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I have had the 3900 running for a while and recently switched to a 4speed manual. I had it tuned a couple times by different people and after that raised compression with thinner head gaskets and changed up the exhaust a little. I then got an apu1 and started tuning myself. I sent Superdave a copy of the bin and he graciously modified the timing tables for me. The car was still lean and had some hesitations and I worked around that. Now, I'm new to tuning so I went back and added my old spark table but blended it down to superdaves table in the 90-100kpa ranges plus two degrees. I took it out for a drive and the car feels good with no KR. The afr is 12.2:1 at full throttle. So now the question is do I do anything or leave it alone? It seems like leaning it out could add power but I thought I remember reading here that these engines like fuel. Any advise is appreciated on what to do next or call it good and take it to the track.
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lean it a bit, push on it, see if it feels better. if it does, do it again, if not, go backwards, or go even richer, see how it feels. -
I dropped the BPC 2 points and took it for a spin. Engine cool the afr was low to mid 13's. As the engine got closer to 180* the afr was back to 12.2. It could be dependent on which gear I was in and if I was full throttle through multiple hears, I don't know. I didn't see anything dangerous afr wise or KR so I think I'll have to leave it and see what it does at the track. Thanks for the help.Originally posted by robertisaar View PostComment
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you'll want to change the commanded PE AFR, not by adjusting the BPC, since that effects global fueling, not just PE.Comment
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That whole table is set to 12.8.Comment
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if you want more or less fuel only in PE/WOT, that's the table to play with. ideally, that table should match your wideband readings in PE, assuming your target AFR doesn't deviate due to cat overtemp or anything else.Comment
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