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Old 03-09-2011, 03:17 PM   #26
sport6
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Wow I wish I did some research before selling my Forge that I had on my speed3 before buying this car.... could have saved myself some money!

Another note I think that stock BPV is the same one that the speed3/6/CX-7 uses.
Here is the stock one from my Speed3:
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Old 03-09-2011, 03:24 PM   #27
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Also if the Mazdaspeed3 Forge valve fits then this one will too:

It's Forge's other valve for the Speed's because people complained about the Mario Coin/Swords Clashing noise.

Part: FMDVMAZ3S
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Old 03-09-2011, 03:47 PM   #28
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Quote:
Originally Posted by sport6 View Post
Wow I wish I did some research before selling my Forge that I had on my speed3 before buying this car.... could have saved myself some money!

Another note I think that stock BPV is the same one that the speed3/6/CX-7 uses.
Here is the stock one from my Speed3:
http://farm4.static.flickr.com/3330/...44bfeba5_o.jpg
Interesting. Must be some generic part being sold in Japan. The older (metal) BPV's on Subaru's were the same as seen on other brands as well. Does this mean the newer Mazda's also have a diamond shaped hole for the BPV to mount to? Because that would mean the "Mazda" valves from Forge wouldn't even work on Mazda's! But it would be easy for the diamond shaped BPV seal to still be used with a round hole.

Quote:
Originally Posted by sport6 View Post
Also if the Mazdaspeed3 Forge valve fits then this one will too:

It's Forge's other valve for the Speed's because people complained about the Mario Coin/Swords Clashing noise.
http://www.forgemotorsport.co.uk/ima.../FMDVMAZ3S.jpg
Part: FMDVMAZ3S
Any photos out there of this valve opened up? I think this is essentially flipping the side and bottom ports on the Forge valve I have. I would note that the Mazda flange will not bolt up to the newer WRX TMIC. That was half of the point of this post. So the one you just linked to would mount, but would require work to make it seal. It looks like the connection for the line going back to the intake is in about the right spot, so it might actually work. You would definitely need a longer vacuum hose to reach the nipple on the top of this valve.

Now that you mention the sword noise, I am curious how many people get this? I've heard that it happens all the time with the Forge valves, and I've seen videos of it on YouTube. But so far I've had 2 Forge valves and neither made clanking noises. At one point I did hear some type of metallic sound for a day or two, but it wasn't loud and hasn't been back since. Right now mine does not make any sword noises at all. None. Just wooshing of air.
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Old 03-09-2011, 03:58 PM   #29
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I did some searching and found photos of the V2 BPV for the Mazda:

http://www.mcx7.com/showthread.php?7...on-2%29-Review

It is indeed a flipped version of the V1 (and the WRX version). I really don't see why it would make any less sound unless the surface areas are just changed enough to slow the valve down so that it doesn't smack against the end of the housing (and make the ping). It does seem like this valve would open with less force, and close more easily. Good for holding boost, good for reducing ping noises, maybe not so good for reducing flutter. Either way it is interesting, but the flange it is being sold with would require additional work to seal on the stock WRX TMIC (and the hose connections may or may not line up well enough for an easy install).
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Old 03-09-2011, 04:29 PM   #30
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The stock cold pipe on the speed3 has a round hole for the BPV.. I guess I didn't read or comprehend that that was what you were saying in here..

You can see it here:

Also the noise thing I think depends on the recirculation tube for the Speeds. Because when I installed my FMIC on my speed3 it required a 90* tube instead of the straight tube and it completely changed the sound to one that is like the HKS valves. No more clashing.
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Old 03-15-2011, 07:40 AM   #31
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Interesting that the piping makes a difference. I've definitely never had the "ping" noise with either of the Forge valves I've had. Maybe that is just due to the recirculation hose design on the newer WRX's. I'm not sure how it differs from the older models.

I have been playing around and found that the Forge BPV is wide open at idle, but snaps shut the instant you open the throttle. The spring is not needed at all to hold the valve closed (the boost does that). The spring is only needed to give the piston a slight nudge and make sure it doesn't stick open.

I also picked up a spare OEM valve, so I might try doing the $0.16 mod (block off the lower diaphragm hole) and compare that to the Forge. I'll probably throw the unmodified stock valve back on their for additional comparison as well. Once I figure out a way to mount a camera in the car I'll try to get some driving footage.
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Old 03-23-2011, 09:50 AM   #32
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Just picked up a new Forge valve and was seeking advice on what spring to run. I'm targeting 21psi, so I'm currently running the blue spring. I don't have any idling issues, but I can hear the valve open even when I'm not boosting (i.e. low rpm shifts still under vacuum). Was curious if this is normal and if I should try using a different spring?
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Old 03-23-2011, 11:02 AM   #33
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I found that the heavier spring, the more "flutter" I would hear. I found the Yellow spring to work best. I am running about 21.5psi and it seems to open nice and quickly. I recently just got the Green spring (even lighter than the Yellow), and put it in. Seems to be working great, but I only put it in yesterday, so I'm going to try it for a little while longer.

FYI, the strength of the spring should have nothing to do with the amount of boost it can hold. The valve is held shut be boost pressure, so the more boost you run, the more tightly it will close (regardless of spring).
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Old 03-23-2011, 12:22 PM   #34
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Directly from Forge:

Quote:
Valve Spring color coding

Green - 5-15 PSI

Yellow - 15-23 PSI

Blue - 23-30 PSI

Red - 30 + PSI

The above figures are estimates only and should only be considered as a guideline

Please note - fitting a stronger spring into a valve will not increase boost pressure unless existing pressure is being lost. Failure to allow the valve to operate by installing a spring which is too strong may cause damage to the turbocharger.
The fluttering that you're hearing is likely compressor surge. If you're on pump gas with no meth, then the yellow spring is what you want.
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Old 03-23-2011, 12:41 PM   #35
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I've seen those recommendations, and I'm not sure why they suggest heavier springs for more boost. I have confirmed that none of the springs hold the BPV closed at idle, and that pressure bias alone can keep the valve closed and sealed at full boost. Some valve companies spec springs based on vacuum. I believe this makes a lot more sense if the valve needs to be closed at idle (like a blow off valve), but in the case of the Forge BPV, it is open at idle so it doesn't really matter.

I have personally tried everything from no spring at all to a red spring and 4 shims (in the Forge BPV). They all are open at idle, and they are all closed at full boost. The only issue with no spring was that the valve would often "stick" open and boost would not build up until it closed. I believe the spring helps to bias it closed during transient periods (ie. going from vacuum to boost). The heavier springs just resulted in more and more flutter.
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Old 03-23-2011, 12:57 PM   #36
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Quote:
Originally Posted by SWP n Gold View Post
Directly from Forge:



I'm assuming they're talking about compressor surge when they say "damage to the turbo". The fluttering that you're likely hearing is compressor surge. If you're on pump gas with no meth, then the yellow spring is what you want.
I've said it before and I'll go on the record here again... that "fluttering" is more the sound of the undampened action of the BPV's valve than it is "compressor surge."

Because in my mental models this was most likely, I recently modified my BPV with the $0.16 BPV Mod in mind... but made the new vent different as well as covering it with filtering material. I made the hole only 1/16", big enough to do the job, but small enough to present a resistance to the BPV's diaphragm movement. Without this dampening resistance, like a wheel without a shock, the BPV "flutters" as it goes about venting.

Analyzing the so-called flutter issue I purposefully found situations where I could test my belief... finding relatively steep inclines (plenty here) where boost would build BUT where I was not going to shut the throttle. Under proper street driving, circumstances occurred where the throttle was open, but was slightly modulated as boost was accounted for... and the BPV would flutter quietly. First, my little air vent does mollify the flutter, whatever fluttering does happen is quieter and less frequent. BUT... the fact the fluttering takes place at low boost with the throttle open to an engine under load proves TO ME that the noises a harder-sprung BPV causes is the valve and NOT the turbo... or, at a minimum, is some benign interaction between the two. Think about it.

That the stock TMIC is small and holds only a small compressed charge in and of itself decreases whatever pressure surge the turbo is going to see. Maybe on a FMIC, with all that volume and flimsy piping. Still, too many cases of professionals running with no BOV/BPV, not to mention all those yesteryear cars, for me to fret over a good BPV with a strong spring.

Of course, if people quit worrying about the COMPRESSOR SURGE the ol' faithful $0.16 BPV Mod causes, Forge and others' sales would suffer... because it really does work, it is cheap, and it ain't gonna kill your turbo.

Last edited by SeeeeeYa; 03-23-2011 at 03:10 PM.
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Old 09-27-2012, 10:44 AM   #37
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xluben you still running this? hows it been treating you?? another question what gasket did you use for the new forge valve you received?? (diamond bottom wrx specific)
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Old 09-27-2012, 11:55 AM   #38
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I've tried many different valves. Both version of the Forge, GoFastBits 50/50, TurboXS 50/50, TurboSmart Kompact, and I now have the TurboSmart Dual Port 50/50. For the price, I would definitely get the Forge. It will work great for just about anyone. I used the stock diamond gasket in the Forge valve.
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Old 09-27-2012, 12:24 PM   #39
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yeah i had the turbo x's hybrid on for 4 days and backfired somuch. and was so weary about it not being recirc. so now im alil more sure about the forge, my bpv after installing it back on after the turbox's starts wooshin almost like a leak. im hitting full boost but i think my stock is going
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Old 09-27-2012, 12:26 PM   #40
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Sounds like the Forge is the right choice for you.
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Old 09-27-2012, 12:52 PM   #41
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Which vendors are selling the Forge BPVs now? I really want a black one, but I'm not convinced the vendor is stocking the correct one (ie the one with the diamond OEM gasket).
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Old 09-27-2012, 01:23 PM   #42
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I think RallySportDirect stopped carrying Forge for some reason, so I'm not sure who to recommend. I think ImportImage carries it, but I don't really trust their site for getting the right one. At the very least I would check that the model number is correct in the listing.
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Old 09-27-2012, 01:38 PM   #43
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Get it off the forums. I bought a black one with diamond gasket for $100 shipped, all I had to do was clean out the old grease and relube it with some red mobile grease.
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Old 09-27-2012, 02:09 PM   #44
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also got mine on here 110$ shipped not bad. now can anyone help me how to regrease? grease up the inside where the spring goes?
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Old 09-27-2012, 02:13 PM   #45
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Quote:
Originally Posted by MaddMax
Which vendors are selling the Forge BPVs now? I really want a black one, but I'm not convinced the vendor is stocking the correct one (ie the one with the diamond OEM gasket).
I just called Import Image and got exactly the one I asked for.
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Old 09-27-2012, 02:39 PM   #46
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Quote:
Originally Posted by rosedaleny806 View Post
also got mine on here 110$ shipped not bad. now can anyone help me how to regrease? grease up the inside where the spring goes?
Clean it all and then lube the o-rings.
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Old 09-27-2012, 03:21 PM   #47
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Josh needs to update his stock pic, he even mentioned it to me in chat while I was on his site.

You listening Josh?!?!?

And for reference if anyone has any questions:
http://forums.nasioc.com/forums/show....php?t=2392043
Quote:
To answer my own question, the PN is for sure: FMWRX3

Ben has even more pics of the old vs new over on 3GWRX http://www.3gwrx.com/forum/index.php?topic=18550.0
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Old 09-27-2012, 04:00 PM   #48
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I actually still have a black one with the diamond gasket. Maybe I'll take some photos of it sometime.
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Old 10-13-2012, 04:01 PM   #49
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does this come it with any springs preinstalled? after reading this thread looks like i want to have the yellow one in
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Old 10-13-2012, 07:28 PM   #50
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Thanks for the writeup Ben, appreciate the information.
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