what is the actual percentage loss from crank horsepower output to the output at the wheels on 04 sti? 20% or closer to 30% ?

 

75%



make it fwd

 

i dont think theres an absolute % that can accurately gauge bhp vs whp

 

Well there are some things that can rob hp from the crank to the wheels... Resistance/friction from gears, and friction from bearings/bushings are some. in a car there are so many moving parts that can rob hp that it is really difficult to accurately estimate how much hp is lost from the crank to the wheels... Maybe somebody posted dyno results to do a comparison to?

Tim

 

STi 300 crank to 240 wheel
WRX 227 crank to 180 wheel.

That pretty much the case in all the loss is about 40 Hp

One

 

when my rs was stock 165crank

118 to the ground


now it's most likely 230

 

i heard wrx is 227 crank, but more like 163 to the ground.
but then again mustang dyno reads low.

 

i dyno'd base 180.9hp@6000 179.2ft-lbs@4000 on a mustang dyno

 

So bone stock, its ~20% loss then in both cases. Maybe thats a new rule of thumb for subarus in that case..

Tim

 

ichi knows his stuff

 

That could very will be. The best I've seen in 196 stock on Dyno jet.
The number can very from car to car and dyno to dyno.

We can only speak to the average in a questions verses the exact of a dyno pull.

One

 

and day to day and on heat soak, how hard the fan is blowing ect.....

 

I always thought AWD cars have 30% loss whereas RWD cars had 20%.

That's from my understanding that is.

 

you sir are a moron

 

like you know anything, you only know how to bend over, get on your knees, squat, and swallow ****