Been having a bit of a annoying problem, car is running all stage 3, but normal t28, mongoose 2.5, new ngk coppers at 0.8 gap, injectors newly cleaned/flow tested and running a tank of vpower.
All happy off boost, starts fine when cold, comes on boost smooth and idles fine, but once it's on boost and really getting going it very quickly pops and bangs, and hesitates while it does it.
Googling about people are saying it's most likely rings, but car doesn't smoke, and breathers are fine. Searching here most say boost leak, which makes me wonder as the car as the boost comes on gets a slight second whistle but thought that was just air on the throttle body as not driven it in a while.
Avcr says -450 when idling, it does go up once warm to -490-500, which says exhaust valves but from what I read that just causes cold start problems, but mine fires up first turn when cold, normally takes a little longer when warm.
Gave it a bash on the way home, avcr max settings were 1.20 hit, 5500revs max so it's happening around 4500 onwards, you can slightly drive through it but not taken it to the limiter incase of damage.
If this was your car, what would your next move be?