For some reason I cannot get a consistent afr when in boost. Most of the time when I go WOT, i get 11.4-11.7 afr all the way throughout the rpm range which is what i am shooting for. But sometimes I go WOT and I get mid 12's. I obviously don't stay in it long to see if it drops where it should be, but long enough to guess that it won't. Anyone have this problem before?

PS. I am running 1 bar maf with a 3.2 pulley and about 5-5.5 psi and not using nitrous when it does this, and is not related to weather or temperature.

 

you need to monitor your fuel pressure.

 

I have a gauge and it stays pretty consistent. It drops 2-3 lbs on the top end, but it does it every time and is not correlated with the changing afr

 

Might be time to go 2-bar.

 

Do you use HP Tuners?

 

Yeah, i suppose its getting to that point..

Yes, I use HPT

 

Maybe when you are rich (the 11's you see) your LTFT's are adding fuel. Then the times you get 12's the LTFT aren't adding fuel. Meaning if you turned off the trims you'd be in the 12's. If you are in closed loop and you have positive fuel trims the pcm will add that to your PE table. Long story short...since you are 1bar, have you tuned the VE and MAF's? Tune the hell out of that thing in open loop. Get the AFR's where you want them. This way if you have positive LTFT's then you'll just be richer than your base instead of 12's. IF that's the issue.

 

So post a scan and tune.

 

This.

I also dont ever use long term fuel trims. My tune is close enough that I dont need them, and they only make things more complicated for me.

 

Yeah, I'm not too confident tuning with this blower, I got a tune from justin, but I think its tough to tune a unique forced induction setup via the mail, hopefully I can meet up with him if he makes his trip out here to MN. There really is not any good tuners anywhere near me that I know of, anybody know of any?