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Thread: ***Old School Convert Needs Help With Tune***

  1. #1
    Tuner in Training
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    Nov 2014
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    ***Old School Convert Needs Help With Tune***

    I have my car up and running now, and just figured out how to record the scanner. I did a few WOT pulls at 3k and some general driving. Hoping a few of you pro's will look at my tune. Thanks~!My first power log.hpl3_18_16 Vette Tune.hpt

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    More information please.

    What's done to the vehicle, mods etc etc.


    What are you curious about?


    And you aren't logging enough data, you should be logging knock retard, injector duty cycle, bank 1 and bank 2 injectors pulse width and your fuel trims are not working. Also your o2 sensors are not working either, they pretty much both steady at 100-300mv and at times jumping up to 700+ but they are not switching back and forth like normal.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuner in Training
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    Nov 2014
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    74 Corvette. LQ4, 10.2 forged, Aftermarket LS3 heads, cnc port on heads and LS3 intake. 68.3cc heads. Comp Cams 605/598 lift with a lobe separation of 114 deg and a duration of 231/239 @.050
    Stock 42# LS Corvette injectors
    4L60e, 3600 Vigilante, 3:73's.
    Walbro 450 in tank
    Corvette filter/regulator. I've tried two. Neither runs close to 58 psi. The first one regulated 68 psi. Replaced it yesterday with another Wix. Damn near 78 psi at the rail. Today, I fired the car and the pump sounded funny, like a whistle sound, then quit. I popped the hood and there is WELL over 100 psi at the rail. I presume I blew out the Corvette filter/regulator. I think I'll run a quality inline high flow filter and a good return type adjustable fuel regulator.

  4. #4
    Tuner in Training 67firebird455's Avatar
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    Mar 2016
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    Visalia, CA
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    Agreed, definitely get an adjustable regulator. Cool sounding build!
    67 Firebird - 4.8L, LS6 Cam, 6.0 heads, S476 T4-83mm, 9" w/3.25s, 3500 stall, TH400.