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WERK I WERK I is offline
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Join Date: Jan 2003
Location: Wisconsin
Posts: 3,291
Originally Posted by Ben V View Post
Does anybody have any ideas?

I have a 964 turbo with full custom exhaust system no cat, Turbosmart 48mm wastegate, KN air filter, K27 7200 hi flow, hi/lo boost control ie standard .7bar and 1 bar.

I think the engine is detonating under boost, very very mildly on low boost .7bar if non at all, but at 1bar high boost distintive tinkle (like coins rattling in the ashtray)
I am pretty sure it is detonation so needless to say I am not allowing it to boost until I reslove the problem!

My thoughts are possible injector problems (semi blocked) or ignition system retard?
It very well could be an ignition problem. Check your static, total advance and advance under boost.
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 11-02-2009, 08:05 AM
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