Does LT Headers Affect the AFR?
back pressure doesnt allow the engine to fully exhale the exhaust gass. when you put the headers on it allows the engine to fully exhale, which allows the cylinder to fill with more clean air. its going to pull in a little extra air, but the computer will not fully adjust. besides the maf does not know how much air is entering each cylinder.
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The Maf will know that there is more air and give you mare fuel. Most people get rid of the cats. You then delete COT. Once you do that then can get the trims to lock at zero at PE. Once you do that you can set the A/f ratio. The tune from GM is rich.
It should remain the same. It will be pig rich at PE. Trims will keep it 14.7 when not PE.
It should remain the same. It will be pig rich at PE. Trims will keep it 14.7 when not PE.
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I always thought that long tubes affected AFR because of the O2s being moved further downstream, NOT because of flow differences, because the MAF should pick up the flow difference.