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Formula? Boost vs HP gain??

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Formula? Boost vs HP gain??

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Old

Sep 30, 2006 | 11:12 AM

#1

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Formula? Boost vs HP gain??

Is there such a formula?

Thanks

Old

Sep 30, 2006 | 11:28 AM

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This might help assuming your air/fuel ratio is correct..

http://users.erols.com/srweiss/calchpb.htm

Old

Sep 30, 2006 | 01:36 PM

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We did alot of dyno testing on a 377 single turbo at everything from 3.5 to 18 psi boost. The power was remarkably close to NAhp*(14.7+boost)/14.7.

Mike

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Sep 30, 2006 | 02:34 PM

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Hmmm. Interesting link and calculator.

Old

Oct 1, 2006 | 10:23 AM

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Thanks very much!!

Old

Oct 1, 2006 | 11:18 AM

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I plugged in some stuff using 375 crank na hp for the engine parts and the results were anywhere from 930 to 1100 hp.

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Oct 1, 2006 | 12:54 PM

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I started with 450 N/A and it shows 1000 hp at about 18 psi. I put 430 rwhp to the wheels N/A with 11:1, now I have 8:1, I wonder how much power I lost? Should be close I think.

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Old

Oct 1, 2006 | 01:47 PM

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I punched in my numbers and the results were "about" what I expected. Guess proof will be on the dyno when all is said and done.

Yup,, you can just add boost to the formula and HP sky rockets!!

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Old

Oct 1, 2006 | 01:56 PM

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well, i know when we play with the vipers it's usally about 30rwhp per # of boost. this works out pretty good. I would think that the displacement would have something to do with that though so maybe 25rw/#?

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Oct 1, 2006 | 07:31 PM

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Quote:

Originally Posted by nitrorocket

I started with 450 N/A and it shows 1000 hp at about 18 psi. I put 430 rwhp to the wheels N/A with 11:1, now I have 8:1, I wonder how much power I lost? Should be close I think.

I've seen a pretty consistent 5% power gain/loss for every full point of compression change. So, dropping from 11 to 8, nets you a 15% loss. That's about 365 rwhp at 8/1.

Mike

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Oct 2, 2006 | 01:13 PM

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I was figuring 400 crank hp for my longblock (at the most). Might be as low as 375 crank hp but I'm thinking 350rwhp.

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