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Old 10-14-2006, 02:43 PM   #1
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Default What BOV to use?

Alright my diy T3 on my 1.8 is almost ready to be put on the car. I am juet trying to get som eopinions on what BOV you guys are using. Ill be using the stock AFM so I dont want one that will leak at idle or if is does i will need to but a one way valve so it won't leak. Anything out there for les that $100, im willing to spend money for a better product but it i dont have to that would be cool too.
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Old 10-14-2006, 02:47 PM   #2
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VTA would be preferable.
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Old 10-14-2006, 04:12 PM   #3
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The bosch-style valve is quite popular, Bell sells one for $55.
http://www.bellengineering.net/Pages...ata_parts.html

For VTA, you could add the JGS valve, for another $25
http://www.jgstools.com/turbo/index2.html

FM claims that the new GFB valve they sell can be used VTA with MAF.
http://www.flyinmiata.com/index.php?...umber=05-90110
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Old 10-14-2006, 05:58 PM   #4
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i have the gfb bov, works fine, sometimes i don't want it to be so loud though, everyone looks
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Old 10-14-2006, 11:52 PM   #5
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Pretty cool guys, what do you do for flanges for them?
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Old 10-15-2006, 01:35 AM   #6
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Dude, take a closer look at all of those bypass valves: none of them need flanges.
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Old 10-15-2006, 05:47 PM   #7
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Has anyone used the HKS blow off valves?
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Old 10-15-2006, 06:16 PM   #8
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Yes. They are the epitome of the "HEY LOOK AT ME" blow off valve. The high pitch chirp is aweful. If you must vent to atmosphere I would suggest a Tial. It sounds kind of like a whip and is not overly loud. Its also built like a tank.
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Old 10-16-2006, 01:25 PM   #9
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Quote:
Originally Posted by mx5roadster View Post
Pretty cool guys, what do you do for flanges for them?
No flange as such, but you'll need to fit a nipple into your I/C piping somewhere. I picked up a piece of 1.5" steel exhaust pipe, cut it in half with a 2.5" hole saw (to get the shape of the end correct) and then mig-welded it to the pipe in my system which feeds the intake manifold, after drilling a 1.25" hole in it.

Different BOVs, different sizes. In my case, I'm using an old-style FM BOV (Deal of the Day) which has a 1.375" inlet and outlet. I spent a whole afternoon riding around Vista / San Marcos carrying my BOV into every speed shop and industrial hose supplier I could find (more than a dozen in total) and nobody had that size. In the end, I found that 1.5" silicone will compress down far enough to seal on the 1.375" BOV, so I went with that.

The Bosch-style valves, IIRC, use a 1" flange so that's an easy one. Also, the JGS attachment comes with a reducer, so you should have no problems going with this setup.
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Old 10-16-2006, 01:58 PM   #10
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I feel like I'm repeating myself, as this thread seems to pop up alot. I have tested both the Porsche BOV (Bosch) and the Ebay "special" bov (turbo xs-H knock off) and I have found that both work awesome and run about 22 shipped. Depends on the sound you like.
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Old 10-16-2006, 02:24 PM   #11
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The bosch is 1" with a 1/16" lip. I thought it sounded great VTA, but you really should run a filter on it since it's not designed for VTA and that will kill some - most of the sound, depending on the filter.
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