View Single Post
David David is online now
Registered User
David's Avatar
Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,694
Here's a chart from "Forced Induction Performance Tuning" by A. Graham Bell

98 RON is about what our 93 is.

The chart shows with a 60% efficient intercooler and 9.3 compression you could get away with about 9psi, but I'd knock off another point or two or three since it's an aircooled 2-valve motor. Be sure to data log your lambda numbers as you ease the engine up to speed.
2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)
Old 08-22-2007, 04:00 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)