Quote:
Originally Posted by speedshopmike
most oem setups do not use blowoff valves.
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Most OEM cars use MAF-based PCM's and thus use recirculating blowoffs so metered air is not lost (unlike aftermarket dump to atmosphere setups)... turbo cars from Volvo, Subaru, Mitsubishi, Saab, Audi, VW, etc, all use recirculating type blowoff valves. I can't think of any OEM turbo application that didn't use a blowoff valve of some sort except for mid 80's Buick Grand Nationals and some other 80's stuff. Any 90s and up factory turbo car I have ever worked on or checked out all used a bypass/blowoff valve of some sort.
If the OEM's could save a few bucks and skip the blowoff valve, believe me, the beancounters would axe them... so the engineers have a good reason to put them there.