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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 11-20-2012, 10:25 PM   #81
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Don't use a shitty plastic bov. Ever. I'm serious. They almost always leak
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Old 11-21-2012, 01:28 AM   #82
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the yeah the 710N was common on the Audi stuff and I remember dealing with those things years ago. that valve was revised several times to make it more stout and the 710n was the result. remember the placement of the valve on the a4 is right next to the turbo and many of the a4s are running about 20+PSI. point being if you locate it away from the turbo it should be fine as a cheap option if you don't wanna spend like 250 bucks on a BOV.

I would stay away from the Forge and Baily o34 style valve a diaphram or a o-ring and piston. personally I would go oem off another car, like the a4 bosch valve or do something like the synapse. forget the middle of the road ****, I had one that blew a diaphram and one with a piston that would seize up from time to time.
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Old 11-21-2012, 01:31 AM   #83
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just to be clear o34 has awesome stuff and I did not use that valve, but the similar forge and baileys valve suck in my limited experience.
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Old 11-21-2012, 01:58 PM   #84
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I've been running forge for a while now.. probably a year, just took it apart yesterday. Everything is still in new condition but the 1 o ring that is ripped. I'll replace the o ring with something from ace hardware, oil it up and call it a day.
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Old 11-21-2012, 07:04 PM   #85
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did you have a issue or just pulled it apart for service? did you pressure test it before pulling the o-ring?
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Old 11-21-2012, 07:06 PM   #86
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I used a forge for 2 years no issues here either. this was a while back though, so maybe their newer stuff is sucking
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Old 11-21-2012, 07:48 PM   #87
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My old Bosch 1" valve had a very distinct chirp when run VTA. Not stealthy at all.
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Old 11-22-2012, 01:38 AM   #88
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Quote:
Originally Posted by psreynol View Post
did you have a issue or just pulled it apart for service? did you pressure test it before pulling the o-ring?
Nope no issues, functioned same as day one. I have 2 bovs, the forge and an ebay SSQV knock off. Both have different sounds so when i get bored of one, i switch over the other one.

The forge has a pssss noise while the ssqv whistles. Stock the ssqv knock off leaked like a **** however oiled up and plugged up using rtv its working great.
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Old 12-05-2012, 10:19 AM   #89
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Bumping this as its relevant to my interests.

Anyone else got any more suggestions?

Main goal: QUIETNESS, just like my NorCal bretheren.

I'm really leaning toward the Greddy Type-s, or one of its many many knockoffs. Was going to use a tial, but they are just not quiet, and I am not wrapping foam around it, so that's no longer an option. The type-s, on the various cars I've listened to it, is kinda sorta like the dog whistle someone mentioned earlier, very high pitched and deceptively quiet. Ideas?

If not I'll just use one of the bosch bpv style replicas in all aluminum
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Old 12-05-2012, 11:06 AM   #90
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Only if it's setup incorrectly. Mine is just a whoosh.



It chrips when it's done like a n00b:




Shuiend's tial is quiter, and Y8s GReddy type-R is silent; like I said earlier.
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Old 12-05-2012, 11:24 AM   #91
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Set up incorrectly as in too tight or too loose?

(can't see vids at work so I'll check them later)

I noticed the shiuend/y8s comment before and I'm surprised by the tial: the ones I heard on the internet and IRL are/were all loud. Its why I got rid of my TiAL that I loved so much. I just don't want loud.
As for the greddy type-r, they are 'spensive as hell and hard to find, so probably won't go that route.

right now its between the greddy s or one of the bosch recirc replicas in alum routed to atmo.

I know re-routed would be best, but my intake will consist of like 10" tube and filter, and not worth the hassle to plumb back into.
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Old 12-05-2012, 11:25 AM   #92
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too tizight.
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Old 12-05-2012, 01:09 PM   #93
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I'm running this old-*** huge-*** HKS unit on the MX6. It's dead quiet. Previously ran a Greddy Type S, Greddy Type S knockoff, and a Greddy RZ in that order on that car. The Type S knockoff was the loudest by far, followed by the Type S and the RZ.




On the Miata, i run a Go Fast Bits that's set on full recirculate. It's obnoxiously ear-splittingly loud. I hate it.
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Old 12-05-2012, 01:21 PM   #94
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damn it......you're crushing my dreams of having a quiet knockoff type-s :(
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Old 12-05-2012, 01:24 PM   #95
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Quote:
Originally Posted by 18psi View Post
damn it......you're crushing my dreams of having a quiet knockoff type-s :(

Yeah quiet was NOT on the menu for that thing. It may have quieted down a little bit if i tightened it, but i doubt it.

I paid $50 for my HKS bov. That would be my formal suggestion. Get your search on.



Also bear in mind that this car runs a bit more boost than most Miatas, so i'm not sure if that affects things. (Doesn't stop my Miata from being stupid loud, though. I shudder to think what that GFB would sound like venting 30psi on the MX6.)
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Old 12-05-2012, 02:00 PM   #96
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I've heard a knockoff Type-S, sounded exactly like my genuine type-s. The only difference we could spot between the two was the name plate that GReddy is etched into is blank on the rip-off.
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Old 12-05-2012, 02:21 PM   #97
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Sadly probably the same tolerances too.
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Old 12-05-2012, 02:29 PM   #98
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Probably. Mine came with the parts I bought back in 2006, I'd never spend that much on a BOV otherwise.
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Old 12-05-2012, 02:30 PM   #99
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My knockoff did sound quite different from my real one, but my real one was also old, probably purchased new around 2003. So... i suppose that data point might not be real useful.
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Old 12-05-2012, 02:39 PM   #100
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I bought an SSQ knock off. It wouldnt hold boost at first, I did some crap to it, it was bone dry so i lubed it up to hell and back, the bolting surfaces werent flat mainly because the paint they use is garbage so i sanded it down to a flat surface, and it stopped leaking. Also the holes where the bolts go were leaking so i used rtv to seal them tight.








These holes on the front are plugged with rtv not grease.


Problems with it are, it does have a rubber diaphram so it will most likely rip.
Attached Thumbnails
ITT: quiet BOVs/bypass valves-dscf0003-1.jpg   ITT: quiet BOVs/bypass valves-dscf0004.jpg   ITT: quiet BOVs/bypass valves-dscf0002-1.jpg   ITT: quiet BOVs/bypass valves-dscf0001-1.jpg   ITT: quiet BOVs/bypass valves-dscf0005-1.jpg  

ITT: quiet BOVs/bypass valves-dscf0006.jpg  
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