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Thread: Nitrous Issue

  1. #1
    Tuner in Training
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    Nitrous Issue

    I have a heavily modded 06 silverado I have been having an issue putting nitrous to. Basically I launch the truck-> it goes to the point where the wide open throttle signal turns the nitrous on then the truck falls on its face then will start the rev up again and will spray through the run. Which can be seen by the attached logs. In the run 2 log the throttle was let off for spinning. The truck runs great on the motor and can be seen in that log file. Attached is also my tune if anyone has any idea on what it could be.
    At first I thought the x link for the throttle body could be the reason for this happening but I talked with the manufacture and learned the 0-5V signal pull for the throttle position doesn't go through the xlink.
    Any help would be appreciated.
    Leakesville_motor_run1.hpl
    mobile_nitrous_run1.hpl
    nitrous_mobile_run2.hpl
    Truck_200shot_082214.hpt

  2. #2
    Tuner 1slowbusa's Avatar
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    At what RPM do you have the nitrous coming on? I am guessing this is on a window switch? What size is the shot?
    Last edited by 1slowbusa; 09-11-2014 at 09:23 PM.
    2000 Camaro SS
    Polluter V2 Cam
    AFR 205 Heads
    Fast 102 Intake
    & More

  3. #3
    Tuner in Training
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    3100 and its a 200 direct port (.028/.014 ) jets

  4. #4
    Tuner 1slowbusa's Avatar
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    Take a look at the at your lambda reading (in mobile_nitrous_run1) when you go to wide open throttle and you hit 3100 rpm, you are very lean. Your commanding 12.34 AFR and your wide band is reading 1.05 Lambda (15.36 AFR). I would also question the 12.34, I would think you should be quite a bit richer when starting the tuning process for that big of a shot. Maybe try to do a 50 shot, get that lined out then move your way up from there. This is what I see at a glance.
    2000 Camaro SS
    Polluter V2 Cam
    AFR 205 Heads
    Fast 102 Intake
    & More

  5. #5
    Tuner in Training
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    I will take a look. I have never seen a nitrous kit without a lean spike right when it hits just because the pressure difference in lines fuel=55psi vs. 950psi bottle the fluids physical don't move at the same rate down the lines. Yes there is head loss in the line going from bottle to the solenoid but not that much... Also I'm spraying 200 coming in 30% over 1 second on both of these passes so initial hit is ~60shot.
    Though today I'm putting on a plate and doing what you suggested and will find out more. I know fuel (amount) isn't an issue because it goes down to .69 in first as well so 10.1 afr now the initial hit may be a different story.

  6. #6
    Tuner 1slowbusa's Avatar
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    Something else you may try is to reduce the PE Thottle/Pedal Hot and Cold. Right now the table is set to 90 across the board. What if you set it to 45-55. This will activate the PE quicker to reduce the leaning after you verify your VE and MAF tables good to match the commanded AFR.

    This is what mine is set at.
    65.0 65.0 65.0 65.0 65.0 63.9 60.3 55.5 50.7 47.0 46.0 46.0 46.0 46.0 46.0 46.0 46.0 46.0 46.0

    Hope this helps.
    2000 Camaro SS
    Polluter V2 Cam
    AFR 205 Heads
    Fast 102 Intake
    & More

  7. #7
    Tuner in Training
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    So here is my latest log. This is a 50 shot. Pulling off the APP 1 pedal sensor completely different response then off the tps wire. Now the throttle is reading what I think it is when the nitrous comes on.
    streetpull50shot.hplstreetpull50shot.hpl