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Thread: Hello everyone, New Here looking for tuning advice

  1. #1
    Tuner in Training
    Join Date
    Mar 2020
    Location
    New Bedford, Ma
    Posts
    39

    Hello everyone, New Here looking for tuning advice

    Hey guys so I am new here. I have a 07 Chevy Avalanche with a 5.3 Flex fuel V8 4x4 LT. I just bought my first HP tuner. I had a Diablosport i2 before this and since I recently installed a Summit 8701 Stage 2 truck cam and crane springs, I needed a better tuner. I did have the engine running with the Diablosport tune but barely. I watched several videos and get the basics of HP but I am not keeping my truck running after I ported and polished my throttle body, the air tables and TPS may be off not sure how my MAP changed either. Can anyone help?
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  2. #2
    Senior Tuner mbray01's Avatar
    Join Date
    Dec 2013
    Location
    Slidell, La.
    Posts
    1,015
    THE MAP CHANGED BECAUSE THE ECM LOOKS FOR A SPECIFIC THROTTLE POSITION FOR A RELATIVE AIRFLOW AT IDLE. WHEN YOU PORTED IT(I ASSUME YOU REMOVED THE RIDGES AROUND BLADE, IT CAUSED THE THROTTLE BODY TO FLOW MORE AIR AT THE SAME THROTTLE POSITION. THE ECM USES TWO MODES TO CONTROL IDLE, AIRFLOW CONTROL(SLOWEST RESPONSE), AND TIMING CONTROL(QUICKEST RESPONSE). WHATS LIKELY HAPPENING IS THAT THE THROTTLE BODY IS IN THE SAME POSITION, MOVING MORE AIR, BUT THE ECM IS PULLING TIMING TO CONTROL IDLE, THIS WOULD GIVE YOU A MUCH DIFFERENT MAP READING, AND SUBSEQUENTLY CAUSE THE ENGINE TO RUN RICHER AS WELL DO TO THE HIGHER MAP READING. yOU ARE GOING TO HAVE TO DIAL IN THE AIRFLOW MODELS, AND RE CALIBRATE THE THTOTTLE BODY SETTINGS
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
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