Cobb vs. Forge vs. HKS vs TurboXs
- Thread starter HmG_mS3
- Start date
Lots of threads and a full BPV sticky on all of this. Might want to check them out first?
BTW: Best performance is the very advanced and sophistocated dual diaphragm bpv - it's made by Mazda and comes OEM on your car. It holds boost way better than the maximum boost of the K04 turbo, it releases and recovers very smoothly, does not require any maintenance or adjustment, is extremely mod friendly and best of all - its totally free and lets you spend your money on mods that actually improve performance. Grass Roots Magazine compared the stock BPV with the Forge and found that the stock valve actually held almost two full psi higher boost under full load in the higher gears.
If it's a louder sound you are looking for, then you should know that it has a very nice and very noticable release sound when matched with an aftermarket intake.
BTW: Best performance is the very advanced and sophistocated dual diaphragm bpv - it's made by Mazda and comes OEM on your car. It holds boost way better than the maximum boost of the K04 turbo, it releases and recovers very smoothly, does not require any maintenance or adjustment, is extremely mod friendly and best of all - its totally free and lets you spend your money on mods that actually improve performance. Grass Roots Magazine compared the stock BPV with the Forge and found that the stock valve actually held almost two full psi higher boost under full load in the higher gears.
If it's a louder sound you are looking for, then you should know that it has a very nice and very noticable release sound when matched with an aftermarket intake.
Personally I think the best bang for your money is the turbosmart Dual port, I had that the longest and if I had a chance later I will buy another from turbosmart...so easy to adjust and sounds OOOH so sweet even in full recirc....
between the 2 BPV, Forge BPV v1. is the best in my opinion...not fond of v2 cuz of design and makes almost no sound.
COBB, TurboXs, Greddy, they are all old school with secondary adjustment screws, major PITA to get right.
HKS makes a awesome BOV just because of the sound and performance from a pull type is best cuz you don't have to adjust anything it does it by itself regardless of PSI. However once you put it in recirc it sounds like a dead moose trying to hump a trumpet major draw back.
JUST MY 2 cents
between the 2 BPV, Forge BPV v1. is the best in my opinion...not fond of v2 cuz of design and makes almost no sound.
COBB, TurboXs, Greddy, they are all old school with secondary adjustment screws, major PITA to get right.
HKS makes a awesome BOV just because of the sound and performance from a pull type is best cuz you don't have to adjust anything it does it by itself regardless of PSI. However once you put it in recirc it sounds like a dead moose trying to hump a trumpet major draw back.
JUST MY 2 cents
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yes, with any aftermarket intake you will hear swoosh sound and if you replace your OEM stock TIP with aftermarket you will hear the swoosh even louder.
Yes. Absolutely. You need an aftermarket intake anyway. The stock intake is incredibly restrictive. Any good short ram intake (SRI) or cold air intake (CAI) will produce anywhere from 15-20 wheel horsepower gain. I kid you not. This has been dyno proven over and over again. Aftermarket intake is the single most cost-effective power builder you can have on this car, and it forms the basis for all power mods you may consider adding later.
Once you have that intake on the car, believe me, the stock bpv will be very noticable. With my Mazdaspeed CAI, the filter is only one inch in front of the ambient air slots in the left front fender well, right in front of your driver's side door. You'll hear it. You'll REALLY hear it. You'll hear it so well, if the filter is located there, that you may want something quieter. And when I had my CAI in SRI mode it was almost as loud. Try this first. You need the intake anyway. Then if you want some other sound, that's up to you. But unless you can prove with a boost gauge that the stock bpv is not holding your target boost, you will not gain any power by making a bpv change. And, please, whatever you do, run your bpv in full 100% recirc if you want optimum performance.
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Check synapse out, I love mine, they just release a new one thats smaller. Great whoosh sound. http://synapseengineering.pinnaclecart.com/catalog/Synchronic_Diverter_Valves-16-1.html
MSMS3 - I dyno 260 to the wheels with a new BPV and a COBB SRI, explain that? My valve responds much quicker than the stock one did and i believe it holds boost better.
MSMS3 - I dyno 260 to the wheels with a new BPV and a COBB SRI, explain that? My valve responds much quicker than the stock one did and i believe it holds boost better.
okay so i guess that will be my first thing and try it out before i buy an aftermarket bpv...
so i don't wanna register to this site so how much is this thing??
so i don't wanna register to this site so how much is this thing??
frodaddyweez
Member
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- 2009 Mazdaspeed3
I agree with MSMS3, the stock BPV sound is very noticeable when you install an intake, especially an SRI like the COBB one I have. You'll gain more power than an aftermarket BPV alone and you'll get a taste of the "sneeze" sound. Plus you get the added bonus of hearing your turbo spool, both of which I can never grow tired of hearing.
You probably wont notice much, if any, performance gains by getting an aftermarket BPV. The factory BPV holds enough pressure for the stock tune on the K04. The only way you'll know for sure you'll gain any power is if you're factory one is leaking. Only way you can tell for sure is to get something to monitor you car's vitals, i.e. Dashhawk, AccessPort, etc. Sometimes it messes with your LTFTs and you get some nasty backfires, like I did with my Turbosmart BPV ($175). I was installing/uninstalling it constantly when I was adding new bolt ons bc of it. And you can only get rid of that by tuning it out.
It all depends on how far you want to mod your car I guess.
You probably wont notice much, if any, performance gains by getting an aftermarket BPV. The factory BPV holds enough pressure for the stock tune on the K04. The only way you'll know for sure you'll gain any power is if you're factory one is leaking. Only way you can tell for sure is to get something to monitor you car's vitals, i.e. Dashhawk, AccessPort, etc. Sometimes it messes with your LTFTs and you get some nasty backfires, like I did with my Turbosmart BPV ($175). I was installing/uninstalling it constantly when I was adding new bolt ons bc of it. And you can only get rid of that by tuning it out.
It all depends on how far you want to mod your car I guess.
Well, did you dyno before and after to see what the actual change was? Grassroots Motorsports objectively tested the stock MS3 bpv against a 1st gen Forge. In third gear and higher (you probably dynoed in 4th?) the stock bpv consistently held about 1.5 to 2 psi higher boost than the forge.
I'm holding a steady 19-20 psi with the stock valve on HT tune with catless dp/rp. Do you have any real time performance data such as quarter mile, 60-100 mph times, accelerometer runs, etc. that would show what your actual real world out on the street performance is? Dyno data changes so much on the same machine, same operator, sometimes on the same day. And, again, since you are not shifting during a dyno run and it is usually up in 4th gear, there should be NO difference between changes in valves unless one of them is leaking.
Attached below is an actual out on the highway accelerometer data log. This is on stock bpv. You can compare this with just about any published chart in the car magazines for their tests on other cars. I just can't make the stock valve leak and it is extremely efficient with my mods.
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MSMS3, is that GRM article online anywhere? I subscribe to GRM but I must've missed it.
HmG_mS3, I agree with MSMS3, stay with the stock BPV and get a CAI first. Like MSMS3, I also have the Mazdaspeed CAI and there is a very noticeable air intake sound that it generates when you're on throttle and the BPV also becomes audible.
I have the Forge V2 BPV. There is really no sound difference between it and the stock one. I can't even hear it 90% of the time.
HmG_mS3, I agree with MSMS3, stay with the stock BPV and get a CAI first. Like MSMS3, I also have the Mazdaspeed CAI and there is a very noticeable air intake sound that it generates when you're on throttle and the BPV also becomes audible.
I have the Forge V2 BPV. There is really no sound difference between it and the stock one. I can't even hear it 90% of the time.
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- MazdaSpeed3
I had a turbosmart for a while and no intake (cause i sold it and my tip) and I hated having a sound and nothing to show for performance. So I sold it and bought a SURE SRI and PG Test Pipe.
I have some 5.1's but those are rare and under ideal conditions. My drag strip 60 ft. times really tell how bad I am at launch and the effects of front wheel drive. 2.3 second 60 fts suck, and that's what I'm more than likely to end up with. These are FWD cars with relatively narrow wheels and limited tire width. Everything works against us at launch. Weight transfer lightens the load on those relatively skinny tires, traction goes up in smoke all too easily, even just trying to feather the throttle and drive the car out of the hole. That's why I tend to rely on 60-100 mph comparisons to my baseline when making mod changes. You can do that reliably with even a simple stopwatch
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Oh, no! Now we get a firestorm of fanboy testimonials. OP, please search and make your own decision based on your own preference. Any intake from a quality manufacturer, either SRI it CAI design will produce nice and relatively similar gains. The only advice I suggest is to consider choosing from among the list of intakes listed on the Hypertech programmer's menu, as they are the most popular and the most likely to work well with any later mods. SEARCH, and ye shall find.
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Perfect advice.
