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Thread: Lean no load 4000 rpm SD tune

  1. #1
    Tuner
    Join Date
    Feb 2006
    Location
    Marion, KS
    Posts
    78

    Lean no load 4000 rpm SD tune

    I have a strange VE table that is needing over 100% values at 4000 rpm and up at only 15 to 25 KPA. It idles with somewhat normal values of around 30% at 800 rpm at 65kpa. I haven't drove the car yet to really dial in the VE table so don't roast me about how bad it looks now. The only area that I am concerned with is above 4000 rpm. I applied correction to that area a couple of times and ended up wanting almost 140% in some cells. It wouldn't rev up above 4000 rpm before I started adding ton to the VE table in the part throttle area. Scared what the full load values will need to be based on part throttle numbers.

    2000 Firebird, 2002 OS, 2005 GTO LS2 engine built by Virginia Speed, 427 ci, Mast heads, apx 241/250 duration at .050, LS7 rockers, 102mm Fast throttle body cable driven, LS9 injectors, 4" air intake with no MAF, headers, WB in place of left Narrow band, Open Loop
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    6 sec 648TT Outlaw 10.5 86 Camaro (sold), 2010 Camaro SS (sold), 64 chevy C10 w429ci LS3 M6, 2020 Challenger Hellcat Redeye

  2. #2
    Tuner
    Join Date
    May 2013
    Location
    Houston
    Posts
    105
    Try following this guide. If you post on LS1GTO try asking there and maybe steel chicken or someone knowledgeable will help you out. Unless DSteck gracious your thread and gives out some wisdom. I've heard that what you're seeing is a sign that the injector data is wrong so that pdf won't help if that's the case.


    http://michigansnowmobiler.com/hptun...ons%20rev2.pdf


    Injector data

    http://www.hptuners.com/forum/showth...-Values-Inside
    Last edited by danieloneil01; 10-24-2013 at 07:13 PM.

  3. #3
    Tuner
    Join Date
    Feb 2006
    Location
    Marion, KS
    Posts
    78
    Double checked my injector data. I was just a little off on the flow rate table but not enough to make a difference. The offset table looks like I should have had almost .75 at 80 in vac at 14 v and I had .473. Not sure how I did that. I had to interpolate all the data because none of the labels matched up between the 2011 CTSV I copied from and my 2002 OS. This should help some since it was only using 2.3 msec pulse widths at these light loads.

    Just to verify on the Inj offset table would 58 psi pressure delta on the CTSV tables equal 0 Vac on my 2002 table, and would 69.6 psi on the CTSV table equal 80 Vac on my 2002 table????
    Last edited by stan; 10-25-2013 at 10:36 AM.
    6 sec 648TT Outlaw 10.5 86 Camaro (sold), 2010 Camaro SS (sold), 64 chevy C10 w429ci LS3 M6, 2020 Challenger Hellcat Redeye