TwinTurbo.NET: Nissan 300ZX forum - Not based on bad experience. But base on simple math.
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Subject Not based on bad experience. But base on simple math.
     
Posted by sparkie on September 10, 2008 at 2:36 PM
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In Reply To Dyno error? Dyno runs was made back to back posted by timz on September 10, 2008 at 12:25 PM
     
Message The engine flow is formulated as such...

engine flow= displacement x rpm x (volumetric efficiency) x (pressure ratio)

Look at the equation for engine flow, nowhere it cares what turbos you use. It cares only about VE, displacement, rpm and PR. 14psi is 14psi. The only benefit of using a TD06 is better VE.

So if you dyno'ed at 14psi, or about 2PR, then the simple math does not match the output at 1PR and 3PR.

That means
at 0psi, your motor should output 339rwhp
at 14psi, as you said it made 678rwhp
at 28+psi(or 3PR), it should make closer to 1017rwhp than to 823.

But it made 823rwhp at 30psi, so you are saying it only picked up 145rwhp with 16 more psi (going from 14 to 30psi)?

The engine demand is a linear equation. Take the HP data at 14psi, you simply can not extrapolate at 30psi and at 0psi. Math does not lie.

So the only way a 3 liter engine dynoed 680rwhp at 14 psi is to rev to 13-14000rpm.

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