Checked boost pressure today.
My calculations were 100% correct
Sea level pressure 1019hpa
5300 ft pressure 839hpa (this can be worked out for any altitude)
The percentage of air pressure at 5300ft compared to sea level is *
derived by 839/1019 = 0,82
I lose 18% at my altitude.
This is the ratio you must apply to the boost a pulley generates at *
6 psi x 0,82 = 4,92 psi
On my runs with the boost gauge connected, the maximum recorded boost *
was 0,33 bar = 4,78 psi
This proves my theory beautifully.
7 psi x 0,82 = 5,7 psi
7,5psi x 0,82 = 6,1 psi
Based on what we saw with the 95mm pulley boosting at the bottom of *
the 6-6,5 range, I believe the 92mm will boost at 7
808E90 (Ricky) dynoed at 440HP with 4,5psi and he had full ericsson *
Mine dynoed at 443 HP with 4,78 psi, and i have a full akrapovic. *
Therefore on a SC, power is directly proportional to amount of boost, *
regardless of altitude, making the effective delta gains compared to **
stock car, much higher at altitude