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car coughs at 110mph

This is a discussion on car coughs at 110mph within the General Help forums, part of the LSx Technical Help Section category; hey guys had my car out today on the interstate, some VW jetta was TRYING to keep up w/me.......anyway i ...

  1. #1
    with a LS1 2MuchFun's Avatar
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    2005 Cadillac CTS-V

    car coughs at 110mph

    hey guys had my car out today on the interstate, some VW jetta was TRYING to keep up w/me.......anyway i noticed when i got to 110, the z coughed, dropped a few rpm, maybe 50-100 then came back up, then did it again, then i backed down to 90.......any ideas why it did that??

    i dont have it up very high often, though last weeked it did the same thing......

  2. #2
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    Not sure how accurate the speedo is that high - my guess is the car may not have come with Z rated tires and you're hitting the speed limiter? Thinking the non-Z rated cars were limited to something like 112-115? Look at the tire information on the drivers side door.

  3. #3
    with a LS1 2MuchFun's Avatar
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    2005 Cadillac CTS-V

    it came with t rated tires......its got better tires on it now.......so have to get a programmer to change the speed limiter?????

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    Yeah it's in the PCM. Limiter is easily removed with programming. If you don't want to buy one a shop can do it.

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    Senior Member ss~zoso~ss's Avatar
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    you have to remove the limiter

  6. #6
    with a LS1 2MuchFun's Avatar
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    lol thanks guys, now i know theres nothing wrong......i will look around and find someone that will do it for really cheap or free....

    we dont need some v-tak beating a LS1 on topend now do we??

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    dark blue
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    Had my up to 135 mph once. Man I was shaking alittle when I came back down. LOL


    Larry Rodriguez
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    2002 Trans Am
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  8. #8
    Formulatastic yellowv's Avatar
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    If I'm not mistaken only the LT1 cars had the limiter w/ non Z rated tires. I am pretty sure my 98' Formy didn't come with Z rated rubber and it pulls well over 112 easily.

  9. #9
    Yo Da Lin The Valley..... astyles's Avatar
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    i've hit 145 pretty easy in mine,but i dont know if 01's had the limiter

  10. #10
    Veteran 0rion's Avatar
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    Quote Originally Posted by yellowv View Post
    If I'm not mistaken only the LT1 cars had the limiter w/ non Z rated tires. I am pretty sure my 98' Formy didn't come with Z rated rubber and it pulls well over 112 easily.
    my 98 formula had z-rated tires on it.

  11. #11
    with a LS1 2MuchFun's Avatar
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    2005 Cadillac CTS-V

    it runs strong till the limiter kiks in.......dunno maybe someone reset it to a lower limit.....guess it is GOOD FOR ME to only be able to go 110 anyway LOL

  12. #12
    JOSEY FUCKING WALES! Frankthetank's Avatar
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    its ur rev limiter (Speed limiter).....
    My 98 z had the same thing....mine would do it at 115........

    TSP Rumbler, LT's, TSP Tqr2, PRC 921 Springs, Comp Lifters, Chromoly 7.4" Pushrods, Titanium Retainers/Seats/Seals, ARP head bolts, BMR full Rear suspension

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  13. #13
    Nitrous Tuner LS2Tuner's Avatar
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    Quote Originally Posted by Frankthetank View Post
    its ur rev limiter (Speed limiter).....
    My 98 z had the same thing....mine would do it at 115........

    Yes it's the stock PCM speed limiter.

    You'll need to remove it to cruise at 120 mark......
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

  14. #14
    Member 02WS6dream's Avatar
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    2002 Trans Am WS6 traded

    so...i've been 135 or so in my 2002 ws6 several times--so curious-does that mean that the speed limiter has previously been removed, or is there a difference between years, or models???? experienced speed limiter in both pontiacs before this (grand prix's) and never in this car.

  15. #15
    Junior Member redbirdws6's Avatar
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    2001 Trans Am WS6 6speed

    It depends on the tires your car came with from the factory, some of the Z's and T/A's had a lower speed rated tire so they set the limiter lower on those models.The Z28ss and WS6 came with high speed tires and handling packages so they were able to handle the higher speeds therefore your limiter was set up to cut in untill higher rpms. I ran mine out about a month ago in 4th gear to aprox. 140, the rev limiter kicked in at red line and I shifted into 5th and never did see the rev limiter again cause she was doing all she could do which is 156. But all of them came with rev limiters,not speed limiters.hope this helps.

  16. #16
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    Pewter
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    I know my stock 2000 Z28 will hit 135. Friend of mine is a cop and he and I were playing when I went to visit them. A lot of long abandoned roads up in West Virginia...lol., It does have the Z-Rated tires

  17. #17
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    i dunno how fast i was goin but the speedo stops at 155 and i was still going...took a while to slow back down

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