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patkeefe patkeefe is offline
one of the great unwashed
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Join Date: Apr 2004
Location: Ringwood, NJ
Posts: 2,850
I have early SC pistons in my 3.0. I think they're 8.5:1 CR. I have run 8 PSI boost, currently run 5 PSI, with CIS. No extra injector, stock SC fuel pump, but I have an IA fuel head, Brian Leask WUR, and water injection. The water injection allows me to approach virtually 100% intercooler efficiency, as well as being an anti-detonant. I also have DC-15 cams, which seem to work well.

With an SC engine running low to moderate boost, I see no advantage to using 7.xx:1 CR pistons. The car would be undriveable until the boost comes on. I start making positive manifold pressure at 2100 RPM, and the engine pulls pretty hard up to 7000.

Patrick E. Keefe
78 SC
01 Boxster
Old 08-22-2007, 07:35 PM
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