Quote:
Originally Posted by arrowem
Is a blow off valve needed? what does it do? where does it purge to?
Also, what are people paying for just the SC unit new? (not advertised, actual price)
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it would actually use a surge valve with a Procharger, and yes it is needed. On a Procharged setup the valve would be open at idle and high vacuum times like cruising. Vents the extra pressurized air that stacks up in the intake when you don't need it there. Under boost it closes and allows full boost, and then coming off of boost, like if you snapped the throttle shut, it re-opens and vents the boost (usually to atmosphere) and prevents damage to the blower.