@ what rpm does your BOV release?

[go_n_low88]

Driving around in my car the past few days, it feels to me like the bov is releasing too soon. I installed a Stiffer spring and that seems to have helped. Just wondering @ what rpm most peoples BOV are releasing? Looking at my rpm I am at about 3700-3800RPM which seems kinda high to me, but maybe I'm wrong.

[Brando13]

Mine releases at any rpm as long as I have boost pressure. It really shouldn't release until you let off the gas @ boost

[go_n_low88]

Mine releases at any rpm as long as I have boost pressure. It really shouldn't release until you let off the gas @ boost

hmmmm. it actually requires me to reach at least 3500 rpm before it releases while letting off the gas. If im driving around @ 2500rpm the bov does not release. Also my boost pressure does not build till then.

[Brando13]

example. I have a turbo xs rfl...... @ 3 psi boost and I close throttle I hear a little woosh. @ full 14 psi its a 115 decibel blast that makes people @ bus stops jump lmao. I know I'm horrible

[Brando13]

hmmmm. it actually requires me to reach at least 3500 rpm before it releases while letting off the gas. If im driving around @ 2500rpm the bov does not release. Also my boost pressure does not build till then.

No pressure. No blow off. Simple as that. Need a certain amount of pressure to hear it though. If it was stick open or opening prematurely you'd be losing boost pressure in your manifold

[go_n_low88]

No pressure. No blow off. Simple as that. Need a certain amount of pressure to hear it though. If it was stick open or opening prematurely you'd be losing boost pressure in your manifold

Definitely not Stuck open.. At idle i listened for any air escaping and tension on plunger release seems to be perfect. BTW: I,m using a Blitz ss BOV

[theDOM]

3000 RPM..

[bellis_GTR]

My friend has a 02 wrx and when hes around 3000-3500rpm his bov doesnt go off its just a turbo flutter sound. But when he gives it to about 4000 and up the bov releases. Could he have a circ problem? Also he makes about 5 psi at 3000-3500rpm and the car is on strock boost.

[Skym]

My car does it with stock BOV. Flutter = compressor surge and is not good for CHRA on turbo. What has happened is the boost feed hole (quick release function of BOV) on the bottom of BOV is blocked, so it uses only vacuum from manifold at top of BOV and pressure in intake pipe to force valve open. More boost = more force in intake piping to open valve hence why it works better at higher boost levels.

I bought a Synapse BOV, like R32 GTS-T in link below to solve the problem -

http://www.youtube.com/watch?v=H0OBVk_UTMI

But still need a few parts before I can install it, which is frustrating. I like the sound of Synapse BOV on a Skyline.

[M13]

My bov sounds sexy when full boost.



RPM has no relevance to BOV opening. You could be no load (no accel) and be at 5500 rpm and have vacuum.

Boost on followed by off (TB closing) is what makes BOV's open if they are working right.

[DarkCaporaL]

My car does it with stock BOV. Flutter = compressor surge and is not good for CHRA on turbo. What has happened is the boost feed hole (quick release function of BOV) on the bottom of BOV is blocked, so it uses only vacuum from manifold at top of BOV and press in intake pipe to force valve open. More boost = more force in intake piping to open valve hence why it works better at higher boost levels.

I bought a Synapse BOV, like R32 GTS-T in link below to solve the problem -

http://www.youtube.com/watch?v=H0OBVk_UTMI

But still need a few parts before I can install it, which is frustrating. I like the sound of Synapse BOV on a Skyline.

I've always heard that flutter (off throttle) wasn't a big deal as compared to compressor surge (while boosting).

The stock recirc configuration is prone to flutter when releasing throttle at low RPMs (my car still has stock and it does it).

I just can't imagine Nissan doing a flutter recirc system that would break turbos from factory.

[Skym]

Both are bad for CHRA on turbo.

Here's what the worst compressor surge sounds like -

http://www.youtube.com/watch?v=nCj6Spwl1CU

My car does it because stock BOV is modified to not leak. Boost graph on dyno graph shows no leaks (boost keeps rising up to 12psi) with a bigger turbo.

[NismoS-tune]

hmmmm. it actually requires me to reach at least 3500 rpm before it releases while letting off the gas. If im driving around @ 2500rpm the bov does not release. Also my boost pressure does not build till then.

Soo what's the problem? sounds like a regular single turbo car... No boost, no bov

[NismoS-tune]

I forgot why it was doing that but it was something about tuning a certain area where the car never goes into or something? Dunno.

[go_n_low88]

Soo what's the problem? sounds like a regular single turbo car... No boost, no bov

Want to make sure the blow back if BOV is not opening soon enough doesn't thrash my Turbo..