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Discussion Starter · #1 ·
having problems with an let holding boost on p4. it peaks up to about 1.6 bar at around 4000rpm then constantly drops off down to about 1 bar at 6000rpm. previously it used to hold 1.6-1.7 bar to 7000rpm. the actuator is 5 years old, has the helper spring. what im thinking is it maybe isnt a very powerful actuator so has worn pretty quickly.

any tests that i can carry out to see if it is the actuator and not the turbo?
 
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