Results 1 to 9 of 9

Thread: 4.8l ls1 comp cam Thumpr 275thr9

  1. 01-18-2015 #1
    jadkins1141
    jadkins1141 is offline
    Tuner in Training
    Join Date
    Jan 2015
    Location
    Delaware
    Posts
    16

    4.8l ls1 comp cam Thumpr 275thr9

    I have a 2003 Chevrolet Silverado with a 4.8l and I just put thumpr cam in it. I aslo have cold air intake, exhaust, stock converter, 3.42 gears. I finally got my idle tuned almost perfect, but my WOT part of it is not right. from a holeshot it boggs way down and rpms climb up slow until it hits mid rpm range. it wont do a burnout. it will start backfiring out throttle body.

    heres where im at so far
    Attached Files Attached Files
    Reply With Quote Reply With Quote
  2. 01-19-2015 #2
    Mudweizer
    Mudweizer is offline
    Tuner in Training
    Join Date
    Jul 2011
    Location
    Houston
    Posts
    45
    Tune the VE and MAF tables to start with.
    Reply With Quote Reply With Quote
  3. 01-20-2015 #3
    jadkins1141
    jadkins1141 is offline
    Tuner in Training
    Join Date
    Jan 2015
    Location
    Delaware
    Posts
    16
    Quote Originally Posted by Mudweizer View Post
    Tune the VE and MAF tables to start with.
    Which way do I move them up or down
    Reply With Quote Reply With Quote
  4. 01-20-2015 #4
    Mudweizer
    Mudweizer is offline
    Tuner in Training
    Join Date
    Jul 2011
    Location
    Houston
    Posts
    45
    Quote Originally Posted by jadkins1141 View Post
    Which way do I move them up or down
    Do you have a wideband air fuel sensor/gauge? I looked at your scan but never saw the reading.
    Reply With Quote Reply With Quote
  5. 01-20-2015 #5
    jadkins1141
    jadkins1141 is offline
    Tuner in Training
    Join Date
    Jan 2015
    Location
    Delaware
    Posts
    16
    Quote Originally Posted by Mudweizer View Post
    Do you have a wideband air fuel sensor/gauge? I looked at your scan but never saw the reading.
    no not yet. I didn't know if I can make my tune alittle better until I get wideband
    Reply With Quote Reply With Quote
  6. 01-20-2015 #6
    jadkins1141
    jadkins1141 is offline
    Tuner in Training
    Join Date
    Jan 2015
    Location
    Delaware
    Posts
    16
    my gas mileage has went to shit also lol
    Reply With Quote Reply With Quote
  7. 01-21-2015 #7
    mariesito19
    mariesito19 is offline
    Tuner in Training
    Join Date
    May 2011
    Posts
    42
    you need injector more big
    Reply With Quote Reply With Quote
  8. 01-21-2015 #8
    jadkins1141
    jadkins1141 is offline
    Tuner in Training
    Join Date
    Jan 2015
    Location
    Delaware
    Posts
    16
    Really?? it runs better map sensor unplugged
    Reply With Quote Reply With Quote
  9. 01-21-2015 #9
    Mudweizer
    Mudweizer is offline
    Tuner in Training
    Join Date
    Jul 2011
    Location
    Houston
    Posts
    45
    Quote Originally Posted by jadkins1141 View Post
    Really?? it runs better map sensor unplugged
    Buy a wide band and tune it.
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »