Thread: Odd AFR issue
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WERK I WERK I is offline
Forced Induction Junkie
WERK I's Avatar
Join Date: Jan 2003
Location: Wisconsin
Posts: 3,291
Are you tuning your CIS to pass emissions tests or just optimizing the CIS system for best driveability? When I lived in the Northeast, getting the CIS engines to pass the "sniffer" test, was an effort in futility. The only way it would pass if I added a cat and tuned it slightly rich. Tuning it to stoich at idle, these engines run like crap under any kind of load. Also, any gasoline blends (10-15% E) out there will affect the ideal stoich value.
Maybe these charts will help in tuning.

btw, I've been using an '87 930 WUR with great results. The WUR's for the '78-86 era 930's are getting very hard to come by. If you find one, the cost would be very high compared to other WUR's.

'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 04-06-2010, 08:19 AM
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