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M50 supercharged,boost gauge gets crazy!

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    M50 supercharged,boost gauge gets crazy!

    Hey guys,I have a suspicious problem on my car. Everytime i full press the gas pedal, regardless of gear or rpm range,boost meter shows rapidly 5 psi of boost and the needle get crazy,it's jumps around 5 to 9 psi ( supercharger can't boost more than 5 psi,so it's false number) like valve leak or something... If I slowly speed up,not floor the pedal,it's steady 5 psi unti rev limiter... Do you think that valve timing or ignition timing is bad?? Car pulls fine,no hesitation or other visible problems.. Could it be knock? Using a narrow band O2 meter,afr looks rich.. Should i try to remove some spark ignition at WOT to clarify the problem? I also used another boost meter,does the same thing. M50B20nv with eaton m65,intercooled....
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