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Throttle bogs down when shifting

Discussion in 'Performance and Tuning' started by Clarker2000, Jul 19, 2016.

  1. Jul 19, 2016 at 12:39 AM
    #1
    Clarker2000

    Clarker2000 [OP] New Member

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    I mentioned in previous post I have a 2012 5.7 tundra on 35's, flow master duals, k&n cai and when I punch it she gets up quick but throttle Boggs down severely when it shifts.

    One guy mentioned calibrating for the big tires.

    Is that all I need to fix that issue?

    If so should I get the hypertech calibrator or the Bully dog.

    Appreciate the help.
     
  2. Jul 19, 2016 at 4:12 AM
    #2
    jburson250

    jburson250 Pensioner

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    I didn't hunt for your previous post, but if the 35's and associated suspension mods are relatively new, you may need a "zero point calibration". This is done by a Toyota shop using TechStream. There's also a DIY for doing it using a paper clip. Search ZPC for more info. It's not likely Hypertech or BD can perform a ZPC.

    Best Regards,
     
    Bob likes this.
  3. Jul 19, 2016 at 8:57 AM
    #3
    dirtydeeds

    dirtydeeds New Member Vendor

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    the ecu will unlock the torque converter and 'let off the throttle' during a shift. Unfortunately there is nothing that you can do about this.
     
  4. Jul 19, 2016 at 11:28 AM
    #4
    Clarker2000

    Clarker2000 [OP] New Member

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    So everyone that has a lifted tundra with an intake has the same issue? That just doesn't seem right.
     
  5. Jul 19, 2016 at 11:37 AM
    #5
    jberry813

    jberry813 The Mad Scientist

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    Have you tried just turning off traction control? Mine can get sluggish on redline shifts with TC still on.

    PS: The intake is a waste anyway. You lose low end torque and the factory intake is already a cold air intake. Flowmasters are also chambered mufflers which reduce torque across the entire RPM range when compared to a strait through design. In short...they suck for performance, but sound great. Their baffles are their "sound engineering" or whatever. We don't call them slowmasters for nothing.
     
    Last edited: Jul 19, 2016
    bandit likes this.
  6. Jul 19, 2016 at 11:37 AM
    #6
    dirtydeeds

    dirtydeeds New Member Vendor

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    It's not the lift that's the issue. It's the value of:

    Mass air meter volume
    Wheel speed
    Throttle position

    When the computer sees elevated mass air volume, high throttle position, and low wheel speed, it thinks it's under a heavy load and it unlocks the torque converter, downshifts a lot, and runs super rich.

    All tundras do this. Just that a lot of tundra owners don't realize it.

    The mass air meter is pretty much directly hooked up to the transmission. Ha

    You gotta remember. Our combination wouldn't have worked 20 years ago. Ecu's weren't fast enough.

    We have:
    10.2/1 compression ratio
    87 octane
    6 speed transmission
    And rated to toe almost 10k

    Get in a 1990 triton with the above combination and go luggin it down the highway, it'll pop a head gasket in less than a mile;)
     
  7. Jul 19, 2016 at 11:39 AM
    #7
    dirtydeeds

    dirtydeeds New Member Vendor

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    Good point about the Cai. Showing the ecu an artificially low reading there confuses things.
     
  8. Jul 19, 2016 at 12:38 PM
    #8
    Clarker2000

    Clarker2000 [OP] New Member

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    I will calibrate for tires and try traction control. Thanks for the info. Much appreciate.
     
  9. Jul 19, 2016 at 1:06 PM
    #9
    dirtydeeds

    dirtydeeds New Member Vendor

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    Calibration for tires only changes the speedometer.

    The ecu directly reads each wheel speed sensor and calculates mph from those readings. It then sends its calculated mph to the CAN (dash ecu) and the can feeds the info to the speedometer.

    You would have to change each wheel speed sensor to get the ecu to see a higher reading.

    But, taking off traction control will change the way it drives a little.
     
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