BOV Ajustment

[Guest RedLineGTR]

I have a hybrid BOV on a skyline r33 gtst it vents to Atmosphere and Plumback, the question is that when the spring is adjusted so it not tight lets say 3 or so turns from loose, when the turbo starts making boost at 2500 it makes a flutter noise and when higher than 3000 it's normal whoosh sound, when adjusted tighter at 2500 doesn't make that much noise maybe a little whoosh and a 3000+ normal whoosh..Is it okay to leave it softish or is it better to leave it abit tighter. The tighter it is, will it make the BOV shut faster??

Thanks

[dojobi]

I have a hybrid bov too, and I basically set it to as soft as I can go. I can't see any reason to have it tighter actually. It just flutters, like you say.

Can anyone give me a good reason to tighten it?

[Guest RedLineGTR]

It sound sweet, i also have a trust Pod, sounds crazy together. Just wondering what it's for and if it's needed to make the BOV close quicker, and are ther any problems with having it osft compaired to hard..ANyone wanna shed some light to the issue?

Cheers Rob

[Guest RedLineGTR]

BBBBuuuuummmpppp

[dojobi]

I might have a play with the settings on mine and see what sort of difference it makes.

BTW nice new avatar. The paint job on the car looks like an oil slick. It's awesome.

[red17]

The flutter ive been told is a bit of pressure hitting the turbo impellers when theres not enough air velocity for it to come rushing out of the bov in a hurry (eg over 3000). Obviously the pressure on the impellers is what the bov is meant to be preventing, however ive also been told at a low RPM its of little consequence.

I have a TurboXs BOV that has the same behaviour.

Red17

[Jengi]

It should be fine, I run a TurboXS BOV on my R33 gtst and the it does the job really well high up in the revs and the compressor flutter low in the revs should not damage the turbo. This is simply because there is not enough boost and it cannot expel the minimal amount of air via the BOV.

[dojobi]

OK, so even if the flutter down low won't hurt it, what is the benefit of tightening it? Does it make the car more responsive or something? I have mine set so there is virtually no flutter unless I'm only slightly boosting.

[Doctor]

Your BOV should be set to go off just over 0psi more. Any less than this you will be leaking at half throttle.

[dojobi]

Cool. That's the way I've got it set. It doesn't blow off until there's a bit of boost.