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Tuning & Engine Management EPROMS, ECU, MAF, knock, EGT, wideband, datalogging, fuel trims, etc. Read this Forum's Strict Guidelines.

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Old 07-16-2005, 04:38 PM   #1 (permalink)
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From: Eau Claire, Michigan
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Please help tune w/ 650's, Maf-T, S-AFCII

I know 650's are hard to tune w/ out a chip, but I've heard it can be done. Mods are 50 trim, Large FMIC, 255 HP pump, AFPR set to 42 psi, FIC 650's. Maf-translator V.2, S-AFCII.

Ill be honest, I know almost nothing about tuning, and I've read almost everything I can get my hands on. Basically Ive just been monitoring knock, fuel trims, and EGT guge. I set the Maf-T to 650cc injectors, and have been basically been playing around w/ the S-AFCII settings. The car is just running PIG ASS RICH. Could someone please help by telling what I need to be looking at on the logger, and maybe a basic starting safe point w/ the Maf-T and the Logger settings for 650's. Something so it wont run pig rich. I dont expect it to run top notch at all, just better than what it is now. Its like driving a Geo Metro. The worst bogging is about 2500-4500 rpm's. Also please no flaming. Ive read alot about tuning and it doesn't seem to help me. Would getting an Eprom chip w/ injector compensation for 650's help out tremendously, or more of last resort?
And Basically, what should my initial starting points be using BOTH the MAF-T and the S-AFCII? Or should I only be using one or the other?
Thanks, Dan


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93 GSX
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Last edited by project_tsi : 07-16-2005 at 05:47 PM.
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Old 07-17-2005, 08:59 PM   #2 (permalink)
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From: Phoenix, Arizona
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Alright you should look on your logger all the fuel trims. Adjust the BASE knob to keep the total trim between 80%-100% during steady state driving 35-45mph. If you wanna lean out the fuel curve set the AUX/BASE to a larger injector size. after you lean out the whole fuel curve you can add fuel where its needed. I personally just tuned everything with the MAFT. Try to keep your trims between 80-100%. Hope this helps a bit. good luck
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