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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So with my stock balancer (7.65) and 3.7 upper on my sbe I was at 12psi at 6700 rpm on a 75* plus day. Colder temps would see 13psi plus.
8.25 pulley and 3.7 upper on forged, cam, ported heads was making 13.5 psi in summer and 15 psi in sub 60* temps at 6800 rpm, if I take it to 7-7200 I gain almost 1.25 psi.