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matty74 matty74 is offline
Eye of the Toiger
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Join Date: Oct 2005
Location: Sydney, Australia
Posts: 1,204
Turbo Charging 78 3.0 SC

I there,

I have a 3.0 SC motor 8.5:1 CR and one of my friends has an aftermarket turbo charing system that bolts stright on to CIS system and manifold.

the turbo has a banjo fitting for oil of the oil line were the chain tensioners get fed, the plumbing is all crome, and it has headers that feed into the the turbo, which he thinks is a Garrett 26, the guy he bought it of had it on a 3.0 and said it went hard.

There is only some minor mods to engine tin to get it to fit.

Now my question is do I need to lower CR for a bolt-on system or can I run a turbo on a stock SC with lower boost. The 3.3 Turbos have 7.7:1 CR so my engine is not to far of the mark in terms of CR.

What kind of grunt can I expect? I run a 915 box that has a wevo bearing retainer plate, so it's strong, my engine is new (recent complete re-build).

1973 911 RSR clone powered by 77 3.0 turbo
Old 11-21-2007, 01:08 AM
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