Quote:
Originally posted by antero
I think Innovator is on to something. The Talon community already can increase their injectors 22% bigger (450cc->550cc) without adding unwanted timing advance. How? They swap out their 1G MAF to a 2G MAF which incidently flows 22% more. The ECU is unaware that the injectors are making the car rich by that 22% factor. And again, the ECU is unaware that the 2G MAF is making the car run 22% leaner. Overall, it's a nice coincidence that doesn't require a "fuel computer".
Now, here's something that would make a great project. Take a spare 3S MAF and hollow it out 100% and retrofit a 3" GM MAF combined with a MAFT. The ECU would only see the air measured in the 3" chamber. The remaining air passages would be "unseen" by the ECU and could be used to offset the over richness caused by the larger injectors. The overall correction factor used on the MAFT or SAFC will be much less and won't lie as much to the ECU. The net result is the ECU won't advance the timing as agressively as before.
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Your AFC setting seem very rich. I have a similar setup, and with the FJO, I'm closer to -30 LO across the board, and -30 from 1K to 4K, and -39-39 above on Hi. You may be leaving a bunch of HP on the table... I was still on the rich side there. Now all has changed with the gutted MAF.