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Its actually a good thing if they open at idle or anytime you aren't building boost(recirculating setup that is), it will give you much better throttle response and quicker spool.Most factory BOV recirculating setups are designed to do just that, thats why OEMs usually call them Compressor Bypass Valves.Ideally you'd want the BOV open anytime the boost is less than 0 psig, and open when the throttle plate closes of course.
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-Nulli Secundus-
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