another bov question

[Guest]

Hey, Car is 95 BG5 Legacy, what size bung do you need to block off the bov return pipe? 34mm? And I take it the bov fitting will be the same size.

Also I fitted a boost gauge on the weekend, notice the car is boosting 10.5psi on first turbo and goes up-to 15.5 psi when 2nd turbo kicks in - is this the standard boost level?

Thanks for your help!

[ReubenH]

19mm for a BG.

I recommend not getting a full atmosphere BOV though.

[Guest]

 ReubenH said:

19mm for a BG.

I recommend not getting a full atmosphere BOV though.

Thanks!

Yep I know the ecu calculates for the air to plumb back in after the AFM, just my bov has done over 230,000kms and its starting to stick, keen to go for something after market ;p

[Hailz]

 ReubenH said:

I recommend not getting a full atmosphere BOV though.

Hey whats your reasoning for this? I'm looking into going down the aftermarket bov road and would love to know any pro's/cons?

[Guest]

 Hailz']

[quote name='ReubenH said:

I recommend not getting a full atmosphere BOV though.

/quote]

Hey whats your reasoning for this? I'm looking into going down the aftermarket bov road and would love to know any pro's/cons?

The ecu calculates for the air to plumb back in after the AFM - sending the air to atmosphere cause's the car to briefly run rich as ecu doesn't know you sent the air somewhere else and not back into the system.

Also stock bov's are design to be soft and leak a little air. This helps to stop the turbo surging and also helps the turbo to stay spinning as air is not going back and forcing the turbo to surge (spin the opposite way).

I have an R33 GTR bov I plan to install, these are the best bov you can get, they hold up 25+psi, flow large amounts of air and wont cause the turbo to surge _b

(Although I do love the crisp sound of a good bov )

[G-unit]

as for the boost, sounds like normal

[ReubenH]

Yeah, basically full atmosphere ones tend to make the cars stall at intersetions and stuff, or nearly stall.

My recomendation, GFB hybrid. I ran one for about a week, it still made the atmosphere noise, but i had NO problems whatsoever with it. 50/50's are great, discrete and problem free.

[smokn4]

 ReubenH said:

Yeah, basically full atmosphere ones tend to make the cars stall at intersetions and stuff, or nearly stall.

My recomendation, GFB hybrid. I ran one for about a week, it still made the atmosphere noise, but i had NO problems whatsoever with it. 50/50's are great, discrete and problem free.

my BOV is fully vented to atmos' ( twin trumpets ) and my car runs as per normal at intersections / dont stall etc, idles at round 11000 rpm seems to be sweet weather its set to 'full blast mode' or on 'stealth'

so i dunno if thats fair to say??

its a GFB stealth_FX and running a standard V2 RA ecu ???

[RAYDEO]

i never has any issues with stalling when running a turbo smart BOV in my GTB.

Ran it for a good 6 months till i got sick of it lol...

got soem nice pops and bangs from the tail pipe too... although that also got old fast.

[Guest itsgotgo]

just buy a zerosports intake pipe,the standard bov will make plenty of noise.

[Hailz]

 itsgotgo said:

just buy a zerosports intake pipe,the standard bov will make plenty of noise.

What makes you say that? I talked to the zerosports distributor and he said adding the intake pipe alone will do nothing but dress up the engine bay, have you had a different outcome?

[pl0x]

 RAYDEO said:

i never has any issues with stalling when running a turbo smart BOV in my GTB.

Ran it for a good 6 months till i got sick of it lol...

got soem nice pops and bangs from the tail pipe too... although that also got old fast.

gtb as in bg or bh?

ive heard of heaps of bg era having full VTA

But for bh/be legacys i dont think its good

and i was recommended by GFB to only run 50/50

[shrug]

just make sure ur bov has a hard spring and not open at idle causing air leaks and that should solve the stooling and hunting idle issue!

[Guest boostin]

 smokn4 said:

idles at round 11000 rpm

Oh choice bro!! You got a rotor au!! ;D

[Guest itsgotgo]

 Hailz']

[quote name='itsgotgo said:

just buy a zerosports intake pipe,the standard bov will make plenty of noise.

/quote]

What makes you say that? I talked to the zerosports distributor and he said adding the intake pipe alone will do nothing but dress up the engine bay, have you had a different outcome?

With a pod filter you can hear the standard factory bov venting.

The zsports intake has been proven to increase intake,not just dress it up

[Ryan]

I've got a GFB Hybrid on my RS-B, 50/50 venting and seems to work sweet as, loud enough for me.

[Guest]

ive got a greddy type rs, full venting, hasn't given me any problems.

me wants a HKS SSQV though

[GT_Head]

I have a racepro type s full vent on a 94 GT and when it is cold the revs will die and almost stall pulling up to intersections. I will plumb it back at some stage but it's not really too much of an issue.

[pl0x]

 Omegah said:

ive got a greddy type rs, full venting, hasn't given me any problems.

me wants a HKS SSQV though

How long you had it on full vent for?

[mazdahard]

I used to have my gfb hybrid on full vent and it ran fine more lag between shifts though even when I had it half plumbback it was still loud as haha

[pl0x]

 rsb_leggy said:

I used to have my gfb hybrid on full vent and it ran fine more lag between shifts though even when I had it half plumbback it was still loud as haha

Yea yours was a V3/4 AFM, Im wondering about omegahs because the b4's ahve same AFM as V5/6 which are the ones known to be problematic

[mattapo]

Also putting a non plumb back bov on can give you a dead spot between first and second gear. It's a pain in the ass. Ya can get the odd back fire to.

[mazdahard]

 pl0x']

[quote name='rsb_leggy said:

I used to have my gfb hybrid on full vent and it ran fine more lag between shifts though even when I had it half plumbback it was still loud as haha

/quote]

Yea yours was a V3/4 AFM, Im wondering about omegahs because the b4's ahve same AFM as V5/6 which are the ones known to be problematic

oh I didnt know that I had the orange sticker afm if that makes a difference

[pl0x]

yea ive seen PLENTY of bg5/bd5 with a venting BOV's that run fine,

not many be5/bh5 round here/that mates have let alone ones with bov's lol

[Guest boostin]

Twin turbo's seem to run ok with atmo bov's though. Single turbo's don't really like them.