Sandy Posted October 25, 2005 Share Posted October 25, 2005 Could someone explain in layman terms what one is and what it does? I only ask because my boy racer (and much younger) half brother has fitted one to his J Plate MR2 and I was wondering what it did appart from make a 'whooshing sound' on gear changes? He seems to think its improved mpg though Its not the days in your life ..........But the LIFE in your days!! ;0)) Link to comment Share on other sites More sharing options...
Support Team Shaun_E Posted October 25, 2005 Support Team Share Posted October 25, 2005 They are fitted to turbocharged cars to release the pressure from the turbo when the throttle is lifted (i.e. closed). The back pressure caused by lifting the throttle can cause the turbo to stall (or even break) - by releasing that pressure, the turbo keeps spinning in closed throttle conditions and can therefore provide full boost again more quickly. Dump valves can be recirculating - i.e. plumbed back into the inlet, or atmospheric. It is the atmospheric ones which make the characteristic "whoosh" - recirculating ones tend to make a more muffled sound. Yellow SL #32 Link to comment Share on other sites More sharing options...
jackb_ms Posted October 25, 2005 Share Posted October 25, 2005 its a pressure relief valve Jack Emily, The Very Yellow 21 Link to comment Share on other sites More sharing options...
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