Blow off valve - Subaru WRX Forum
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#1 Old 04-12-2012, 12:45 AM
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Blow off valve

Just got a 2012 hatch sti and I'm buying some new things for my toy. One thing on my list is a bov. What are some good ones that I can rely on?
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#2 Old 04-12-2012, 01:29 AM
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hks bov's are ok and the blitz are nice. if you get one make sure to get a tune or youll be running lean or worse
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#3 Old 04-12-2012, 03:22 AM
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http://www.wrxtuners.com/forums/f51/bovs-newbs-32071/

GrrrRRRrrrrr...lol

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Last edited by BLAZE2099; 04-12-2012 at 03:24 AM. Reason: grrrrr..lol
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#4 Old 04-12-2012, 06:33 AM
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hks bov's are ok and the blitz are nice. if you get one make sure to get a tune or youll be running lean or worse
Please explain.
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#5 Old 04-12-2012, 07:30 AM
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^That's just evil

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#6 Old 04-12-2012, 05:47 PM
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Two mods that can't be tuned for 100%.

1) A BOV
2) A Manual Boost Controller aka MBC

Its just impossible to tune for every scenario and these two mods normally hurt more than they help. Think about it...you're randomly messing with the amount of air in your air/fuel mix with the BOV.

Any MBC will be over riding the ECU's control of your boost. Which the ECU can crunch numbers and make adjustments faster than you can blink...meanwhile the MBC will always arbitrarily skew the correct boost per the rpm range. Meaning both of these mods are harmful to the correct air/fuel mixture that your engine receives. Its not worth it for a noise factor and "oh I can boost like a MOFO at low rpms"; but normally the MBC will have worse top end performance then ECU controlled boost. Just don't...even at your best bet. A good 50/50 BOV is hard to find unless you know which brands to choose from and you're only half fixing the problem.

Sorry, if I'm covering two bases at once. I know the OP only asked about Blow off valves.

Kirt
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"When in doubt...flat out" - Colin McRae
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#7 Old 04-12-2012, 05:59 PM
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I've been waiting a while to use this!

Save your money to buy something else. Hopefully not a CAI.

Cobb Accessport Stage 2.
JDM ej205 swap.

Hakuna Matata.

Chuck.
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#8 Old 04-12-2012, 06:17 PM
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or a tbe, although with an intake, you will hear your bpv a bit better.

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#9 Old 04-12-2012, 06:35 PM
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Randy you mean do buy a TBE...it could get confused. The last thing Chuck mentioned was don't buy a CAI.

Kirt
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#10 Old 04-12-2012, 06:49 PM
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EDIT: OK, get a TBE or a CAI.
Than. Get a tune....Or the other way around, than another tune

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#11 Old 04-12-2012, 07:21 PM
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CAI's are ok.... Just not in areas that see lots of water, snow, puddles driving like a bootyhole. Some actually help your car regardless of throttle response or as some ppl say "lag".

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#12 Old 04-12-2012, 07:21 PM
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ok im lost on like everyones posts so here it is...

a CAI is a great buy! a short ram is a horrible buy! the CAI's for these cars make nice power and as long as you dont spend money on a name drop intake they are affordable too. a short ram will destroy power! the engine bay is way to hot. even with me having a CAI that does not have a heat shield i lose 15HP and TQ when the ambient temps go up about 10-15 degrees. needless to say from winter to summer i lose an ass load of power. now think about how much more you'll lose with the filter sitting on top of a hot engine bay. these cars are fully controlled by the MAF sensor and keeping that thing as cold as possible is a must. also if you start sucking in hot air you will be putting the engine more at risk for knocking. if you get a tune with i short ram your tuning will have to keep timing down to prevent knock, now you've lost even more power. also these cars have very good fender plastic protection wheel things (brain fart). ive drivin through massive puddles and the filter stays dry all the time. do not be scared about water and a CAI.

to sum that up get a CAI with a shield.

as for a TBE, great buy! as long as you use it with a stage tune 2.

as said on the BOV, dont do it! as for an aftermarket BPV, dont do it!! your stock metal BPV can handle plenty of boost! its not plastic like the crappy WRX ones.

Scott-2011 WRX 335HP 394TQ 93 VF52!
http://www.wrxtuners.com/forums/f121/2011-wrx-build-31226/
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#13 Old 04-13-2012, 01:29 AM
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Quote:
Originally Posted by brfatal View Post
Please explain.
point is a bov will make the car run like crap
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#14 Old 04-13-2012, 07:17 AM
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point is a bov will make the car run like crap
Read post #3 in Blaze's link.
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#15 Old 04-13-2012, 07:48 PM
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^
A properly working valve will have no ill consequences except the minor rich bump and loss of spool between shifts. That being said, BoVs are still a bad idea for most people because they require maintenance and setup, neither of which seem to ever be done correctly or at all. The reason cars run like crap and stall is due to leaking caused by that or because of poo design (in your case both the TXS H-line and the HKS SSQV V1 are both well known for leaking). The stock piece is ideal because it requires nothing at all from the user's end, it doesn't vent to atmosphere, and it's free.


jumped over and grabbed it

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2004 Wrx-sold
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