PSI is gage pressure the manifold and engine know absolute pressure. One
atmosphere is around 14.7 psi abs + 10 lbs boost = 24.7 abs
If atmosphere is 12.5 psi abs the with 10 psi boost you only have 22.5 psi
abs..If the engine will live at 24.7 abs the only way to get back the
performance is to add boost and keep all the units in abs reference..
Dave
Skip Higginbotham wrote:
>
When
> is 10 psi not 10 psi?
> I guess we need more boost to make the total manifold pressure get back
> where it was at sea level (or other density altitude when the wastegate was
> set). If all that is true....the hp should be 675 and the total manifold
> pressure and pressure on the head gaskets should be the same as on the
> dyno.....I think......
> Skip
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