I suppose it should be possible to shift up while in full throttle with a car that has ignition cut? It seems that the FO8 however doesn't want to shift up when you're higher in the rev range (yellow or close to limiter) even if I lift off completely. Don't know if restrictions have anything to do with it or not, but this happened on the CTRA singleseater2 server. Tested it on single player also.

probibly the same as this thread:
http://www.lfsforum.net/showthread.php?t=37418

CTRA SS2 has intake restrictions and I have found it difficult to change up there too. I am assuming it must be to do with the intake because I have no problem elsewhere.

Mine doesn't cut the ignition off, it simply stops reacting to shifting commands. I use a shifting paddle and if I click it several times it will shift. I really thought it was hardware related, but reading the suggested post I see that it isn't.

But mine does that on any track and server but only with the F08.