1999 Pontiac Formula top speed?
03-14-2019, 01:34 PM
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1999 Pontiac Formula top speed? So I just recently bought a 1999 Pontiac firebird formula with the LS1 and it tops out at 135 I thought at least I could get 150 out of this car it has 90,000 miles on it and a ws6 hood ram air intake and nothing wrong with it at all.
Last edited by Josh Boone; 03-14-2019 at 01:53 PM.
03-14-2019, 02:38 PM
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Top speed is 162-163mph with the factory speed limiter in place (lower if the car was not originally ordered with Z-rated tires).
03-14-2019, 02:48 PM
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03-14-2019, 04:29 PM
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03-14-2019, 09:04 PM
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03-14-2019, 09:07 PM
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03-14-2019, 09:29 PM
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I've never gone faster than 135MPH because my car starts shaking and I don't trust the 20 year old suspension, but if I'm already in 4th gear and slam the throttle, it downshifts in to 3rd and goes up the power band and shifts back in to 4th. Like 4->3->4. Is it not supposed to? I'm confused, now. lol
03-14-2019, 09:33 PM
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From first to second I have to let off the gas when I shift into third it shifts just fine and I can stay in the third until 135 then when I shift to drive it shifts so I know it has more than 135 now but my car started shaking so I'm not ever doing that again until I get new tires and my suspension fixed haha
