Quote:
Originally Posted by xgnxs
Isn't the GT500 rated to make 662 hp? That would be a 10% drive train loss. Same thing for the hellcat. I know a lot depends on the dyno but maybe we're in the age of only 10% loss instead of the expected 15%? That sure would be great!
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Drivetrain efficiencies have improved no doubt.
What I don't understand is how one can guess and extrapolate a hp figure they consider accurate that is based upon a guess on top of a guess. For one you are guessing how accurate the given dyno is and also guessing drivetrain loss. Not to mention readings can vary depending on operating temp, proper air to the engine during testing and tire pressure just to name a few.
Also figuring drivetrain loss will only become more inaccurate as horsepower increases. 12% drivetrain loss of a 300 hp motor would equate to about 265rwhp. So in this crude example it takes 35 hp in this make believe car to spin all the accessories, transmission and wheels etc. So now take that same car and put in 600 hp and change nothing else..... Is it now going to take 70hp away going to the wheels instead of 35 like when it had 300 hp? No
Drivetrain loss is a guess and so is the accuracy of the dyno. I put more stake in the new sae standards for hp compared to results that vary as much as 30hp from reading to reading across the country lol.