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David David is offline
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Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,690
This is such a huge power loss that this has to be something major and therefore obvious... I think. So don't be offended by questions that seem rather obvious .

When the top end was apart and the intake and exhaust off, did you find anything strange?

If everything seems mechanically correct and there are no restrictions in or out of the engine, I'm leaning toward cam or ignition timing issue. Are your spark plugs all the same color? I had different color plug readings left to right and turned out to be the cam timing was off. Have you checked ignition timing with a timing light?

How about some pictures of the engine in case that brings up any questions.
2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)
Old 11-11-2007, 12:45 AM
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