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TB Bump Stop Mod

This is a discussion on TB Bump Stop Mod within the General Help forums, part of the LSx Technical Help Section category; Does anyone have a sticky on the TB Bump Stop mods?...

  1. #1
    Member bhunter0830's Avatar
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    TB Bump Stop Mod

    Does anyone have a sticky on the TB Bump Stop mods?

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    Senior Member tatertot91's Avatar
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    File down the bumpstop and keep checking it on the car. You want to be around 4.6 volts at what i remember being the blue wire (don't quote me on that) If you go to 4.7 volts or above i believe you'll throw an SES light

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    Here are the pics of mine showing before and after measurements and good view of the "step" that I filed into the bumpstop:








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    Member bhunter0830's Avatar
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    Awesome! Thanks
    For help guys! Can you elaborate some more on the 4.6volts?

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    Senior Member tatertot91's Avatar
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    Sunset Orange Metalic
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    One of the wire leads that runs to the throttle positioning sensor sends off a voltage signal, you should be able to stick the end of a multimeter through the back of the plug when the throttle body is plugged in. manually hold the throttle body open while you read the voltage, the more you grind down the higher the voltage will be when the blade is fully open. Ignition has to be on btw

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    Member bhunter0830's Avatar
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    Thanks for the clarification! Doesn't exactly sound like something I want to screw up!

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    Moderator 98TransAmWs-6's Avatar
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    Do aftermarket TBs like my NW 102, need the bump stop mod?
    1998 Trans Am WS6 - Phantom
    421 CI LQ9, Tick Performance Custom Cam, TFS 255cc LS3 heads, Kooks 2" LT headers, Kooks 3" True Duals w/ high flow cats, FTP 104 lid, Speed Density Tune, 4" silicon tube, LS6 VCT, FAST 102 Intake, NW 102 TB, Oil Catch Can, SLP Bilstein Shocks w/ Vogtland Springs, CTS-V 4-piston Calipers w/C6 Z06 rotors, Stainless Steel Brake Lines, R1 concepts premium rotors, Hawk HP+ brake pads, VFN WSQ Hood, C5-R timing chain, SLP oil pump, E85 tune, Walbro 450 fuel pump, Deatschwerkz 95# injectors, Breathless performance headlights, Frost Tune, !HVAC.
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  8. #8
    Senior Member tatertot91's Avatar
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    Quote Originally Posted by bhunter0830 View Post
    Thanks for the clarification! Doesn't exactly sound like something I want to screw up!
    no problem, hope it goes smoothly for you. I used a flat file and took my time. Good luck
    Quote Originally Posted by 98TransAmWs-6 View Post
    Do aftermarket TBs like my NW 102, need the bump stop mod?
    Assuming its a quality tb there should be no need to grind down the bump stop.

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    Quote Originally Posted by tatertot91 View Post
    no problem, hope it goes smoothly for you. I used a flat file and took my time. Good luck
    ^^ This. I did not take a voltage reading. Instead, I used my scanner to check the % opening of the throttle.

  10. #10
    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by tatertot91 View Post
    Assuming its a quality tb there should be no need to grind down the bump stop.
    Thanks that answered my question. It's a Nick Williams TB so I would hope for $400 or so it is.

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