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I haven't noticed any power loss.... but then when it's under boost I can't hear the compressor so..... for the price of them it's probably worth just replacing it if I'm taking it apart to inspect.

On my A1R the compressor is fed air from the manifold which is after the turbo and intercooler. Don't know if this was a change to the A1 or the A1R but definitely the compressor is post turbo.

Part of the problem is I'm not sure exactly what the valve does - it seems to be there to shut off the inlet port during a purge signal from the governor. I'm not entirely clear on the mechanics of why blocking off the inlet to the dryer during a purge is desirable..... the compressor is already...

I have serviced the dryer cartridge on my truck. In my reading and travels I come across this "turbo protection valve". I can't find much in the way of information related to this. The usual scumbags and others list this part...