Quote:
Originally Posted by MG20i
All true enough. However I think those figures for drivetrain loss are too high. And someone needs to investigate how adding the downpipe created such a horrible 27% drivetrain loss number. Doesn't matter to me what the estimated crank hp number is. If it puts less power to the pavement then what is the point?
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it is the 4WD version -> higher drivetrain loss.
Actually crank HP matters more than wheel hp numbers (if you are looking at the pure performance of the engine)
Wheel hp numbers are not static, even on the same car, same day etc.
(back to back runs will increase drivetrain loss and therefore reduce wheel hp)
If you have 2 identical cars with exactly the same crank HP but one is rolling on 22inch 300/35 tires (just an extreme example), while the other one is running on 19inch 225/35
Wheel HP will be different, while engine HP is acutally the same.
Another example, if you measure the exact same car on 21inch (e.g summer tires) and 19 inch (winter tires), wheel HP will be different.
Thats the reason, why measuring drivetrain loss is important.
(wheel hp can also vary, depending on how the car is strapped down on the dyno)