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Old 09-18-2013, 10:59 PM   #76
BigRob74
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how often and how to you need to grease this thing?
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Old 09-19-2013, 12:36 AM   #77
Rowrx11
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Quote:
Originally Posted by SVT_WRX View Post

Yellow spring, no shims. Enjoy!

Damn, I haven't been on here for a while. Lol.
No shims ? Ok.. thanks for the fast reply.

Regards.
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Old 09-19-2013, 01:54 AM   #78
Phatron
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The spring and shim combos are not an exact science. Just keep increasing the spring size and adding shims until u get compressor surge at throttle lift, then take a shim back out.
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Old 09-19-2013, 02:04 AM   #79
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Quote:
Originally Posted by Phatron View Post
The spring and shim combos are not an exact science. Just keep increasing the spring size and adding shims until u get compressor surge at throttle lift, then take a shim back out.
Yellow spring is for 15 - 23 psi right? I should not have leakage problems with 19 to 20 psi...and Sorry for this noob question.... what is compressor surge ? How to know if I have this problem?
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Old 09-19-2013, 02:20 AM   #80
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Like I said, it's not an exact science. Some cars necessitate a higher spring and many more shims than others.

Go to you tube and listen to a video of compressor surge. It's kind of like a choppy bov sound. Instead of a smooth release of air like a bov (pshhhhhhhh), the air is trying to go backwards through the compressor and goes psh psh psh psh psh psh psh. You will know it if it happens, it's a distinct sound. It's caused when the bov/bpv spring is too tight and the valve doesn't open so the air has no where to go except backwards thru the compressor.
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Old 10-11-2013, 10:47 AM   #81
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I have a 2002 wrx wagon with a Jdm ver 8 motor swap. Basic stage 2 bolt on setup, tuned at 19psi on the stock vf37 turbo. With the stock wastegate actuator, a 3 port electronic boost controller and stock bpv there was a problem. I didn't know if the problem was the wastegate actuator not holding completely closed or if the bpv was bleeding. I decided to start troubleshooting the problem by replacing the stock bpv with a Forge bpv. Problem solved, running the blue spring with no shims. What a difference this simple change made, now I step on the gas pedal and the power delivery is linear and consistent. Throttle response is awesome, problem fixed.
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Old 10-30-2013, 08:11 PM   #82
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Today I install the forge bpv ! With the yellow spring without shims. The sound with my aem intake is a little " higher ". Very similar. I have no problems with compressor surge(shushshshsushhshs ) .. everything normal. But tomorrow I will put one shims on my yellow spring. ( my target boost is 19-21 psi max ) .

the quality is impressive !! Perfect fitment.
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Old 10-31-2013, 03:51 PM   #83
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Awesome! these things have been going strong with us for about 8 years now, i'm glad to see they get the recognition they deserve!
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Old 10-31-2013, 09:48 PM   #84
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Quote:
Originally Posted by Rowrx11 View Post
Today I install the forge bpv ! With the yellow spring without shims. The sound with my aem intake is a little " higher ". Very similar. I have no problems with compressor surge(shushshshsushhshs ) .. everything normal. But tomorrow I will put one shims on my yellow spring. ( my target boost is 19-21 psi max ) .

the quality is impressive !! Perfect fitment.
the yellow with no shims is what i run. i max at 21-22 psi and it releases pressure quicker than the stock valve.
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Old 11-01-2013, 12:26 AM   #85
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Quote:
Originally Posted by 424wrx View Post
the yellow with no shims is what i run. i max at 21-22 psi and it releases pressure quicker than the stock valve.
Exactly .. I prefer the yellow spring with no shims ... the cars feels great !!
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Old 11-17-2015, 11:58 PM   #86
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http://pure-tuning.com/blog/?p=200

Pure Tuning shows a Forge BPV making faster spool / greater area under the curve on a stock 06 sti. This seems like a total win but I haven't seen any reviews to support it.

They claim the forge closes faster than stock. "...the increase in boost pressure below 3800rpm netted 10whp at 3270rpm and 17ft/lbs at 3300rpm."

17ft/lbs is a very noticeable improvement and one that I would happily pay $1xx for because low end torque is king. Has anyone noticed faster spool/more torque? Also is there an alternative that's easier to adjust? I switch between 3 different boost pressures 12,18, and 21 psi.

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Old 11-24-2015, 07:35 PM   #87
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I had a forge BOV on my 04 STi after my blitz (came with car) crapped out. Ran it with the yellow spring and no shim and it was great.

They make great products and even my tuner recommended this brand to me.
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Old 11-24-2015, 10:58 PM   #88
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Did you notice an increase in torque?
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Old 01-09-2016, 08:29 AM   #89
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hmm not sure on noticing any power increases by the old butt dyno, but they've made a great valve that has been proven for over 10 years.
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