ok im about to order my zz383 rated at 425hp. i also putting on accel dfi gen 7 setup on it. now lets say with the dfi it makes 440hp at the crank. i will be bolting up a t56 to it and that will be followed by my strange 12bolt. now my question is what will my wheel hp be? is there any way to figure that out? or do i just need to do it and dyno it? i would like to see at least 400 to the wheels.

thanks
ryan

 

i've always heard that , 80% of your crank hp gets to the ground on a rwd car.

 

Well if you figure a 15% drivetrain loss than you are looking at 375HP at the rear wheels. The Strange 12 bolt will rob a little more power compared to a GM nine bolt for example.

 

There is no fixed, predictable % difference in power see on a engine dyno and a chassis dyno.

as installed exhaust system and engine drive accessories are all different and unique to each car.

The test method used, (acceleration rate, correction math and test conditions all vary)

Typically ranges from 12 to 25% thou. hard to perdict where your car will fall within this range.

A eddy current dyno like the Mustang dynos will give lower numbers that a inertia type like the Dyno Jet chassis dynos.

The point of chassis dynoing a car is to find tuning improvements that result in measurable gains, not comparing rated numbers against real world results.
Doesn't mean much.

 

% based means of guessing horsepower loss isn't that accurate.

think about it

you take a whimpy ol' 4 wanger from the 70's that makes 70hp @ 6000 rpms and say the drivetrain takes 15%
that would mean it puts out 59.5hp at the wheels. so the drivetrain takes away 10.5hp

put the SAME DRIVETRAIN behind a motor that makes lets say 700 hp @ 3000rpms and it puts down 595hp to the wheels. here the drivetrain is worth a 105hp loss

first does it make sense that the drivetrain is going to make for a 10.5hp loss on one motor but a 105hp loss on another motor. using the same damned drivetrain?

then comes the second motor was spinning a lot slower so there should be less friction right? wouldn't that mean less horsepower lost? then why the extra horsepower loss just because the motor makes more power?

doesn't make sense...

stupid 15% "rules"

rant over