O2 reading

[Budget90GST]

Hello everybody! I'm new here but I've had my car now for a little over a year. I have a 90 GST with a few mods. I've yet to figure out how to update my profile so I'll just list some of my mods related to my question.

1990 GST

MMCD logger on M130
MAFT 2.01 (3 in GM sensor drawthrough set-up)
560's from EVO 8
190 LPH
MBC set at 16 psi
2.5 turbo back
14b

It's tuned pretty decent but I just noticed that my O2-R never read higher than 0.72. Even when it was fairly stock (had some logs from back when I was still fairly stock) it never read past 0.72. I always tune for knock so I never really noticed till today, and looking back at all my logs made me realized this. Anybody had this happened to them. Thanks in advance!

Ben

 

[94TalonKid]

That seems pretty lean, you have no knock with that O2? What do your fuel trims look like?

 

[dave99gst]

unless its a lazy o2 ? sounds lean to me also.

 

[Budget90GST]

That's what puzzles me. My trims are 95, 92, and 98. I get maybe 5 or 6 knocks but only after heatsoaking my stock sidemount. I usually don't get any knocks on the first run when the intercooler is still cool.


Just for archiving purposes I want to add that my FPR solenoid was bad therefore leaning my o2's under boost. Bypassed it as per member post (I searched) and it fixed my problem. Thanks.