Originally Posted by goregasm
It's a CVT, 100% managed by the TCM. Certain driving conditions may change the rev limit. At least that's my thought, feel free to let me know if you disagree.
That seems odd but it could be true. It would seem that it would be under the same conditions both times, right? You were WOT the first time and WOT the second time. The first time it revved up to 6.5, the second only to 6. I'm not sure what exactly it would have changed in response to driving conditions and why. Specifically, altering the rev limiter seems like a very odd thing to do when you're going WOT.
If you had just disconnected your battery and the ECU/TCU was relearning, that would make sense to me.
I guess we'd have to take a trip to Japan and ask the engineer what's up. I guess also that the fact that it's a CVT makes the programming even more of a mystery to me.