top speed

Bradley Erickson

Asked by Aug 31, 2009 at 03:15 PM about the 1999 Pontiac Sunfire

Question type: Maintenance & Repair

my 99 sunfire gt accelerates prety strong up to 180 then the speedo tops out and the car keeps accelerating i kinda lost my nerve at that point and took my foot off the floor. but i'm fairly certain the previous owner put high comp pistons in it.

4 Answers

Charles Hagy

damn 180 in a sunfire holy shit

Corey Eichelberger

Sounds like you are using the metric system.. I would have to guess that it is 180 KPH and you should be hitting the governor somewhere around there but you most likely have it tuned out of your PCM. What mods do you have on the car? Intake, exhaust, etc?


Stock ecm will shut off fuel at 105 mph.

Kelvin Moore

ive had my sunfire top out at 220 k an hour but the govenor has been shut off...

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