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Old 05-31-2008, 10:59 PM   #1
Homer
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Default Porsche/Audi Diverter Valve

Installed a few weeks ago, I finally took some pics. Shifts are amazing, idle is so solid. I don't miss my BOV.


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Old 05-31-2008, 11:07 PM   #2
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I want one...
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Old 05-31-2008, 11:10 PM   #3
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They are pretty cheap. 45$ is what I paid for mine. Bosch part.
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Old 05-31-2008, 11:24 PM   #4
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They are nice until you start pushing 15+ PSI then they flutter like mad. Mine was super smooth and always worked well with no flutter on my stock T3 even up to 15 PSI. Didn't like my T3/T4 hybrid though.
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Old 05-31-2008, 11:30 PM   #5
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Well yeah. I'm running 7psi. That's a reason I chose it.
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Old 05-31-2008, 11:55 PM   #6
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Better yet, forge makes a drop-in replacement that's great for 1 bar+ applications, it's only ~$100 too iirc and you get a few different springs etc.

I got one for my car after the diaphragm went on my stock bosch diverter
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Old 05-31-2008, 11:59 PM   #7
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007 woulda rocked
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Old 06-01-2008, 02:08 PM   #8
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Default bypass valve

I used to use that one. If failed on me so I bought the SaaB direct replacement version made by Forge. It's not the rebuildable one but it is the next level with a piston and seal instead of the diaphragm style.
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Old 06-01-2008, 02:39 PM   #9
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What psi?
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Old 06-01-2008, 09:38 PM   #10
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Quote:
Originally Posted by Homer View Post
What psi?
I know a bunch of people who are putting 20+ psi through their forge CBV's, they're pretty much the only replacement for the bosch that you can get away with on the trionic 7 cars and they seem to be designed accordingly





you know you want it
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Old 06-01-2008, 11:21 PM   #11
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No. I know I want the faster diaphragm type.
I was asking what psi dave's failed at.
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Old 06-01-2008, 11:26 PM   #12
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I've been wanting to get the turbosmart plumb back valve for my turbo car. would be able to choose between BOV/CBV type set up.
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Old 06-01-2008, 11:27 PM   #13
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forge 007>>>>>>>710n, or whatever yours it

They're good for like infinity psi. no failures!
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Old 06-02-2008, 12:37 AM   #14
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Quote:
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No. I know I want the faster diaphragm type.
I was asking what psi dave's failed at.
It gave a good service life of a couple of years running 12-13psi. I think it failed due to my kjet not having a path to shoot the air directly to the turbo inlet. My air return is a bit further away. With wide open throttle and low boost like 6psi it works great. But in the area from around 8-10psi or so I get a backfire out the tailpipe which I think is caused by the airflow reversing and popping the air flow sensor closed. That may also have affected the cbv. When it failed it had a punctured diaphragm causing idle vacuum to go up to around 4in hg. So I bought the Forge stock Saab replacement which is a sealed version for around $90 a few years ago. I think you'll be fine and for the price the Porsche/Audi one is worth using.

I've used the original all rubber unit for a year or so without failure. Upgraded to the brass insert Porsche/Audi unit which lasted for a couple of years. Then I bought the Forge Saab replacement unit which is about 3 years old now.
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Old 06-02-2008, 01:21 AM   #15
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Quote:
Originally Posted by MrBill View Post
forge 007>>>>>>>710n, or whatever yours it

They're good for like infinity psi. no failures!
Based on budget and current setup, the 710n best suited me. If I was running higher psi, forge is where its at.
Quote:
Originally Posted by dl242gt View Post
It gave a good service life of a couple of years running 12-13psi. I think it failed due to my kjet not having a path to shoot the air directly to the turbo inlet. My air return is a bit further away. With wide open throttle and low boost like 6psi it works great. But in the area from around 8-10psi or so I get a backfire out the tailpipe which I think is caused by the airflow reversing and popping the air flow sensor closed. That may also have affected the cbv. When it failed it had a punctured diaphragm causing idle vacuum to go up to around 4in hg. So I bought the Forge stock Saab replacement which is a sealed version for around $90 a few years ago. I think you'll be fine and for the price the Porsche/Audi one is worth using.

I've used the original all rubber unit for a year or so without failure. Upgraded to the brass insert Porsche/Audi unit which lasted for a couple of years. Then I bought the Forge Saab replacement unit which is about 3 years old now.
Good to hear.
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Old 06-02-2008, 08:14 AM   #16
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I'm tempted to use one of these in future, I have like 15+ of the Saab brass piston type sitting in my shed doing nothing, so if they start failing I won't run out of them for a while, and they only take 5 minutes to replace.

Turbosmart make this replacement:

http://www.turbosmartonline.com/index.php?id=44

Unfortunately their pics seem to be down at the moment! It's similar to the Forge valve, but adjustable with a knob.
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Old 06-02-2008, 08:17 AM   #17
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I'm running one Audis metal by-pass. Sound great
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Old 06-02-2008, 08:22 AM   #18
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looking good
(and nice welds btw!)
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Old 06-02-2008, 10:26 PM   #19
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Quote:
Originally Posted by MrBill View Post
forge 007>>>>>>>710n, or whatever yours it

They're good for like infinity psi. no failures!
tell that to us.. the audi dealer, who are replace POS forge valves left and right because they fail and make the car run terrible
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Old 06-02-2008, 11:12 PM   #20
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then they were not properly lubricated or something.

007 cant fail, its like.... not possible.
And as I said, I had a nice shiny 710n, it failed after like 300 miles
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Old 06-02-2008, 11:27 PM   #21
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nice welds.

when you had your BOV installed you had some idle issues eh?

this bosch unit doesn't make any noise?
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Old 09-29-2008, 10:22 PM   #22
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what about this knock off:

http://cgi.ebay.com/ebaymotors/_Car-...=p4506.c0.m245
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Old 09-29-2008, 10:29 PM   #23
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Quote:
Originally Posted by MrBill View Post
then they were not properly lubricated or something.

007 cant fail, its like.... not possible.
And as I said, I had a nice shiny 710n, it failed after like 300 miles
I agree, I don't think you could make it fail... I mean the worst possible thing that could happen is like, it might make a squeaking noise when the lube dries up. Other than that what could happen? Its a solid piece held down with a solid spring, whats there to break?
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Old 09-29-2008, 11:08 PM   #24
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I tried 3 different Bosch CBVs. They all sucked. They'd often stay open, not allowing boost to build.
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Old 09-29-2008, 11:17 PM   #25
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my 710n's are doing just fine
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