I know there are threads out there already, but I searched from my phone and it didn't show up. Has gt5 got a speed limit cap when not drafting? The fastest I can get this car is 334.7. It is still pulling then just quits. Any ideas?
Try adjusting the final gear to the left for more top speed a little so you have more power in 7th cause it sounds like you are at the end of the powerband.
I got to 535km/h without draft last night in the X2.