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How do you guys have your blow off valve set?
Can It affect performance?

 
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what do u mean how do we have it set, do u mean where is it placed on the pipe and can that affect performance, i think placement only affects sound

 
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no, the adjustment screw

 
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no but if u set it wrong the turbo will get backspin.. i forget what its called.. but its pretty bad to do...ur supposed to set the BOV to the lowest seting and then move it up to the highest point until ur car doesnt bog... --- but thats just what i hear

 
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^^^ called Compressor Surge. The pressure builds back up into the compressor instead of escaping through the BOV.

 
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is ur car done and do u have it back

 
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compressor surge can lead to compressor stall.... meaning that your turbo actually stops spinning. Meaning that when you shift, you have the spool up your turbo all over again. Also compressor surge is bad for your thrust bearings and turbine shaft in the turbo.

Compressor surge can be caused by having the BOV adjusted too tight. But by adjusting it too soft, you can leak air while under boost.

Also placement of the BOV will also effect the performance of the turbo. The closer to the throttlebody the BOV is, the better. Because since you close your throttlebody while shifting, the pressure has to be relieved. If the BOV is down near the intercooler, the air has to actually change directions to relieve the pressure. But if it is right next to the throttlybody, then the air is still traveling in the same direction.

 
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thanks bc i wanted to know that info too

 
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no prob, im here to help everyone out. As well as relieve stress

 
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isn't the blow-off valve internal in the SF Kit? like in the turbo itself?

 
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ur thinking of the internal wastegate dood, and blow off valves are usually mounted close to the throttle body as u can get. when sf first came out with the kits i believe they were using internal wastegates, but i guess now u have the option of using an external wastegate, sounds good.

 
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yup

 
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chutch

 
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I read that some rally drivers keep their BOV's set to retain a few PSI in between shifts to reduce turbo, and there are no thrust bearings in the TD kit. Its a dual BB turbo.