DIY Turbo Discussion greddy on a 1.8? homebrew kit?
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Recommend an affordable recirculating BOV?

 
Old 08-31-2018, 03:10 PM
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Default Recommend an affordable recirculating BOV?

I am currently using a knock-off BOV, and in addition to whistling at part throttle, the diaphram inside has torn. This is the second one I have had and this one only lasted a year.

I have looked at buying the real version of this valve, but they are pretty expensive. I was hoping I wouldn't have to re-weld the flange.
Does anybody have a recommendation for a BOV that would use the same flange, but that is higher quality? I don't mind paying more than that particular knock-off, but $250-$300 for a genuine Greddy is a lot. Is there a higher-quality knock-off or something?

Otherwise, what are other people using for recirculating valves? If I have to change the flange, there must be something decent at a reasonable price. I would like a relatively quiet valve, but it doesn't have to be anything super-stealth.
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Old 08-31-2018, 03:32 PM
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What boost levels?
Used genuine audi/vw valves are cheap and good for 14-15 psi.
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Old 08-31-2018, 03:50 PM
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I'm only running about 11psi right now, and don't have plans to go past 14-15 so I will definitely check that out!
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Old 08-31-2018, 10:01 PM
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The plastic ones tend to leak. I'm happy with my Forge. It is a 007, which seems to have been replaced by the 008:

$167 and re-buildable

Side entrance is high pressure. It can take lots of spring, as the vacuum will pop it open.
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Old 08-31-2018, 10:20 PM
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TurboSmart Kompact series, 32mm inlet, 20mm outlet, use 3/4" hose for the recirc. Works well.

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Old 08-31-2018, 10:48 PM
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The whistling at part throttle indicates it's leaking right?
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Old 09-01-2018, 01:32 PM
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Originally Posted by skidude View Post
I am currently using a knock-off BOV, and in addition to whistling at part throttle, the diaphram inside has torn. This is the second one I have had and this one only lasted a year.

I have looked at buying the real version of this valve, but they are pretty expensive. I was hoping I wouldn't have to re-weld the flange.
Does anybody have a recommendation for a BOV that would use the same flange, but that is higher quality? I don't mind paying more than that particular knock-off, but $250-$300 for a genuine Greddy is a lot. Is there a higher-quality knock-off or something?

Otherwise, what are other people using for recirculating valves? If I have to change the flange, there must be something decent at a reasonable price. I would like a relatively quiet valve, but it doesn't have to be anything super-stealth.
TurboSmart Kompacts have been my favorite brand recommendation. About $150-$180 for a high quality BOV. I run a universal 1" port TurboSmart BOV in my Fiesta ST, runs with 27 psi. Don't get the pure "vent to atmosphere" BOV if you want it quiet, this is my setup: Fiesta ST, VTA BOV. Notice the VTA "horn" there?

A recirculating TurboSmart has a loud "pssh" (not VTA loud) if you leave the port unplugged. If you attach a length of hose to it, it quiets down a lot. You get the ability to adjust the loudness. That is how I would do it, if I changed my BOV setup.

They have tons of adapter kits, but they are a little pricey for something you can DIY. The TurboSmart Greddy adapter is $36.58 on their website. BOV-TS-Greddy-Flange-Adapter
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Old 09-01-2018, 02:18 PM
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There is a company that makes high quality GReddy Type-s replicas. NGR. Look them up.
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Old 09-01-2018, 08:08 PM
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I'm using a $28 Bosch black plastic recirculation valve as a BOV. I've been using it at 22psi, 320whp+ including track duty for many years. It doesn't leak and hasn't failed. They only leak if they're plumbed incorrectly. The inlet from the intercooler piping is the port perpendicular to the diaphragm on the Bosch units according to their literature. Most people plumb them to allow the pressure to push the diaphragm open contrary to Bosch's design specs.

$28 is pretty affordable.
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Old 09-02-2018, 08:20 AM
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Bosch and Audi/VW are one in the same, correct?
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Old 09-02-2018, 09:04 AM
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Yes, the same one. Bosch make these for the VW brand.
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Old 09-04-2018, 11:20 AM
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Thanks for all the help guys!
Those Bosch valves are super cheap, and if I can make an adapter I can try that out without spending much. Then if it doesn't work the way I want I can go the $150ish route, where there appear to be a number of good options.
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Old 09-04-2018, 02:16 PM
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I have an authentic Greddy RS (recirculate or VTA) - $180
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Old 10-30-2018, 07:50 AM
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Originally Posted by sixshooter View Post
I'm using a $28 Bosch black plastic recirculation valve as a BOV. I've been using it at 22psi, 320whp+ including track duty for many years. It doesn't leak and hasn't failed. They only leak if they're plumbed incorrectly. The inlet from the intercooler piping is the port perpendicular to the diaphragm on the Bosch units according to their literature. Most people plumb them to allow the pressure to push the diaphragm open contrary to Bosch's design specs.

$28 is pretty affordable.
sixshooter I have been searching for these. the 710N and 710B, along with some other part numbers. Could not find new anywhere for less than $45. I do like the Forge, but seems like I have to service it about 1 / yr.

Can you point to a specific P/N and / or source?

Last edited by DNMakinson; 10-30-2018 at 07:52 AM. Reason: Added the question
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Old 10-30-2018, 08:22 AM
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This is the bosch bov I purchased off ebay.
https://www.ebay.com/itm/Audi-2-7t-0...53.m2749.l2649
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Old 10-30-2018, 10:13 AM
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Used, I understand in the $20 range. I was hoping Six had a source of new ones at good price.
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Old 10-30-2018, 10:57 AM
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I started with a knockoff GReddy from silicone intakes. I suspected it was leaking, and replaced it with a real GReddy FV. I picked up 1-2 psi at all RPM. So I'm not a fan of knockoff GReddy BOV's.
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Old 10-30-2018, 01:03 PM
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Mine was used. I don't recall the origin car because it has been functioning properly in my car for so many years. I'm sure there's a p/n on it somewhere.
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Old 10-30-2018, 03:52 PM
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Thanks. No worries. That is all I needed.
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Old 10-30-2018, 04:00 PM
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Cheap replacement one for $16 if you dare:

https://m.eeuroparts.com/Parts/39535...SABEgJR1vD_BwE
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