no, the red spring is MUCH stronger than stock and designed to release at 30+ psi..stock is only pushing like 17
Forge Motorsports Bypass Valve
- Thread starter Zixxspeed
- Start date
no, the red spring is MUCH stronger than stock and designed to release at 30+ psi..stock is only pushing like 17
I second that! It pulls so much better, The Auto trans on my car shifts smoother, although I prefer the sound of the leaky stock unit the difference is day and night, the car pulls when it used to feel like it was dying, and it was all because of the crappy OEM BPV. GET ONE, YOU WILL NOT BE SORRY!
mrdouble99
Member
- :
- Mazdaspeed3
Best sound clip of the forge bpv
http://fr.youtube.com/watch?v=4Pj2yVFyrFc
http://fr.youtube.com/watch?v=4Pj2yVFyrFc
Running blue & 2 shims no problems.
patty AT forge
Member
The boost pressures quoted from our website are based on information gathered primarily from the VW/Audi market. The valve that the VAG (Volkswagen Audi Group) 1.8T uses shares the same internals as the MAZ2.3 valve that we manufacture. However the vacuum characteristics of the 1.8T are VERY different from your engine and the VW valve is installed with boost entering what would be the discharge port on the FMDVMAZ3 so that information isn't really relevant.
My recommendation, which will change if new information presents itself:
Yellow, yellow with shim - Stock
Yellow with shim, blue - Mild upgrades with only a negligible increase in boost
Blue, blue with shims - Common bolt on parts with significant increase in boost
Blue with shims, Red - High boost applications
Spring pressure doesn't tell the entire story. You must also take into account the effected area of the piston or the diaphragm. Given the same amount of boost or vacuum there is more force acting on the OEM valve as the surface area of the diaphragm is greater than that of our piston, thus the stiffer spring that still doesn't hold as well as ours.
If your car doesn't seem to respond as well with the Forge valve look for the following:
Loose cap
Loose flange
Loose side port
Perform the "pen-test" http://www.forgemotorsport.com/media/valve_service(1).pdf
Check for leaks, especially anywhere that was effected by the install - manifold reference line, where the valve couples with the charge pipe, discharge hose to the turbo inlet pipe
My recommendation, which will change if new information presents itself:
Yellow, yellow with shim - Stock
Yellow with shim, blue - Mild upgrades with only a negligible increase in boost
Blue, blue with shims - Common bolt on parts with significant increase in boost
Blue with shims, Red - High boost applications
Spring pressure doesn't tell the entire story. You must also take into account the effected area of the piston or the diaphragm. Given the same amount of boost or vacuum there is more force acting on the OEM valve as the surface area of the diaphragm is greater than that of our piston, thus the stiffer spring that still doesn't hold as well as ours.
If your car doesn't seem to respond as well with the Forge valve look for the following:
Loose cap
Loose flange
Loose side port
Perform the "pen-test" http://www.forgemotorsport.com/media/valve_service(1).pdf
Check for leaks, especially anywhere that was effected by the install - manifold reference line, where the valve couples with the charge pipe, discharge hose to the turbo inlet pipe
I installed a VEI boost gauge a month ago. During that time, I've recorded a peak boost spike of 19.2. Boost usually tails off to 11's or 12's at WOT. After installing a Forge BPV today with the yellow spring, I went right out a saw a peak of 19.5 and held 15's at WOT. This thing works great!
GioDiGreek
Member
I installed my FV last weekend with a mazdaspeed CAI. I have the yellow spring no shim. It's very goodl. I have to use to the sound wich is cool in a way. Not very loud but noticable. The package though came with no green spring. Also was no instructions how to place the shims and what is the purpose. Any one can tell me? Thank you.
you will not use the green spring, as it is too weak for the 2.3 disi.
the shims go under the spring and serve to give a slightly tighter spring rate. it basically gives you an inbetween feel between the yellow and blue.
i personally use the yellow with 1 shim.
GioDiGreek
Member
Thank you much! I really enjoy this mod. The car is more responsive and holds the boost better. I think also had a power gain.
- :
- 2011 Mustang GT
I'm still running blue with no shims, only mods are the CAI and motor mount. I do get some shuttering under hard acceleration, and I've already had the TSB done for the fuel pump reflash/replacement. I'm thinking of swapping back to the yellow with one shim and seeing if it changes anything.
depending on what mods you have if u feel like it is loosing air and you want more pressure
GioDiGreek
Member
I instaled one shim. Not much of a difference. I have no mods only a MS cold air intake.
I got one and installed it today. Im using the yellow spring with one shim however i can barely hear it. I double checked my connections and im still holding boost. Im running everything stock exsept the valve itself and an ETS TMIC. Does anyone know why this might be?
The OEM airbox pretty much mutes all the intake sounds...
You are only going to hear the ping noise when you are in a boost condition and then quickly let off the gas pedal. i would go with a blue shim at least.
