Fix your Slow dropping/hanging RPMs

Discussion in 'SN95 4.6L Mustang Tech' started by magnum347, May 1, 2005.


  1. habiv

    habiv Member

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    I just did this procedure on my '98 GT. It's an automatic and it didn't affect the shifting at all. I used the copper plug method and went with a hole a little larger that 9/32. I notice a definite improvement but I think I will try a little smaller hole at some point. The car is so much nicer to drive it's unbelievable. The car slows down just enough when you take your foot off the gas. I am not on the brakes nearly as much. Thanks to the guy who figured this out.
    #41
  2. magnum347

    magnum347 Member

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    Wow... this thread took off in the past couple days.

    MustangEd.... I can send you another that'll make the difference even greater if you want it. I'm all for customer satisfaction bro... Check the hole with a drill bit to make sure it's 9/32"... if bigger... I'll send you a new one. Sorry about the broken bolt.

    As for automatic xsmn mustangs... I dunno, but your welcome to try it.

    Gotta go back finish installing/wiring my NX wet kit.

    $7.50 shipped even to our Canadian brothers....
    #42
  3. magnum347

    magnum347 Member

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    Made a new batch of these and can't beat it for $7.50 shipped.
    #43
  4. BLKsteeda

    BLKsteeda New Member

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    Do these work with aftermarket plenums? I have an accufab and I was looking at the attached pic and it seems there is only one hole in the IAC...correct me if I'm wrong.


    [​IMG]
    #44
  5. magnum347

    magnum347 Member

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    Yes, just like my Bullitt has only one hole for the IAC.

    Yes it will work fine. :flag:
    #45
  6. BLKsteeda

    BLKsteeda New Member

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    Cool! Thanks!!!
    #46
  7. SMRcalidiv

    SMRcalidiv Founding Member

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    i cant wait to get mine, to bad my car just broke. im curious about how you made mine for the bullitt, i keep seeing something about different sized holes, i know you had a bullitt so i assumed you knew what i was looking for, can you tell me how you set it up in terms of small/large or quickest to slowest dropping rpm's?
    #47
  8. rkutzner

    rkutzner Founding Member

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    Heck, I just gave him 10 bucks ! If it does anything like those running it said, it's worth every penny !!! Can't wait to get it :banana:
    #48
  9. Justin03GT

    Justin03GT New Member

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    if you dont wanna wait for it to be shipped and pay the $7.50...i just used a soda can...just use the gasket as a template, took me about 10 mins and works great!
    #49
  10. Pughman

    Pughman New Member

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    :doh:
    #50
  11. GT98

    GT98 New Member

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    Does the small hole go on the left or right? I'm hearing both and I'm not feeling a difference with either
    #51
  12. mity2

    mity2 I like Pro3 and all I got was this crappy CT.

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    i use smaller holes go over IAC holes.
    #52
  13. gnat

    gnat New Member

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    sent my 7.50... I have enough projects to work on without taking time to make one of these bastards.
    #53
  14. slow96mustang

    slow96mustang New Member

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    soda can is exactly what i was thinking when i first seen this.
    ima doin it to mine too. its a auto. ill let ya'll know.
    #54
  15. 98GT

    98GT Founding Member

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    any one here using this plate have a custom dyno tune done? I'm wondering if this will affect any type of air/fuel settings done to my chip (LaRocca's tuned). I'd really like to do this mod, I've hated the RPM hang up for years. Also: I used to have an auto, now a TKO with a spec aluminum flywheel and it still does the hang up, if not worse than before.

    BTW...my friend had a 97 cobra, didn't hang up at all? Problem with 98 and up? Or just a GT problem? Thanks
    #55
  16. 98GT

    98GT Founding Member

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  17. 98GT

    98GT Founding Member

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    lil help?
    #57
  18. BLKsteeda

    BLKsteeda New Member

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    I do have a custom superchips tune for my car...I installed the plate about a couple of weeks ago and the only thing I have noticed, that my car never did before, is when I start the car cold and turn the air on, it stalls until I get the car going...not sure if that is related to the plate or not but I think it is...plus I don't really notice a huge difference from the plate IMO.
    #58
  19. Give Me TP

    Give Me TP New Member

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    I have a custom Diablo Predator tune and have noticed a momentary drop in idle to around 400-500 rpm when stopping, especially when the A/C is on, since downloading the tune. I am going to take the IAC plate I have installed out this weekend and see if it makes any difference. Will report back here what happens.
    #59
  20. stangen97

    stangen97 New Member

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    Made one out of gaskit material and worked great.And i made one for my buddys auto he liked it alot.Its not as noticable for the auto but its their.
    #60

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