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Registered
Join Date: Nov 2002
Location: Los Angeles
Posts: 729
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Carrera cam on a 1989 930
I talked to the engine rebuilder in my Porsche shop. He mentioned if you put a "Carrera cam" in a 1989 930 along with after market exhaust to shorten the turbo exhaust route, you can increase the hps to 300+ with no turbo lag? What is "Carrera cam"? Is he right about the result?
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Caliber 1987 911 Cabriolet |
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04-11-2004, 07:24 PM
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Cymru am Byth
Join Date: Apr 2002
Location: Salem, Oregon.
Posts: 571
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He probably means the SC cam, this is a common mod to help to increase the low down, off boost performance in the 930.
The 964 cam is also used but I think this works best in the mid and upper range. It will take more than the exhaust and cam to eliminate turbo lag completely, i.e. quick spool turbo, headers etc.
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1986 930 (Gone but not forgotten) 1995 993 (Should Never Have Sold it) 2007 BMW 328Xi Sport Wagon 2005 Lexus GX470 Offroader Julian Williams |
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04-12-2004, 03:24 AM
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Join Date: Jul 2002
Location: Atlanta
Posts: 7,125
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The SC cam has almost zero over lap (CIS does not like the reversion impulses up the intake) so no turbo boost is blown out the exhaust before the valve closes. This is similar to how modern High Performance turbo cams are designed. I dont know much about Turbos but I would think the SC cam would be better than the Carrera or 964 cam - could be wrong though? I believe the later cams both have a little over lap.
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erik.lombard@gmail.com 1994 Lotus Esprit S4 - interesting! 84 lime green back date (LWB 911R) SOLD  RSR look hot rod, based on 75' SOLD 73 911t 3.0SC Hot rod Gulf Blue - Sold. |
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04-12-2004, 04:03 AM
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Join Date: Apr 2004
Location: YL
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04-12-2004, 06:11 AM
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Registered
Join Date: Apr 2003
Location: Maitland, Florida
Posts: 892
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Correct, the only difference in SC and Carrera cam timing is how they are indexed. The early US model SC's used the Carrera 3.0 timing. Post US 80 models advanced the timing a bit (Like Euro models from 78-80), 81-83 Euro SC's reverted to Carrera 3.0 timing and the 3.2's just split the difference.
Regards, Jerry Kroeger
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82 911SC Targa (05 Boxster S ) gone, but not forgotten 87 Suzuki GSXR-1100 1953 MG TD Mk II |
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04-12-2004, 07:36 AM
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