Forge Bypass Valve Owners!!!

[AutoXRacer]

What are the benefits of upgrading to the Forge Bypass Valve?
What differences are there to the stock piece...?
Will it help produce more power, etc...??
How do you like it?
Any long term problems/issues...?

Thanks!!(thumb)

[ZooMIN3]

Good questions.

I'm thinking about getting the Forge BPV as well.

I wonder if PG has them in stock? I just might get me one....

Forge BPV folks, please offer your opinions!!

-J

[AutoXRacer]

Just spoke with someone at BEGi about this valve; thats where I first saw it.
According to BEGi, the valve holds boost better than the stock valve. I asked her is you had someone drive the car with both valves would they notice a difference...she said no, other than the Forge sounds different...

So whats the point of changing this part...? She did mention it was a better quality part than the stock valve, but the stock valve wasn't a bad piece either...

(uhm)

[subparpunk03]

you replace it if

A)you like the sound
B)you are going to start upping the boost on the engine via engine management or manual/electronic boost controllers.

If you start pumping way more boost in, the stock bpv might leak.

[subparpunk03]

oh yeah also, 99% of people replace it JUST for the sound.

[knowledge007]

I just took my HKS off and put the stocker back on. I can tell you that shifting is a little smoother with the stocker on. Although once I get my PNP connectors for my CP-E EMS, I am thinking of buy the forge bpv and selling my HKS.

[crashkelly]

There is no reason to change BPV or BOV's unless you start producing more boost than the stocker can handle...which is a level most people wont get to...However, if you want to waste hundreds of dollars because you like the sound quality better, well that is your perrogative...but i think it is lame

Does NOTHING for performance and running a BOV when your car was designed to run a BPV is even dumber.

[AutoXRacer]

Thanks for the comments... I was particularly looking at the direct replacement for the stock BPV that Forge offers...its identical to the stock piece...

Doesn't seem like its an upgrade I am interested in doing...

I had read some where in this forum that some members have experienced better throttle response, quicker spool, and slightly higher boost levels +1 +2 psi...supposedly the boost is steadier...

Anyone can confirm this...?
Again, this is strictly for the Forge BPV (the direct stock replacement)...

[crashkelly]

Thanks for the comments... I was particularly looking at the direct replacement for the stock BPV that Forge offers...its identical to the stock piece...

Doesn't seem like its an upgrade I am interested in doing...

I had read some where in this forum that some members have experienced better throttle response, quicker spool, and slightly higher boost levels +1 +2 psi...supposedly the boost is steadier...

Anyone can confirm this...?
Again, this is strictly for the Forge BPV (the direct stock replacement)...

An upgraded BPV is not going to affect spool or throttle response and is certainly not going to raise boost levels. Anyone who claims that a BPV decreased spool time, increased throttle response, or raised boost is flat out lying. And if they believe it to be true they better post some kind of proof.

[SuperStretch18]

...unless the stock BPV is leaking boost, which they have been known to do...

[knowledge007]

This is a direct qoute from PG:

"You’ll notice improved throttle response, better boost handling capacity and quicker spool recovery. Machined from Billet aluminum the MSP02 is completely tunable and serviceable to keep up with your modifications as they progress.

Installation is simple and takes less than 10 minutes requiring no modification to the factory plumbing. The BPV comes with Forge’s “No Hassle” limited warrantee and is available in polished or black anodized finishes."

Anything else Crash???

[crashkelly]

This is a direct qoute from PG:

"You’ll notice improved throttle response, better boost handling capacity and quicker spool recovery. Machined from Billet aluminum the MSP02 is completely tunable and serviceable to keep up with your modifications as they progress.

Installation is simple and takes less than 10 minutes requiring no modification to the factory plumbing. The BPV comes with Forge’s “No Hassle” limited warrantee and is available in polished or black anodized finishes."

Anything else Crash???

Come on dude, of course the manufacturer's quote is going to say some crap like that...I call BS..proof doesnt come in the form of the manufacturer's quote when trying to sell the million of them they produced

[ZooMIN3]

I'm all for the performance value. If upping the boost is where this thing helps the most, then I'll just hold off until I actually need more boost. I want to get my car ready for tracking events in the distant future. So I'll save the extra 150 or so for the wheel and tire package. Thanks for the info you all. Until then, I'll just continue to use the stocker until I actually need to go with an after market BPV.

-J

[Dr. D]

An upgraded BPV is not going to affect spool or throttle response and is certainly not going to raise boost levels. Anyone who claims that a BPV decreased spool time, increased throttle response, or raised boost is flat out lying. And if they believe it to be true they better post some kind of proof.

don't knock it unless you try it! i can speak from experience that my stock BPV DID leak especially on the spike which can be confused with throttle responce so it is what it is you think what you think and i know what i know. i do have the forge and i stand by it and in case anyone was wondering i am running the blue spring with no shims

[patty AT forge]

Different car but the same principals apply. Stock car brought to the same temperature with the only change being swapping the factory valve for one of ours:
http://img223.imageshack.us/img223/3079/forge06sticx3.jpg (http://imageshack.us)

[Haltech]

You really need to inspect your forge for leaks. I was able to move mine about a 1/4 inch and im not sure it its still leaking or not. Beautiful valve but the quality control is less than impressive on these unit.

[astraelraen]

I replaced my intake on the CX-7 before I had my forge bpv and you can definately hear some sort of noise which sounds like boost leak to me with the stock valve. Once I put on the Forge a few days later the noise went away.

[patty AT forge]

We had a batch go out with two problems: loose lock-ring (this part holds the flange to the valve body), and lack of thread sealant on the 28mm side port.

Apologies for that, I've made the techs in the UK aware of it.

[AutoXRacer]

We had a batch go out with two problems: loose lock-ring (this part holds the flange to the valve body), and lack of thread sealant on the 28mm side port.

Apologies for that, I've made the techs in the UK aware of it.

If you buy one now, how will you know if its part of the bad batch...?
Are there serial numbers that we can look for?

[patty AT forge]

If you buy one now, how will you know if its part of the bad batch...?
Are there serial numbers that we can look for?


Nothing like that. It wasn't even a complete batch that had the problems, just a smattering of valves.

The best thing to do is ask for the valve to be inspected when you order... if you order from one of our dealers just ask them to verify that the side port and the lock ring are tight. The valve should NOT rotate on the flange. If it does it is too loose.

[Sierra117]

Smattering. Excellent word choice.

[Haltech]

Nothing like that. It wasn't even a complete batch that had the problems, just a smattering of valves.

The best thing to do is ask for the valve to be inspected when you order... if you order from one of our dealers just ask them to verify that the side port and the lock ring are tight. The valve should NOT rotate on the flange. If it does it is too loose.

So what should we do if we have an affected build? Send it back to forge for a replacement?

[tru-boost]

if you can spin the valve around the flange you just tighten it up with needle nose pliers. if the release port ( the part the bypass hose connects to) spins inside the valve itself, remove it slap some thread sealer on it and screw it back on. there is no need to send it in. both are really simple fixes.

[ZooMIN3]

So now its being said we can replace the BPV with an aftermarket one from Forge, and we "should" get better performance from it?


- How much boost are we talking here that we need to run in order to make the stock BPV useless? 20psi? 25psi?

[knowledge007]

That is a good question?

[Haltech]

if you can spin the valve around the flange you just tighten it up with needle nose pliers. if the release port ( the part the bypass hose connects to) spins inside the valve itself, remove it slap some thread sealer on it and screw it back on. there is no need to send it in. both are really simple fixes.

Thanks TB

[aaronc7]

laloosh is running...18psi? and he said he found that he got more boost with the forge, so he thinks the stock one may be leaking. So maybe as early as 18? If i do anything to up boost, I'm going to get some sort of new valve (Forge is at the top of my list), whether it be MBC (which is very unlikely) or cobb AP.

[tru-boost]

even when my car was 100% stock i noticed a huge difference in my spool up time. when using the blue spring the valve shuts faster than the stocker. the faster it shuts, the faster you start building boost ! not to mention there have been many members who have found their stock valve to be leaky.

[AutoXRacer]

even when my car was 100% stock i noticed a huge difference in my spool up time. when using the blue spring the valve shuts faster than the stocker. the faster it shuts, the faster you start building boost ! not to mention there have been many members who have found their stock valve to be leaky.

How can you test the stock valve for leaks...? I'd like to know if mine is leaking...

[tru-boost]

you can make a boost leak tester. i made one with a PVC cap and a tire valve stem. you can pressurize your intake system and check for leaks everywhere.

[Speedy3]

Different car but the same principals apply. Stock car brought to the same temperature with the only change being swapping the factory valve for one of ours:


So, from my impressions from the graph, the change in performance is somewhat earlier boost equating to torque and power available a little bit sooner?

Also, the ability to go to higher pressures with no leaks?

[patty AT forge]

Correct. There are two ways in which a valve can leak: at boost onset and at full boost. From what I've been reading on this forum the factory Mazda valve does both...

"Bench" testing won't necessarily show either of those problems.

[AutoXRacer]

Correct. There are two ways in which a valve can leak: at boost onset and at full boost. From what I've been reading on this forum the factory Mazda valve does both...

"Bench" testing won't necessarily show either of those problems.


So basically its good practice just to change out the OEM valve...

There goes another mod...:rolleyes:

[ispypsi]

LOL at least it's not a super expensive one (unless you baller up for an HKS Type II that Supras like to run - it's around $350).

BPVs by design are great for stock cars, but I think the whole drive by wire thing screws up the purpose, because as the ECU is fluttering the TB plate going all whacky (esp at WOT in these cars) is allowing the BPV to maybe open just ever so slightly, enough for a little boost to squeak out.

Usually factory BPVs don't fail so fast when upping the boost too. At least most of the metal housing ones don't (1g DSM holds well up to 20psi many times before you have to crush it). I'm wondering if the engineers at Mazda almost didn't purposefully design the stock BPV to start "leaking" after 1-2 psi above the stock amount, as a safeguard. Not that it's gonna thwart someone from throwing on an MBC and trying, but it's another option in the fight against an unexpected overboost from a line coming off or something.

[AutoXRacer]

I'm wondering if the engineers at Mazda almost didn't purposefully design the stock BPV to start "leaking" after 1-2 psi above the stock amount, as a safeguard.

So if you're not running higher than stock boost pressures the OEM valve is OK/does not leak? I was in the understanding that even at stock boost levels that the OEM valve still leaked...?

[redrocketz]

LOL at least it's not a super expensive one (unless you baller up for an HKS Type II that Supras like to run - it's around $350).




More like $200 and $275 to make it fit the Speeds

[knowledge007]

Will a leaking BPV cause stalling issues? Particularly on startup?

[AutoXRacer]

Will a leaking BPV cause stalling issues? Particularly on startup?

(bump)
Anyone have an answer? (shrug)

[CX-7owner]

Will a leaking BPV cause stalling issues? Particularly on startup?
Are you talking about the stock valve?
On startup?
Not that I know of.

[knowledge007]

Yes on the stock valve...

[Adammazda06]

i have the forge valve and have been very happy with it. i was using the blue spring which most people suggest, but i installed the yellow today just to see the difference. if i want to put in a shim, what side does it go on? bottom or top?

[AutoXRacer]

i have the forge valve and have been very happy with it. i was using the blue spring which most people suggest, but i installed the yellow today just to see the difference. if i want to put in a shim, what side does it go on? bottom or top?

Is your car fully stock other than the vavle?
What improvements did you notice, if any?

[Adammazda06]

Is your car fully stock other than the vavle?
What improvements did you notice, if any?

i have intake, cbe, and motor mount. the blue spring builds and seems to hold boost better than stock. the yellow spring that i installed today drive more like the stock valve. still seems to hold and build boost better than stock, but drives smoother than the blue spring. i will drive with the yellow spring for a week or so and the install a shim to see what that does. yes it sounds cool, but the butt dyno feels a difference in the way it drives. i am selling my car for a white one and the only part i am taking off of it is the forge valve if that tells you anything.

[AutoXRacer]

i have intake, cbe, and motor mount. the blue spring builds and seems to hold boost better than stock. the yellow spring that i installed today drive more like the stock valve. still seems to hold and build boost better than stock, but drives smoother than the blue spring. i will drive with the yellow spring for a week or so and the install a shim to see what that does. yes it sounds cool, but the butt dyno feels a difference in the way it drives. i am selling my car for a white one and the only part i am taking off of it is the forge valve if that tells you anything.

Why not keep the other parts too; CAI and motor mount...?

[patty AT forge]

The shims go beneath the spring. You can shim a soft spring to the same crack pressure of a stiffer one but it will have different characteristics as it compresses.

[knowledge007]

Hey Patty, will this piece hold stock psi with heavy bolt ons. For instance,
3"TBE, CAI and upgrade TMIC?

[patty AT forge]

It will "hold" pretty much any amount of boost. As to whether or not your boost will remain the same... from what I've been reading the factory valve is so bad that bolting on ours will "raise" your boost.

Which isn't a fault with our valve, it just brings to light the inadequacy of the OEM piece. I just had to refund someone for this as he couldn't comprehend that the problem was with the stock unit and the HKS that he had on the car (with ours he was running out of fuel, presumably from the factory fuel pump not flowing enough).

Valves cannot raise boost, they can only lower it. In this instance the car as delivered from the factory is equipped with a valve that lowers boost and ours fixes that problem...