Basically my boost fluctuates badly between 3-4k RPM.

if over 4k RPM i plant the foot and it boosts perfectly 1.5 Bar and tapers off.

If under 4k RPM i can boost to .5 Bar then anything over and it fluctuates badly and dosnt seem to pull can fell a small judder and a "rattle Snake" Noise.

Cant see or find any loose Pipes etc.

I have a Race Dynamix Map, 3 Port Boost Solenoid etc.

Any Ideas?

Its driving me MAD!!

 

The car is meant to make full boost @ 2800RPM, according to spec and map by Duncan Graham.

would this be causing a issue? I.E some safety feature where the car is boosting earlier than it should?

 

Ring and ask him?