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Boost peaking and dropping

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Old Sep 19, 2010 | 08:23 PM
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I'm Finding My Feet Here Now
 
Joined: Jun 2004
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From: croydon,surrey
Default Boost peaking and dropping

S1 rs turbo running FRST engine with a T3.

car is peaking at 10psi then the needle drops right down and only holding 5psi. thought it was the actuator but i have a forge item and took it apart and its fine, has a blue spring fitted.

I have discovered some cracks in the rear housing of the turbo would these cause this kind of behavior?

I welded them up today but it doesnt appear to have made any difference?
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