11-19-2013, 12:17 AM
Join Date: Mar 2006
Location: San Diego, CA
Total Cats: 1
listed different boost setups
on the 6-Rib hotsides. At 15psi, he required the 140mm/65mm combo which yields a pulley ratio of 2.15
To approximately match that pulley ratio (2.14) with a 150mm Crank Pulley, you need something around the 70mm SC pulley.
As a counter point, Trikchop
posted getting 14psi with the 150mm Overlay pulley and a 62.5mm SC pulley
, yielding a ratio of 2.4
. If you do the math on FormerDatsun510Man's table, you go up 1psi each time the pulley ratio goes up by an additional 0.07. So why did Trikchop's flatline at 14, when other MP62s have yielded more boost with lower ratios? Could be a number of factors (altitude/IC/TB restrictions), but the immediate issue that jumps out is anything smaller than a 65mm pulley, non-autotensioned, 4-rib typically is prone to belt slip.
Last edited by RunninOnEmpty; 11-19-2013 at 12:28 AM.
Reason: Trikchop's psi was 14, not 15 (typo)