hi have an erst fitted with a collins chip and collins actuator. when driving the car it only seems to boost really strong in first and second, it boost upto 15psi and then drops to 10 after that,and then in third and fourth it just stays at 10 psi and doesnt really seem to be boosting.
any ideas?? have been told that the collins actuators are rubbish,but not sure? also does it sound like a boost leak? and if so what could be causing this???
thanks in advance

 

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anyone ?????