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Old 01-04-2007, 10:37 AM   #1
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Default Dual Drive BOV?

https://www.miataturbo.net/forums/showthread.php?t=6510

Has anyone in here ever used one or had expierience with this bv, im considering it since I need a bv, but would'nt you haft to recirculate to the intake tract to avoid idle droop?
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Old 01-04-2007, 10:47 AM   #2
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Dude...go back and search on some of your old posts. I think I recall answering this questions of yours at least once before.

Yes, when using the stock ECU, a vent-to-atmosphere bypass valve will cause an overly rich condition on throttle let-off, which can cause bucking/hiccups, backfires, throttle transition problems and yes, a leak at idle, causing it to run lean while idling.

Now, if it's able to be tightened, you might be able to make it not leak at idle, but it'll likely be so tight at that point that it won't properly "blow-off" under throttle transitions, meaning your bypass valve isn't even doing what it was built to do at that point...and you'll have the turkey gobble all over again.

See why people with stock ECUs just use recirculating systems?
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Old 01-04-2007, 01:27 PM   #3
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-(quote:zoom2zoom)-it doesn't recirculate, but I'm almost positive it has the check valve built in.-

I know this already to my better knowledge, above is the only reason i asK about this, I know you have to recirculate the bv in order to avoid idle droop and what not, in order to vent the bv to the atmosphere you need the run a stand-alone or ecu capable of ditching the maf...Iknow all of the above, I just had a conflicting thought is all , repost my bad.
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Old 01-04-2007, 01:31 PM   #4
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Basically im being told That I dont haft to recirculate this blow-off, which is not the case because Im still using the maf. venting would only cause unwanted issues unless using a stand-alone ecu with the capabilities of ditching the maf....anyways Im making to big a deal of somthing small....I already know what to do.
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Old 01-04-2007, 01:35 PM   #5
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Why even run a bov in the first place less hastle man.
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Old 01-04-2007, 02:09 PM   #6
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Because a bypass valve will help keep the turbo spooled on throttle transitions (e.g. when upshifting) and prevent the dreaded turkey gobble...side benefit is it'll like help the life of your turbo.
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Old 01-04-2007, 02:16 PM   #7
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turkey gooble = compressor surge

compressor surge = dead turbo

dead turbo =
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Old 01-04-2007, 03:12 PM   #8
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I thought dead turbo = upgrade?

Frank
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Old 01-04-2007, 03:14 PM   #9
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Quote:
Originally Posted by fmowry View Post
I thought dead turbo = upgrade?

Frank
Never thought of it that way...but he's right, LOL
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Old 01-04-2007, 03:24 PM   #10
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Quote:
Originally Posted by fmowry View Post
I thought dead turbo = upgrade?

Frank
and upgrade means BOV next time:gay:
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Old 01-04-2007, 03:40 PM   #11
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Quote:
Originally Posted by RicanmiataRacer View Post
https://www.miataturbo.net/forums/showthread.php?t=6510

Has anyone in here ever used one or had expierience with this bv, im considering it since I need a bv, but would'nt you haft to recirculate to the intake tract to avoid idle droop?
I know someone is going to jump my **** on this one, but i got the ETD crossover pipe with a TurboSmart BOV Venting to Air and have never had a problem with rough idle/running too terribly rich on shifts/etc... I'm not saying that noone will, just that there are some VTA setups that aren't going to give you alot of hassle.....

http://www.etdracing.com/miatatube.html

also the site says that after shipping the X-over is $290 with the BOV....i only payed 150 and have absolutely no affiliation with ETD at all and didn't try to haggle them or anyhting...again maybe a fluke, but figured i'd share
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Old 01-04-2007, 03:52 PM   #12
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Yeah, I'm sure there is an "ideal" setting for VTA bypass valve tension that causes the least amount of problems, as it seems you've found that fine line and stuck to it. But, again, is the VTA really worth the trouble?

I always thought it sounded kinda lame...like you're screaming for attention on the road.
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Old 01-04-2007, 03:54 PM   #13
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you can do it....there are just a few reasons why some (including myself) don't. I driven two VTA miatas that have no trouble idling (3 if include mine back-in-the-day), they don't have a WB or we might see that when I shift I go lean, whereas they'll go pig rich.
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Old 01-04-2007, 07:50 PM   #14
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gooble gooble i dunno i kinda like that sound
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Old 01-05-2007, 03:36 PM   #15
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the deal of the day on flyin miata (friday the 5th) is a VTA for $110 that looks fairly similar to the turbosmart i have that gives me no problems and it's advertised to not give you any problems even with the MAF still installed on the car

http://www.flyinmiata.com/dealoftheday/index.php

might wanna give it a shot if it's still available
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Old 01-05-2007, 05:40 PM   #16
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Quote:
Originally Posted by braineack View Post
you can do it....there are just a few reasons why some (including myself) don't. I driven two VTA miatas that have no trouble idling (3 if include mine back-in-the-day), they don't have a WB or we might see that when I shift I go lean, whereas they'll go pig rich.
MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE!!!!!!!!!!!!!!!!!! !!!!!!!!!!

Get a Greddy RS. No Leak on Idle.
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Old 01-05-2007, 05:43 PM   #17
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ah yes, and yours that idled fine....I take it you're still VTA.
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Old 01-05-2007, 11:28 PM   #18
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I am VTA currently, no idling problems, but when you lift off the throttle, afr's jump to 10.5 or less. Goes way too rich. I have no other real issues except when I get back on the throttle, it is a real quick hesitation. I would definately be recirculating back if I would not have gotten this BOV for free from a friend. The blowoff valve is a megan racing off of ebay, works good for what it was built for.
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Old 01-05-2007, 11:47 PM   #19
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ahhh see, exactly what I'm talking about. Most don't care, but I'd rather go lean during shifts.
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Old 01-06-2007, 12:18 AM   #20
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I'm running a turbo XS BOV and it doesn't leak at idle, has no idle droop, no hiccups or bucking, jus runs great!!
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