added BOV to greddy kit, problem.. - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-26-2009, 12:58 PM   #21
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Plenty of guys run the Chinese knockoff BOV's for thousands of miles with no problems... but the reliability/build quality is definitely not on par with name-brand production models. My bet is that the guts of yours are faulty or simply stuck. Without pics/video there is no help to be had, WE NEED A PICTURE OF HOW YOUR BOV IS SETUP/INSTALLED, AND THEN REMOVE IT, DISASSEMBLE IT, AND TAKE A PICTURE OF THE GUTS.
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Old 02-26-2009, 01:22 PM   #22
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Quote:
Originally Posted by samnavy View Post
My bet is that the guts of yours are faulty or simply stuck.
the noob concurs... try to spray some lube on the plunger and cycle it manually a few times, see if that does anything.
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Old 02-26-2009, 02:24 PM   #23
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Does your BOV have 2 ports on it? if it does do you have on hooked up to a vacuum source, between the engine and throttle body, and the other some were between the turbo and the throttle body?
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Old 02-26-2009, 02:32 PM   #24
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Quote:
Originally Posted by Sleeper_MX5 View Post
Get a real BOV... the china BOV are garbage.
Shrug they work. I had a greddy RS knockoff and it was quite nice. It started to stick, quick dissassembly and lube job and it was back to working perfectly.
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Old 02-26-2009, 02:51 PM   #25
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Ya Ive had 2 knock offs and they both work fine, both from CX racing. The only reason I got 2 is because I sold the first one with my old intercooler, It was the HKS style.
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Old 02-26-2009, 03:13 PM   #26
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Are you driving it or just revving it? Boost won't build without load.. Check you boost gauge.
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Old 02-26-2009, 04:38 PM   #27
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he said he drove it up the street.
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Old 02-26-2009, 06:14 PM   #28
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Getting a greddy type RS today for 120 so I'll see for sure today.
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Old 02-26-2009, 10:22 PM   #29
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Hmm, it was someone else that said they drove it up the street with the same issue. It was just a thought at any rate.. Good luck getting it back up. My Forge BOV is connected at the very first vacume line at the throttle Body with no problems..
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Old 02-26-2009, 10:27 PM   #30
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All is well with the RS, and sounds great. If anyone wants a china BOV I'll be throwing it on the FS section for super cheap (+ shipping) - may work with lube.
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Old 02-27-2009, 12:22 AM   #31
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My bov has two vacuum ports on it but it came with a T fitting to I have both of them hooked up to that, I'm getting my vacuum from the brake booster, same place I have my boost gauge hooked to.
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Old 02-27-2009, 09:16 AM   #32
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Quote:
Originally Posted by thegizzman View Post
My bov has two vacuum ports on it but it came with a T fitting to I have both of them hooked up to that, I'm getting my vacuum from the brake booster, same place I have my boost gauge hooked to.
I am having trouble visualizing this, but I think it's wrong. One port should be hooked to vacuum, the other should be hooked only to boost, otherwise the valve will never open.
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Old 02-27-2009, 10:17 AM   #33
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Installing a Greddy Type S BOV in a DSM Eclipse/Talon/Laser shows how to hook up the type S. Make sure it's put on that way. The T fitting should be to tap off the manifold vac line.
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Old 02-27-2009, 10:48 AM   #34
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Quote:
Originally Posted by Sleeper_MX5 View Post
Get a real BOV... the china BOV are garbage.
Interestingly, I had precisely the opposite experiance.

My first BOV was the machined aluminum piston-style unit made by FM. It worked fine for a while, then started to get sluggish and siezed. I disassembled and cleaned it, re-lubed the piston, and put it back in. Again, fine for a while, then stopped working.

Called FM, discussed the situation. They suggested that they are not typically failure-prone, but that they do require lubrication "about every other oil change." Heck, I was getting less than a thousand miles out of it.

Disassembled again, cleaned everything with alcohol, used some fine sandpaper to polish the piston and bore, re-lubed, re-assembled, and the same thing.

I trashed it and replaced it with a cheap Chinese-made "Type RS" BOV that I bought from an eBay vendor for <$50 shipped. I took it apart and removed the inner spring, installed it, and it's been working trouble-free for about 2 years with no adjustment and no maintenance.
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Old 02-27-2009, 10:57 AM   #35
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Quote:
Originally Posted by thegizzman View Post
My bov has two vacuum ports on it but it came with a T fitting to I have both of them hooked up to that, I'm getting my vacuum from the brake booster, same place I have my boost gauge hooked to.
That is definitly an issue. Assuming the ebay bov is plumbed just like the Greddy it copies... as mentioned right below your post... one to vac and other to boost.

Top one will get a source from between the engine and the throttle body. The other can be left open or you can tap it into the charge piping if you wish.

With both hooked up together.... they fight each other as one is a "push" and the other is a "pull"
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Old 02-27-2009, 01:38 PM   #36
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Thanks splitime that worked, well kinda I hear the bov go off now but its so quite. It sounds like I'm just blowing air out of my mouth when it goes off. I don't have compressor surge anymore though so that's good. I have it adjusted as loose as it will go and took one of the sprigs out.
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Old 02-27-2009, 01:43 PM   #37
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Quote:
Originally Posted by thegizzman View Post
I hear the bov go off now but its so quite. It sounds like I'm just blowing air out of my mouth when it goes off.
Do you consider this to be a bad thing?
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Old 02-27-2009, 02:20 PM   #38
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Ha noooo its just quieter then I expected, I would like it to be just a hair louder nothing stupid loud. I'm just happy I don't have compressor surge any.
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