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Old 01-25-2011, 12:15 PM   #1
Drives: 2010 2SS RS A6
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HP gains and losses question

Going back to lurking

Last edited by TX_Shane; 06-24-2011 at 02:29 PM.
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Old 01-25-2011, 12:29 PM   #2

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I look at the percent as a guesstament of a base run. After the base run it becomes more of a fixed number. You can only get true numbers from doing an engine dyno before doing a chassis dyno. So in reality if you are loosing 75hp from crank to tires, that number should stay the same no matter what the crank hp is.
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Old 01-25-2011, 12:30 PM   #3
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I'm sure much smarter people can give you a more detailed answer.

But, Here's my cut on it.

most turners use 18% drive line loss for the autos...

18% is the constant factor when calculating drive line loss. the more power you add at the crank the bigger the difference between that and what you get at the wheels.

The 74 hp loss you cite is based off of crank not wheels. drive train loss is easier to grasp if you consider it from the crank HP number... I know that doesn't work as very few of us pull the engine to get real crank HP... we all do the chassis dyno and work the numbers in reverse... but either way...

the drive train loss is always a percentage, not a static number subtracted from the total crank HP or added to the RWHP...

Hope that makes sense...

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Old 01-25-2011, 12:33 PM   #4
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Anyone who really wants to know will ask for the RWHP and understand it. For the rest just do the fuzzy math and give them a number... That's all they want anyway...

BTW... Welcome and nice first post... Come join up with us sometime around Houston. We have a cruise going this coming Sunday...
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