How to figure torque?
Thread Starter
Pro
Joined: Jul 2004
Posts: 693
Likes: 0
From: Cumming Georgia
How to figure torque?
I know that for rear wheel horsepower you add about 15% for the flywheel horsepower, but do you do the same for torque figure?
Example: 400hp at rear wheels= 460hp at flywheel. What would 400 torque on the dino equal, just 400?
Thanks for advice.
Example: 400hp at rear wheels= 460hp at flywheel. What would 400 torque on the dino equal, just 400?
Thanks for advice.
Le Mans Master
Joined: Jun 2004
Posts: 6,752
Likes: 3
From: Bethlehem PA
Originally Posted by rlee
I know that for rear wheel horsepower you add about 15% for the flywheel horsepower, but do you do the same for torque figure?
Example: 400hp at rear wheels= 460hp at flywheel. What would 400 torque on the dino equal, just 400?
Thanks for advice.
Example: 400hp at rear wheels= 460hp at flywheel. What would 400 torque on the dino equal, just 400?
Thanks for advice.
Ex:
460 bhp less 15% = 391 rwh
But 391rwh + 15% (58.6) = 449.6 bhp (Doesn't check out both ways)
Power is "lost" through the drivetrain, not gained from wheel to flywheel.
To get bhp from rwhp you could use 400 rwtq divided by .85 = 470
This checks out both ways. 470 rwtq X .85 (15%loss) = 399.5
Also note that as horsepower increases the formula is no longer applicable.
1000 bhp car is not going to lose 150 hp through the drivetrain.
Scott
