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Well I have been running on the stock volvo computer for the past month due to an issue with my EMS (still waiting on parts). Anyway I was experiencing inconsistent boost. So, I replaced the used MAC valve that I had installed with a brand new one. Well obviously the new valve responds differently because before the ECU had a chance to relearn I managed to hit a nice steady 11.6 PSI in 2nd gear. Within just a mile or two the ECU calmed the boost back down to the normal 7 PSI that I see every day and it is rock solid now. I was funny how fast the car was for those few seconds.

Anyway the verdict is that if you run the ebay MAC valve, they do wear out quickly in a PWM application like this.
 

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