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need help tunning afc/vpc/keydiver combo

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illeffekt vr-4

15+ Year Contributor
315
3
Sep 26, 2004
NYC, New York
hey all, just want to say thanks in advance for any help provided.
old setup was afc/keydiver/2g maf
now i have afc/vpc/keydiver chip.

the vpc came with a 660 chip. the keydiver chip is set for 550's (i had denso 550's before).but since i put the vpc in the i had to subtract a lot from the afc just to get the fuel trims back on track. for idle i have it at -35% (before was at -15%) and even with that the fuel trims are in the low 80's which is still very rich IMO.

*should i have jeff reflash my chip for 660's?
*should i put back the 550's and use the stock VPC chip? i think this would probably be the best option for now just to see what happens.
*anyone else with the same setup that could tell me their rough settings for the VPC?



my setup:
B16g running 20psi, denso 660's, rewired 255hp walbro, Aeromotive fpr set at 37psi, FMIC, external tial 40mm, 2.5" exhaust.
 
I like your second idea the best. It's free and it should tell you if the mismatched chips is giving you a hard time. If it does help with your tuning problems then get the chip modified for 660's and leave the stock chip in the vpc.
 
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