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Thread: 1985 corvette needs tuning advice

  1. #1
    Carb and Points!
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    Nov 2012
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    1985 corvette needs tuning advice

    Here'swhat I'm working with: 1227165 ECU from a 87 Vet, Moates APU1, ARAPbin file, 6E xdf, and a AEM wide band gauge. 383 all forge rotatingassembly, Comp Cam 288HR int 236/ exh 242, Valve Lift int 554/ exh576, Lobe Sep 110*, Intake centerline 106*, Mini Ram intake, 58mm TB,30lb injectors, 1.6 RR,

    I have a 1985 Corvette with a 383 I'm trying to tune.I've been through two mail order tunes which were disappointing. SoI'm learning to tune my car myself. My plan of attack has been tostart tuning the fueling in open loop first, next to tune the fuelingin closed loop, then go on to timing. I have some questions. Whentuning in closed loop should I be making fuel adjustments in the twopower enrichment vs RPM and power enrichment vs. coolant tables orshould I just work in the MAF tables? So far I've been tuning in thetwo open loop and the tables. Since I made some fuel changes in theopen loop tables should I be looking at other tables for fuel changesfor open loop tuning? Lastquestion has to do with cold and warm start. My cold and warm startidle starts off at 500 - 600 rpm. I've made changes in the startupenrichment vs. coolant table. I added fuel in small increments, butthat only made it worst where the engine would not start. Should I belooking at other tables to bring the idle up? I have my idle vs.coolant table set at 1100 rpm @ -40* to 750 rpm @ 176-219*.and theIAC count is 160 at start up. Could someone help me out and point mein the right direction?Thanksin advance!
    Last edited by Rssshen Vette; 04-26-2018 at 11:32 AM.

  2. #2
    Super Moderator dave w's Avatar
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    I've always been challenged with tuning a TPI MAF system. I've had marginal success adjusting the MAF table to correct VE.

    I'd much rather tune a TPI MAP system (ECM 1227730) with VE Analyzer.

    With a 1227730 ECM there is the option of using $8D Super AUJP with WBO2 tuning.


    dave w

  3. #3
    Fuel Injected!
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    Better off swapping to the Aussie 1227165 code called $12p off pcmhacking.net that's map based and tuning from there there's a couple of tpi converted bins set up on stock 350s over on pcmhacking.net that would get you started pretty quickly. The codes custom modified and the xdf and adx files have everything in them

  4. #4
    Fuel Injected!
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    Quote Originally Posted by delcowizzid View Post
    Better off swapping to the Aussie 1227165 code called $12p off pcmhacking.net that's map based and tuning from there there's a couple of tpi converted bins set up on stock 350s over on pcmhacking.net that would get you started pretty quickly. The codes custom modified and the xdf and adx files have everything in them
    Thanx for posting this...this would be worth a peek since all I've done is speed density stuff.

  5. #5
    Super Moderator dave w's Avatar
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    I've used both $8D (1227730 MAP) and the $12P (1227165 Aussie $12P MAP). I have a LOVE / HATE of both systems. For an engine I'm going to the track with, I favor $12P,! For an engine making up to about 1.0 HP per cubic inch and requires being a daily driver I favor $8D.

    Individual Tuning Results will vary!

    $12P will get to the checkered flag first.

    $8D is a nice ride around town with some awesome Saturday Night street fun.

    $8D is less money.

    dave w

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