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Old 03-22-2014, 01:37 AM   #26
940forlife
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Would a good place to install the bov be the pipe going from the turbo housing to the intercooler , and would I have to install a block off plate to the cbv??? help please
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Old 03-22-2014, 05:47 AM   #27
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I have the maf before turbo, and a hks ssq before intake, had the stall problem also... i removed the glue thing from idle valve, and played with the idle screw, after that everithing is ok, also sits at idle much better, raised it a bit. No stalling problem anymore.. also stay away from the cheap spring type BOV-s(greddy replicas) hks ssq works vice versa, and is the way to go, altough its an cheap ass replica.

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Old 03-22-2014, 02:18 PM   #28
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Originally Posted by 940forlife View Post
Would a good place to install the bov be the pipe going from the turbo housing to the intercooler , and would I have to install a block off plate to the cbv??? help please
Why are you installing a BOV if you a CBV???
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Old 03-22-2014, 04:30 PM   #29
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Why are you installing a BOV if you a CBV???
cause I wanna delete the cbv using a block off plate , aha I want the bov sound
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Old 03-22-2014, 04:52 PM   #30
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Would a good place to install the bov be the pipe going from the turbo housing to the intercooler , and would I have to install a block off plate to the cbv??? help please
It will work on the hot side, but it's not the most optimal. You will need a block off plate if you install a bov.
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Old 03-28-2014, 11:03 AM   #31
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http://www.ebay.ca/itm/Kinugawa-Bill...vxp=mtr&_uhb=1


Lemme knowwhaqt you guys think aha
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Old 03-28-2014, 11:42 AM   #32
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aha about what?
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Old 03-28-2014, 12:09 PM   #33
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I'll post my experience with the Kinugawa sometime next week. I'm throwing on the BOV on a 15G and installing it this weekend.
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Old 03-28-2014, 10:47 PM   #34
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Hi, everyone. I need an explanation on how it's ok to dump air to atmosphere that fuel has already been metered for. I don't get this whole bov thing. Is it higher performance? Air goes through MAF. MAF signals to computer. Computer injects fuel. Throttle then closes, forcing BOV to dump air that fuel has just been metered for. Am i missing something? Why is it ok to use a bov on an airflow/air mass measuring system? This seems like something that would only be ok on a speed density car.
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Old 03-28-2014, 11:16 PM   #35
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It keeps the turbo happy. The throttle slams shut, it has to go somewhere, and back through the turbo compressor is out of the question, especially at higher boost pressure. If you can't tune for an atmospheric BOV, then you get a recirculation BOV and dump the air back into the the system at the MAF.
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Old 03-28-2014, 11:29 PM   #36
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Originally Posted by 122ti View Post
Why is it ok to use a bov on an airflow/air mass measuring system?
It's not.

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This seems like something that would only be ok on a speed density car.

Kjet is ok with it too.
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Old 03-28-2014, 11:48 PM   #37
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Thanks. I just wanted to hear someone else say it. Everyone just ignored that German guy. I mean, it's like an unmetered air leak in reverse.
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Old 04-07-2014, 04:20 PM   #38
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adjust the idle air control screw till you can rev it and it doesn't idle...i don't think shimming your stuff will work...adjusting that on all my auto cars did the trick
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Old 04-07-2014, 04:35 PM   #39
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Quote:
Originally Posted by 122ti View Post
Hi, everyone. I need an explanation on how it's ok to dump air to atmosphere that fuel has already been metered for. I don't get this whole bov thing. Is it higher performance? Air goes through MAF. MAF signals to computer. Computer injects fuel. Throttle then closes, forcing BOV to dump air that fuel has just been metered for. Am i missing something? Why is it ok to use a bov on an airflow/air mass measuring system? This seems like something that would only be ok on a speed density car.
Thanks,
Dave
why a bov? kids like to listen to loud noises from slow turbo cars apparently. That's only slightly sarcastic. In the grand scope of things, having a way to allow the compressor to free spin without air going backwards through the turbo helps with longevity and to a degree transitional response between gears (in a manual car that's not flat shifted).

venting it is not required, and on a MAF based car is not generally a good idea regardless of what everyone wants to cry about working and functioning. It probably can be fiddled with until it works decently well, however if you re-circulate the air to pre-turbo inlet post-maf, you have no issues to worry about with regards to shimming unless you're blowing the cbv open.

If you have a speed density car, you can get away with a bov and to some degree it makes more sense in terms of underhood plumbing.. recirculating or not at that point really doesn't matter either way.

Regardless of which route you choose, for whatever personal reasons you choose it, cheaping out on such things is almost certainly going to cause you trouble and heartaches down the road.

as far as issues, some are prone to getting blown open in boost, I've had one stick shut on me before (not the end of the world but annoying. easy to fix)
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Old 04-07-2014, 06:27 PM   #40
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I totally get the need for pressure relief when the throttle closes, i just thought i was missing something about how the blow off valve works. I guess we can say it's not a "correct" way to dump pressure, but can be made to work.
Thanks, Gents.
Sorry if I thread jacked.
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Old 04-21-2014, 10:41 PM   #41
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adjust the idle air control screw till you can rev it and it doesn't idle...i don't think shimming your stuff will work...adjusting that on all my auto cars did the trick
Im having an issue were i installed a bov right on to were the stock cbv valve is and it works but when i let off the gas after boosting the turbo it stalls , i wqs think it might have somthing todo with thw idel or what not, i really need to fix this asap
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Old 04-22-2014, 12:52 AM   #42
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Im having an issue were i installed a bov right on to were the stock cbv valve is and it works but when i let off the gas after boosting the turbo it stalls , i wqs think it might have somthing todo with thw idel or what not, i really need to fix this asap
I don't even know what that says.
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Old 04-22-2014, 07:23 AM   #43
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So, when you put on the blow off valve it stalls, and when you use the CBV it runs fine....hmmm . Doctor, it hurts when I do this....
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Old 04-22-2014, 08:53 AM   #44
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lol. tbricks world problems.
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Old 04-22-2014, 09:09 AM   #45
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I don't understand the BOV over CBV thing. It came from the factory with what it needs to run correctly and if you must have that sound then get rid of the air box and stick a K&N on there. The car will run correctly and go pshh every time the throttle closes.
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Old 04-22-2014, 09:12 AM   #46
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Biggest reason I can think of is the CBV diaphragms tear easily, so going to a diagphram-less BOV like the Synapse is optimal for higher boost levels. Or you run a Holset or similar that doesn't have a CBV. Or you have a TD04H at 12 psi and want the sound.
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Old 04-22-2014, 09:39 AM   #47
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My ebay turbo didn't come with a CBV, this is why I have an HKS SSQV, running lh2.2. The problem arises because the air pulled through the MAF when the BOV actuates by the still spinning but decelerating turbo causing some fuel to be injected for air that never reaches the intake manifold, however if you lift your foot all the way, lh2.2 turns off the fuel because the TPS switch is closed, so no rich conditions. I assume this function is carried over to LH2.4 so OP maybe check that your TPS is functioning properly.
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Old 04-22-2014, 02:18 PM   #48
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Quote:
Originally Posted by 940forlife View Post
Im having an issue were i installed a bov right on to were the stock cbv valve is and it works but when i let off the gas after boosting the turbo it stalls , i wqs think it might have somthing todo with thw idel or what not, i really need to fix this asap
FWIW, I ran a Kinugawa BOV for about a week on my 15G, it's the kind that goes over top of the CBV openings on the compressor housing. Even with the heaviest spring and 5 shims, it was still opening around 19 inches of vac. Caused horrid over-reacting super lean conditions on acceleration from stop. Swapped the BOV for a stock 16T CBV, and the car is happy as can be. No issues, whatsoever.

The reason for my adventure is the 15G I pulled from an ex-turbobricker's car had a CBV blockoff plate and a BOV elsewhere in the engine bay. I wish I had pulled it now, but meh. The Kinugawa was my cheapest option, so I picked it up and it didn't work out for me. Made some fun noises, but not worth the trouble.
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Old 04-26-2014, 12:51 AM   #49
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If I install a block off plate on the cbv and then add a bov near the intake and then connect the vacuum hose to it , should it work fine .... Yea ik all this talk about the cbv being the best because its stock but tbh I just really want the sound plus ik it dose help a bit on the performance side of things. I am also going to be installing a Kinugawa actuator with the spring set to 0.8 bar. I was told the block can't handle much more than that seeing as I wanna keep it somewhat reliable. Im also putting on a high flow cat to match my magna flow exhaust, and does any one know were I can get a better air box setup so i can slap a K&N cone filter on it maby get a little more sound out of her aha , Btw this car has only 90,000km on it and is in mint shape so i have a good base to start with aha lemme know if u think their are any other performance wise upgrades i should do , my goal is about 220 - 250 hp but Id be fine with 220 , just wanna have a little more fun aha

Last edited by 940forlife; 04-26-2014 at 12:53 AM.. Reason: spelling
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