As for mucking about with the TPS, that is only used to estimate the load on the engine and adjust the advance curve. For example, if the engine is holding at 4500 and the throttle is wide open, it is a safe bet that it is under a tremenduous load and the ignition should be retarded a bit. Think of this as the vacuum advance on older car engines.
The reason I was mucking with the tps, was that it wasnt operating correctly. Mine would completely shut the engine off at unpredictable times. Unplugging the tps solved this problem.
On the other note. I remember reading, I think it may have been the thunder pipe guys. They had a custom power comander for the 270 degree engine, and they do experienced the same problems with trying to go past 8100. I believe they said the power comander would get confused with the signal coming to fast with this pick up system. All that being said since our engines don't make additional hp past this point theres not a lot of advantage in going past it anyway. Just seems like 8000 would be a nice round number to set the limit. Giving you the possibility to gain a few more mph in say third and fourth. Course if you're just lazing around town all this is moot anyway. A nice speed triple would probably make more since in the quest for speed.
