Whp vs. Engine hp?

Econ

Bhp = whp*(1+.17)

Whp = bhp*(1-.17)

Estimation Obvsiously. Its not perfect.

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onzedge

Must be that "New Math".

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Dizon248

You can't do that. When you use the 17% drive train lost, you can't convert back up 17%, you are using a different baseline and it will give you a different value.

So Whp = bhp*(1-.17) is right, but when you do Bhp = whp*(1+.17) you are multiplying by a different baseline. Try it. Say I have 300bhp and I multiply that by (1-0.17), I get 249. Now use 249 to multiply by 1.17, you get 291.33. You just lost 9HP from converting like that.

The right way is this, Whp = bhp*(1-0.17), solve for bhp now. bhp = whp/(1-0.17).

Summary

Whp = bhp*(1-0.17)

bhp = whp / (1-0.17)

4r3s

This as far as math equations go is correct, as far as the specific problem I can't say how accurate the equation is. The previous posts were really bothering me, yes, I am an engineer....

Dizon248

Yeap, I'm still trying to figure out what's up with the OP's post. 19bhp difference between the NISMO and the normal edition. The OP said people slapped on a NISMO exhaust onto the normal editions and only got 5whp. NISMO edition =/= normal + NISMO exhaust. NISMO edition probably has a tuned engine too to boost that bhp figure to 350.

The reason why I say that the NISMO editon =/= normal + NISMO exhaust is because 19bhp =/= 5whp. No way in f'ing hell.