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Hp at the crank??

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Old Jul 30, 2009 | 04:42 PM
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Default Hp at the crank??

440rwhp 401tq

how much hp is that at the crank???
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Old Jul 30, 2009 | 05:32 PM
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probably around 500 based on what stock Z06's put down.
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Old Jul 30, 2009 | 05:38 PM
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Auto- 440 at rear would be about 525 crank (17% loss)
manual- 440 at rear would be about 490 crank (10% loss)
Hope that helps (just a guide, not an exact measurement)
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Old Jul 30, 2009 | 06:21 PM
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Originally Posted by MLCZ51
440rwhp 401tq

how much hp is that at the crank???
Auto approx. 505/466, manual approx. 495/456. Z06's usually run 440-450 rwhp. At on near 500 crank is as close as you'll get.
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Old Jul 30, 2009 | 11:43 PM
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The rule of thumb that I've always understood is 15% drivetrain loss for manual and 18% loss for automatic.
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Old Jul 30, 2009 | 11:45 PM
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Originally Posted by BOB EAGAN
Manual approx. 505/466, auto approx. 495/456. Z06's usually run 440-450 rwhp. At on near 500 crank is as close as you'll get.
Fixed it for ya!
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Old Jul 31, 2009 | 06:36 AM
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Default Another variable

If you have 4.10 or 3.90 gearing I beleive the equation is different. Something about not being able to get a "good pull" with short gears.
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Old Jul 31, 2009 | 12:16 PM
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Originally Posted by MLCZ51
440rwhp 401tq

how much hp is that at the crank???
Multiply those numbers by 1.12-1.15.

BJK

Last edited by 07MontRedcp; Aug 1, 2009 at 11:50 AM.
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Old Aug 2, 2009 | 12:28 AM
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Default Et..

Originally Posted by 07montredcp
multiply those numbers by 1.12-1.15.

Bjk
z-51 6 speed on m/t dr's ..what will it run....with good driver?? 440 rwhp 401rwtq??
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Old Aug 2, 2009 | 12:38 AM
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Originally Posted by MLCZ51
z-51 6 speed on m/t dr's ..what will it run....with good driver?? 440 rwhp 401rwtq??
Low-mid 11's....With a great driver and awesome weather, high 10's
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Old Aug 2, 2009 | 02:27 AM
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Default cool air

Originally Posted by Tony B4
Low-mid 11's....With a great driver and awesome weather, high 10's
40 degree weather, good 60 ft ..say 1.65 to 170 range i'm thinking 11.10 to 11.20's..
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Old Aug 2, 2009 | 05:56 AM
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Originally Posted by saplumr
Fixed it for ya!

Actually, you didn't. It was more correct to begin with. Actual flywheel/crank numbers would be higer for an Auto than they would for a manual. An auto sucks more power than does a manual. As an example, 500chp through an auto might read 425wheel, while 500chp via a manual might read 440wheel.
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Old Aug 2, 2009 | 01:03 PM
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Originally Posted by SlickShoes
Actually, you didn't. It was more correct to begin with. Actual flywheel/crank numbers would be higer for an Auto than they would for a manual. An auto sucks more power than does a manual. As an example, 500chp through an auto might read 425wheel, while 500chp via a manual might read 440wheel.
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Old Aug 2, 2009 | 02:13 PM
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Originally Posted by SlickShoes
Actually, you didn't. It was more correct to begin with. Actual flywheel/crank numbers would be higer for an Auto than they would for a manual. An auto sucks more power than does a manual. As an example, 500chp through an auto might read 425wheel, while 500chp via a manual might read 440wheel.
Huh! I think you're right. Sometimes the mind is a wonderful thing and other times it's nothing more than a trap. Obviously my comprehension skills were slightly off.
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Old Aug 2, 2009 | 04:48 PM
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The fact of the matter is that HP loss through the drive train is not linear. The faster the engine revs, the less loss through the drive. Consult your local Mechanical Engineer for further information.
That is all.
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Old Aug 2, 2009 | 04:56 PM
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Originally Posted by MLCZ51
440rwhp 401tq

how much hp is that at the crank???

My 07 Z06 stock was 436rwhp so based on that about 500hp
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Old Aug 2, 2009 | 09:35 PM
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Originally Posted by mvcrash
The fact of the matter is that HP loss through the drive train is not linear. The faster the engine revs, the less loss through the drive. Consult your local Mechanical Engineer for further information.
That is all.
I'm not a mech. engr., so what you say is probable true. We are not looking at drivetrain loss at 2000, or 3000 or 4000 rpm.The dyno tests we use to compare max hp and max tq and the max hp usually occurs in the 5500 rpm range for stock cars and 6000-6500 for cammed cars. Most all the cars in this forum are in this range, and the hp loss on the ls2, ls3 and ls7 at peak hp is approx. 55 for manuals and 65 for autos. These are dynojet numbers are it works out very close for n/a engines. Any comments are always welcome.
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Old Aug 2, 2009 | 09:40 PM
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Originally Posted by trapp
My 07 Z06 stock was 436rwhp so based on that about 500hp
Everyone pretty much agree on 500 crank. I know the z06 has good rwtq. numbers, do you happen to remember what yours was?
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Old Aug 3, 2009 | 02:03 PM
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Default Ccw drag pack added..

Originally Posted by Tony B4
Low-mid 11's....With a great driver and awesome weather, high 10's
10.98@128MPH.. 1.61 60FT. WAS THE BEST PASS...
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Old Aug 3, 2009 | 02:37 PM
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Originally Posted by MLCZ51
10.98@128MPH.. 1.61 60FT. WAS THE BEST PASS...
Very nice run. Great trap speed and the 10's must make you "FEEL PROUD".
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