Question about Afr's while idling
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Joined: Apr 2009
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From: Oakville, Ontario
Question about Afr's while idling
For a stock N/a car what are your afr's while idling I'm finding mine are about 10/11-1 which i believe is way too rich
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
That is richer than what you'd often want at WOT under some boost!
Stock ports should idle well in the high 13s without too much issue. With a working BAC valve (and why wouldn't you have such a thing?!) then into the 14s will be possible as the BAC will compensate if the idle starts to drop due to loads. I've found that counter to most advice, the rotary likes advance at idle...about 8-10 degrees on stock ports. I run about 15 degrees on my bridgeport and it idles well around 14:1.
Stock ports should idle well in the high 13s without too much issue. With a working BAC valve (and why wouldn't you have such a thing?!) then into the 14s will be possible as the BAC will compensate if the idle starts to drop due to loads. I've found that counter to most advice, the rotary likes advance at idle...about 8-10 degrees on stock ports. I run about 15 degrees on my bridgeport and it idles well around 14:1.
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
Oh, the stock ECU runs the engine fairly rich under idle. Around high 12s in most cases. The air injection from the air pump will make the O2 reading full lean though.
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