ok lets see what we all have to say this time dump valve /bov is it a worthwhile mod does it do anything apart from turning heads. lets hear from the tech guys on this i recently got another scooby and it as a loud ish dump valve personally i like the swoosh and so do the kids but is it harming my car is it making my car perform better should i go back to standard,,,,, why do they all sell them if they are harmfull ...ok guys your knowledge and thoughts on this .....

 

i've got a hks ssqv bov on my bug, not had any problems so far and i'm running at 340 bhp

wiley

 

anyone else

 

The standard one works fine

 

api did a running test iirc and with a non standard dumpvalve (baileys iirc) the car ran worst and had less mpg good enough for me.

 

Not worth the hassle of changing from standard. Standard one works fine for most applications. If you want the woosh noise, then go VTA, but be advised that many who have done that then reverted to the std. recirculating type comment that the car runs significantly better with the latter.

Ns04

 

if you vent to atmosphere you're throwing away air that has already been metered and fueled for. hence you overfuel, possibly wash the bores and increase engine wear. your mpg would also be affected. this is a general statement and not specific to scoobs

owbow

 

Tried two differnt vta, car ran fine but felt less reposive.

On full boost car felt empty if u no what i mean, even the mrs noticed it was slower.

Gone back to standard.

But each to therre own. my mates got 1 on his bug with no issues. had it on since he bought it.

 

ive gone through 3 VTA's. standard recirc and blanked off completely

my experiance:

ive had baileys, HKS SSQV and last turbo smart adjustable.

favourite was the turbosmart because i have mine adjusted as hard as poss so only vta's on hard boost and lots of turbo stall chatter.

With it blanked off it feels exactly the same as when turbosmart was on only without the woosh. turbo chatter is no louder

put standard back on today and i do miss the noise on high boost as alot of the chatter has gone but imo the gear changes are 100% smoother

im staying with recirc as its a better drive but i'm sure i'll change it for meets etc for the noise

 

I bought mine on US Ebay Dual Stage BOV - WorxTuning Components

It can be set to full recirc, full VTA or anywhere in between, It makes a nice woooosh when giving it the beans.

+ I bet no-one on here has one, so pretty exclusive as well..

 

its up to u mate . if u search previous threads onhere u will see its pretty much 50/50 for and against for different reasons

 

NOT.

 

Vital safety aid, pedestrians are all deaf, they need to hear you coming !

Sorry !

dunx

P.S. Forge VTA with the stiffest spring available, so when it does, it really goes off ! No issues and 26 mpg from an STI

 

I've had a few VTA's on various imprezas that i've had over the years, sadly i'm a sucker for the vta noise!

I fitted a collins VTA to my last newage car and it buggered the in gear pick up so much that i removed it within a week and sold it on.

My latest JDM car (twin scroll STI) now has an APS twin dump valve. It does both, VTA and recirculates. Around town it recirulates and out on the open road it vents to atmosphere as the car can reach full boost. Its also adjustable so you can choose how much pressure it needs before VTA.

I was worried that it would bugger the in gear pick up of the car just like the last one but it still drives the same and feels perfect.

They are expensive though.

 

Got a Collns one fitted No issues at all still returning the same MPG but love the sound its really loud with the full induction kit well worth it IMHO

 

I run no DV at all.

 

I run no DV at all. Also have a 20G.

When I originally bought my old car it had a VTA. Load of crap and fast/hard gear changes were very choppy. Changed it back to a standard recirc and driveability was much improved.

 

No Daniel.

 

I dont run one either with a MD321T+ turbo

Graeme

 

cheers guys all your comments welcome as i now have a very clean looked after scooby and is mostly standard i think im takin dump valve off and going complety standard i have also noticed that the air box lower half as been drilled with about 30, 10 mm holes anyone know if this is harmfull and why it might have been done only just noticed it

 

You need to run a (standard recirc) dump valve unless your turbo can handle not having one at all (TD05-18g/20g, etc).

 

sorry yes i meant takin the baileys off and fitting a stanard one on must have been my wording

 

good idea, have known of the spring in Baileys dump valves to fail.

 

Drilling holes in the air box is an "old school" mod to improve airflow !

HTH

dunx

 

old skool! and yes to dump valve

 

his is a forge dumpvalve not a baileys but hes still binning it its started to idle strange so hoping by taking the dv off it will sort itself out.

 

ive now got an old type hks sequential bov, sounds really nice, and is a proper item, the older ones were the best apparantely and i was lucky to get it.

the bailey dv36 was loud aswell and the response on gearchange was immense.

Had a standard one too, ran the smoothest, no pops or bangs, slightly better on fuel aswell.

i think ill keep the hks seq bov as they seem to have a good rep.

even when driving normally the chatter from everything combined is

 

Unless you've been watching the fast and furious is there a reason to have a VTA? Most scoobies make enough noise if thats the thing that floats your boat

 

i think you should keep it i love the noise when it dumps

 

I'm running the APS Dual port on my 2002 Bug, I found it improved gear shifts it recirculates when under low to moderate boost, mine only VTAs on full boost, with a nice sound. Nice but expensive!