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  1. #1

    engine under vaccum AFR problem , need to help !!!!!!!!!!

    hi guy ! today i take one day time setting my ski , below is my turning result :

    i loose out turbomarts fpr 800 big scrw , i using the key on the post with engine not running adjust my fuel pressure to 54psi using the big screw on the BEGi as a place to start, i go down the water start the engine remove turbosmarts fpr800 vaccum line and start adjust turbomarts fpr 800 big screw find the idle AFR 13 , but when i turned the fpr 800 big screw to fuel presure 70psi AFR result is 15, and i turned out fpr800 big screw to fuel presure 48psi AFR result is 18.5 , so i can no find AFR under idle 13 , set my fpr800 to fuel presure 60psi lock big screw , and start to run my engine , below is after i runing my engine AFR and boost result :


    RPM AFR BOOST PSI
    1820 14-15.2 -10
    2500 12 -9
    3000 12.5 -7
    3500 14 -5
    4000 14.2 -4
    4500 13.9 -2
    5000 13.3 0
    5500 12.6 3
    6000 11.5 6
    6500 11.3 8
    7000 11.4 9
    7500 11.4 11
    8000 11.4 13
    8300 11.7 15

    this adjust begi little screw on the nipple turned out 45 minit , for this result , hope any pepole can help me find the engine under vaccum AFR problem !!!!!!!!!!!!!!!!!! thk


  2. #2
    speedskixp's Avatar
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    Quote Originally Posted by thomas loh View Post
    hi guy ! today i take one day time setting my ski , below is my turning result :

    i loose out turbomarts fpr 800 big scrw , i using the key on the post with engine not running adjust my fuel pressure to 54psi using the big screw on the BEGi as a place to start, i go down the water start the engine remove turbosmarts fpr800 vaccum line and start adjust turbomarts fpr 800 big screw find the idle AFR 13 , but when i turned the fpr 800 big screw to fuel presure 70psi AFR result is 15, and i turned out fpr800 big screw to fuel presure 48psi AFR result is 18.5 , so i can no find AFR under idle 13 , set my fpr800 to fuel presure 60psi lock big screw , and start to run my engine , below is after i runing my engine AFR and boost result :


    RPM AFR BOOST PSI
    1820 14-15.2 -10
    2500 12 -9
    3000 12.5 -7
    3500 14 -5
    4000 14.2 -4
    4500 13.9 -2
    5000 13.3 0
    5500 12.6 3
    6000 11.5 6
    6500 11.3 8
    7000 11.4 9
    7500 11.4 11
    8000 11.4 13
    8300 11.7 15

    this adjust begi little screw on the nipple turned out 45 minit , for this result , hope any pepole can help me find the engine under vaccum AFR problem !!!!!!!!!!!!!!!!!! thk
    Sounds like you need larger injectors for your les cook ecu. if your idle pressure is 70lbs and A/f in the 15's

  3. #3
    h2jim's Avatar
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    What injectors are you running?

  4. #4
    I am using teka 72lb injector kit

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