No Compression Surge Or "flutter" With Blocked Bov

[crankyfrank118]

Hey guys

Just a question out of curiosity.

Just for fun to see what it sounded like, I took off and blocked the vacuum line to the BOV to see what it noise would come out. But all i got was the standard gush noise through the pod filter. Last few cars i did this with I got the "fully sick VL turbo flutter" .

What does this actually mean? If there a leak or issue somewhere? Stupid topic, i know but got me wondering.

thanks!!

[XGTRX]

What car

[r32-25t]

With just taking the vacuum line of the blow off valve all your doing is allowing it to open easier

[crankyfrank118]

  On 25/05/2016 at 6:35 AM, XGTRX said:

What car

R33 Gtst

[niZmO_Man]

Pretty sure you have to block the "intake" side of the blow-off valve.

[XGTRX]

  On 25/05/2016 at 6:40 AM, r32-25t said:

With just taking the vacuum line of the blow off valve all your doing is allowing it to open easier

^^^^^ this

you need to block the pipe to dose.

Do it man. Sounds sik

Edited May 25, 2016 by XGTRX

[Missileman]

Removing the vacuum line will help keep the valve closed. Whether it leaks is another matter.

[Trex]

why would you block the bov?

block the front of the turbo for ultimate sutututu

[Trex]

But in all seriousness. I don't use any bov, never will again. They all leak and cause serious lack of power around 10-30% throttle.

That's just my personal opinion

[Missileman]

Actually they're not that bad, a bit of molly lube on the stem of the valve helped my stock rb20 recirculation valve hold close to 30 psi

Edited May 25, 2016 by Missileman

[r32-25t]

  On 25/05/2016 at 7:57 AM, Missileman said:

Removing the vacuum line will help keep the valve closed. Whether it leaks is another matter.

no the pressure in the intake pushes the valve open because it is greater then what's above it

[GTofuS-T]

Can't believe @Dose Pipe Sutututu hasn't noticed this yet...

[Trex]

  On 25/05/2016 at 8:09 AM, Missileman said:

Actually they're not that bad, a bit of molly lube on the stem of the valve helped my stock rb20 recirculation valve hold close to 30 psi

I've had a few, i noticed it on all. I tried a few things like what turbosmart suggest.

I am using an automatic, so it could be more pronounced because of this.

[Ben C34]

  On 25/05/2016 at 7:57 AM, Missileman said:

Removing the vacuum line will help keep the valve closed. Whether it leaks is another matter.

Nope. Boost pressure from the manifold helps keep it closed.

Removing the line makes it leak on boost, meaning the turbo has to work harder.

[Dose Pipe Sutututu]

Oh shit I have, bruh youse need to take off ya stock bov, cut up your favourite aluminium can and make a blanking plate using that. Then drill two holes and sandwich it between your BOV and BOV 2x bolt flange.

Fully sick ulleh, dose for days and make betches drop their panties

[Missileman]

  On 25/05/2016 at 8:10 AM, r32-25t said:

no the pressure in the intake pushes the valve open because it is greater then what's above it

I understand what you're saying, but the vacuum created when the throttle plate closes acts against the spring in the valve to open it, remove the vacuum line and the spring pressure alone is enough to keep the valve closed, or should be.

When I replaced my turbo I made up a pvc plug and pressure tested the intake, after I lubed the stem it easily held 20 psi

Edited May 25, 2016 by Missileman

[Ben C34]

But then the turbo will break when it spins backwards

[crankyfrank118]

Cheers all

[Missileman]

Oops my apologies , Ben, Brett, and xgtrx are correct, with the vac line removed and blocked the valve will leak. I'll slink off now...

[Trex]

  On 25/05/2016 at 8:53 AM, Missileman said:

Oops my apologies , Ben, Brett, and xgtrx are correct, with the vac line removed and blocked the valve will leak. I'll slink off now...

It will flutter in neutral with no load though