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Old 08-27-2013, 08:03 PM   #1
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Question 99 z28 wont go past 120mph ?

I bought a 99 z28 auto hardtop it wont go over 120 ? my 99SS my would peg out the spedo what gives ?
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Old 08-28-2013, 01:34 PM   #2
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Re: 99 z28 wont go past 120mph ?

What tires came stock on your 99 Z28? If they are not "Z-rated" for high speeds, the PCM has a speed limiter set to about 118MPH. Your 99SS came stock with Z-rated tires, so the speed limit filed was maxed out at 255.
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Old 08-28-2013, 06:59 PM   #3
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Re: 99 z28 wont go past 120mph ?

Im sure not z rated tires ! so I guess that's the issue. I also found out the alt is going out. I ready the top speed was 157 for a 99 SS ? Ive had it past 155 but didn't have a gps.

Well guess I need a tune an delete the max speed cut off .... 300 reasonable for a tune ?
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Old 08-29-2013, 11:05 AM   #4
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Re: 99 z28 wont go past 120mph ?

http://www.madtuner.com/index.php?op...id=3&Itemid=26

Camaro & Firebird
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Old 08-31-2013, 01:05 PM   #5
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Re: 99 z28 wont go past 120mph ?

thanks couldn't reply earlier just had shoulder surgery...
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Old 09-04-2013, 02:14 PM   #6
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Re: 99 z28 wont go past 120mph ?

I shouldn't be $300 just for that, that to much.
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Old 09-07-2013, 09:39 PM   #7
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Re: 99 z28 wont go past 120mph ?

ima get a tune an put my tta wheels on it with hoosier DR's
it cant run over 120 1/4 mile stock

Last edited by Mr99SS; 09-07-2013 at 09:44 PM.
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Old 09-09-2013, 11:07 AM   #8
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Re: 99 z28 wont go past 120mph ?

Quote:
Originally Posted by Mr99SS View Post
ima get a tune an put my tta wheels on it with hoosier DR's
it cant run over 120 1/4 mile stock
??????????????

I don't think anyone was suggesting that a stock 99 Z28 would turn 120MPH in the 1/4-mile.
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Old 09-10-2013, 09:35 PM   #9
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Re: 99 z28 wont go past 120mph ?

im saying im getting the 120mph off 200 shot with hosier 15's
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