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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 ayglass View Post
I'm thinking the O2 bung should go after the muffler anyway so that it doesn't get too hot. After all, when you stick a portable probe up there at the dyno it doesn't go more than a foot up the pipe. I would think dilution from the air at the exit wouldn't be a problem with a pipe that long.
O2 sensors are most effective when placed in the path of the hottest gases. That's why the 3-lead O2 sensors have a heater element two fire up the sensor. Too far down the exhaust path, you lose accuracy.
'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 11-02-2007, 08:34 AM
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