Apexofthevortex Posted December 3, 2015 Share Posted December 3, 2015 I did take a video when I first got it installed, I'll check to see if you can hear the mach 2 in the video. My mach 2 is sitting in my garage shoot me a PM if you want it MKE. Link to comment Share on other sites More sharing options...
LGTMKE Posted December 3, 2015 Share Posted December 3, 2015 (edited) I was going to send you a PM asking for a sound clip but I think a lot of other people here would also like to hear it haha. Edited December 3, 2015 by LGTMKE Link to comment Share on other sites More sharing options...
LGTMKE Posted December 3, 2015 Share Posted December 3, 2015 (edited) **Just FYI to anyone who doesn't already know** Our stock peak boost levels are between 8 and 12 psi depending on what gear we're in. This video [link below] shows that even at 8 psi our stock BPV is already leaking. Not the biggest deal if your car is stock, but Cobb stage 1 boost targets are 15 psi for 91 octane fuel and 17psi for 93 octane fuel. At 15 psi our stock BPV is leaking like a sieve, as seen around 1:15 onwards in the video. What this means is that our turbo has to work that much harder to maintain the same pressure leading to higher temperatures, premature turbo life and other nasty business some of the more knowledgeable people could explain.   Edited December 3, 2015 by LGTMKE Link to comment Share on other sites More sharing options...
brandon.mol Posted December 3, 2015 Share Posted December 3, 2015 Fun fact regarding replacing the stock BPV: It used to be that in the winter time, when colder than about -10C, I couldn't reach more than about 13 psi even at 93-octane stage 1. With the Mach2.. no problem. Its target boost at part throttle, easy. Also, the BPV seems to get louder as the temps drop, for whatever reason. Good shit. Link to comment Share on other sites More sharing options...
Unsp0kn Posted December 3, 2015 Share Posted December 3, 2015 Fun fact regarding replacing the stock BPV: It used to be that in the winter time, when colder than about -10C, I couldn't reach more than about 13 psi even at 93-octane stage 1. With the Mach2.. no problem. Its target boost at part throttle, easy. Also, the BPV seems to get louder as the temps drop, for whatever reason. Good shit. I noticed this too, I get a nice report when shifting now. McLovin' it. Link to comment Share on other sites More sharing options...
brandon.mol Posted December 3, 2015 Share Posted December 3, 2015 McLovin' it.  Well said. Link to comment Share on other sites More sharing options...
Zee199969 Posted February 4, 2016 Share Posted February 4, 2016 I've also noticed more sound coming from the GFB Mach2 BPV. I have the preload cranked all the way in and there's a nice hiss when shifting My "Build" Link to comment Share on other sites More sharing options...
Perscitus Posted May 21, 2016 Share Posted May 21, 2016 GFB Mach2 is great, works perfect on 2015+ WRX too. Link to comment Share on other sites More sharing options...
wraedeohed Posted May 24, 2016 Share Posted May 24, 2016 Will a BPV result in less turbo lag? Link to comment Share on other sites More sharing options...
BBPeik Posted May 24, 2016 Share Posted May 24, 2016 Given that we have a stock BPV there is not much difference by upgrading. The main benefit is that the stock one can leak boost. An aftermarket one is a much needed upgrade as soon as you start pushing past stock boost levels. Heck it is even a good idea at stock levels. Once you get the factory one out you will see how cheap it appears to be. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
superjoshism Posted May 24, 2016 Share Posted May 24, 2016 Given that we have a stock BPV there is not much difference by upgrading. The main benefit is that the stock one can leak boost. An aftermarket one is a much needed upgrade as soon as you start pushing past stock boost levels. Heck it is even a good idea at stock levels. Once you get the factory one out you will see how cheap it appears to be. This. GFB claims that their BPV's help slightly reduce turbo lag because of their TMS system which essentially leaves a few psi in the intake tract. I have a GFB T9033 and it's a definite improvement over stock, but since my stock was leaking anyway I can't really attribute my better response to the BPV. Link to comment Share on other sites More sharing options...
brandon.mol Posted May 24, 2016 Share Posted May 24, 2016 (edited) Will a BPV result in less turbo lag? No. Our oem unit is a manifold referenced bpv, and not one of those old fashioned pop off valves that would dump all boost relative to atmosphere. Same thing. The difference is that aftermarket units can hold much much much higher boost levels without leaking or failing entirely. Also they make fun sounds. Edited May 24, 2016 by brandon.mol Link to comment Share on other sites More sharing options...
Waxball88 Posted May 24, 2016 Share Posted May 24, 2016 I don't buy that a BPV will reduce turbo lag as the pressure it will offer pre-turbo is negligible. But they are still a good idea to upgrade Link to comment Share on other sites More sharing options...
brandon.mol Posted May 24, 2016 Share Posted May 24, 2016 On old Toyota turbo motors it mattered a lot, iirc. I seem to recall my buddy's '90 poopra benefiting substantially from a BOV in that regard. Link to comment Share on other sites More sharing options...
wraedeohed Posted July 12, 2016 Share Posted July 12, 2016 Brandon, does the GFB directly replace the stock BOV without an modifications? Link to comment Share on other sites More sharing options...
Zee199969 Posted July 12, 2016 Share Posted July 12, 2016 Brandon, does the GFB directly replace the stock BOV without an modifications? it bolts up in the stock location with no need to modify anything My "Build" Link to comment Share on other sites More sharing options...
Sarang Posted July 12, 2016 Share Posted July 12, 2016 Brandon, does the GFB directly replace the stock BOV without an modifications? Yes. Source: I have one installed. Link to comment Share on other sites More sharing options...
GTEASER Posted July 14, 2016 Author Share Posted July 14, 2016 Those of you with the GFB Mach2 diverter valve (full recirc)....Where do you have your preload adjustment set to? I just put one on the Fozz and the instructions say to start with the screw all the way in on full preload and listen for compressor surge (flutter). I didn't hear any although I don't really know what it sounds like. Am I good? GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
Zee199969 Posted July 14, 2016 Share Posted July 14, 2016 I have mine one full turn from being cranked all the way in. i get a nice hiss depending on how hard i push the car. IIRC some had the preload even looser, but I think it doesnt affect performance? The BPV is supposed to open at the same psi regardless of the preload, I think My "Build" Link to comment Share on other sites More sharing options...
Sarang Posted July 15, 2016 Share Posted July 15, 2016 Same: one turn from the stiffest setting. I can hear it a little when I shift or let off the gas in boost, but it is pretty subtle. Enough that I enjoy it but my wife doesn't notice. Link to comment Share on other sites More sharing options...
GTEASER Posted July 15, 2016 Author Share Posted July 15, 2016 Thanks guys, one turn from full preload it is then!!! GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
wraedeohed Posted July 26, 2016 Share Posted July 26, 2016 (edited) Ok.....I'm just going to deal with having a noob moment, but is the stock location on our car (2012) not on the top near the intercooler? Is it down by the turbo? I was going to put my Mach 2 in during my lunch break, but could not locate the stock BOV. I have the GFB Mach 2 (T9133) Edited July 26, 2016 by wraedeohed Link to comment Share on other sites More sharing options...
Ellesedil Posted July 26, 2016 Share Posted July 26, 2016 Ok.....I'm just going to deal with having a noob moment, but is the stock location on our card (2012) not on the top near the intercooler? Is it down by the turbo? I was going to put my Mach 2 in during my lunch break, but could not locate the stock BOV. I have the GFB Mach 2 (T9133) Yes, it is pretty close to the turbo. Link to comment Share on other sites More sharing options...
GTEASER Posted July 26, 2016 Author Share Posted July 26, 2016 It's not an easy job, definitely not a lunch time affair like the BPV was on my 2009 FXT. You probably have to get the front up in the air and get it from underneath. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
BBPeik Posted July 26, 2016 Share Posted July 26, 2016 If you pull the passenger side fan it is pretty easy to get to. Not a lunchtime thing if you have never done it, but it is not that bad. It is right at the turbo on the charge pipe. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
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