Tehnation Posted January 27, 2022 Share Posted January 27, 2022 I need a new one, aftermarket. Any recommendations? Something that bolts onto our stock location, and is recirculating? I asked my tuner and he was like of course you should change it, oem is only good for a certain amount of boost then it starts leaking. Link to comment Share on other sites More sharing options...
Infosecdad Posted January 27, 2022 Share Posted January 27, 2022 I have one of these and I love it. http://synapseengineering.com/synapseusa/compressor-bypass-valves/synchronic-diverter-valve-and-kits/subaru-wrx-2008-2014-synchronic-dv-kit.html I tried OEM, TurboXS, and GFB, this is my favorite by far. Recommend reading up about them. Link to comment Share on other sites More sharing options...
Tehnation Posted January 27, 2022 Author Share Posted January 27, 2022 Will look into it! This perrin one had already caught my eye. https://www.perrin.com/shop/turbo-accessories/subaru-recirculating-bov Link to comment Share on other sites More sharing options...
JoeInOregon Posted January 27, 2022 Share Posted January 27, 2022 I really liked the AVO, it had a small plate on the back you could remove for a little more noise but not enough air to mess things up. Help body well (stage 1) Seemed to act quickly and was a noticable improvement from stock Sent from my Pixel 3a using Tapatalk Link to comment Share on other sites More sharing options...
whitexc Posted January 27, 2022 Share Posted January 27, 2022 Those from Synapse are spendy and very nice. They look to be built well. Sent from my SM-G996U using Tapatalk Link to comment Share on other sites More sharing options...
cheeseenlo Posted January 27, 2022 Share Posted January 27, 2022 Previously had GFB and my tuner said to get rid of it. Anything with adjustable recirculate vs to atmosphere has a potential chance to leak. I didn't take a chance and went with a new Cobb LF Bypass unit. No issues, still makes whoosh whoosh noises if you're into that on cold days. Link to comment Share on other sites More sharing options...
DoctorDaveLGT Posted January 27, 2022 Share Posted January 27, 2022 Turbosmart Kompact is what I've been running on mine and love it. Full re-circ, I previously had a GFB adj one. Although I have had my eye on that synapse that Infosecdad posted. Actually reminded me that I need to buy it before I get the car tuned. https://www.evasivemotorsports.com/store/product/turbosmart-kompact-plumb-back-blow-off-valve-subaru-wrx-08-14-forester-xt-08-12-legacy-gt-03-08/ Link to comment Share on other sites More sharing options...
Tehnation Posted January 28, 2022 Author Share Posted January 28, 2022 (edited) So far Cobb LF BPV - $325 Perrin Recirculating BOV - $220 Synapse Engineering Synchronic DV Kit - $283 Turbosmart Kompact - $166 And AVO makes 2 for our cars, not sure whats going on there. AVO Turbo Blow-Off Valve Silver/Polished - 08+ WRX / 05-09 Legacy GT & Outback XT / 09+ Forester XT - $250 https://www.importimageracing.com/collections/blow-off-valves/products/avo-turbo-blow-off-valve-silver-polished-08-wrx-05-09-legacy-gt-outback-xt-09-forester-xt-s1x99900c001j AVO Black Blow Off Valve WRX 2002-2007 / STI 2004-2021 / Forester XT 2006-2008 - $300 https://www.importimageracing.com/collections/blow-off-valves/products/s2a01900bblkj-avo-black-blow-off-valve-wrx-2002-2007-sti-2004-2021-forester-xt-2006-2008 Edited January 28, 2022 by Tehnation Link to comment Share on other sites More sharing options...
Tehnation Posted January 28, 2022 Author Share Posted January 28, 2022 (edited) Never heard of synapse engineering, when did they hit the scene? I'm sorta going between the cobb, perrin and synapse atm. Can never go wrong with Cobb parts, the perrin is a nice price and has all the bells and whistles, and the synapse seems to be popular. https://www.cobbtuning.com/newly-designed-cobb-lf-bypass-valve/ https://www.perrin.com/shop/turbo-accessories/subaru-recirculating-bov http://synapseengineering.com/synapseusa/compressor-bypass-valves/synchronic-diverter-valve-and-kits/subaru-wrx-2008-2014-synchronic-dv-kit.html On another note, what does a leaking bpv feel like? What exactly does upgrading it do or feel like? What should i expect exactly? Edited January 28, 2022 by Tehnation Link to comment Share on other sites More sharing options...
whitexc Posted January 28, 2022 Share Posted January 28, 2022 Following Sent from my SM-G996U using Tapatalk Link to comment Share on other sites More sharing options...
Tehnation Posted January 28, 2022 Author Share Posted January 28, 2022 (edited) I ask because my boost and vacuum doesn't seem consistent, and everything else in terms of upgradable has been turbo/boost wise, the turbo, IC and EBCS, so all that's left that can be unstable is the oem bpv. I have a bnr billet 20g turbo, not sure if that turbo warrants a better bpv.... but I also have BC stage 3 cams, so everything is a bit different and new for me. I am assuming the bpv is a possible oversight lol. I guess a better question is what are the symptoms of a failing bpv? Edited January 28, 2022 by Tehnation Link to comment Share on other sites More sharing options...
rhino6303 Posted January 28, 2022 Share Posted January 28, 2022 You could also go with a forge bpv. Link to comment Share on other sites More sharing options...
shralp Posted January 28, 2022 Share Posted January 28, 2022 Ran the original OEM one in my track car for 15yrs until 2020. Was rock solid in my experience, couldn’t get my tuner to get it to leak on the dyno each time I had the car tuned over the years. Finally swapped out to the Cobb unit not because anything was wrong with it, but I just needed something to do with my stimulus money . Ive been happy with the Cobb in that the install was painless and it has also worked flawlessly. The Synapse ones look killer as in, artfully designed, but I just went with a known quantity because I have a long history with the brand. Still original OEM in my daily, don’t see any reason to swap it out. Link to comment Share on other sites More sharing options...
Tehnation Posted January 28, 2022 Author Share Posted January 28, 2022 Not sure how much more air a 20g versus a 16g/vf52 is putting out. What turbo are you running? Link to comment Share on other sites More sharing options...
Pleides Posted January 28, 2022 Share Posted January 28, 2022 I just called Surgeline about this and for my VF52 they didn't recommend an aftermarket BPV unless something was wrong with mine. For a larger turbo, yes, it's not a bad idea to get a nice one. They recommended me the Cobb one. Link to comment Share on other sites More sharing options...
Tehnation Posted January 30, 2022 Author Share Posted January 30, 2022 (edited) I think anything over oem level boost may warrant a better bpv. The 20g is putting out more air than a vf52 from what I have researched. The VF52 is like the best oem turbo which that bov is probably designed to handle. Anything more and you might get issues. I am now trying to decide between the cobb and synapse. Anyone see any big things that stand out between the two? What are pros and cons of each? Cobb is full bpv it looks like, what about the synapse? Edited January 30, 2022 by Tehnation Link to comment Share on other sites More sharing options...
shralp Posted January 30, 2022 Share Posted January 30, 2022 I think anything over oem level boost may warrant a better bpv. The 20g is putting out more air than a vf52 from what I have researched. The VF52 is like the best oem turbo which that bov is probably designed to handle. Anything more and you might get issues. I am now trying to decide between the cobb and synapse. Anyone see any big things that stand out between the two? What are pros and cons of each? Cobb is full bpv it looks like, what about the synapse? I think the main thing that tips the scales for me in favor of the Cobb is the multi piece design of the Synapse. Looks to be multiple parts to put it together. It looks well built but there’s a lot more to leak there seems like. The Cobb is one piece unit so it would seem that maybe there is less to fail? Link to comment Share on other sites More sharing options...
Tehnation Posted January 30, 2022 Author Share Posted January 30, 2022 I was thinking the same thing the synapse looks like its made for multiple applications based on the parts you get, while the cobb is designed for a specific application. There isn't much literature on the synapse website about the part so its a bit of a turn off imo. What is port a and port b? At the end of the day I want all performance, and the car is designed to run that wasted pressure back into the system, which seems like an obvious no brainer from an engineering pov. Noise vs wasted energy??? I don't need a bov, the Cobb seems the best buy, lots of literature and like shralp said a lot less places for problems. I like a company that can actually explain what their product is doing. Link to comment Share on other sites More sharing options...
Infosecdad Posted January 30, 2022 Share Posted January 30, 2022 Here are some of the resources I used when I decided to go with the Syncronic DV. I agree, they aren't that great at marketing it, but I love the engineering behind it. https://forums.nasioc.com/forums/showthread.php?t=1289999 http://www.synapseengineering.com/support/faq/pdf/DV_manual_webres.pdf https://www.evoxforums.com/threads/push-vs-pull-and-a-b-a-b-port-options-on-synapse-synchronic-dv.64573/ https://www.youtube.com/channel/UCphpsjXC4U94Co41lylVztQ I would suspect the Cobb is easier (not really any configurations, just go), but I liked the engineering behind the Synchronic DV so I decided to try them. Link to comment Share on other sites More sharing options...
k00laid83 Posted February 2, 2022 Share Posted February 2, 2022 So far Cobb LF BPV - $325 Perrin Recirculating BOV - $220 Synapse Engineering Synchronic DV Kit - $283 Turbosmart Kompact - $166 And AVO makes 2 for our cars, not sure whats going on there. AVO Turbo Blow-Off Valve Silver/Polished - 08+ WRX / 05-09 Legacy GT & Outback XT / 09+ Forester XT - $250 https://www.importimageracing.com/collections/blow-off-valves/products/avo-turbo-blow-off-valve-silver-polished-08-wrx-05-09-legacy-gt-outback-xt-09-forester-xt-s1x99900c001j AVO Black Blow Off Valve WRX 2002-2007 / STI 2004-2021 / Forester XT 2006-2008 - $300 https://www.importimageracing.com/collections/blow-off-valves/products/s2a01900bblkj-avo-black-blow-off-valve-wrx-2002-2007-sti-2004-2021-forester-xt-2006-2008 I have the Turbosmart Kompact and she's been good so far on breaking in my engine. She actually reminds me of my Tial bov in my s13. No need to adjust it, you just run a vacuum to it and she's ready to go. I personally think it's a great upgrade over the stock plastic one. Especially for the price you can't beat it. Link to comment Share on other sites More sharing options...
Code Posted February 2, 2022 Share Posted February 2, 2022 Cobb LF all day long. It’s been tested to presssures way above what you’ll ever see. It’s small and quick to vent, which is key. You want to release the pressure as quickly as possible in order to prevent compressor surge. If you want something that has the option to vent - I have an original Cobb Xle on my shelf and I’ll sell it for $125 shipped. "Striving to better, oft we mar what's well." - Bill Shakespeare - car modder Link to comment Share on other sites More sharing options...
Tehnation Posted February 4, 2022 Author Share Posted February 4, 2022 I contacted Grimmspeed, cause I got a grimmspeed ic, and they recommend the perrin actually. They also hinted at grimmspeed coming out with a bpv within the next month or so and I love me some grimmspeed products! There reply "Thanks for reaching out! I would recommend PERRIN. Otherwise, I would also stay tuned within the next month or so for GrimmSpeed. It would make sense for us to release one to go with our TMIC/FMIC Kits" Link to comment Share on other sites More sharing options...
ashwinearl Posted March 7, 2022 Share Posted March 7, 2022 if replacing a stock one, and planning on full recirculation, is a tune necessary? I'm sure it's always recommended, but in case of replacement of OEM with same functionality is it required. The one issue with the Synapse I was concerned about is fitment with an aftermarket Grimspeed Intercooler. I like the engineering and fun noise of the Synapse. What are people using with a Grimspeed Intercooler? Link to comment Share on other sites More sharing options...
Infosecdad Posted March 7, 2022 Share Posted March 7, 2022 I’m using the Synapse with the Grimmspeed TMIC. It’s a close fit, but part of that is I have a radium FPR and sensor that takes up more room next to it than stock. I can find a picture when I get back to my computer later. Link to comment Share on other sites More sharing options...
shralp Posted March 8, 2022 Share Posted March 8, 2022 Cobb LF on my Grimmspeed Link to comment Share on other sites More sharing options...
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