon, 1995 VW Jetta GLX
Lower Still!
IMO I think it is lower than 15% for Drive Train Loss at the rear wheels. 20-23% is more like what would be experienced with a four wheel drive vehicle, although the higher percentages do make the Tuner look good and the Motor look strong. Using 15% loss would put your E55 HP @ 466HP to 479 Hp at the Crankshaft, which is where it should be. 
- Bob
- Bob
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Originally Posted by idrivatitleist
I'm not the expert, but I believe around 18% is closer to the # used for HP loss from crank to wheels.
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From: Ventura, CA
AMG 55, 335i, Mini Cooper S
From what I have seen the drive line loss is about 21%. The Mercedes is a very strong and smooth tranny but isn't very effecient compared to some others. I wish the tranny loss was around 15%.
My car is rated at 349hp stock and I dyno'd 290whp with exhaust, K&N's and Evo Pullies. The car is now 360whp with the supercharger.
My car is rated at 349hp stock and I dyno'd 290whp with exhaust, K&N's and Evo Pullies. The car is now 360whp with the supercharger.
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Joined: Nov 2004
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From: So. Cal.
2006 CLS55-030, 2002 BMW 540 Wagon, 1995 VW Jetta GLX
Vadim-SoCal - What Say You?
Vadim-SoCal - So what is the Drive-Train loss on the E55 and the CLS55? Give us a range from the best (least) to the worst (most) for Dynos you are familiar with.
It would be very surprising to me, for drive train loss to be 20%, for a two wheel drive configuration. That would mean that it takes upwards of 93 HP to run the Drive-Train on a stock CLS55 or E55. Also, it is difficult for me to understand why a Drive -Train takes more HP to run it as the HP of the Motor is increased. I would think that the Drive -Train takes "X" HP to run it and as the HP of the Motor is increased this "X" amount of Drive-Train loss becomes a smaller percentage of lost HP at the rear wheels.
What do you think Vadim-SoCal? - Bob
It would be very surprising to me, for drive train loss to be 20%, for a two wheel drive configuration. That would mean that it takes upwards of 93 HP to run the Drive-Train on a stock CLS55 or E55. Also, it is difficult for me to understand why a Drive -Train takes more HP to run it as the HP of the Motor is increased. I would think that the Drive -Train takes "X" HP to run it and as the HP of the Motor is increased this "X" amount of Drive-Train loss becomes a smaller percentage of lost HP at the rear wheels.
What do you think Vadim-SoCal?
- Bob
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Originally Posted by Evolution Marine
It would be very surprising to me, for drive train loss to be 20%, for a two wheel drive configuration. That would mean that it takes upwards of 93 HP to run the Drive-Train on a stock CLS55 or E55. Also, it is difficult for me to understand why a Drive -Train takes more HP to run it as the HP of the Motor is increased. I would think that the Drive -Train takes "X" HP to run it and as the HP of the Motor is increased this "X" amount of Drive-Train loss becomes a smaller percentage of lost HP at the rear wheels.
