BOV location and FMIC question
BOV location and FMIC question Runing an STS kit and will be adding a front mount and have a question about the location of the BOV. Can the BOV be located before the intercooler? Does it make a difference if the BOV is located before or after the intercooler or should it be closer to the TB?
Rick
The BOV serves more than one purpose, the first is to prevent backspin of the compressor, the second is to keep the motor from breathing boost in the seconds after you lift the throttle and consequently remove the fuel. Backspin will snap the shaft in the turbo and put unwanted backwards pressure on the compressor wheel, going lean has its obvious issues.
as long as the BOV is after the turbo and it works properly it will prevent backspin, both because its down stream and the inertia and flow of the charge air is flowing away from the compressor, it will naturally go out when pressure is dumped. moving the valve closer to the TB will keep it out of the motor too.
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Verdad Gallardo the intercooler is going to heat soak anyway because the BOV stays closed until you lift, so if anything it will cool the FMIC when the pressure drops suddenly. do you really think that 2 or 3 seconds of discharge is going to keep the IC from heat soaking after you just drove down the road for 5 min strait?
Rick
^^^ah ok, I dont think the heat soak would be enough to care about though. If the air is passing through the compressor but not being compressed then the only way it will be heated is by A: friction on the pipes and housing and B: the turbo itself will be hot from exhaust and stuff. long story short, put it where ever you want it after the turbo lol
Thanks, I wasn't getting rid of enough pressure with the one. It would back spin my turbos at 20psi. I upgraded to 2 of them when I put the new turbos in. Also used anti surge housings.
Teching In
Joined: Jun 2010
Posts: 27
Likes: 0
From: West Fargo, ND
I know you already figured it out but i just place the bov/bov's where ever i can fit them or want them to be in the engine bay. I really can't see there being much of a difference where there placed performance wise.
On The Tree
Joined: Mar 2006
Posts: 150
Likes: 0
There is no reason to blast that unused hot air through the intercooler.
Some have posted they see no affect on the IAT’s , but if they where
auto crossing or road racing where they would be cycling the hell out of the BOV
then they would see the benefits of BOV placement.
Decisions like this all to often are made for esthetics reasons and
the engineering of the system never crosses there mind.
