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Originally Posted by Warrtalon
Why do you say the ECU is going to give less timing due to being positive below 5k? Back when I was stock, I had +% below 5k, 0 at 5k, then -% above 5k. The result was less lean conditions before 5k, a quick dip to the timing trough at peak tq, then a quick increase in timing as the rpms increased. Now, I get a slow decrease to a much lower trough in the negatives, and then a very slow response back into the positive. I do have injectors and a fuel pump in mind for maximizing the utility of my S-AFC, but those will be my only additional mods as I try to stay stock-appearing and emissions legal.
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When it was stock there was a lot less air the ECU saw as compared to now with a turbo-back and MBC. The less air then, even with some positive correction equaled good timing. Now, with more air, it's hot, and the positive correction, it equals less timing. Bigger injectors (with their negative correction) will staighten things right out.
