the pit limiter is on, press L to de-activate it (there is a 48 mph speed limit in the pits, the race cars all have a nice limiter to help you!)
Lol! You asked that several times yesterday on the Aston Historic Fox server I was racing yesterday (Redline I think) At least 5 people told you that, but you didnt pay attention, so you asked several times
I've seen some people who'd probably finish higher up the order if they left the limiter on, but that's a different story...