Quote:
Originally Posted by cjperformance
While I'm waiting for the PI kit to ship... let's talk boost and pulleys.
In order to raise average boost, as a side effect, I'll be raising peak boost too.
What's a safe average and peak boost for SBE? If I wanted to target 10 psi average, I'm thinking that might be around 12 psi peak.
I'm also thinking I'll be in the neighborhood of a 3.7" pulley, and can play with shift points to tweak to something safe.
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depends on your lower.... there are two different sizes for our cars. 7.65" and 8.25"
after that, you can play around with the procharger rpm calculator found here:
https://www.procharger.com/supercharger-calculators/
additional note: the general rule of thumb is that every 0.1 change in pulley size on the upper will equal ~ 1 psi. that is again a rule of thumb.
I ran a 3.9 upper and 8.25 lower and had ~10 psi in a fairly free flowing FBO engine. Results are in signature.