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Old 08-17-2004, 12:33 PM   #1
STiVTEC
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Honda EF9 DOHC VTEC White

Default **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.
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Old 08-17-2004, 12:36 PM   #2
rich728
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keep it stock
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Old 08-17-2004, 12:41 PM   #3
MattSTi
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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.
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Old 08-17-2004, 12:45 PM   #4
vf39hipsi
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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
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Old 08-17-2004, 12:54 PM   #5
DISCOPOPE
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#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..
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Old 08-17-2004, 12:55 PM   #6
STiVTEC
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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?
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Old 08-17-2004, 12:56 PM   #7
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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.
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Old 08-17-2004, 01:01 PM   #8
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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.
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Old 08-17-2004, 01:20 PM   #9
STiVTEC
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Sorry, haha, but what's a TBE?
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Old 08-17-2004, 01:30 PM   #10
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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
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Old 08-17-2004, 01:47 PM   #11
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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...
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Old 08-17-2004, 01:57 PM   #12
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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
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Old 08-17-2004, 02:37 PM   #13
DISCOPOPE
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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.
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Old 08-17-2004, 02:47 PM   #14
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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.
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