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Bov Causing Shudder

conan7772

By conan7772,
in Four Door Family & Wagoneers

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Ben C34
Ben C34

There's tinkering and then there is f**king around.

R31 POWER
R31 POWER

Turn your speakers down before listening hahaha. Sounds like thunder or a bomb going off when it opens.

Artwear
Artwear

Is it just me or has this thread gone full circle a few times? The best way to avoid shutter from an aftermarket bov is to tune to match or keep the stock one and avoid the shutter, is that pretty mu

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Artwear Contributor

Artwear

Posted
Posted

Is it just me or has this thread gone full circle a few times?

The best way to avoid shutter from an aftermarket bov is to tune to match or keep the stock one and avoid the shutter, is that pretty much where we have landed on this?

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Reaperblitz Enthusiast

Reaperblitz

Posted
Posted (edited)

I think that is the general consensus. Taking steps to ensure you don't have boost or vacuum leaks and checking for restrictìon pill or using proper hose that doesn't "suck in" may help but in the end it's use stock, a good adjustable one or get a tune ?

Edited by Reaperblitz
Trex Grand Master

Trex

Posted
Posted

Is it just me or has this thread gone full circle a few times?

The best way to avoid shutter from an aftermarket bov is to tune to match or keep the stock one and avoid the shutter, is that pretty much where we have landed on this?

nah. but. what about 'insert something irrelevant'

conan7772 Mentor

conan7772

Posted
  • Author
Posted (edited)

Yer, well my Turbosmart Kompact still shudders with the soft spring and I'm pretty sure it's opening on boost too.

Seem to have varying spool / boost levels

There was better spool with the standard spring.

The shudder is on pigeon sound, which means the BOV ain't releasing enough at low boost

The FV series valves are supposed to open more on vacuum than single spring types.

Worth trying , especially if it reduces strain on the shaft, and stops me spilling my coffee.

These are selling for over $400 from some sellers.

Scored one for $145

Just waiting on a 29mm recirc adapter from Nengun.

The trumpets unscrew and the adapters fit all three models.

See the fake has silver retainer ring on the base.

I also noticed the Greddy sticker is shit on the fake too.

The spring is way harder to push in and you can hear it grind when it travels.

I sent pics to Greddy, they confirmed it was a fake.

Looking inside the genuine one, the difference in quality is huge.

See how it goes.

post-25026-0-16278900-1450420872_thumb.jpg

Edited by conan7772
YangLIU Rising Star

YangLIU

Posted
Posted (edited)

Yer, well my Turbosmart Kompact still shudders with the soft spring and I'm pretty sure it's opening on boost too.

Seem to have varying spool / boost levels

There was better spool with the standard spring.

The shudder is on pigeon sound, which means the BOV ain't releasing enough at low boost

The FV series valves are supposed to open more on vacuum than single spring types.

Worth trying , especially if it reduces strain on the shaft, and stops me spilling my coffee.

These are selling for over $400 from some sellers.

Scored one for $145

Just waiting on a 29mm recirc adapter from Nengun.

The trumpets unscrew and the adapters fit all three models.

See the fake has silver retainer ring on the base.

I also noticed the Greddy sticker is shit on the fake too.

The spring is way harder to push in and you can hear it grind when it travels.

I sent pics to Greddy, they confirmed it was a fake.

Looking inside the genuine one, the difference in quality is huge.

See how it goes.

either fit stock back or tune the car, otherwise you will always get pigeon sound whatever you use which brand BOV/soft spring

also if you can develop some electric solenoid valve controlled BOV like modern VW/Audi/BMW/Benz, you can also get rid of the pigeon sound

Edited by YangLIU
scotty nm35 Grand Master

scotty nm35

Posted
Posted

My suggestion, block the kent off and see what the response is like. It is a good way to see what the boost is actually doing too. Do you have a good boost gauge? The only time I have seen shuddering is when the car is running over 20psi untuned.

conan7772 Mentor

conan7772

Posted
  • Author
Posted (edited)

Mutt,

The Nissan adapter faces the return either up or down.

Meaning I'll need an elbow off the bov, down hits the engine, up bonnet won't close.

Haven't dry fitted yet but it doesn't look good.

I'll have to make my own adapter I think like this one.

post-25026-0-14323300-1450944966_thumb.jpg

post-25026-0-72403700-1450947862_thumb.jpg

Edited by conan7772
scotty nm35 Grand Master

scotty nm35

Posted
Posted

I just fitted a stock M35 BOV into a 33gtst, bolts straight in, so I have no idea what's going on there...

The only car I have seen where I couldn't get rid of the juddering was actually running 21psi due to having a 1 bar actuator and still running the stock bleed circuit. What boost does it run on a big uphill stomp? If it's too much that will be your answer. the stock ecu is in protection mode and dumping fuel.

conan7772 Mentor

conan7772

Posted
  • Author
Posted (edited)

It mostly shudders when I back off at 3-5 psi

Here's the adapter I have.

It puts the vent up or down, not to the side where it needs to be.

Nengun sell one for the RB25DET with all the holes in line.

post-25026-0-23377400-1451023974_thumb.jpg

Edited by conan7772
Lakes101 Experienced

Lakes101

Posted
Posted

Yeah that is defiantly the wrong adapter plat you just need one where all the blots holes are in a strait line. Best look at your bov and where the bolt holes are and do some research into a suitable adapter

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