Subaru Impreza Forum

Gaza · 02 Jun 2006, 11:53 AM

I'm new to turbo-chargers. I just bought my rex a couple of days ago and I want to upgrade a few things. I was thinking along the lines of an aftermarket BOV or an intake. A buddy of mine with an Evo told me to get a Vent to atmosphere BOV? Would any of you be kind enough to explain this to me or recommend some bolt-ons? Thanks.

jd · 02 Jun 2006, 11:59 AM

the standard blow off/dump valve on the impreza is a recirculation unit i.e. plumbed back into the turbo, a VTA doesnt get plumbed back & releases excess boost to atmosphere.

There are many opinions on this i.e bore wash etc.........it is all hearsay.

I have an APS twin vent dump valve which recirc below 0.6 bar then vta above that.

Be careful when choosing the dump valve as some are better than others, I have heard of Bailey units failing.

I am sure others will give you a better idea shortly.

Tidgy · 02 Jun 2006, 12:08 PM

got a bailey one on mine, due to it being on when i baught it, not had a problem yet (touch wood, pats head), gfb seem to be the best

Gaza · 02 Jun 2006, 12:18 PM

Thanks for the quick responses, guys. I was looking at either the APS Dual-vent or the HKS Sequential BOVs. Comments?

Tidgy · 02 Jun 2006, 12:24 PM

not sure to be honest mate, sorry i cant be of more help

jd · 02 Jun 2006, 12:49 PM

APS dual vent is a good unit, well made & sounds the dogs.

Just check the fitment to make sure it will be compatable.

Gaza · 02 Jun 2006, 02:59 PM

One more thing, will I have to get a retune if I put the new BOV on?

Tidgy · 02 Jun 2006, 03:19 PM

if you mean ecu map, some do, some don't depends on how well mated to the engine the one you get is

Gaza · 02 Jun 2006, 03:32 PM

So its a hit or miss kinda thing?

Tidgy · 02 Jun 2006, 03:48 PM

um, there is engineering to it as such, some cars don't seem to like having dumpvalves with out altering ecu settings. (bog standard evo's for exmple throw a fit if you put a dumpvalve on with out changing the ecu), not knowing anything about american scoobs i don't honestly know.

best bet find a specialist

Gaza · 02 Jun 2006, 05:19 PM

Gotcha. Thanks, mate. I just picked up a Turbo XS BOV and a APS turbo-back exhaust.

Tidgy · 02 Jun 2006, 08:01 PM

lol, that did't take you very long lol

Gaza · 03 Jun 2006, 04:47 AM

Haha. My idle is kinda funky now. The car will quit every once in a while. I guess I do need a tune.

bob · 03 Jun 2006, 01:43 PM

I had the HKS DTA on the Type R..I put it in the bin and refitted a Forge recirc. I now have a Forge VTA on the WR1 it is about to go in the bin and be replace with a recirc dump valve...

Gaza · 05 Jun 2006, 11:58 AM

How do you like the Forge? Thats what I had originally planned on getting but they were out of stock.

02 Jun 2006, 11:53 AM	#1 (permalink)
Gaza Dr. Infrastructure Join Date: Jun 2006 Location: Washington, D.C. Posts: 5,178	Vta Bov? I'm new to turbo-chargers. I just bought my rex a couple of days ago and I want to upgrade a few things. I was thinking along the lines of an aftermarket BOV or an intake. A buddy of mine with an Evo told me to get a Vent to atmosphere BOV? Would any of you be kind enough to explain this to me or recommend some bolt-ons? Thanks. __________________ Gary 2007 STi -Cobb AP; Turbo XS RFL; SPT Cat-back;18" Gram Lights
Offline

02 Jun 2006, 11:59 AM	#2 (permalink)
jd Obsessed Scooby Join Date: Mar 2005 Location: here Posts: 6,414	the standard blow off/dump valve on the impreza is a recirculation unit i.e. plumbed back into the turbo, a VTA doesnt get plumbed back & releases excess boost to atmosphere. There are many opinions on this i.e bore wash etc.........it is all hearsay. I have an APS twin vent dump valve which recirc below 0.6 bar then vta above that. Be careful when choosing the dump valve as some are better than others, I have heard of Bailey units failing. I am sure others will give you a better idea shortly. __________________ blah blah blah
Offline

02 Jun 2006, 12:08 PM	#3 (permalink)
Tidgy Super Moderator Join Date: Apr 2006 Location: Nottingham Posts: 18,743	got a bailey one on mine, due to it being on when i baught it, not had a problem yet (touch wood, pats head), gfb seem to be the best __________________ PM, Squirrels best friend, cream egg king and resident .org spam tart/Perv
Offline

02 Jun 2006, 12:18 PM	#4 (permalink)
Gaza Dr. Infrastructure Join Date: Jun 2006 Location: Washington, D.C. Posts: 5,178	Thanks for the quick responses, guys. I was looking at either the APS Dual-vent or the HKS Sequential BOVs. Comments? __________________ Gary 2007 STi -Cobb AP; Turbo XS RFL; SPT Cat-back;18" Gram Lights
Offline

02 Jun 2006, 12:24 PM	#5 (permalink)
Tidgy Super Moderator Join Date: Apr 2006 Location: Nottingham Posts: 18,743	not sure to be honest mate, sorry i cant be of more help __________________ PM, Squirrels best friend, cream egg king and resident .org spam tart/Perv
Offline

02 Jun 2006, 12:49 PM	#6 (permalink)
jd Obsessed Scooby Join Date: Mar 2005 Location: here Posts: 6,414	APS dual vent is a good unit, well made & sounds the dogs. Just check the fitment to make sure it will be compatable. __________________ blah blah blah
Offline

02 Jun 2006, 02:59 PM	#7 (permalink)
Gaza Dr. Infrastructure Join Date: Jun 2006 Location: Washington, D.C. Posts: 5,178	One more thing, will I have to get a retune if I put the new BOV on? __________________ Gary 2007 STi -Cobb AP; Turbo XS RFL; SPT Cat-back;18" Gram Lights
Offline

02 Jun 2006, 03:19 PM	#8 (permalink)
Tidgy Super Moderator Join Date: Apr 2006 Location: Nottingham Posts: 18,743	if you mean ecu map, some do, some don't depends on how well mated to the engine the one you get is __________________ PM, Squirrels best friend, cream egg king and resident .org spam tart/Perv
Offline

02 Jun 2006, 03:32 PM	#9 (permalink)
Gaza Dr. Infrastructure Join Date: Jun 2006 Location: Washington, D.C. Posts: 5,178	So its a hit or miss kinda thing? __________________ Gary 2007 STi -Cobb AP; Turbo XS RFL; SPT Cat-back;18" Gram Lights
Offline

02 Jun 2006, 03:48 PM	#10 (permalink)
Tidgy Super Moderator Join Date: Apr 2006 Location: Nottingham Posts: 18,743	um, there is engineering to it as such, some cars don't seem to like having dumpvalves with out altering ecu settings. (bog standard evo's for exmple throw a fit if you put a dumpvalve on with out changing the ecu), not knowing anything about american scoobs i don't honestly know. best bet find a specialist __________________ PM, Squirrels best friend, cream egg king and resident .org spam tart/Perv
Offline

02 Jun 2006, 05:19 PM	#11 (permalink)
Gaza Dr. Infrastructure Join Date: Jun 2006 Location: Washington, D.C. Posts: 5,178	Gotcha. Thanks, mate. I just picked up a Turbo XS BOV and a APS turbo-back exhaust. __________________ Gary 2007 STi -Cobb AP; Turbo XS RFL; SPT Cat-back;18" Gram Lights
Offline

02 Jun 2006, 08:01 PM	#12 (permalink)
Tidgy Super Moderator Join Date: Apr 2006 Location: Nottingham Posts: 18,743	lol, that did't take you very long lol __________________ PM, Squirrels best friend, cream egg king and resident .org spam tart/Perv
Offline

03 Jun 2006, 04:47 AM	#13 (permalink)
Gaza Dr. Infrastructure Join Date: Jun 2006 Location: Washington, D.C. Posts: 5,178	Haha. My idle is kinda funky now. The car will quit every once in a while. I guess I do need a tune. __________________ Gary 2007 STi -Cobb AP; Turbo XS RFL; SPT Cat-back;18" Gram Lights
Offline

03 Jun 2006, 01:43 PM	#14 (permalink)
bob Senior Scooby Join Date: Jul 2004 Location: Bristol UK Posts: 1,547	I had the HKS DTA on the Type R..I put it in the bin and refitted a Forge recirc. I now have a Forge VTA on the WR1 it is about to go in the bin and be replace with a recirc dump valve...
Offline

05 Jun 2006, 11:58 AM	#15 (permalink)
Gaza Dr. Infrastructure Join Date: Jun 2006 Location: Washington, D.C. Posts: 5,178	How do you like the Forge? Thats what I had originally planned on getting but they were out of stock. __________________ Gary 2007 STi -Cobb AP; Turbo XS RFL; SPT Cat-back;18" Gram Lights
Offline

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
what happens if a standard Recirculating BOV is not working	robdewell	Engine Bay	3	27 Apr 2006 04:36 PM
BOV	DellWRX	Engine Bay	3	21 Jun 2005 09:04 AM
I know (BOV)	skylight	Subaru Impreza Discussions	11	03 Aug 2004 11:06 AM

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode