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iTrader: (1)

My boost is 0.6 max one minute then 12psi next minute ? today it keeps hitting 16psi and has never done that before ! in 4th gear with ya foot planted it goes from 0.8 to 10 to 9 to 12 and you can feel car boosting on and of . i have checked plugs and coils all ok , have cleaned maf and boost soleniod and no difference , changed all vacumn pipes and yes used the original restrictor , checked codes - none , oil ok and even changed ecu and no difference ANY IDEAS ?? car is uk 94 wagon with td05 , center decat + back box , hks induction , arc bov and standard v7 chipped ecu but now using borrowed z4 and no difference at all , im getting peed of now !!!

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iTrader: (1)

Forgot to mention but have also replaced engine temp sensor as was getting code 21 a couple of weeks ago ! any ideas