Nah, it's still the same as it was before, though I'll change my original statement after I tested it a 2 nights ago.
The better your car is on the brakes, the faster you can go into the pits, as the autodrive can slow you down to pit speed quicker. e.g you can enter the pits faster in a FGT than a NASCAR stock car, as the FGT is lighter and brakes much quicker. So basically the speed limit will be different for every car, as well as every track. A universal speed limit would be much easier.