My boost is going

[Benrst]

For some reason when my boost pressure hits 4psi the waste gate or the DV opens and all the air rushes out and I get no boost at all. What could cause this ????

http://www.turbosport.co.uk/images/smilies/wall.gif

[C2RST]

maybe the diaphram in your wastegate has spilt. which dv have u got?? maybe the spring is broken and its openingly early. block off the the dv with a bit of broom handle and block the vacuum pipe if the prob goes away the dv is at fault if not look at the actuator. have u checked to make sure no vacuum pipes are connected properly???

HTH

[Threedoorboy]

I has the same problem with my RST it was the wastegate actuator spring had broken. Its a common problem as the actuator is under the turbo and the rad is in front so it always hot and that ends up breaking the spring. I would still try taking the D/V off first though. HTH http://www.turbosport.co.uk/images/smilies/banana.gif

[Benrst]

Ive just had a new turbo put on with a -31 actuator. The turbo was built by Turbo Technics last week and has only been on the car 2 days so I dont think it will be the waste gate spring!!!

[Threedoorboy]

You didnt say that before. Wasnt you playing with the amal valve the other day?

[Benrst]

Right here we go.

The engine has just been rebuilt and Im having a few problems. The main one is the boost problem. For some reason the actuator is letting all the boost out at 4psi and I got no boost. The amal valve is ok Im just wondering if its some sort of ECU thing that stops me running too much boost, a sort of safety cut off.

[C2RST]

did you set preload on the actuator shaft before fitting or after. doing this will increase boost before the actuator opens and releases boost

[Benrst]

I didn't do a thing to the Actuator cuz it has been set up by Turbo Technics before hand. I just bolted it on.