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Thread: Speed density run.

  1. #1
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    Default Speed density run.

    Howdy Guys, got the 2.5' pulley and place it on the whipple ...did a run with the speed density tune and I notive knock and seems on the tables that the tahoe is Starving from Fuel, Header Glow orange at nite ..*Yikes*
    I see 75% duty cycle on the 39lb injectors, and I notice that the A/F varies..
    2 bar map Gives me a 172kpA max I think.
    Any opinions? suggestions? Upgrade Injectors, timing??

    Dont want to keep my mouth close and blow the engine, I Rather Ask

    Gilbert
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  2. #2
    Lifetime Member 5.7ute's Avatar
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    Quote Originally Posted by nissmo View Post
    Howdy Guys, got the 2.5' pulley and place it on the whipple ...did a run with the speed density tune and I notive knock and seems on the tables that the tahoe is Starving from Fuel, Header Glow orange at nite ..*Yikes*
    I see 75% duty cycle on the 39lb injectors, and I notice that the A/F varies..
    2 bar map Gives me a 172kpA max I think.
    Any opinions? suggestions? Upgrade Injectors, timing??

    Dont want to keep my mouth close and blow the engine, I Rather Ask

    Gilbert
    First thing I would do is invest in a wideband o2 sensor & follow the autoVE procedure. This will help get your fuelling in line. Your boost VE table for starters is definately incorrect as it should increase with map, not be a flat table like yours.(unless you are using a step up regulator for fuel pressure.)
    It might be a good idea to fully list your mods.
    Cheers Mick
    The Tremor at AIR

  3. #3
    Joe (Moderator) joecar's Avatar
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    Gilbert,

    Does just 1 or 2 primary pipes glow, or do all of them glow...?

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    Quote Originally Posted by joecar View Post
    Gilbert,

    Does just 1 or 2 primary pipes glow, or do all of them glow...?
    Hey joe!

    well Very First time that I notice that I was Running on the sand dunes and the compleate exhaust was orange, including cats and Flow master, last nite since I did a Couple of runs Only the Left side sitting on the Vehicle and part of the Y pipe.

    Gilbert

  5. #5
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    Quote Originally Posted by 5.7ute View Post
    First thing I would do is invest in a wideband o2 sensor & follow the autoVE procedure. This will help get your fuelling in line. Your boost VE table for starters is definately incorrect as it should increase with map, not be a flat table like yours.(unless you are using a step up regulator for fuel pressure.)
    It might be a good idea to fully list your mods.
    Cheers Mick
    I do Have a WB mods are 2 bar map, 39lb injectors, 411 ecm,walbro 255.

  6. #6
    Lifetime Member 5.7ute's Avatar
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    Quote Originally Posted by nissmo View Post
    I do Have a WB mods are 2 bar map, 39lb injectors, 411 ecm,walbro 255.
    No worries. Wideband data is not in your log so your actual AFR is just guesswork from the o2 sensor data.
    The Tremor at AIR

  7. #7
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    Default wideband, speed density log

    Hope I did it Right this time.
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  8. #8
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by nissmo View Post
    Hope I did it Right this time.
    Gilbert,

    Both wideband AFR pids look flat...

    Also, look at IAT... it is going off the scale... something might be wrong with it.
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  9. #9
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    Did yall see the codes it was throwing?

    Diagnostic Trouble Codes
    P0112 "Intake Air Temperature (IAT) Sensor Circuit Low" ($10) "Powertrain Control Module (PCM)"
    P0341 "Camshaft Position (CMP) Sensor Performance Bank 1 Sensor A" ($10) "Powertrain Control Module (PCM)"
    P0102 "Mass Air Flow (MAF) Sensor Circuit Low" PHC ($10) "Powertrain Control Module (PCM)"
    P0112 "Intake Air Temperature (IAT) Sensor Circuit Low" PC ($10) "Powertrain Control Module (PCM)"
    P0341 "Camshaft Position (CMP) Sensor Performance Bank 1 Sensor A" PC ($10) "Powertrain Control Module (PCM)"
    P1112 "Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage" PH ($10) "Powertrain Control Module (PCM)"
    P1665 "Engine Oil Pressure Output Circuit" PHC ($10) "Powertrain Control Module (PCM)"

    History data

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