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Old 09-29-2004, 10:02 PM   #1
snookem
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Member#: 11438
Join Date: Oct 2001
Default How do you target A/F's to fuel and timing

Could someone direct me in how you road tune A/F's on a Subaru motor that optimises A/F's for different octanes and boost when your in the 50% and above load zones. I understand the 10% to 50% spool the turbo A/F's and ST/LT trims etc. I also understand timing though load zones and max torque plus EGT's.

Let me explain some more.
If you have engine management ie Link, UTEC, Hydra etc and you start with a base MAP on a modified engine with say 9.0 compression that is 2.4 liters. The A/F's are a conservative 10.0.

What determines the optimum A/F's for octane, timing and boost on any Subaru turbo motor. What are the steps need to get there.

Most say on a WRX that 10.8 A/F's on 93 octane is OK. STI tuners I've talked with say you can have 11.2 A/F's to 5k and 11.6 A/F's from 5K up on 93.

I have seen maps built for 91 octane with 22 psi and maximum 10.5 A/F's for STI's.

I wish to build a track day(circuit reliable) tune.
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