05-30-2018, 11:45 AM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
If it is hunting at idle, you may be running lean for what your motor wants. Most of these big motors like a fairly rich idle. My 408 is best at 13.5. I don't know how the Sniper system works, but if it is anything like the terminator, you can go into the AFR table and set the idle area and surrounding cells to 13.5. Make sure your timing is set to be stable in those cells as well. You can actually set the lower rpm cells to have more timing to help push the rpms back up.
Then go to your fuel table, give the idle area about a 5-10% increase, smooth everything out, then test it. Make sure you are warmed up and in closed loop mode and watch what the learn table does.
I ditched the EFI and went back to carb. Took a while to get that tuned but all is well now. Sometimes I consider going back to EFI but had such a colossal failure at it the first time, I am just gonna stay with what works.
Last edited by Texasdoc; 05-30-2018 at 12:13 PM..
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