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::they allow the turbos to maintain maximum spin between shifts (quicker post shift recovery)
:I'm not sure that they do this really any better than the recircs - thats what they were designed to do also, releave the pent up pressure in the pipes between the turbo outlet and the throttle body therefore trying to keep the compressor spinning between shifts.depending on where the BOVs are installed, they can literally help PULL cold air through the turbos, keeping them spinning even more. remember, the BOVs are installed between the turbo and the throttle plates.
when the throttle plates are closed (BOVs open), there are two places for pressurized air to go; back through the turbo (compressor surge/reversion), or out the BOV.
By placing the blowoff valve as close to the throttle plates as possible, the air that is traveling under boost in one direction, will stay travelling in that one direction under venting. This helps the turbo stay most efficient during brief closed throttle venting.
By placing the blowoff valve close to the turbo, the air between the BOV and the throttle plate has to reverse to get out the BOV. Once you are back on throttle, you have to turn this air around a second time. I really don't think this is a huge issue tho. Also, the efficiency of the BOV needs to be taken into consideration as well. For LARGE spooling sick PSI turbos, all the common valves are too small to vent all the air out efficiently or completely. There are blow off valves available that have 2" diameter ports and larger. All commonly purchased valves I've seen are roughly 1" in diamter.
PETZ (member #003)
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