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Engine cut-out at 120mph

This is a discussion on Engine cut-out at 120mph within the External Engine forums, part of the LSx Technical Help Section category; so my car is being extremely weird...if i am accelerating at WOT and hit 120 all of a sudden it ...

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    Engine cut-out at 120mph

    so my car is being extremely weird...if i am accelerating at WOT and hit 120 all of a sudden it feels as though i hit a rev limiter (car is tacking 4000). If anyone has any info about this please get back to me...its really bothering me not being able to go faster than that.

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    Senior Member Zboner's Avatar
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    ls1?

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    give us more info, my guess is the speed limiter is set to this. If your car didn't come with Z rated tires, that's the problem. All Z rate tire cars were set to 162

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    give us more info, my guess is the speed limiter is set to this. If your car didn't come with Z rated tires, that's the problem. All Z rate tire cars were set to 162

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    its a 1998 z28

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    Senior Member Zboner's Avatar
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    hum? i had my 98 z up to 150.

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    Senior Member SeVeReDiStOrTiOn's Avatar
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    how do you know if the car came with factory z rated tires...is there a rpo code for it?

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    If there is a limiter then how would i go about taking it off?

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    Senior Member Zboner's Avatar
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    get it tuned out.

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    how much does that run and should i take it to gm or a mechanic?

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    Senior Member Zboner's Avatar
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    whatever they charge you take it to a LS1 shop if there is one around you, at mine i can get that done and tune everything i want for 300 bucks.

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    Modding is an Addiction bww3588's Avatar
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    check the sticker inside the drivers door. where the size is between the size and the pressure you will see a speed rating.

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    Yep, my car came w/2.73's and GSC tires, has Z rating on the door. There's also RPO codes for the tire ratings.

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    alright, so i checked and it said that it had T rated tires originally. Thats not Z and im guessing thats why it does this...Now just one more question, can someone refer me to a good ls1 guy in the orlando/tampa area. (does it matter if i go to an ls1 guy or can i just go to a mechanic?)

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    Member Frosty's Avatar
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    Why bother going through the trouble and $$ just to have the speed limiter disabled?

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    Senior Member SeVeReDiStOrTiOn's Avatar
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    05 Wrangler
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    a handheld programmer should be able to remove the speed limiter...so you can do it yourself. I could be wrong though but if any of the handhelds can do it the predator handheld can

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    I live in st. pete and there is a dyno tuner in tampa I will get more info and if all you want to do is remove the rev limeter a hand held will do it.

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    Senior Member Zboner's Avatar
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    Quote Originally Posted by INFERNO
    I live in st. pete and there is a dyno tuner in tampa I will get more info and if all you want to do is remove the rev limeter a hand held will do it.
    \


    hey i was just down there in St pete this summer nice place. buddy has a house down there.

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