2005 GMC 6.0L with LS9 Cam and Supercharger. only 4psi of boost.
i have upgraded to a 2 bar speed density tune.
the truck from 3,000 rpm to 4.000 rpm will run at a AFR of 13.8-15 no matter what i do. i have maxed out the areas in the maf and ve and have added way to much fuel in the power enrichment and nothing helps. As soon as it hits 4,000 rpm the afr drops down to 11.5 ish and is fine after that.
any one have any ideas?
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