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Bov Recently Installed

PIOTREK

By PIOTREK,
in Engines & Forced Induction

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PIOTREK Proficient

PIOTREK

Posted
Posted

Hey guys I just installed a vee port turbosmart bov, and now my car has more flooder than a vl haha nar serious why does it do it so hard?

The othe thing is that there mild back fire on the mid range boost, however on full boost it's fine.

I have it currently on the softess setting, should tighten it? Cause really I don't to be sounding like the biggest stutututu out there plus the backfire is a worry?

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https://www.sau.com.au/forums/topic/267255-bov-recently-installed/
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Punk72 Community Regular

Punk72

Posted
Posted

did you get instructions with the bov, It should enplane all that in there, Mine is a gfb gt hybrid and according to the instructions

you should undo the adjustment screw one full turn, and keep doing that till it stops.

PIOTREK Proficient

PIOTREK

Posted
  • Author
Posted

ok guys problem solved, all i did was tighten up the BOV. It stopped floddering like crazy and backfire is now gone. Tomorrow i will take it for a proper drive on full boost to confirm.

Btw if the BOV is on too tight is that bad??

PIOTREK Proficient

PIOTREK

Posted
  • Author
Posted

I don't mean to question your, but can you shine some light on this. It's adjustable tention in the spring, so higher pressure aka boost would require more tention otherwise the valve would be opening to early? If it's too tight, the valve isn't ofening enough???

**RB2530** Proficient

**RB2530**

Posted
Posted
Come on guys so many people with bov and no answers? Should I wind it up all the way?

Peter,

What makes you 'entitled' to an answer?

The reason no-one has answered you could be one or all of the following reasons:

1. Your BOV is an vent to atmosphere BOV. The skyline ECU is not designed to cope with vent to atmosphere and will overfuel on gear changes. This has been covered 100's of times on these forums. Every 2-3 days someone asks this question...The same f*&^in question. Do a search!!

2. Many people hate atmo BOVs. All they do is attract attention.There is no benefit apart from pure rice factor..As if imports don't get too much attention already..Now, every cop think any BOV is illegal...We can't help that they don't understand the difference between legal and illegal BOVs...Fact is, thanks to the atmo BOVs we are even further behind the 8-ball and guilty until proven innocent...ie trying to convince the cop that unlike most other atmo rice sounding BOV cars on the road, mine is actually legal cause it is plumbed back. Too complicated for your average HWP officer...

3. Turbosmart gear comes with good instructions that cover your exact question...

Not trying to be harsh, just explaining why no-one answered...

Turbz RB-25 Experienced

Turbz RB-25

Posted
Posted

Mate, the reason your car was fluttering wasn't because your BOV was too loose, it was because it was too tight.

You probably loosened it, and now it is able to expel the air, rather than the pressure going back through your turbo.

Be careful but, having it too loose may expose it to leaking under boost (that's if you got it way loose), however, having it too tight will cause compression surge i.e. flutter.

PIOTREK Proficient

PIOTREK

Posted
  • Author
Posted
Peter,

What makes you 'entitled' to an answer?

The reason no-one has answered you could be one or all of the following reasons:

1. Your BOV is an vent to atmosphere BOV. The skyline ECU is not designed to cope with vent to atmosphere and will overfuel on gear changes. This has been covered 100's of times on these forums. Every 2-3 days someone asks this question...The same f*&^in question. Do a search!!

2. Many people hate atmo BOVs. All they do is attract attention.There is no benefit apart from pure rice factor..As if imports don't get too much attention already..Now, every cop think any BOV is illegal...We can't help that they don't understand the difference between legal and illegal BOVs...Fact is, thanks to the atmo BOVs we are even further behind the 8-ball and guilty until proven innocent...ie trying to convince the cop that unlike most other atmo rice sounding BOV cars on the road, mine is actually legal cause it is plumbed back. Too complicated for your average HWP officer...

3. Turbosmart gear comes with good instructions that cover your exact question...

Not trying to be harsh, just explaining why no-one answered...

Yer look stress, point taken about the search part.

But a BOV reduces back pressure on the turbo so there is a point if the car is boosted well over stock?

PIOTREK Proficient

PIOTREK

Posted
  • Author
Posted
Mate, the reason your car was fluttering wasn't because your BOV was too loose, it was because it was too tight.

You probably loosened it, and now it is able to expel the air, rather than the pressure going back through your turbo.

Be careful but, having it too loose may expose it to leaking under boost (that's if you got it way loose), however, having it too tight will cause compression surge i.e. flutter.

Well thats wat i thought too, it was set to the softest setting. Once i thightened it up, the problem was sloved. Still need to double check cause it was too wet last night to drive it properly

Turbz RB-25 Experienced

Turbz RB-25

Posted
Posted
Well thats wat i thought too, it was set to the softest setting. Once i thightened it up, the problem was sloved. Still need to double check cause it was too wet last night to drive it properly

In that case, make sure that your vaccum hose actually has vaccum. Also, open you BOV (i.e. untwist it until the spring pops out, and lube the inside up with grease to ensure the valve can open and close smoothly.

Your car should not be fluttering with a soft spring on the BOV, something is wrong.

(OO)SKYLINE(OO) Grand Master

(OO)SKYLINE(OO)

Posted
Posted
Yer look stress, point taken about the search part.

But a BOV reduces back pressure on the turbo so there is a point if the car is boosted well over stock?

It is designed to prevent compressor surge = When the air goes back into the turbo and forces the turbine blades to spin the other way, which gives you that "Dose" noise.

That's not good for your turbo.

A stock GTR BOV can handle up to 300+ kW's running 1.2 Bar boost (17.4 Psi) easy...

Turbz RB-25 Experienced

Turbz RB-25

Posted
Posted
It is designed to prevent compressor surge = When the air goes back into the turbo and forces the turbine blades to spin the other way, which gives you that "Dose" noise.

That's not good for your turbo.

A stock GTR BOV can handle up to 300+ kW's running 1.2 Bar boost (17.4 Psi) easy...

It doesn't actually make the blades spin the other way mate.

It is merely pressurised air passing through fast spining fins. There is no way 7 PSI could make blades that spin at over 10,000rpm spin the other way.

(OO)SKYLINE(OO) Grand Master

(OO)SKYLINE(OO)

Posted
Posted
It doesn't actually make the blades spin the other way mate.

It is merely pressurised air passing through fast spining fins. There is no way 7 PSI could make blades that spin at over 10,000rpm spin the other way.

Yeah for sure...

Thanks. :P

I just wanted to point out the fact that not having a BOV is bad for a turbo car and he could have stuck with his stock one OR I should have said upgrade to a GTR one.

**RB2530** Proficient

**RB2530**

Posted
Posted
Yer look stress, point taken about the search part.

But a BOV reduces back pressure on the turbo so there is a point if the car is boosted well over stock?

Peter,

You have misinterpreted my response. I am all for BOVs. They have a purpose irrespective of much boost you are running. Nissan didn't put the stock one on just cos they felt like it.

I was pointing out the problems with atmo venting BOVs. Plumbed back BOVs are perfectly fine. There are many brands available which can be plumbed back...even Turbosmart...

PIOTREK Proficient

PIOTREK

Posted
  • Author
Posted

yer look i understant where you are coming from!!! but i got a bit bored of the the basic mods on it, i doubt that i'm gonna keep it on for long but its fun. Since i bought it on a week ago a already got a few other bits and pieces to make it quicker. Just a really fun car

Thanks for your input

krzysiu Grand Master

krzysiu

Posted
Posted
Peter,

You have misinterpreted my response. I am all for BOVs. They have a purpose irrespective of much boost you are running. Nissan didn't put the stock one on just cos they felt like it.

I was pointing out the problems with atmo venting BOVs. Plumbed back BOVs are perfectly fine. There are many brands available which can be plumbed back...even Turbosmart...

The main reason nissan put on a plumb back bov was to meet emmisions standards. I run an atmo bov. Yes some cars react badly to them and some dont. Its strange but its true. Had one r33 that you couldnt drive with an atmo bov cuz it would just stall all the time. Got one on my current R33 and i have had no problems with it and its been over a year now.

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