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Old 11-12-2011, 09:51 PM
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Flywheel hp?

I am building a street/strip chevelle. Mainly street, but my question is my motor has been dynoed at 652hp and 622tq at the flywheel. I am about to install it into the car soon. I'm trying to decide what all upgrades I need to do most important upgrades first because of the money flow fading away. I'm upgrading the slip yoke, drive shaft, joints. And Im trying to decide on what degree to go on my rear end. Car profile is 496 with a turbo 400 / 3,500 stall / 12 bolt rear end with 4:10's and an eaton posi unit. Now for my question to estimate my rear wheel hp I was told to subtract about 17% from the total hp. Doing the math I come up with around 540hp rwhp. I know there are several factors that come into play, and eventually I'll get the car dynoed to know for sure, but I'm just looking for the best rough estimate to decide what upgrades I need to do to the rear right now. For now the less I need to do the better. I've got to get the money pile back up. Is this a good rough estimate?

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Old 11-26-2011, 11:44 AM
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I'm not an expert but that sounds close. I just always figure on losing about a 100 hp.
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Old 11-26-2011, 07:53 PM
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I think a lot of it has to do with the design of the drivetrain. Seems to me that a stick transmission would be more efficient than an automatic. You may see many different estimates of power loss, but using 25% with an AT system, you would multiply your flywheel horsepower times .75 If you had a 20% loss in the system, then you'd multiply the flywheel horsepower times .8
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