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Old 11-23-2012, 07:16 PM   #1
my06wrx
Scooby Newbie
 
Member#: 336376
Join Date: Oct 2012
Chapter/Region: MAIC
Location: Richmond Va
Vehicle:
2006 WRX CGM
TP Tuned @18psi

Default 06 Wrx Bov Question

at what point in building up a stock 06 WRX does it become mechanically necessary to install a BOV? I've heard its bad to install one on a stock 06.
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Old 11-23-2012, 07:19 PM   #2
HinshawWRX
Medium Frank
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Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
Vehicle:
2014 Porsche
GT3 (Currently on Fire)

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Only once your stock BPV starts to fail would you want to consider upgrading. Even so, the stock BPV is extremely good. Read UNABOMBERS MANIFESTO for more information about a BOV and BPV and the differences in them.
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Old 11-23-2012, 07:34 PM   #3
10MTN-bugeye
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Join Date: Jul 2011
Vehicle:
2002 Bugeye
PSM and parking lot scars

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It really depends whether you're running MAF or SD. I don't know that it's ever necessary to have a vent to atmosphere rather than a recirculating valve.

VTA blow off valves are criticized, because they allow air that's already been "counted" by the MAF sensor and ECU, to leave the system. So the computer's instructions to the injectors, based on an amount of air that has been released from the system. This leads to rich AFRs during shifting. Rich is better than lean, but still not ideal.

For an ecu using a speed density tune, I don't believe there is any downside. From what I remember, SD uses manifold pressure, engine speed and VE to calculate the the amount of air rather than relying on the MAF sensor.

What point are you at in your build up? I would recommend the common upgrade path (1) engine management, (2)exhaust, (3) intake, (4) then think about upgrading injectors, intercooler, turbo.
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Old 11-23-2012, 08:04 PM   #4
rudymcskoody
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Join Date: Sep 2010
Chapter/Region: TXIC
Location: lewisville, tx
Vehicle:
2006 wrx
aspen white

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There is no need for a bov. The stock should hold up to 22-24psi. After that you might want to think about a aftermarket bpv.
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Old 11-25-2012, 08:13 AM   #5
my06wrx
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Member#: 336376
Join Date: Oct 2012
Chapter/Region: MAIC
Location: Richmond Va
Vehicle:
2006 WRX CGM
TP Tuned @18psi

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Have a AP, and Im picking up a invida split mouth dp, and a borla hush catback today. i think thats about as far as im going mechanically. Will probably get a protune at some point. Everyone keeps telling me that the stock intake with a good filter is more than enough, given this is my everyday driver. Next stop will probably be some tighter spring, my car is at 60k, and the suspension feels kinda soft, probably just from everyday use.

Last edited by my06wrx; 11-25-2012 at 08:40 AM.
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