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Hade the chance to test the topspeed of my C5 the other day.
But it stopped at 240kph(148-149mph). In 4th gear at about 4500rpm or so.
Anyone has any ideas, it got there in no time, and den it just stopped to
accelerate, just like a limiter and not like there wasnt enough power.
There is a factory speed limiter setting, but mine was set at 255mph. If yours was changed, it can be modified with HPTuners. When it's enabled, no matter what your pedal does, the computer will close the electronic throttle to maintain the speed limiter. I tried it at 40mph once it was funny.