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Old 11-28-2012, 05:21 PM   #1
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what should my AFR be at idle

finally got my gauge in and now wondering what it should be at idle?
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Old 11-28-2012, 05:39 PM   #2
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Between 14.5 and 14.9.
14.7 is perfect.
But it would depend on the combo.But these are popular numbers for the average car.
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Old 11-28-2012, 05:39 PM   #3
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around stoich which is 14.7 for gas. if its digital it may bounce around some but should avg out to about 14.7
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Old 11-28-2012, 05:46 PM   #4
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thanks
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Old 11-28-2012, 05:53 PM   #5
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sorry to be so clueless but at WOT what is the least it can go.
thought i read 12?
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Old 11-28-2012, 06:41 PM   #6
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Quote:
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sorry to be so clueless but at WOT what is the least it can go.
thought i read 12?
12 is ok , with a supercharger you want to be a little rich for safety.
Lower is not a real problem , its high numbers which means leaner , that would be trouble.
I think you need wide band sensor to be accurate when going very far beyond the 14.7 number in either direction
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Old 11-28-2012, 07:32 PM   #7
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I would suggest between 11.0-11.5 AFR.
Some push it to 11.8
I would be scared running it at 12.0
These numbers are for force induction numbers.
Been running 11.2-11.5 AFR with a TVS in my Avalanche for 2-3 years now.Works perfect.
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Old 11-29-2012, 11:25 AM   #8
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Quote:
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sorry to be so clueless but at WOT what is the least it can go.
thought i read 12?

Just don't go into the 10's very much or for very long. It is bad for cylinder lubrication to go too low. Stay above 11.0 and all is happy. Most like 11.5.
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Old 11-29-2012, 11:25 PM   #9
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around stoich which is 14.7 for gas. if its digital it may bounce around some but should avg out to about 14.7
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Old 04-04-2013, 10:52 PM   #10
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What should it be cruising on highway? Say 6 gear maintaining 70 mph about 1750 rpm steady.
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Old 04-04-2013, 11:02 PM   #11
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I'm between 12 and 11.6 throughtout a wide open pull
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Old 04-04-2013, 11:08 PM   #12
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I want to know just cruising
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Old 04-05-2013, 08:01 PM   #13
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Quote:
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I want to know just cruising
Between 14 and 15 it will bounce around depending on throttle. Don't watch it too much. When you nail it it should stop bouncing and stand still around 11.5.
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Old 04-05-2013, 09:03 PM   #14
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If your sensor is behind the cats it will be very steady and in the mid 14's. if it is in front of the cats it will oscillate, and you will see upper 13's to mid 15's. These are part throttle numbers of course. Sensor needs to be in front of cats to be accurate.
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