i need proof on "BOV"s

[Xistant]

please someone find me some prooft that they protect your vehicle,
as i beg the differ

not starting a flame, i just want people, to explain there veiw on a bov,

i know i won't be having on shortly,


anyhow,,

rip it up ladays!

[JDM hachi]

doesn't letting out this air stop reversion back to the turbo, this reversion is what is said to cause wear, funny how some manufacturers dont always fit them though (ie ca18).
matty.

[Xistant]

or thr rb30

[Ben Wilson]

Sit back, get a beer and have a look at this thread on ausrotary:

http://ausrotary.dntinternet.com/for...ic.php?t=17113

enjoy

[DigitalPho3nix]

please someone find me some prooft that they protect your vehicle,
as i beg the differ

Don't know about proof mate, but most STOCK turbo cars already come with a form of 'blow-off valve'. In stock form, a plumb-back valve is fitted as opposed to the atmospheric-venting valve (this one makes the whoosh sound).

Without this valve, a turbo will not last anywhere near as long as a turbo with a 'bov', as high air pressure will put stress on the turbo blades IN THE WRONG DIRECTION, and if left unchecked pieces of turbo will fly back into your engine.

If you beg to differ, why do car manufacturers put them on stock?

[Xistant]

Don't know about proof mate, but most STOCK turbo cars already come with a form of 'blow-off valve'. In stock form, a plumb-back valve is fitted as opposed to the atmospheric-venting valve (this one makes the whoosh sound).

Without this valve, a turbo will not last anywhere near as long as a turbo with a 'bov', as high air pressure will put stress on the turbo blades IN THE WRONG DIRECTION, and if left unchecked pieces of turbo will fly back into your engine.

If you beg to differ, why do car manufacturers put them on stock?

not all car manufactuers

[Ben Wilson]

why do car manufacturers put them on stock?

To reduce noise, a plumb backed valve will eliminate the chuff-chuff-chuff sound that the air going back through the blades causes...

[ITS-18T]

doesn't letting out this air stop reversion back to the turbo, this reversion is what is said to cause wear, funny how some manufacturers dont always fit them though (ie ca18).
matty.

Just on this note;

I own a CA powered car. As mentioned they didn't come with a BOV from factory. I have tried a couple different configurations, actually just this morning i installed a turbosmart type II BOV, it vents to the atmosphere.

Keeping an eye on the boost gauge, i have noticed that while running the BOV i lose all boost as soon as i release the throttle. This means that between gear changes, unless i'm flat shifting i have to spool the turbo back up again. When running no BOV, this is definately less of an issue as the IC piping holds boost pressure for longer, as can be noted on the boost gauge.

As that thread on ausrotary states, in the RX7 manual it states that the stock plumback BOV is in place due to it's noise reduction (i.e. preventing the 'flutter' of the pressurised air coming back through the compressor).

This is just my view on the issue from my own personal experiences. I will be removing the BOV this afternoon.

The noise they make really does grow old quickly as well.

[myne]

ITS-18T part of the BOV's function is to PREVENT the turbo spooling down.
By releasing the gas, it prevents the air piling up and slowing the turbo down.
It will momentarily lose boost but without it, there should be a flat spot as the turbo regains lost rpm. Because it's not slowing down, it should be pumping the same amount of air -albeit to no effect- but when the BOV closes, it should build up again quite quickly.

[ITS-18T]

I just stated that this is from my own experience.

[JZA70 R]

please someone find me some prooft that they protect your vehicle,
as i beg the differ

How about you prove otherwise?

[Selk]

hav a look on how stuff works

[o_man_ra23]

Putting a plumback BOV which plumbs to the manifold before the turbo helps prevent a vacuum forming on the engine side of the turbine wheel when going from on boost to zero throttle(gear change), which is one cause of turbo oil seal failure. Also it does keep the turbine running at a greater velocity, helping to regain boost after gear shift quicker.

Thats some of the theory behind a BOV. Personally I will be running a plumback BOV... for the reasons stated above, and for the reduced noise compared with an atmo BOV.

Cheers, Owen

[Nim]

ITS-18T, is the turbosmart BOV an atmo BOV? As I understand it, the CA18DET has an AFM. With an atmo bov, the ECU will think the engine is still getting full air, and will do some strange things with the injectors, which could be causing your problems with power and boost building back up.
Without a MAP sensor, an atmo bov will make your engine run rich between shifts.

Anyway, you'll notice that most (if not all) newer turbocharged cars come with BOVs. The old ones may not have come with it to reduce cost. The SR20DET does have a blow off valve.

[EldarO]

BOV's on AFM powered engines cause all sorts of problems apparantly, it stuffs the readings around royally.

Im about to install a 7MGTE into my MA70, the use of a BOV has not been recoommended, however im going to run one temporarily to see what the side effects are.

Eldar.O.