[QUOTE=gchristophi;6619630]
Originally Posted by
Guinnless
Have you replaced the dump valve recently?
Forgot to answer on this, I haven't changed the dump valve recently, this issue is ever since I had another head put on. The dump valve and all other bits were stripped and returned during that process. Can the dump valve have a bearing on it also ?
If the dump valve was leaking before it was stripped the boost may have been turned up to compensate. If the valve has since been fixed then you will have too much boost.
If you are making 1.5 bar on a -34 then either the wastegate is faulty and isn't opening properly or there is too much preload on the actuator. You should only have around 3mm of preload on the actuator. Adjust the actuator until it just slips onto the wastegate arm pin and then add two full turns and then refit to the wastegate arm pin. It should take a little bit of effort to stretch it on but not too much.
If still overboosts then the wastegate is likely to be at fault.