hey guys
thought i'd post this up
basically i have a 32 running an rb25 turbo with rb20 actuator (not sure which series r33 it is tho)
also has fmic and 3 maybe 3.5 inch cat back with a gutted cat (i didnt gut it so not confirmed that it does)
the actuator is running off a pressure source on the hot pipe about 20cm from the turbo outlet
it also has a digital boost guage built into the turbo timer and an alarm is set for 0.9 bar
problem i am having is that it doesn't come onto boost very hard and there is a very noticable flat spot between 4000rpm and 5500rpm
once it passes this rpm point it pulls fantastically untill i hear the beep from the boost guage and a split second later it hits what i would say is boost cut as it looses all power and makes crazy noises
my questions are, what could be causing it? how can i fix it? and what could be causing it to do this?
mechanically i'm pretty good and i've now got another car to drive so i can take things apart to insect if need me
help me guys as its really anonying!
Thanks,
Tom