Project Pipedream is alive, but I need tuning help

Another MkIII

Member
Feb 22, 2009
697
0
16
Chicago
As far as working on cars and doing repairs, I'm competent, but when it comes to actual tuning and modifying stuff of that nature, I'm still a bit of a noob. Basically, I am curious as to what a safe Air Fuel Ratio is for my MkIII. I'm running the following setup:
-1987 Supra Turbo Manual
-Stock turbo, about 7-9 PSI
-Lexus AFM
-Walbro 255LPH Pump
-RC 550cc Injectors
-Aeromotive AFPR
-AEM Wideband gauge
Basically, I am trying to get an idea of where my A/F should be at idle, WOT, half throttle, decel, etc. Also, I want to know roughly where it should be on and off boost. Like I said, I'm new to tuning, so any help is appreciated.
-AM3
 

Another MkIII

Member
Feb 22, 2009
697
0
16
Chicago
UPDATE:
I currently have the set screw on the AFM all the way open, and I'm running 30 PSI. It idles at about 14.5, but under heavy loads its running about 10.5:1 or less, and at WOT, it goes from about 9:1 until it bottoms out the gauge at 8.5:1. Is there anything else I can do to adjust my AFR or is the next step is to find a piggyback ECU?

I'm curious as to what would work best with my setup. The two I would consider (if I need to go with a piggyback) are the MAFT pro, and the Apex AFC. I'm just curious as to the specifics of installing and setting up each of them.
-AM3