Please don't castrate me: BOV / CBV Question

decalservice · 01-01-2009, 02:59 AM

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)

Grateful they are still hanging, -
Rod

F1reBird · 01-01-2009, 03:33 AM

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

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.

decalservice · 01-01-2009, 04:08 AM

Gotcha. It's an '82, k-jet of course

decalservice · 01-01-2009, 04:17 AM

What size is the outside diameter of the ic cold pipe on my 82? Maybe I should get off my ass and measure it =)

Gabe244 · 01-01-2009, 04:26 AM

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?

F1reBird · 01-01-2009, 04:50 AM

ah K-jet... yea it should run a BOV just fine.

RvolvoR · 01-01-2009, 05:12 AM

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...

DanielRogers · 01-01-2009, 09:39 AM

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).

decalservice · 01-01-2009, 06:55 PM

Thanks guys!

streetrider · 01-01-2009, 07:41 PM

you need one of these

http://www.turbowhistler.net/?gclid=...FQsQagodYlCDBw

seriously though, cbv>bov

DecalServiceBrett · 01-01-2009, 08:34 PM

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

01-01-2009, 09:01 PM

No. Bosch 007 is the one that is desireable. (Comes stock on the cars in the VAG group such as VW, Audi, Skoda, Porsche)

DecalServiceBrett · 01-01-2009, 09:14 PM

Quote:

Originally Posted by frpe82

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.

GhengisKhan · 01-01-2009, 09:16 PM

CBV FTW! And it's plenty loud without being obnoxious.

DecalServiceBrett · 01-01-2009, 09:20 PM

Quote:

Originally Posted by ghengiskhan

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

decalservice · 01-01-2009, 09:52 PM

Quote:

Originally Posted by RNAsEqUeNcE

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)

DecalServiceBrett · 01-01-2009, 09:57 PM

Quote:

Originally Posted by decalservice

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

cjjiii · 01-01-2009, 10:08 PM

Quote:

Originally Posted by frpe82

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?

decalservice · 01-01-2009, 10:18 PM

forge 007 = bosch 004?

decalservice · 01-01-2009, 10:20 PM

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?!?

01-01-2009, 10:26 PM

Quote:

Originally Posted by decalservice

forge 007 = bosch 004?

Forge 007 = Bosch 007 as far as I know

Roger-Dee · 01-01-2009, 11:18 PM

Quote:

Originally Posted by RvolvoR

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...

RvolvoR · 01-01-2009, 11:23 PM

oh yeah, the spring in mine also broke

Roger-Dee · 01-02-2009, 12:22 AM

The second piston spring ? If you want one I still got mine laying somewhere :P

RvolvoR · 01-02-2009, 01:26 AM

the bigger one, mine was yellow..

01-01-2009, 02:59 AM	#1
decalservice Stickin' it to the world! Join Date: Oct 2008 Location: Austin, TX.	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) Grateful they are still hanging, - Rod __________________ Www.DecalService.coM** (512) 228-8811 Austin, TX. "Now with more lasers!" Last edited by decalservice; 01-01-2009 at 03:22 AM..

01-01-2009, 04:26 AM	#5
Gabe244 Board Member Join Date: Jul 2007 Location: Brisbane, Australia	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? __________________ - '82 244 B23E, Zenith Carb, Lowered, 10.5:1 cr, 38mm exhaust valves and p&p'd 405 Head. -'87 245 GF's car -'86 245 parting -'80 262 Sold -'83 244 cube -'81 244 cube

01-01-2009, 08:34 PM	#11
DecalServiceBrett Board Member Join Date: Apr 2007	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 __________________ rofl

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

01-01-2009, 04:08 AM	#3
decalservice Stickin' it to the world! Join Date: Oct 2008 Location: Austin, TX.	Gotcha. It's an '82, k-jet of course

01-01-2009, 04:17 AM	#4
decalservice Stickin' it to the world! Join Date: Oct 2008 Location: Austin, TX.	What size is the outside diameter of the ic cold pipe on my 82? Maybe I should get off my ass and measure it =)

01-01-2009, 04:50 AM	#6
F1reBird uo ƃuıoƃ sʇɐɥʍ ˙˙˙sǝou ɥo Join Date: Jun 2005 Location: Pleasant Hill, CA	ah K-jet... yea it should run a BOV just fine.

01-01-2009, 05:12 AM	#7
RvolvoR Board Member Join Date: Jun 2003 Location: PDX	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...

01-01-2009, 06:55 PM	#9
decalservice Stickin' it to the world! Join Date: Oct 2008 Location: Austin, TX.	Thanks guys!

01-01-2009, 07:41 PM	#10
streetrider Board Member Join Date: Oct 2008	you need one of these http://www.turbowhistler.net/?gclid=...FQsQagodYlCDBw seriously though, cbv>bov

01-01-2009, 09:01 PM	#12
frpe82 Guest	No. Bosch 007 is the one that is desireable. (Comes stock on the cars in the VAG group such as VW, Audi, Skoda, Porsche)

01-01-2009, 09:16 PM	#14
GhengisKhan Board Member Join Date: May 2007 Location: Republic of Texas	CBV FTW! And it's plenty loud without being obnoxious.

01-01-2009, 10:18 PM	#19
decalservice Stickin' it to the world! Join Date: Oct 2008 Location: Austin, TX.	forge 007 = bosch 004?

01-01-2009, 10:20 PM	#20
decalservice Stickin' it to the world! Join Date: Oct 2008 Location: Austin, TX.	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?!?

01-01-2009, 11:23 PM	#23
RvolvoR Board Member Join Date: Jun 2003 Location: PDX	oh yeah, the spring in mine also broke

01-02-2009, 12:22 AM	#24
Roger-Dee is DeeWorks.ca Join Date: Aug 2006 Location: Sherbrooke, Qc	The second piston spring ? If you want one I still got mine laying somewhere :P

01-02-2009, 01:26 AM	#25
RvolvoR Board Member Join Date: Jun 2003 Location: PDX	the bigger one, mine was yellow..