Just finished installing my UEGO and did a few WOT runs in 2nd and 3rd, up to 6500rpm. My AFR was low 11's, I currently have GM Stage 2 with 2.9. I'll be putting my Stage 3 PCM in tomorrow, and ideas what AFR I should see? What are you guys with GM Stage 3 seeing? Also does anyone know if the UEGO sort of breaks in and the numbers stop going from 12 to 17 when not on the pedal that much? Or does that always do it.

 

my stage 1 tune was fat on the dyno, sniffed at the tailpipe...like 10.0 and fatter...lol.

 

AFR never stays constant. it always pulses rich to lean, rich to lean. its an emissions thing to control hydrocarbons, carbon monixide, and NOx

 

Put the Stage 3 PCM in and got low 11's AFR at WOT in 2nd, however at 6k started to sputter. 3rd I got 11.8 and pulled nicely. I think someone previously mentioned they put their stock plugs back in. I think I'll do that and check again. Do these numbers sound about right?

 

For optimum cylinder pressures, keep afr variation between .1 when wot

 

im not talking about WOT, he said when at cruise. its an emissions thing

 

second bounced around between about .3 (10.9 and 11.2)and third stayed at 11.8.

 

My AFR slowly but steadily climbs during WOT, by about .4 or so. My tune is pretty conservative so at redline i'm at 11.2 or so depending on weather. 11.8 is perfect and safe. If it gets in the mid 12's or higher then you have a problem.