03-12-2010, 07:31 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
Wide Band O2 Question
I watched a video where the engine was off and cold. A wide band was in the exhaust with a gauge mounted in the car. The AFR was pegged at 19%, as the exhaust was full of air. Makes sense so far.
They started the engine and within 3 seconds it was reading. It was jumping around and they claimed fuel dopping out, at different cylinders, in the manifold, was the cause. This smoothed out as the engine warmed up.
Ok I know narrow band O2 sensors have to warm up, before they read. Can a wide band actually read instantly when cold?
I also read that the wide bands are slow to respond and that is why the factory uses narrow band sensor. This video claimed that it was fast enough to respond to different cylinders at a high idle. At 1200 rpm or 20 rev/second times 4 cylinder firing every rev, that is 80 bangs in a second. Just how fast can they respond?
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