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Old 04-15-2009, 10:59 PM   #1
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Atmospheric BOV

What does the car do if you vent the BOV to atmosphere? I know it will stutter but does it make it undriveable? How do Mitsu guys get Psshhh sound... Do you have to get rid of the MAF system and go with a MAP setup and standalone?

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Old 04-16-2009, 10:22 PM   #2
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What does the car do if you vent the BOV to atmosphere?
-runs rich for that duration

I know it will stutter but does it make it undriveable?
-no

How do Mitsu guys get Psshhh sound... Do you have to get rid of the MAF system and go with a MAP setup and standalone?
-different BOV make different sound, no need to modify flow sensor/anything. aftermarket intake filter will enhance sound.
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Old 04-16-2009, 10:25 PM   #3
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If you run a blowthrough MAF after the BOV it shouldn't run irch or stumble or anything. MAP is better though IMO. I use it, love it.
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Old 04-16-2009, 10:36 PM   #4
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I disconnected the BOV from the recirc pipe and blocked off the intake tube that fed the pipe. It seemed really undriveable as when I would be coasting or at part throttle the BOV would be opening and the car would stumble like a bitch. Did you convert your 4G to MAP? What did it take to do that?

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Old 04-16-2009, 11:40 PM   #5
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May I suggest a Splitter Valve? I went from running a Diverter Valve to a splitter valve and I love it. Especially if you have a car with a sensitive MAF which may think the car has a leak if you run an atmospheric BOV.

I know that Forge makes a splitter valve and they're reasonably priced. The one I am using is called a GFX Hybrid valve.

The whole point of the splitter valve is so that you can chose your application. For example I have it on a 60/40 setting so that 60% of the air is being recirculated and 40% is being blown off. I love the sound of it and I usually don't get any fluttering. Something you might want to look into.
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Old 04-17-2009, 07:31 AM   #6
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on a 4G63 or a 6A12 you are going to have a 50/50 chance of stalling EVERY TIME you lift off from a high boost/rev switching the gear into neutral.

that's why I run MAF-T.
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Old 04-17-2009, 09:26 AM   #7
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what is MAF-T edumecate me! I know everything about Honduh's but nothing about DSM yet!


Berz out.
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Old 04-17-2009, 10:22 AM   #8
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what is MAF-T edumecate me! I know everything about Honduh's but nothing about DSM yet!


Berz out.

uses the gm maf which allows the blow through setup up. basically maf-t is spliced into your stock maf connection and sorta dummies the ecu to thinking its using the normal maf
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Old 09-04-2009, 12:15 AM   #9
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but it's also finnicky so you might have funny driveability problem if the initial install was wrong. But once you got past that, it's smooth sailing all the way.
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Old 11-13-2009, 02:31 PM   #10
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venting to astmospher makes it sound better, recirc is better performnce
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Old 06-11-2010, 12:59 PM   #11
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If you care about performance, recirculate. Sure it sounds cool, but you have to put in a lot of work to get it to run smoothly after changing, and work on the ECU. I say install a button to a can of compressed air like a horn if you really care about what it sounds like. It's how the car runs that matters.
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