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Old 09-05-2009, 01:00 AM   #1
riley
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Default HKS Blow off valve

Got an 09 WRX and i just installed the hks blow off valve is the backfire something that can damage the car?
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Old 09-05-2009, 01:01 AM   #2
sedagive
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All I know is that intakes and blow off valves are NOT good for Subarus.
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Old 09-05-2009, 01:09 AM   #3
riley
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Quote:
Originally Posted by STi-Thrill View Post
All I know is that intakes and blow off valves are NOT good for Subarus.
man i got both u know the reason why there bad for the wrx?
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Old 09-05-2009, 01:13 AM   #4
sedagive
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Quote:
Originally Posted by riley View Post
man i got both u know the reason why there bad for the wrx?

Just found this on a google search, it should hopefully clear some stuff up.

Quote:
|_____1.22 - INSTALLING AN INTAKE PREMATURELY

I fully understand the reasoning behind this mod in some WRX owner’s eyes. In most other cars a good Intake is worth 5 to 10 hp, however not so in the WRX. It does change the turbo spool sound to add a quite nice scream at full boost, however can potentially damage your engine, not to mention little to no power gain. The stock intake (minus the resonator, See Exhaust for diagram) is capable of 325 hp. Intakes simply lean your car out (More Air Less Fuel) to gain power and can seriously hurt your engine and turbo if installed before engine management and injector upgrades.


Here is some info on BOV's --


Quote:
100% atmospheric release blow off valves cause your engine to run rich for the split second you let off the throttle and the BOV is releasing pressure. It runs rich because the engine is expecting the blow off air to be returned through the turbo inlet hose and into the air intake.

This rich condition causes "AfterFire" and in exhaust systems with no catalytic converters a flame can be seen to come out of the exhaust pipes anywhere from 2" to 2 feet depending on temperature of the exhaust pipes and how rich your car gets.

A blow off valve installed on a car with modified exhaust and intake is OK. To be completely safe, you'll need an ECU tune. I have mine tuned by Tampa's best street tuner, 3gsucks. Otherwise, a blow off valve installed on a stock wrx is BAD. The afterfire will have nowhere to go due the catalytic converters and will expand in your turbo rather than out your pipe to produce the ever wanted "pop" from horizontally opposed turbo engines.

This benefits off road users because it allows the turbo to stay spinning longer by releasing the pressure out of the system rather than back into it. This cut's down on boost time and turbo lag. Combine this with a turbo inlet, MAF hose, K&N, UP pipe and Down Pipe, Intercooler hoses, you will see a dramatic reduction in spool time. The stock TD04 has the best spool time out of most turbo's because its small enough to spin fast, but big enough to spin huge volumes of air. 360 CFM to be exact.
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Old 09-05-2009, 01:19 AM   #5
riley
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I Do have COBB downpipe, COBB Sway bars, SPT Exhaust K&N Short Ram and HKS Blow Off valve so u recommend i put the stock intake and bov back on? I Also have the access port and the stage 2 map.
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Old 09-05-2009, 01:36 AM   #6
QwikEVO
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did you recirculate your HKS?

if it's backfiring, I'm assuming not.
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Old 09-05-2009, 01:40 AM   #7
sedagive
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Quote:
Originally Posted by riley View Post
I Do have COBB downpipe, COBB Sway bars, SPT Exhaust K&N Short Ram and HKS Blow Off valve so u recommend i put the stock intake and bov back on? I Also have the access port and the stage 2 map.

I would. You should really have a tuner make recommendations for you based on what your tune is.
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Old 09-05-2009, 01:42 AM   #8
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You can get your car protuned for those mods and it'll be fine. It will only cause problems if it goes un-tuned.
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Old 09-05-2009, 01:43 AM   #9
riley
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alright i'll put the stock intake and BOV back on thank you no it's not recirculated
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Old 09-05-2009, 01:53 AM   #10
riley
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who up here can tune ?
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Old 09-05-2009, 02:01 AM   #11
QwikEVO
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i'd hit up TurboSetch.

I can change up your tune, but I don't have a datalogger that works with Subies.
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Old 09-05-2009, 02:03 AM   #12
riley
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Those parts w/o a tune wont jack up the car will they?
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Old 09-05-2009, 02:10 AM   #13
QwikEVO
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a VTA BOV will jack up your tune.

So will a CAI.
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Old 09-05-2009, 02:24 AM   #14
riley
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Quote:
Originally Posted by QwikEVO View Post
a VTA BOV will jack up your tune.

So will a CAI.
Im dumb with cars, i got the SSQV HKS atmospheric only one for an 08+ wrx
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Old 09-05-2009, 03:00 AM   #15
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The BOV won't jack up your car.... all it really do will make you rich...

But I would worry about the intake without a tune now that will make you lean and lean is bad!
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Old 09-05-2009, 03:01 AM   #16
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Oh yeah.... search noob!
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Old 09-05-2009, 03:25 AM   #17
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Quote:
Originally Posted by Kiwi Fella View Post
Oh yeah.... search noob!
Reported.

Be nice to the noob.







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Old 09-05-2009, 04:39 AM   #18
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christ......... if tuned correctly neither will do anything to hurt the car. especially if you go to speed density, for the BOV
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Old 09-05-2009, 12:38 PM   #19
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Quote:
Originally Posted by zachary.berrier View Post
christ......... if tuned correctly neither will do anything to hurt the car. especially if you go to speed density, for the BOV
Haha, I was waiting for you to chime in... Don't be a stranger Zack

The question I have is other then the noise what are you trying to accomplish... There are plenty of other mods for the money that would actually be a benefit.
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Old 09-05-2009, 01:10 PM   #20
Marlons101
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Like running water injection for 300$ more
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Old 09-05-2009, 04:18 PM   #21
JCharron2005
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If he is running the Cobb map with a cobb intake than hes fine. The intake wont hurt. I have a pretty close set-up. minus the BOV, id take the stock BPV over an hks anyday, unless it recircs.
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Old 09-07-2009, 01:33 PM   #22
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Quote:
Originally Posted by zachary.berrier View Post
christ......... if tuned correctly neither will do anything to hurt the car. especially if you go to speed density, for the BOV
word zach. ran my bugeye forever w greddy type s untuned. = nada. one of those nasioc don't do it things! omg! evil, evil bov that will destroy your engine bs. just don't run a 9lb flywheel w a light crank pulley. that equals misfires.
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Old 09-07-2009, 03:58 PM   #23
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The BOV doesn't just open between shifts. Any time the engine is running vacuum, like before the turbo spools, the valve is open. This is to circumvent the restriction of the turbo in the intake tract. If you run an atmospheric BOV, then you are sucking in unmetered, unfiltered air anytime you are not running under boost... This WILL damage any engine, not just a subaru. It may take time, and it depends on air quality, moisture, how you drive. But this is what happens, you cannot deny it. Not to refute you zach or benny, you have real experience, but this is real data.
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Old 09-08-2009, 01:59 PM   #24
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See this explanation I wrote...I will help you if you want.

http://forums.nasioc.com/forums/show...=bov+explained
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Old 09-08-2009, 10:01 PM   #25
Billboard2001
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riley-
I was running pretty much the EXACT same setup as you. I had the afterfiring events that you describe (not backfire). I tried switching to a different vent to atmosp. blowoff valve and had the same problems. The only way I got it to run better was to put it back into recirulation. After I did that there were no more afterfire pops, and the engine no longer bogged down well under 1k after lifting off the gas. My suggestion is to get an after market recirc. valve if you want to upgrade it. I used greddy's type rs and it works wonderfully. No more bogging/popping. You can still even hear the valve working too, louder then stock (if the sound is what your going for which I assume is correct cause u got an hks ss :-)
hope this helps
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