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Registered
Join Date: Jun 2001
Location: Sweden
Posts: 5,911
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does 930 have BOV?
Hi there!
Is there any blow-off valve on 930? There is external wastegate that controls boost by bleeding exhaust gases, but on throttle liftoff you'll have turbo spinning, trying to blow into closed throttle which should cause overpressure and turbine-stall. On the other hand, i don't know if throttle is before or behind turbo on 930. If it's before turbo, than turbo would try to suck trough closed throttle which isn't so bad except that it would deccelerate turbine rapidly. Can somebody enlighten me , please. (Reason for this is that my other turbo-car, a Saab, has recirculation BOV which helps turbo spinning for a while even when you lift of the throttle but i never found anything like that on my P-car) |
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06-14-2001, 12:45 PM
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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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beepx2,
Yes, there is a blow-off valve on the 930. The order of operations is turbine, blow-off valve, throttle. Under trailing/lift throttle conditions, the valve returns charge air back to the turbine in an effort to keep it spinning (this was a dubious plan, as a popular aftermarket accessory is a simple blow-off-to-atmosphere valve). If you pop your decklid and look under the CIS maze, you'll see a big alloy brick that is your intake casting- the pop-off is a very large part of this casting. -d [This message has been edited by dtw (edited 06-14-2001).] |
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06-14-2001, 05:13 PM
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