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Thread: Please help new to HPT and have idle problems

  1. #1
    Tuner in Training TeamLS's Avatar
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    Please help new to HPT and have idle problems

    Hi guys and girls.
    Ive just put a cam and Edlebrock intake on a LS1 VX SS.
    The cam is a 231/239 @50 with .550" lift at 112LSA.
    Intake is a Edlebrock with a 90mm throttle body on it.
    Siemens 60lbs injectors.
    My problem is i dont know how to change my tune to suit these injectors.
    the car runs but wont idle and is running very rich.
    Just wondering if someone could have a look at my tune and see where im going wrong.
    Thanks
    Attachment 38250
    HJ ute-LS1-Cam-Nitrous-9"
    GQ Patrol-LS1-8" Lift-Fun
    VK Calais-LS1-Cam- in the build for the missus to skid


  2. #2
    Advanced Tuner sarg's Avatar
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    Hey Team, I would start with making sure that you have all the correct injectors settings plugged in. If you have not changed them, I would look here as well as on LS1tech in the tuning section to try to find the correct settings. Beyond that, the thread about injector timing may or may not be of use to you. It is a long read, but worth it in my personal opinion for the knowledge that can be gained by reading it. It took me a couple days to get through it all and digest it, but it is another good start.

  3. #3
    Advanced Tuner JamesLinder's Avatar
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    It is impossible for a motor with 60 lb/hr injectors to run correctly when the injector flowrate (IFR) table contains values for 28 lb/hr injectors. This is simply insane. No doubt the MAF and VE tables will need to be recalibrated, but until you change the injector tables to the correct values you might as well park the car and forget about trying to drive it. It is going to inject more than twice as much fuel as the motor needs at a minimum at all times. It would have run much better if you had left it stock.

  4. #4
    Advanced Tuner
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    Mar 2010
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    definetly going to have to get your injector data right.
    1993 reef blue Mustang coupe
    Ls1 conversion
    1 7/8 cooks headers
    AFR 205 heads
    Fast 92/92 intake
    PAT G./ EPS Custom cam 230/234 .600”/.602” 112LSA +2 advance
    century Built 4l60e with Circle D 3500 converter
    4.11 gears

  5. #5
    Senior Tuner
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    Poor guy, basically first thing he said is he needs help with Inj's and everyone just telling him he needs to fix injectors LOL

    Anyways, here are the number I found from James@shortuning came up with.

    Hope this helps.

  6. #6
    Tuner in Training TeamLS's Avatar
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    Thank you planethax.

    I sorted it now thank you.
    But for everyones infomation the car did still run and fire it just wouldnt hold idle with the IFR vs KPA table still set for 28lbs. That table is now up around 9 and 10s
    HJ ute-LS1-Cam-Nitrous-9"
    GQ Patrol-LS1-8" Lift-Fun
    VK Calais-LS1-Cam- in the build for the missus to skid


  7. #7
    Advanced Tuner sarg's Avatar
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    Is that for 43.5 psi or 58 psi fuel pressure. I would think 60 lb injectors would be 60 lbs not 70 in the flow rate chart?