hey guys about how much HP/TQ is lost from the flywheel to the wheels

im just trying to get an idea of the power im goin to feel when i get my motor running

the engine is rated at about 380 hp

what do u guys think ill get to the asphalt

thanks
LCpl Kurapka

 

i wanna say 25-30% drivetrain loss but not sure

 

i heard about 15-17% with a manual and 18-20% with an auto

 

vjo is correct. Anywhere between 15-20% depending on auto or manual. I always go with 17% when I calculate mine.

 

15-20% is probably as good a guess as any at actual losses; but the effect of installing a motor in a chassis is much greater than that.

A chassis dyno owner once told me that he had a good friend who had a motor dyno. They both race stock cars. Often people would get motors dyno'ed at the one's motor shop, and then would put them in their cars and bring them to the chassis shop for further tuning. He reports that the lowest difference he ever saw between the motor stand and the chassis rollers was 22%. And that was in a race car, specifically an asphalt-track stock car. He said that 24% was much more typical for those, and 27-28% was more typical for street cars with really good exhaust and air intake setups; more for alot of cars.

If you're doing the usual Desktop Dyno type thing, I'd use 28% as the "loss" figure, rather than trying to be overly optimistic.

 

How about HP through a 700R4 and a moser 9"? Any ides, the rear is heavier (31 spline).

 

I usually think around 1/3 loss through either manual or auto.

 

Download Drag 2003, it is free as a demo, and punch in your numbers and your drive train setup. Play with it and see what numbers you come up with.
Change the trans from auto to manual or vice versa and there is your answer. Sticks are usually faster, mph wise.