RWHP VS. Crank HP??
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Joined: May 2005
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From: Massachusetts
Car: 85 Trans Am
Engine: 350 T.P.I.
Transmission: WC T-5
RWHP VS. Crank HP??
what is the % lost when measuring hp @ the crank in relation to hp @ the rear wheels?? Is there a formula to convert?
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
There are estimates, but no formulas because of variations from drivetrain to drivetrain.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
No. The only way to know is to have your engine run on an engine dyno and then run it on a chassis dyno.
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From: Hamilton
Car: 1990 IROCZ Camaro
Engine: 350 4bbl, 200cc Heads, 270hr Cam
Transmission: 700R4 w/ Trans-Go shift kit.
Axle/Gears: GM 10 bolt Posi
Theres a General estimate, and that estimate is:
20% loss for your average automatic drivetrain
15% loss for your average manual drivetrain
These arent meant to be 100% accurate, rather, just give you an idea.
One way to reduce this loss is to get a light driveshaft. Aluminums are popular, but about 400$ new. You could also opt for a carbon fiber driveshaft, which only weigh about 3-5lbs! That's about 80% lighter than your stock driveshaft, but be aware your wallet will also be 85% lighter.
20% loss for your average automatic drivetrain
15% loss for your average manual drivetrain
These arent meant to be 100% accurate, rather, just give you an idea.
One way to reduce this loss is to get a light driveshaft. Aluminums are popular, but about 400$ new. You could also opt for a carbon fiber driveshaft, which only weigh about 3-5lbs! That's about 80% lighter than your stock driveshaft, but be aware your wallet will also be 85% lighter.
Last edited by GuitarJunki17; Jun 26, 2006 at 06:53 PM.
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