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Old 11-03-2019, 06:55 PM
19963.4lsr5 19963.4lsr5 is offline
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19963.4lsr5 19963.4lsr5 is offline
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Target Air Fuel Ratio for ScanGauge in my 97.

Quote:
Originally Posted by Black798 View Post
Prior to I beleive 1999 Toyota used narrowband o2 sensors in all the 4runners. These sensors don't understand afr they only read on a 0 to 1v scale that is either rich or lean. I have an AEM afr gauge installed in my truck and I hit 14.7 afr almost immediately after startup and it hovers there untill my tune takes over in boost. Not really understanding the purpose of having a "target afr" reading on the scangauge. Also attached a graph showing how narrowband o2s read


I found it and put it on the ScanGauge to see if it behaved like my saturns. Stoch on a 0-1v Sensor is .50v. But it’s not near as accurate as a wide band and you need a a way to average the high and low swing to see what the AF Ratio is.

Tuning with a narrow band in the 90’s before wide band sensors and displays became available I shot for .4v to .5v in cruise mode and .92v at wide open throttle.


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Last edited by 19963.4lsr5; 11-03-2019 at 06:59 PM.
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