Rotrex Busa Dragbike , TTS C38 low boost setup ...

[Plan9]

Not suprising, as that is really high rpm for any gen Busa engine...not to mention boost.
It's a wonder it didn't grenade.

I used 11500 rpm at shift, no problems. Got APE 47lbs springs this far, with stock valves. Now upgraded to +1mm stainless valves with kibblewhite springs (68lbs?). I used FT auto shift , it shifted gear exactly at the RPM asked (+-10 RPM).
I think it's the hard RPM limiter to hover the valve, and lift collet.