bumping this....... i have a TIAL right now that i got used locally from one of the honda boys, and i'm thinking i need a different spring because i do get compressor surge when letting off at part throttle. looks like jesses240 was getting this same issue with the 11psi spring, would the 9psi spring be the one to use? fwiw my defi shows the vac @ 20 at idle
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