Big Rotors = less horsepower at the wheels Options

[anthony]

I've been watching Sports Car Revolution on Speed lately. Of course most of the cars they feature are Japanese but I really like that they put everything through a dyno. The balance bling bling and performance mods pretty well.

Anyway, they are doing an Acura RSX project right now. They fitted the car with a big brake kit - you know, big rotors and big calipers. Their times around the track didn't really improve even though they were faster around the corners because they could brake later.

After dyno testing they came to the conclusion that even though the big brake kit was lighter than the stock brakes it resulted in a 7 hp loss at the wheels because of the increased rotating weight of the big rotors.

I thought it was a pretty interesting result.

[tat2dphreak]

IMHO: the "at the wheels dyno" is best used when you know the real hp/tourque of the engine, then you measure the hp at the wheel, to measure how efficient you are getting that hp to the wheels...

if you measure 100 hp at the flywheel, and then you measure the same engine in a car and it gets 90 hp at the wheels, that's a 90% efficiency...


of course if you look at it 1 way, the only hp measurement that counts(if any of them count for more than bragging rights) would be what you are putting through the wheels...

just to piss people off, I like posting this link... Horsepower-v-torque.htm