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Old 09-18-2013, 11:59 PM   #76
BigRob74
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Join Date: Dec 2011
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how often and how to you need to grease this thing?
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Old 09-19-2013, 01:36 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, 02:54 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, 03:04 AM   #79
Rowrx11
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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, 03:20 AM   #80
Phatron
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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, 11:47 AM   #81
D-Rodman
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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, 09:11 PM   #82
Rowrx11
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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, 04:51 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, 10:48 PM   #84
424wrx
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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, 01:26 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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