Should shift at redline if your WOT, regardless of your speed. Or somewhere close to redline (Think redline on the XFire is 7000RPM? So probably around 6500RPM, your HP band maxes out at 5700 RPM neways so it wouldn't matter). If you're talking WOT all the way, well hmm... that's gonna be way out of speed limit neways (in 4th and 5th gear).