**BLOW OFF VALVES FOR THE STi**

STiVTEC · 08-17-2004, 12:33 PM

Okay, I need some assistance from some fellow STi Owners/Tuners. I just purchased my 05' model on Sunday, and I am on a mission to purchase the best sounding blow off valve without compromising performance on my STi. Can someone/anyone help me out and give me a couple suggestions? The HKS SSGV model is at the top of my list as of right now...is that a bad choice? Thanks for your help guys! I appreciate it.

* Registered users of the site do not see these ads.

rich728 · 08-17-2004, 12:36 PM

SEARCH

keep it stock

MattSTi · 08-17-2004, 12:41 PM

Any blow off valve is a bad choice. Whenever you vent intake air to atmosphere in a MAF car, the engine thinks the vented air is still there, and adds fuel accordingly. This will make your car run rich. Trust me, I ignored everyone's advice when I first got my 04 STi and got a Turboxs Type-H. To make a long story short I had the BOV installed for a total of four hours before removing it. Don't get me wrong, Turboxs is an awesome company, but a blow off valve just isn't necessary on a car running anywhere near stock boost levels. Do the intake silencer mod (free) or get a short ram intake, you will be able to hear the stock BPV, and the turbo spool, very clearly, either way you will save yourself money.

vf39hipsi · 08-17-2004, 12:45 PM

I agree I dumped my RFL for an injen cold air and you get spool and BOV style sounds, BOV's unfortunately are nothing but problems

DISCOPOPE · 08-17-2004, 12:54 PM

#1 get a WORX
#2 there are about 50 threads on bov's for the sti. search please.
#3 all caps in the thread title... it's annoying.
#4 enjoy the car.. and welcome to the 2.5 forum..

STiVTEC · 08-17-2004, 12:55 PM

Hmmmm, my buddy has a 2005 STi model too that he purchased on Friday and he put on his Sheep BOV w/o any problems. But as far as being a Sooby Newbie...I think I'll take your guys' advice and pick up an intake instead...or should I just pull out my intake silencer??? What's more beneficial?

Tobey · 08-17-2004, 12:56 PM

i did a worx bov set to full recirculate (so technically it's not a blow off valve) with a perrin short ram and it's a nice sound without being stupid loud, it also will not harm your driveability.

DISCOPOPE · 08-17-2004, 01:01 PM

Quote:

Originally Posted by STiVTEC

Hmmmm, my buddy has a 2005 STi model too that he purchased on Friday and he put on his Sheep BOV w/o any problems. But as far as being a Sooby Newbie...I think I'll take your guys' advice and pick up an intake instead...or should I just pull out my intake silencer??? What's more beneficial?

best power mods start with a tbe.
i vote save cash for a tbe/intake/engine managment/good dyno tune.

oh, and a set of winter tires/rims.

STiVTEC · 08-17-2004, 01:20 PM

Sorry, haha, but what's a TBE?

909STi · 08-17-2004, 01:30 PM

I have an 05 STi with the Worx BOV and I have driven it for about 1000 mile with the Worx BOV on and set at 75% recirculating and 25% blow-off to the atmosphere. I found that setting it at 50% and 50% causes backfiring issues between shifts due to the rich condition it creates.

I am getting tired of all the people who say: "BOV's are stupid, stay with the stock one." Everyone knows they aren't really a performance mod and that they are just for fun, which is the main reason we like to modify our cars. So if you like the sound, then get one. The Worx one is really good, can be used on 100% recirculating, and doesn't blow-off too soon like the stock one does. For example, when you barely get off the throttle while cruising at normal speeds, the stock one goes off, and you lose all your boost pressure. On the Worx, however, is less sensitive to minor pressure drops and so it does not do that. If anyone can argue against the benefits of that or that it doesn't make any difference, please enlighten me, as I am not an expert. I got that info from the guys at Suby Specialties in the LA area, and they seem pretty knowledgeable.

Welcome to the Subaru community. I have a catless TBE (TurboXS DP,MP, Perrin Catback) and that has been the best mod I have done so far. I would recommend that instead of an intake as a first mod. The reasons for that can be found in this article from Cobb Tuning: http://www.cobbtuning.com/tech/airflow/index.html

STiVTEC · 08-17-2004, 01:47 PM

This is very interesting. I am new and proud owner of an STi...I just want to hook up my ride the right way with no cheeziness involved. You guys are helpin' me out a great deal. I am also an owner of 1991 Civic Hatchback Si with a b18c 1.8 liter DOHC VTEC (road race setup) all motor that can definitely hang on a road course w/ an STi, but falls in a totally different league. I've owned a Honda all my life, and would like to be enlightened w/ more great Sooby knowledge. Thanks again guys...

rich728 · 08-17-2004, 01:57 PM

Quote:

Originally Posted by STiVTEC

This is very interesting. I am new and proud owner of an STi...I just want to hook up my ride the right way with no cheeziness involved. You guys are helpin' me out a great deal. I am also an owner of 1991 Civic Hatchback Si with a b18c 1.8 liter DOHC VTEC (road race setup) all motor that can definitely hang on a road course w/ an STi, but falls in a totally different league. I've owned a Honda all my life, and would like to be enlightened w/ more great Sooby knowledge. Thanks again guys...

Put a pot of joe on the burner and READ your ass off...these forums will enlighten your brain and enlighten your bank account

DISCOPOPE · 08-17-2004, 02:37 PM

TBE = turbo back exhaust.
keep a cat and you will not get boost creep.

there are 5 (?) spring settings on the worx in addition to the vent ration adjustment.
very adaptable if you plan on running more boost later in the life of your car.

8Complex · 08-17-2004, 02:47 PM

Titles with all caps and characters for attention-getting only are not allowed on this forum.

There is plenty of information on this forum, you can obviously read since you made it here already, don't get lazy and skip reading your way to a solution.

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
riverside ca Gfb Blow Off Valve For The Wrx & Sti	Von Pierre	Engine/Power/Exhaust	3	10-11-2007 01:23 PM
WTT: Greddy Type-S Blow Off Valve for Perrin Blow Off Valve	02GAWRX	Private 'Wanted' Classifieds	0	06-02-2006 10:59 PM
APS blow off valve for sale! Or swap for 04 stock WRX blow off valve.	SonomaCaliREX	Private 'For Sale' Classifieds	1	05-01-2006 04:15 AM
Universal Blitz Blow off Valve for the 2002 WRX	andivic	Factory 2.0L Turbo Powertrain	3	06-15-2001 10:47 PM
Blow off valves for the new WRX	JohnWad	Factory 2.0L Turbo Powertrain	14	04-25-2001 10:29 PM

08-17-2004, 12:33 PM	#1
STiVTEC Scooby Newbie Member#: 68357 Join Date: Aug 2004 Vehicle: 2005 Sooby STi Black Honda EF9 DOHC VTEC White	BLOW OFF VALVES FOR THE STi Okay, I need some assistance from some fellow STi Owners/Tuners. I just purchased my 05' model on Sunday, and I am on a mission to purchase the best sounding blow off valve without compromising performance on my STi. Can someone/anyone help me out and give me a couple suggestions? The HKS SSGV model is at the top of my list as of right now...is that a bad choice? Thanks for your help guys! I appreciate it. * Registered users of the site do not see these ads.

08-17-2004, 12:36 PM	#2
rich728 Scooby Specialist Member#: 40328 Join Date: Jul 2003 Chapter/Region: South East Location: MiamiFL Pastelito Racing/SFSOC Vehicle: 2004 WRX STi BSP #728	SEARCH keep it stock

08-17-2004, 12:41 PM	#3
MattSTi Scooby Specialist Member#: 54885 Join Date: Feb 2004 Chapter/Region: MAIC Location: WV/DC, Philly, NYC Vehicle: 2004 PSM STi 91 Spec Miata	Any blow off valve is a bad choice. Whenever you vent intake air to atmosphere in a MAF car, the engine thinks the vented air is still there, and adds fuel accordingly. This will make your car run rich. Trust me, I ignored everyone's advice when I first got my 04 STi and got a Turboxs Type-H. To make a long story short I had the BOV installed for a total of four hours before removing it. Don't get me wrong, Turboxs is an awesome company, but a blow off valve just isn't necessary on a car running anywhere near stock boost levels. Do the intake silencer mod (free) or get a short ram intake, you will be able to hear the stock BPV, and the turbo spool, very clearly, either way you will save yourself money.

08-17-2004, 12:45 PM	#4
vf39hipsi Scooby Specialist Member#: 55794 Join Date: Feb 2004 Location: NY	I agree I dumped my RFL for an injen cold air and you get spool and BOV style sounds, BOV's unfortunately are nothing but problems

08-17-2004, 12:54 PM	#5
DISCOPOPE Scooby Specialist Member#: 43339 Join Date: Sep 2003 Location: mpls, mn Vehicle: 2oo4 STi URgt35r w/t3hM3finj3cki0n	#1 get a WORX #2 there are about 50 threads on bov's for the sti. search please. #3 all caps in the thread title... it's annoying. #4 enjoy the car.. and welcome to the 2.5 forum..

08-17-2004, 12:55 PM	#6
STiVTEC Scooby Newbie Member#: 68357 Join Date: Aug 2004 Vehicle: 2005 Sooby STi Black Honda EF9 DOHC VTEC White	Hmmmm, my buddy has a 2005 STi model too that he purchased on Friday and he put on his Sheep BOV w/o any problems. But as far as being a Sooby Newbie...I think I'll take your guys' advice and pick up an intake instead...or should I just pull out my intake silencer??? What's more beneficial?

08-17-2004, 12:56 PM	#7
Tobey Scooby Specialist Member#: 21400 Join Date: Jul 2002 Chapter/Region: NESIC Location: Seacoast, NH Vehicle: 2008 Leg Limited GT Pearl White	i did a worx bov set to full recirculate (so technically it's not a blow off valve) with a perrin short ram and it's a nice sound without being stupid loud, it also will not harm your driveability.

08-17-2004, 01:20 PM	#9
STiVTEC Scooby Newbie Member#: 68357 Join Date: Aug 2004 Vehicle: 2005 Sooby STi Black Honda EF9 DOHC VTEC White	Sorry, haha, but what's a TBE?

08-17-2004, 01:30 PM	#10
909STi Scooby Newbie Member#: 62490 Join Date: May 2004 Chapter/Region: SCIC Location: Dana Point Vehicle: 2005 WRX STi FP Green'd & Yimi Tuned	I have an 05 STi with the Worx BOV and I have driven it for about 1000 mile with the Worx BOV on and set at 75% recirculating and 25% blow-off to the atmosphere. I found that setting it at 50% and 50% causes backfiring issues between shifts due to the rich condition it creates. I am getting tired of all the people who say: "BOV's are stupid, stay with the stock one." Everyone knows they aren't really a performance mod and that they are just for fun, which is the main reason we like to modify our cars. So if you like the sound, then get one. The Worx one is really good, can be used on 100% recirculating, and doesn't blow-off too soon like the stock one does. For example, when you barely get off the throttle while cruising at normal speeds, the stock one goes off, and you lose all your boost pressure. On the Worx, however, is less sensitive to minor pressure drops and so it does not do that. If anyone can argue against the benefits of that or that it doesn't make any difference, please enlighten me, as I am not an expert. I got that info from the guys at Suby Specialties in the LA area, and they seem pretty knowledgeable. Welcome to the Subaru community. I have a catless TBE (TurboXS DP,MP, Perrin Catback) and that has been the best mod I have done so far. I would recommend that instead of an intake as a first mod. The reasons for that can be found in this article from Cobb Tuning: http://www.cobbtuning.com/tech/airflow/index.html

08-17-2004, 01:47 PM	#11
STiVTEC Scooby Newbie Member#: 68357 Join Date: Aug 2004 Vehicle: 2005 Sooby STi Black Honda EF9 DOHC VTEC White	This is very interesting. I am new and proud owner of an STi...I just want to hook up my ride the right way with no cheeziness involved. You guys are helpin' me out a great deal. I am also an owner of 1991 Civic Hatchback Si with a b18c 1.8 liter DOHC VTEC (road race setup) all motor that can definitely hang on a road course w/ an STi, but falls in a totally different league. I've owned a Honda all my life, and would like to be enlightened w/ more great Sooby knowledge. Thanks again guys...

08-17-2004, 02:37 PM	#13
DISCOPOPE Scooby Specialist Member#: 43339 Join Date: Sep 2003 Location: mpls, mn Vehicle: 2oo4 STi URgt35r w/t3hM3finj3cki0n	TBE = turbo back exhaust. keep a cat and you will not get boost creep. there are 5 (?) spring settings on the worx in addition to the vent ration adjustment. very adaptable if you plan on running more boost later in the life of your car.

08-17-2004, 02:47 PM	#14
8Complex Moderator Member#: 922 Join Date: Feb 2000 Chapter/Region: MWSOC Location: Schaumburg, IL Vehicle: 04 FXT Red	Titles with all caps and characters for attention-getting only are not allowed on this forum. There is plenty of information on this forum, you can obviously read since you made it here already, don't get lazy and skip reading your way to a solution.