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| Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series. |
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10-10-2014, 03:34 PM
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#1 |
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S15 afc neo issue
Having a issue with what seems fuel cut or some type of limiter.
In 3rd gear 4000-4500 12-14psi 12 afr thens cuts fuel seems like Cars 99 s15 stock turbo and injectors. Turboback, fmic and piping, non recric bov , aem wideband,greddy boost controller,255 fuel pump, z32 fuel filter. Never had this issue before installed neo this weekend. Afc neo with boomslang harness. 5/5 maf settings. |
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10-10-2014, 05:39 PM
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#2 |
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Post Whore!
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The SAFC is your issue... Get rid of it and buy a Rom tune or tuneable ECU if you plan on modifying and retaining any reliability.
__________________
My SR20VET |
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10-12-2014, 03:39 AM
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#3 |
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Post Whore!
 
Join Date: Jul 2005
Location: South Florida
Age: 38
Posts: 4,649
Trader Rating: (17)
  Feedback Score: 17 reviews
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You've run out of maf voltage. the safc is able to adjust fuel up by adding maf voltage. If you max the maf voltage, the ECU cuts fuel.
You need a stand-alone and a larger maf, and/or, larger injectors. the larger injectors will lower the maf voltage that the ECU will see, thereby side stepping your current issue (fuel cut). However, by lowering maf voltage to avoid the fuel cut, you will be telling the ECU that the engine is under less load, and to add more timing. enough timing to ruin your engine, thereby giving the safc the bad reputation it deserves. |
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