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Thread: Just curious

  1. #1
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    Just curious

    The car has a comp XER281H cam, ported 706 heads, and a fast 90 with 90 TB.
    Managed to get a 7.17 in the 1/8 with this tune. I know the injectors need changed, but I am
    just curious to see if I am on the right track. First time tuning so I am proud of myself but clueless if I have made any mistakes lol.
    Thanks in advance


    7.17 Time slip.jpg

    third pass 7.17.hpl

    up timing.hpt

  2. #2
    Tuner POWERZONE's Avatar
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    At a quick glance, your spark tables need work.

    Can you list out the combination.
    Last edited by POWERZONE; 11-23-2014 at 08:46 PM.
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  3. #3
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    1998 Trans Am
    2000 computer and harness
    Stock bottom end LS1
    ported 706 5.3 heads
    fast 90 intake
    Nick Willams 90mm Throttle body
    Comp XER281H cam
    Hooker long tube headers turned out just before trans x memeber
    stock 28lb injectors
    TH350 w/trans brake with 4000 stall
    Moser 9" with 3.89 gears
    Nitrous Express MAF kit (has not been used yet)

    pretty sure that's everything
    Last edited by philricd02; 11-23-2014 at 08:51 PM.

  4. #4
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    Thanks for looking. I just wanted a piece of mind knowing that I was heading in the right direction

  5. #5
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    You might wanna ease up on the spark advance, I think your KR is real in spots, especially since you are commanding 12.7-13.2 PE.

    I would zero out the tq management: engine>tq management> spark retard

    What is your actual AFR? If you are actually getting what you are commanding 12.7-13.2, then it looks like you are gonna need larger injectors. You are above 100+ duty cycle.
    Last edited by POWERZONE; 11-25-2014 at 06:21 AM.
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  6. #6
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    I don't have a wide band so can't say on the AFR. I know for a fact it needs larger injectors, that has put me at a stand still until I get them. One thing I am not understanding is why the log says it was running 32 degrees going down the track yet the tune is only 28 degrees. Also I am running Sunoco 104 unleaded in the car.
    Last edited by philricd02; 11-25-2014 at 09:14 PM.

  7. #7
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    Quote Originally Posted by philricd02 View Post
    I don't have a wide band so can't say on the AFR. I know for a fact it needs larger injectors, that has put me at a stand still until I get them. One thing I am not understanding is why the log says it was running 32 degrees going down the track yet the tune is only 28 degrees. Also I am running Sunoco 104 unleaded in the car.
    Well, your spark advance tables are showing that you are commanding 33*.

    Ahhh, I see with the 104 oct.

    I would suggest you get a wideband before tuning or doing more WOT pulls are passes.
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  8. #8
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    Ok I see what I did lol. I was looking at the same tune but with timing pulled to 28. I have been going over and over the tune while sitting at work. What sucks is the car is put for winter and is a track only car with just enough exhaust for the 02 sensors. So with that I can't test any changes until spring and the track is the only place the car goes. I will look at getting a wideband and figure out were to put it.

    Thanks for the help, there is so much to take in with this.