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Thread: LS1 Injector/Fueling Question on WOT

  1. #21
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    Quote Originally Posted by bk2life View Post
    what is done to the engine?
    CAI?
    headers?
    no cats?
    large exhaust system?
    cam?
    cam specs?
    Without this info and a tune and a datalog, we all area just guessing.

    I have seen a few 'completed' tunes where the shop forgot to turn things back on since they were in a rush or lunchtime or whatever.
    It is possible this is the case for yours.
    On a street car, like under 1200 hp, there is no reason not to be using o2 sensors to help with fueling and overall drivability.

    I'd like to see the tune, and I bet from a few comments in here, we can make it run much better for you.
    Thanks for the help. I just added my tune to the original post, along with the last data log I did with the car.

    Some details on the car:

    SBE LS1
    PRC Stage 1 LS6 Heads - Milled .010
    Tick SNS Stage 3 Cam - 235/243 duration, .630/.610 int/ex
    Fast 102 intake with Fast 102 Throttle body and Fast Fuel Rails
    Delphi 37lb injectors - D3165BA
    Texas Speed 100MM MAF
    Speed Engineering 1-7/8" LT Headers with Speed Engineering 3" True Dual Exhaust

    Stage 2 4L60E from Performabuilt
    Yank SS4000 Torque Converter

    The car pulls nice and strong when it runs good, at least it use to. It made about 440-450 RWHP on a Dynojet a few years ago with this same tune.

  2. #22
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    Man i have to tell you, i have seen a few tables before, but i have never actually had my jaw drop until i saw yours.
    First is VE table
    Second is timing.
    How did they come up with this "tune" for you?


    nice.jpg
    nice2.jpg

  3. #23
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    Quote Originally Posted by bk2life View Post
    Man i have to tell you, i have seen a few tables before, but i have never actually had my jaw drop until i saw yours.
    First is VE table
    Second is timing.
    How did they come up with this "tune" for you?


    nice.jpg
    nice2.jpg
    Wow really? That bad? I took it to a supposedly reputable local tuner near me who had it on his dynojet tuning it. But the entire time tuning it he seemed rushed and I have always known the tune didn't feel great, especially on cold starts where its below like 60 degrees outside.

    I'm pretty new to tuning, I've never seen those 3D graphs like that before, that is really interesting to see.

  4. #24
    Senior Tuner edcmat-l1's Avatar
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    Late to the party but I'm diggin that VE table LOL

    That's one way to fix that stubborn tip in stumble LMAO!

    This falls in the category "how to tell if your tooner is clueless" LOL

    Idle spark tables are pretty bizarre also.
    Last edited by edcmat-l1; 5 Days Ago at 02:51 PM.

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  5. #25
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    I looked up that injector part number and don't see much other than it is also a Lucas injector. Is the VE table screwed up in an attempt to make up for a lack of good injector data?

  6. #26
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    Quote Originally Posted by gtstorey View Post
    I looked up that injector part number and don't see much other than it is also a Lucas injector. Is the VE table screwed up in an attempt to make up for a lack of good injector data?
    Ugh! I didn't realize how bad my tune actually is guys!

    I do remember the tuner saying he knew I had stock LS1 28lb injectors originally and the new injectors are 37lb so he just "scaled them up" however he did that.

    The tuner also said that he couldn't fix the stumble off idle, I remember he spent some time trying but never really got it.

  7. #27
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    injectors are the #1 thing to make your engine run.
    Without knowing what they are, and or the information for them, that is not a good combo.

    I don't know what size injectors fit that intake manifold/fuel rails, but, id order a set of the 50# GM injectors from one certain vendor on ebay.
    i will have to look for the link, but, i have personally purchased 8 sets of these injectors and have had zero issues with them.
    Others on this forum use them as well.

    I'll post the link as soon as i locate it

  8. #28
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    Here is the link
    https://www.ebay.com/itm/274424906026

    For the $70 dollars for all 8 you cant go wrong.
    You might have to change the plug on them.

    Just google and do a bit of research, but, id get them and then we can start fixing your tune

  9. #29
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    Quote Originally Posted by bk2life View Post
    Here is the link
    https://www.ebay.com/itm/274424906026

    For the $70 dollars for all 8 you cant go wrong.
    You might have to change the plug on them.

    Just google and do a bit of research, but, id get them and then we can start fixing your tune
    Okay thanks man, I?ll have to get some of those soon. For the price how could you go wrong. I do have a D1SC procharger kit I want to put on eventually so I might as well upsize my injectors now for that too.

    Did you happen to look at my data log on the first post? I?m still baffled as to why fuel is dropping according to the log on the top end. I do want to get my tune cleaned up for sure, but right now I?m mostly concerned about why it?s popping and missing intermittently on the top end recently. I?m tempted to just replace the fuel pump?

  10. #30
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    Check the fuel pressure.

  11. #31
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    Yikes, I'd start completely over
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  12. #32
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    Quote Originally Posted by Brootus View Post
    Did you happen to look at my data log on the first post?
    after seeing the tune, there is no reason to look at the datalog.

    especially when you are going to installing new injectors and pretty much starting over.

  13. #33
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    And by starting over, they mean go back to a stock file, other than injector data. And still check your fuel pressure.

  14. #34
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    Quote Originally Posted by gtstorey View Post
    And by starting over, they mean go back to a stock file, other than injector data. And still check your fuel pressure.
    Okay, I also have a 2001 Camaro SS that is stock with exhaust. I could use that tune file as my base, Assuming it hasn't been tampered with either.

    I'll check fuel pressure though like you said, because I have to get the misfire/popping issue fixed before I can get a new tune installed on it.

  15. #35
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    There is probably a stock '98 file in the tune repository.

  16. #36
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    Stock 2001 Camaro/manual trans

    Kyle.hpt