bwonda

Hi Evo group, i have an Evo x 2009 still stock on hardware except the cosworth intake i have but has also has been running on a tune for a while without any issues, recently i started getting boost cut every time i was trying to boost above 4000 to 4500 rpms, this only happens on instant foot down, otherwise i can drive it to 180 kph on slow pick..without experiencing boost cut. i initially though it was fuel, dint work after i changed to fairly high octane fuel, also i got C1035 code for RR speed sensor around the same time this issue started.

sorry for the long post, what would be the cause?

patrick