ok, i have my LTrims pretty much set to 0 or a little - (max of about -3) and I am going to attempt to tune my o2's by modding the PE vs. RPM table. Does anyone know what o2 numbers are good for the 3.8 s/c motor? I have looked around and found lots of F body stuff but nothing for mine. thanks.
~Mike
97 GTP coupe... slowly becoming hptuned, pem's, 3.4 pulley, rt dp, borla cat back, thrasher cai, and some homemade stuff
71 GTO
400, 4 spd
03 n2o Firecat
asphalt sled on spray
Disclaimer: The factory O2 is a narrow band sensor, it may or may not be accurate at WOT.
That being said, I've found they are fairly close on mine (correlating to a Wideband).
Some sample O2 numbers:
Stock: 920-960 (varies on model)
For modded, non-Intercooled: 920-940 seems to be a good range.
For intercooled: 890-910 or so.
Let KR be your guide. Essentially you want as much timing as possible with your boost level, and look for O2s in good range with little KR.
Too much fuel 950+ can cause kr and rob power. Too little and you go lean and will spike KR and possible go boom.
Bottom line 920-940 is good range unless you are intercooled.
2017 Chevrolet SS, Orange Blast Metallic, Rotofab CAI. Headers coming soon. Stock Tune for now
Previous Rides: 2008 G8 GT, 2004 GTO, 2004 GTP, 2002 TA
thanks, I have noticed mine anywhere from 970-980, so i dont have to bring them down too much.
Last edited by firecatGTP; 05-18-2007 at 05:42 PM.
~Mike
97 GTP coupe... slowly becoming hptuned, pem's, 3.4 pulley, rt dp, borla cat back, thrasher cai, and some homemade stuff
71 GTO
400, 4 spd
03 n2o Firecat
asphalt sled on spray
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