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Kingtal0n · 12-13-2022, 08:29 AM

Get an AEM wideband without stupid calibration.
A difference of .5AFR is negligible if the reading is in the 11's any 11 is fine
I've seen some sr20 stock ECU run 12.5 in the boost
Replace the knock sensor, check the timing, basic maintenance.
Very unlikely maf is bad. Could be dirty but rarely they go bad.

They do get old though and that seems to influence more than anything.

I tried 5x different mafs once and all of the give difference AFR at wide open throttle.
only real way to control is to use a stand-alone like Power FC

make sure maf is installed right, no air leaking around it, straight tubes in front and back. Recirculated bypass dumping after the maf. If there is open blow-off or if the blow-off closes prematurely or at low rpm the backflow into the maf will cause problems.

12-13-2022, 08:29 AM	#3
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 41 Posts: 4,828 Trader Rating: (17)	Get an AEM wideband without stupid calibration. A difference of .5AFR is negligible if the reading is in the 11's any 11 is fine I've seen some sr20 stock ECU run 12.5 in the boost Replace the knock sensor, check the timing, basic maintenance. Very unlikely maf is bad. Could be dirty but rarely they go bad. They do get old though and that seems to influence more than anything. I tried 5x different mafs once and all of the give difference AFR at wide open throttle. only real way to control is to use a stand-alone like Power FC make sure maf is installed right, no air leaking around it, straight tubes in front and back. Recirculated bypass dumping after the maf. If there is open blow-off or if the blow-off closes prematurely or at low rpm the backflow into the maf will cause problems.