I have on my desk, a brand new, shiny red VTA (Vent To Atmosphere) BOV (Blow Off Valve).

I've been looking for fitting instructions that dont just say "its easy" or "5 minute job" hehe, but in my search, I wandered upon many good articles stating the advantages and disadvantages of having one fitted.

My conclusion is simply this...

If a VTA BOV was good for your car, Subaru would have fitted one as standard.

My only reason for thinking they would not, is so that the 'Woooshing' upon closing of the butterfly is not to everyone's liking and so mass-market-appeal wins the day by choosing to not have something that makes noise.

So.....now I'm very 50/50 about fitting one.

I've made no alterations or modifications to the engine apart from a full cone induction kit. This alone makes some amount of wooshing, and it makes me wonder if I should bother with a BOV at all.

Whats your take on it?

(Ps. How do I start a Poll on this thread? 2 answers BOV's are good/BOV's are bad)

 

My Apexi ik makes the standard recirc valve louder.
Used to have a Blitz vta on my 93wrx and after a time it stared fecking up the fuelling causing the car to stall so off it came.

When you start a new thread it has the option to make a poll

 

I would put it here:




























eBay.co.uk - dump valve, dump valve Engine Tuning Parts items at low prices

 

Ditch it! Make SN happy, lol

Ns04

 

 

What can I say Hmmmm NO NO NO NO follow above link and say Bye Bye

 

I tend to chop and change with bov's, for the last 6 months or so, ive had the standard re-circ on with an hks induction kit, which sounds great but every now and then i fancy a change, so on goes the HKS ssqv, until i get bored then off it comes again, lol

 

I'm running a TD06 with no BOV at all. Makes a peculiar sound (turbo stall) and the car judders violently on occassion on lift off - takes some getting used to I can tell you!

 

So....7 replies....6.5 people say no....Hmmmm..... interesting so far

 

Love the sound of my HKS ssq

 

i was in the same boat mate was not sure as people on here seem so against them.
anyway I thought each to there own I want one so I got one
blitz dv10
I have a my99 uk standard apart from back box and it has made no difference to tick over,idle or anything really in fact it does seem to make changes better for some reason.
Hey if you want one have one its no big shakes to put your re-circ back on
simple.

 

Now THAT'S just the sort of educated, unbiased reply that all forums, all threads and all topics need!

Cheers Wraggy! I think I will just go ahead and have the boyo fitted and see what I make of it from there.

Fair play to ya. (P.s. Your car is well nice! Good luck with it!!!)

 

No problem mate thanks for the comment.
As for fitting it im not sure how your re-circ one is but if its bolted to the front of the intercooler like mine was then its just a straight forward swap 2 bolts re-fit vaccuum hose onto new bov and block the larger hose.

Good on you mate just fit it and enjoy......

 

A VTA will have two downsides - one it can't open on a (high speed) cuise to dump boost pressure so you get worse fuel economy, secondly it has to be set quite tight so doesn't give best protection to your (less robust than an MHI TD series) IHI VF turbo, even with it wound tight you get rich running when its open due to it dumping airflow the MAF has measured for you...

Bin it, stick with the OE and either get an induction kit, or bin the resonator on the between wing pipes so you can here the stock valve a bit more....

Simon

 

Now THAT'S just the sort of educated, unbiased reply that all forums, all threads and all topics need!

 

LOL Make yer own comments!

 

 

All good

 

It was unbiased, but educated? Nope.

Subaru don't fit a VTA d/v, (and Prodrive don't in their mods, nor do ANY top tuners I know of), for a good reason.

It has nowt to do with the sound.

The Scoob ecu meters the air being sucked in by the engine, which is the same air as is being squeezed by the turbo.

Once the ecu has the measurement of the mass of air, it then meters the amount of FUEL the engine needs, and delivers it via the fuel injectors.

Should you lift off the throttle, the recirc valve puts that air back WITH IT'S METERED FUEL, and the air:fuel ratio remains spot on.

The VTA valve dumps the metered air OUT of the intake system, so that the air;fuel ratio is now VERY fuel rich.

This can lead to breakdown of your cat, burning of valves, fuel wash removing the lubrication in the upper cylinder and even the lower cylinder, fuel contamination of your oil...........can you see any GOOD yet?

Alcazar

 

Yes, It's xmas soon???

 

love the sound of mine, never heard of anyones car blowing up because of a dump valve. and there is a few of them on the road. i have had low idle and stalling when releasing throtle from boost in old car before. not sure if that was bov though

 

Cheers for the info. Is this WORST case scenario, or bet-your-life-on-it scenario?

My thoughts on it now, are that sure, I can fit it, and either like the sound or not. BUT...in the long run, its doing my engine no good to have it. I certainly dont like the idea of the scenario that Alcazar is stating as the outcome of fitting a BOV, but seems many people have fitted them without this happening, or at least, without any immediate serious problems.

I understand fully what you're saying. And im thinking I'll just not bother taking the chance. In the end, having an induction kit on already gives a fair 'wooosh' effect and to take a chance on fitting the BOV for an aesthetic 'I have a turbo' sound, I dont think anything is worth the probable danger I could be placing the rest of the components in.

Cheers all! 5 Stars all round.

 

I'm surprised you haven't been slaughtered for having an induction kit, they seem to be hated almost as much as VTA BOVs.

My opinion, I had a forge on my car, loved the sound, albeit limited because I had another fault that meant it was only running 0.5bar of boost, and the only problem I seemed to have was some hesitance when the car was stuck in traffic on a really hot day; queuing for an hour or more to get into Donnington with temps of about 25degrees. Once I got back out on the open road it was fine though.

 

Schhhhhhhh!!! I dont think anyone's picked up on that point yet!

 

induction kits are not hated; its their incorrect application that's mocked not the kit itself. The standard airbox assembly is not restrictive until around 350 iirc so its a pointless mod unless you are forced to use an induction kit because of fmic pipework or you are running over the 350 (if i've got that right), threshold. hth

 

Have one, makes noise, did not affect my fuel consumption or the car 2002 UK WRX. Been on the car now for 8 months.

The fueling etc on my car was not effected (based on the readings from the laptop before with the oem and after fitting a Forge VTA).

 

what were you using to capture the data and what 'readings' did you use to draw that conclusion?

 

It only affects the fuelling when the VTA is open, unlikley you will pick that up.....

With trails on induction kits, the correct kit applied correctly for he right reasons is OK, fitting a kit just cos everycar in M@x Pr@t magazine has one is not!

Running rich will NOT burn out valves - running lean does that.

Running that rich for short periods is also not likley to physically damage the cat, although it will age and reduce its effectiveness quicker, but it would have no effect come MOT time, but it may fail the cat monitor on an OBD car.

Simon

 

Good info there Simon.