Engine hp vs rwhp / torque?

**cobrahunter** · 06-28-2007, 10:49 PM

Engine hp vs rwhp / torque?

Okay, so I know that there is a loss in hp going from the engine to the wheels. But what is the generally accepted loss in percentage.

And also, would there be a similar loss in percentage when talking about torque (always wondered about this but have never asked).

**blue02Z** · 06-29-2007, 03:13 AM

15-20%

**GatorSS** · 06-29-2007, 04:29 AM

For F-bodies, approximately 15% for auto trans and 12% for manual trans.

**cobrahunter** · 06-29-2007, 10:23 AM

Okay...
so if the dyno said my car was putting out 375 lb/tq, that's a real 375 lb/tq?

**Bouvers** · 06-29-2007, 04:07 PM

I've always assumed that dyno's give you your to the wheels hp/torque but I may be wrong.

**greatwhiteZ28** · 06-29-2007, 04:27 PM

dyno #s are nice but what it runs on the track really matters. from what some one said on this site " its just basically bragging rights"

**SteveC** · 06-29-2007, 05:55 PM

Originally Posted by cobrahunter

Okay...
so if the dyno said my car was putting out 375 lb/tq, that's a real 375 lb/tq?

It depends, my 2001 Z28 A4 stock motor with 3.73's and Y3000 converter had a high RWTQ rating of 365, HOWEVER that was the torque spike between 1800 and 2500 RPM, my actual RWTQ was 325 @ 5400 RPM, what you want to read is the Torque curve after the spike.

SteveC