Bov Causing Shudder

[Lakes101]

This is true but a lot of work to cover an issue that the stock bov or turbosmart plumb back will sort out! I have the kompact one on mine with no issues at all

[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 much where we have landed on this?

[Reaperblitz]

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 December 18, 2015 by Reaperblitz

[Trex]

  On 18/12/2015 at 4:04 AM, Artwear said:

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]

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.

Edited December 18, 2015 by conan7772

[YangLIU]

  On 18/12/2015 at 7:00 AM, conan7772 said:

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 December 18, 2015 by YangLIU

[scotty nm35]

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]

no, only have stock kpa gauge.

had shudder before too with the stock turbo

[conan7772]

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.

Edited December 24, 2015 by conan7772

[scotty nm35]

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]

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.

Edited December 25, 2015 by conan7772

[Lakes101]

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

[Lakes101]

like this one

[Daleo]

I fitted a turbosmart compact to mine today; no shudder, no pigeons, but it is a bit louder than a stocker.

What pressure is the stock spring, and what colour would it be?

[Lakes101]

Hey Dale think it green and pink mate 14 psi.... I've had mine for a while a few pigeons but no real dramas

[Lakes101]

Hey Dale think it green and pink mate 14 psi.... I've had mine for a while a few pigeons but no real dramas

[conan7772]

Hey Nathan, Is that actually Nissan adapter and did you find it in Aus ?

I've only found one for Subaru/Mazda that looks like that.

Edited December 25, 2015 by conan7772

[conan7772]

here's then Nengun kit

[Lakes101]

Yeah mate it is from eBay Nissan bov adapter I'll post a few links

[Lakes101]

http://www.forcedinductionsonline.com/index.php?route=product/product&product_id=852. The Mazda ones are the same as Nissan ones mate. Guess advertised as Mazda MPs because it's a more common car