I have been using my wideband to adjust my AFR and I wanted some feedback on the following log. This was a third gear run from 2000 RPM WOT to little over 7600 RPM, on 93 octane, and just under 20 PSI.

RPM AFR
2300 14.5
3000 13.4
3700 12.6
4400 12.3
5100 12.4
6000 12.2
6600 11.7
7100 11.9
7600 11.9

My mods are in my sig.

 

looks pretty good, except you might want to fatten it up just a tad at redline. 11.5 is a good, safe place to be at high rpms. looks good down low though.

 

That's leaner than I'd feel comfortable with unless you are running race gas, especially since according to your sig you are running stock ECU programming with an SAFC and big injectors. That means that your timing must be really really advanced from stock on top of the much leaner AFRs and additional boost.

 

That looks lean to me, you want to target between 11.1-11.5 for daily pump. Just the rule I usually stick too. You do want to trail down if you can that way to don't get your AFR's dipping below what you want.

 

You know that the less the number the richer you are ! 14.5 is very lean, 9 is very rich

 

11.1-11.3 for good longevity RRR

 

Wow, that is dangerous lean for pump gas IMO.

 

Thanks for the feedback.

 

Here is my latest log file attached. I have it more in the low 11's, but not sure what other people have for slope?

RPM AFR
2700 13.19
3000 12.55
3500 12.10
4000 11.66
4500 11.82
5000 11.80
5500 11.38
6000 11.36
6500 11.35
7000 11.05
7500 11.05
7700 11.20

I have smoothed out the 4500-5000 to more around 11.5 since this log.

 

this one is a little better. mine is at 11.2 at the leanest @ 22.5 psi. i have more in my fuel system though. you need a fuel rail and fpr if your ganna run that lean... what your seeing is a "wholistic" AFR so-to-speak beacuse your sensor is down stream and the gasses from each cylinder mix together to show your readings. all cylinders never will run exactly the same fuel mixture and unless you have a fully built fuel setup you have no way of knowing what each individual cylinder is doing. now im not going to run 4 sensors, one after each port so what i do is account for that mixture in my tuning.