PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Top Speed?

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Old Jul 25, 2002 | 05:20 PM
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Default Top Speed?

How fast will the stock computer allow an LS1 to go before shutting off the fuel? Some guy told me it was 105mph.
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Old Jul 25, 2002 | 05:46 PM
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Default Re: Top Speed?

I think the cars that come with non Z-rated tires are about 105mph (not sure exactly), but my car was limited to 160mph as I discovered by reading the stock pcm file with LS1 Edit. My car originally came with Goodyear GSAs which are Z-rated.
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Old Jul 27, 2002 | 01:43 PM
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Default Re: Top Speed?

I was told by gm that the cut off was 137-138 mph. You can buy the programer to go around that. I just set mine to zr rated tires which is 255 mph. Wont be going there!!! It depends on the year of your car they where all set diffrent.
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Old Jul 27, 2002 | 04:20 PM
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Default Re: Top Speed?

Have had mine to 152....... A4 w 273's <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
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Old Jul 27, 2002 | 11:48 PM
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Default Re: Top Speed?

A Z28 Camaro with Z rated tires will go about 160MPH than the computer will cut off the fuel.

I say "about" because it is not that accurate, you could hit fuel cutoff between 157 to 163.

Also, 99% of F-Bodys will go over 160 MPH Without a speed limiter.
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Old Jul 30, 2002 | 01:16 PM
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Default Re: Top Speed?

Well, i have a '98 without Z-rated rubber. I guess i could just find out if its limited on my own <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> . I don't have a programmer though so i can't change the max speed right now anyways
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Old Jul 30, 2002 | 06:45 PM
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Default Re: Top Speed?

I've been beyond the 155mph limitation of my speedometer without reprogramming anything. Mine is a '99 Z M6 with 3.42.
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