With the introduction to Cobb Tuning, returning to the production of rigid parts, their expected release of the bypass valve is welcomed. Many of us have been waiting for a valve that is easily adjustable, sounds great and works 100% without any ups on the turbocharger.
Question: So, what is BPV and what is the difference between BOV (Blow off valve) and BPV (Bypass Valve)?
Answer: It is simple. It all comes down to whether your car is running at speed or massive air. If you have a car with a density of speed, you will not have a mass air meter. In this way, you can start Blow Off Valve, which emits a very loud WHOOSH sound when you shift gears while boosts. The bypass valve accepts, which increases the ventilation of the air and recycles it back to the receiver. The importance of this on a massive air car is that the air has already been measured and calculated, therefore, the ventilation that the air into the atmosphere will cause your can to become rich. You effectively remove the air after counting and allow it to explode in the air, so the car is going to add more fuel, thinking that the air is still flowing. Many enthusiasts prefer BOV sound, but in general, they ultimately cause damage to their statistical converters due to the rich conditions included in the VTA (Vent To Atmosphere) system on a MAF-equipped machine.
Question: What is the purpose of these valves?
Answer:
1) Reinforced cars produce a huge amount of compressed air, which is very quickly pumped through the intake system. When the throttle body is open, this air can quickly move into the engine. As soon as the throttle body closes, this fast moving air has nowhere to go. You have excess air trapped in a small place (charging pipes) that can burst, causing significant damage to your intake system and even the hood of your cars. In particular, on turbocharged vehicles, its main function as a bypass valve (BPV) / Blow Off Valve (BOV) is to release this boost pressure in order to prevent the redirection of this pressurized air to turbo-propellers. If this compressed air is not released, the exhaust air can slow down the turbine wheels and possibly even stop, causing wear and damage to the turbocharger. The wheels of the turbocharger impeller can rotate more than 60,000 rpm, so if the impeller fails, you will see a lot of damage.
2) Its second function is capable of holding a peak pulse during gear changes without significant loss of gain during this event. A good BPV / BOV can maintain a high level of boost, for the necessary gearshift time, without sacrificing performance.
3). One important thing to remember on the Mazda is BPV leaks, even at 8 psi. This is almost half the nominal 15 psi, speed can produce a margin!
Cobb Tuning has an answer for those looking for a loud sound, but with a safety margin, Cobb Tuning XLE BPV. It can be configured to run in three modes, one of which is a hybrid mode that allows a minute amount of VTA, without putting the car in a meager state. You get this loud WHOOSH, but you also get this important counting air returned to the system.
Even though this valve comes at a steep price of $ 299, it is not more expensive than the best-selling BPV on the market, HKS SSBOV ... Cobb XLE does not require any flange adapters. HKS requires an adapter to install on it before it can be installed on Mazdaspeed 3 or 6. Installing the adapter is a pain as it uses a snap ring ... The most disturbing part of HKS is how much plastic can be found inside the valve, but more complicated , ease of regulation. $ 300? Indeed? There are numerous posts on the HKS roll out on our forum ... The plastic inside is breaking ... This is definitely not the type of valve I want in my car. Stand back, we have a new BPV on the market, which will cost $ 299.
Cobb Tuning XLE BPV is one unit that can be adapted to multiple vehicles. First of all, if you plan to replace your Mazda scoobie, this can be done with a simple replacement of parts without having to buy a new valve. The following are the specifications for Cobb XLE:
FEATURES
body
* Body, mounting flange and secondary cover made of 6061 T6 aluminum.
* Body rigidly anodized for added strength.
* The primary outlet has a rectangular shape to ensure maximum cross-sectional area for releasing pressurized air as quickly as possible.
* The secondary compartment lid can be removed to allow ventilation of partial air to the atmosphere or full release to the atmosphere.
* The height of the device is only 3.5 inches from the base of the flange pre-adjustment adjuster to the top level, allowing it to enter the narrowest points.
* The housing for mounting the flange interface is sealed with a sealing ring, which allows the use of flanges of different shapes for several applications.
Piston
A lightweight aluminum piston allows faster response than heavier pistons.
* The aluminum piston was hard-anodized and teflon-drenched to ensure smooth movement, reduce surface wear and minimize maintenance.
* The rounded piston profile smoothes the flow of air as it passes through the cylinder.
* The rounded piston profile mates with a rounded piston seat for excellent sealing when closing a BPV.
* Tight sealing rings are used to tightly seal the piston to the cylinder at normal engine operating temperature without reducing the speed of the piston.
Spring tensioner and spring
* The regulator allows you to adjust the spring preload to fine-tune the exhaust pressure.
* Spring and spring saddles are made of 303 stainless steel.
* The mechanism for adjusting the preload spring and fasteners stainless steel.
operation
* Valves release compressed air very quickly due to light components, port shape and low sliding friction.
* Unique exhaust sound due to air velocity.
* Building materials make XLE BPV compatible with alcohol / water injection due to its inherent corrosion resistance. * Lighter than most BPV and BOV after sales services.
OPERATION MODE
Full recycling - the output is returned to the pre-turbo. This configuration provides the best manageability with MAF-based inventory systems. This configuration generates the least amount of noise.
Hybrid mode - the output goes back to the pre-turbo, and the cover of the auxiliary port is removed. When the piston is open by more than 30%, an auxiliary port opens, audible ventilation to the atmosphere. Less than 30% of open results with full recycling improve handling.
Full Atmosphere - The outlet and auxiliary port are open to the atmosphere. Recommended only for air measurement based on MAP. This configuration generates the highest sound levels.
ADJUSTMENT
Spring Preload — Preload Spring Preload determines the pressure drop across the BPV piston, which is required before opening the BPV, and discharges the charge under pressure. COBB XLE BPV can be adjusted by losing the lock nut and turning the hex head clockwise for more preload or counterclockwise for less. When preload is specified, the lock nut is retained and provides reliable adjustment.
Installation:
Parts List:
* Bypass valve
* O-ring (only for Mazdaspeed 3)
* Paper pad (only for Mazdaspeed 3 or LGT / 08 + WRX)
Required tools:
* 3/4 "Ratchet
* Connector 10 mm and 12 mm
* Open-end wrench 10 mm and 12 mm
* Pliers
Tools required for maintenance:
* 3mm allen key
* 4mm Allen Key
* 13 mm open-end wrench
* Moth lubricant
Installing this part could not be easier. Active bpv has a black color, made of plastic cans, can be found in the Mazda warehouse directly on the cold pipe in the TMIC warehouse.
1) Take a pair of pliers and remove the recirculation hose on the back of the valve (large 23 mm hose). Point the pliers toward the clamping bow, squeeze the pliers to release tension, and slide the back clip 3 inches from the lip. tow the hose to release it from the valve.
2) Take the pliers and take out the small vacuum line just as you did the above recirculation hose.
3) Remove the 10 mm bolts (2) holding the BPV on the pipe and set them aside, we reuse them.
Now you need to decide whether you want to run the full recirc or hybrid mode. If you decide to start a louder hybrid mode, you will need to remove the hatch on the valve with a 3 mm key / bit. Theres only 4 of them hold it, so it is really simple.
After you decide which route you take, remove the paper gasket from the box and place it on the valve, using both bolts to hold them in place. Simply install the valve back onto the BPV flange and tighten it. Now a word of caution is here. If you are using a TMIC propiska, I highly recommend using a ratchet extension with a recess for a 10 mm long hole to manually tighten both bolts evenly. Once they are tightly pressed, give one good 1/4 inch crank on both bolts and that. They hardly require a lot of torque, and we continue to hear that Hercules smashes his bolts in a cold pipe or removes threads.
As soon as you twist it back, simply connect both hoses and pull it into place. I seriously doubt that you will need to make any adjustments to the valve, but if you do, keep reading.
Adjustment:
The adjustment of this valve has no problem. Easy to install a 13 mm socket wrench on the jammed nut on top of which the vacuum line is inserted, then take a 4 mm hexagon and turn clockwise to increase spring tension (increase the likelihood of compressor / ventilation overheating slower) or against clockwise until the spring pressure decreases (decrease the likelihood of pressure increase / compressor discharge).
Now the word for wise noobs for you. Increasing the spring tension here does not increase the amount of boost that this valve can hold. If you want to boost the impulse, you need to install another spring in this valve.
Service:
It is recommended that every time you change the oil, you check your COBB setting bypass valve to make sure that the piston is still moving freely. You can do this by unlocking the BPV from the mounting flange of the car and pressing the piston. If you feel some resistance, it is recommended to remove the piston from the housing and clean and re-lubricate the piston, we recommend using the ARP Ultra-Torque fastener fastener, P / N 100-9911, but any molybdenum-based lubricant will work well. I prefer the red red moth that I used during the installation of the STSP Cobb and the TWM Performance STS.
Disassemble COBB Tuning BPV
To remove the piston, unscrew the base flange from the housing using a 3 mm hex key. Depending on the BPV model, you may have 5-6 head screws. When removing the piston, be careful not to cut the sealing ring. If your o-ring is damaged, you can contact COBB Tuning for a replacement.
Collect COBB Tuning BPV
To assemble the BPV, push the piston back into the housing so that the piston does not protrude from the housing. You can hold the piston at this point by placing a finger on the vacuum connection.
Place the base flange on the housing and reinstall the flange. Secure the flange with head screws 5-6, depending on the model, using a 3 mm Allen key.
Conclusion:
I am so happy that such a light valve appeared on the market that not only looks and sounds cool, but is also fully functional, customizable and not elegant right out of the box. For years, I worked with a forge valve with a blue spring and two gaskets. I have problems with no gaskets, I also have problems with a red gasket. It was 75% at the mark with two gaskets.
With Cobb XLE, I hold all my momentum during the shift and its loud, which means that people know that you are on the rise. It is also not like a pair of ninjas who are fighting with a sword under the hood, as the Forge does.
Watch for a valve that needs lubrication, for example, you are using a hybrid mode, or your car is in a lot of moisture, like rain or snow. This will determine the breakdown of lubrication in the piston.
Also keep in mind that paper pads are necessary for both scoobies and Mazda. I saw how the genius attempted to go straight into the ring and without a flange at 100% level, you miss some momentum without a gasket. So use a gasket belt ... it is reused and necessary for our use so that this valve does not leak.
I would like to thank Gary Sheehan for accidentally putting it in the box when we received Cobb FMIC V2.0!
