Any suspect noises from engine bay? Noteably whistling or hissing....
As mentioned its making essentially nothing over atmospheric pressure so will be a problem linked to the turbo and boosting side.
Are all pipes still connected between the turbo and the inlet.
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1986 UR Quattro - (1982) Lombard RAC Group 4 recreation - #24 H.Demuth/J.Daniels
1981 VW mk1 golf GTi - now 5cylinder and RWD.
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