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Old 01-01-2009, 02:59 AM   #1
decalservice
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Default Please don't castrate me: BOV / CBV Question

Update: I have read the thread Dana answered questions on, but figured asking you guys to see if any "advancements" have been made since then one way or another.

OK guys, the only reason I ask this is because through my searches for the past 2 hours on turbobricks and on the web, I get conflicting viewpoints:

What's the best option for my intercooled b21ft which will be running around 12 - 14 psi? BOV or CBV? Which would yield better response, which would be louder?

Thank you for your time, and apologize in advance for "that same ****in' question again"

Don't cut em off... I tried searching. Made me even more confused.

From what I can gather, a BOV -MIGHT- be better due to no AMM, but still, I hear people saying they had issues.

I'd like it "semi-loud" with the least potential for stalling or other issues. What are some types / brands under $100 suggested for my application?

(I've got a 20% off coupon with eBay, and I'd like to buy one from there... if possible, point me to a good item)

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Last edited by decalservice; 01-01-2009 at 03:22 AM..
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Old 01-01-2009, 03:33 AM   #2
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BOV will always be louder because it vents to the atmosphere.

i wouldn't skimp on generic brand BOV's because they might leak, not hold boost, and not last as long.

CBV's wont be as loud but i like them better because it wont rich spike when the air is vented.

i know of some people who have had thier engines run pig rich to the point where they stall after a vent.


i would get a CBV..

I'm getting this one..which is a forge.





heres my thread about the CBV's
http://forums.turbobricks.com/showthread.php?t=143327


what year is your car?


Quote:
Originally Posted by decalservice View Post
From what I can gather, a BOV -MIGHT- be better due to no AMM, but still, I hear people saying they had issues.
it's not that a BOV will be better on a car without an AMM, it's cars with no AMMs run BOVs better than cars with AMMS.
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Old 01-01-2009, 04:08 AM   #3
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Gotcha. It's an '82, k-jet of course
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Old 01-01-2009, 04:17 AM   #4
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What size is the outside diameter of the ic cold pipe on my 82? Maybe I should get off my ass and measure it =)
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Old 01-01-2009, 04:26 AM   #5
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bov's on k-jet should be fine. It'd be pretty damn hard to get the bov in after the metering plate. Isnt there an article about bov's on k-jet?
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Old 01-01-2009, 04:50 AM   #6
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ah K-jet... yea it should run a BOV just fine.
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Old 01-01-2009, 05:12 AM   #7
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bov, kjet, good to go....bah, im startin to hate my forge twin piston BOV....the bitch still causes some audible surging w my giant comp wheel...
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Old 01-01-2009, 09:39 AM   #8
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Another advantage of CBV is that it keeps the turbo wheel spinning while venting pressure, making it easier and faster to build up pressure again (i.e. useful when shifting).
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Old 01-01-2009, 06:55 PM   #9
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Thanks guys!
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Old 01-01-2009, 07:41 PM   #10
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you need one of these
http://www.turbowhistler.net/?gclid=...FQsQagodYlCDBw


seriously though, cbv>bov
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Old 01-01-2009, 08:34 PM   #11
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ROD

I ran a bov on my KJET car and it was terrible, it was a knock off though. That thing was open at idle, and my driveability was terrible.

I would recommend a CBV, like a bosch 004



You want that air back into the system, because KJET AND b21S DO NOT LIKE DUMPING FUEL INTO THE CYLS BECAUSE A BOV BLEW OFF ALL THAT METERED AIR!

my sh!t spiked super rich and it totally SUCKED

oh, and you need to get an AIM account and use www.pidgin.im
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Old 01-01-2009, 09:01 PM   #12
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No. Bosch 007 is the one that is desireable. (Comes stock on the cars in the VAG group such as VW, Audi, Skoda, Porsche)
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Old 01-01-2009, 09:14 PM   #13
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Quote:
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No. Bosch 007 is the one that is desireable. (Comes stock on the cars in the VAG group such as VW, Audi, Skoda, Porsche)
Sorry, thought it was a 004. I read it wrong.
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Old 01-01-2009, 09:16 PM   #14
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CBV FTW! And it's plenty loud without being obnoxious.
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Old 01-01-2009, 09:20 PM   #15
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Originally Posted by ghengiskhan View Post
CBV FTW! And it's plenty loud without being obnoxious.
Your's sounds like "Dieing Goat Breath" as you said

You need a real CBV in there :P
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Old 01-01-2009, 09:52 PM   #16
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Quote:
Originally Posted by RNAsEqUeNcE View Post

oh, and you need to get an AIM account and use www.pidgin.im
Dun dada dun! Pidgin get!!!!

Armed with power of the Pidgin, I'm ready to annoy on a whole new level!!!

J.K. man hit me up with the info to contact you... I have AIM, havent used it in a while though.
I'll be on as rvr0004 for now. (aim)
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Old 01-01-2009, 09:57 PM   #17
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dun dada dun! Pidgin get!!!!

Armed with power of the pidgin, i'm ready to annoy on a whole new level!!!

J.k. Man hit me up with the info to contact you... I have aim, havent used it in a while though.
I'll be on as rvr0004 for now. (aim)
skeet skeet
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Old 01-01-2009, 10:08 PM   #18
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Quote:
Originally Posted by frpe82 View Post
No. Bosch 007 is the one that is desireable. (Comes stock on the cars in the VAG group such as VW, Audi, Skoda, Porsche)
I think he was thinking of the Forge 007 is this the same as the Bosch 004?
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Old 01-01-2009, 10:18 PM   #19
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forge 007 = bosch 004?
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Old 01-01-2009, 10:20 PM   #20
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Hold up sons... In reality, if I leave the exhaust port on the CBV disconnected, it will in essence be a blow off valve, correct? I mean whats the difference?!?
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Old 01-01-2009, 10:26 PM   #21
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forge 007 = bosch 004?
Forge 007 = Bosch 007 as far as I know
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Old 01-01-2009, 11:18 PM   #22
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Quote:
Originally Posted by RvolvoR View Post
bov, kjet, good to go....bah, im startin to hate my forge twin piston BOV....the bitch still causes some audible surging w my giant comp wheel...
I think I got that same bov, I actually removed the second plastic piston because the preload on it is way too much. I was experiencing surge before the removal, I also e-mailed forge to let them know and he replied with a lesson on how bov works...
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Old 01-01-2009, 11:23 PM   #23
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oh yeah, the spring in mine also broke
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Old 01-02-2009, 12:22 AM   #24
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The second piston spring ? If you want one I still got mine laying somewhere :P
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Old 01-02-2009, 01:26 AM   #25
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the bigger one, mine was yellow..
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