BOV/BPV Thread

[faeker]

The posts in this thread just keep getting more retarded.

tappy-tap-tappytalk

[GODspeed7]

Originally Posted by faeker The posts in this thread just keep getting more retarded. tappy-tap-tappytalk

What did I say?!?!


Tapatalk LIKE A BOSS!

[faeker]

Hahaha. Not yours.

tappy-tap-tappytalk

[silvapain]

I swapped my stock BPV with the small port plugged with a TurboSmart BPV, and I noticed no change in boost or response whatsoever. The TS unit is actually quieter than my stock unit was.


Tapadatass

[faeker]

omg i hate playing nice.


you may be using the wrong spring/shim setup for stock boost levels.

[GODspeed7]

Posted in wrong thread


Tapatalk LIKE A BOSS!

[dbeotee]

Is a stock bov just as good as an aftermarket one if im not boosting over 20psi and I'm just gonna recurc the aftermarket one?? I don't care about the sound I want performance.

[irishking03]

Originally Posted by dbeotee Is a stock bov just as good as an aftermarket one if im not boosting over 20psi and I'm just gonna recurc the aftermarket one?? I don't care about the sound I want performance.

If your doing performance mods eventually your gonna need a new bpv/bov. Once you start upgrading your parts you can increase your boost with a tune and eventually that POS stock thing will say fuck you. It's not something you need now but once the mod bug hits you should probably look for one.

Razr-Maxx-Tapa-Talking-2

[silvapain]

Originally Posted by dbeotee Is a stock bov just as good as an aftermarket one if im not boosting over 20psi and I'm just gonna recurc the aftermarket one?? I don't care about the sound I want performance.

I went up to ~27 psi on the stock BPV with the K04 and E85 with no noticeable issues. I only put on a TurboSmart BPV because I got a great deal on it.

[GreyGhost]

I just through on a Greddy Type RS BPV with plans of increasing my boost in the future and it was cheap.

[Madfbskills69]

thank you so much for all of these threads. im about to purchase my MS3 soon and knowing all of this info ahead of time before i upgrade is a huge help

[jk_ms3]

It's almost time to add the soon-to-be-released CorkSport BPV to this. @irishking03;

[itzmewu]

I am planning on going VTA with the BOV and does anyone know what the plug size fit for the inlet tube?

Torque solution is selling a plug but they offer it in 1" and 1.25" and im not sure which size would best fit in the intlet tube.

Torque Solution Billet Aluminum 1" Bypass Plug: Universal

[irishking03]

@jk_ms3; ill add it when its released keep me posted when it does if I dont see it.

Sorry guys ive been busy with a new house just getting married and my new son. I am going to go over this whole thread tomorrow or Monday to see what I need to update. Appreciate everyone liking it and making me aware of what needs to be changed.

Sent from my SCH-I605 using Tapatalk 2

[SlvrSpd3]

So I just installed corksport stage 2 intake and hks bov. I ran it recirculated. Whenever I build boost it makes a flutter sound, but not that high pitch sound im used to hearing. Do u not get that sound when u run it recirc? OR is the woosh my intake and the bov doesn't make a sound because of the recirc and not atmospheric?

[irishking03]

Originally Posted by SlvrSpd3 So I just installed corksport stage 2 intake and hks bov. I ran it recirculated. Whenever I build boost it makes a flutter sound, but not that high pitch sound im used to hearing. Do u not get that sound when u run it recirc? OR is the woosh my intake and the bov doesn't make a sound because of the recirc and not atmospheric?

Its cause you took the whistle part out of bov. I have same thing. When wide open it makes a sneezing sound. Look at my youtube page and listen for yourself. My user name there is the same as the forum. IRISHKING03

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[SlvrSpd3]

Mine sounds exactly the same, you have an sri tho right?

[irishking03]

Originally Posted by SlvrSpd3 Mine sounds exactly the same, you have an sri tho right?

Yes sir. Hks suction reloaded sri

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[SlvrSpd3]

So if I didn't install the hks would it make the same sound?

[irishking03]

Originally Posted by SlvrSpd3 So if I didn't install the hks would it make the same sound?

Its the blow off making the sound not the intake. I feel as though the intake and tip make more of a sucking sound and you can hear the turbo spool alot better without the oem tip

tappin dat trigga

[SlvrSpd3]

I has a cobalt ss/tc and the k&n intake made the same sound with my stock blow off valve.

[faeker]

I'm having a hard time not commenting here. Seriously..................................

[irishking03]

Originally Posted by faeker I'm having a hard time not commenting here. Seriously..................................

Lol

tappin dat trigga

[SlvrSpd3]

Is there a sticky on this then I should read?

[jk_ms3]

Originally Posted by SlvrSpd3 Is there a sticky on this then I should read?

Here you go: BOV/BPV Thread

[faeker]

Originally Posted by jk_ms3 Here you go: BOV/BPV Thread

I really hope you were being sarcastic there.

[irishking03]

Originally Posted by faeker I really hope you were being sarcastic there.

I hope so to

tappin dat trigga

[jk_ms3]

Originally Posted by faeker I really hope you were being sarcastic there.

[Esteban123toro]

my hks super sequential broke, like that internals fall apart, so i was wondering which bov will be healthier for my car i have a gt3076r, i dont understand much about the vta and the other i really dont care about sound, just want to do it right.. thanks

[Ziggylittles]

Originally Posted by Esteban123toro my hks super sequential broke, like that internals fall apart, so i was wondering which bov will be healthier for my car i have a gt3076r, i dont understand much about the vta and the other i really dont care about sound, just want to do it right.. thanks

You're bt and don't understand blow off valves?


Tap

[irishking03]

If you are bt you might want something like a tiaol bpv not the hks.

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[Dat8687]

When I had my speed 6 a few years back the craziest thing was when I installed my HKS SQV III then went back to a SQV II.

I literally blew the BOV off the charge pipe because I had installed the ring it in backwards that hold it in the flange. But what was crazy is the car ran fine it just wouldn't build any boost. And it didn't throw a SINGLE cel/Code the entire time with the BOV blown off the pipe. Which I thought was pretty weird.

[faeker]

now with three times the hate

[irishking03]

@faeker; you kill me with the comments you make. I'm cracking up from that picture

tappin dat trigga

[Maxdaspeed6]

This is great. I'm a newb at modding and I have been reading up like crazy for the past 3 weeks! Pure gold I tell ya! Thanks dude

[Inquisitive]

BPV / BOV

A Blow-off Valve (BOV) or Bypass Valve (BPV) is a pressure release system present in most turbocharged engines. Its purpose is to prevent compressor surge, and reduce wear on the turbocharger and engine. Blow-off valves relieve the damaging effects of compressor "surge loading" by allowing the compressed air to vent to atmosphere, making a distinct hissing sound, or recirculated into the intake upstream of the compressor inlet. They provide improved / quicker throttle response, better boost handling capacity / higher clamping load to maintain boost pressure more reliably and quicker spool recovery.

A compressor bypass valve (CBV), also known as a pressure relief valve or diverter valve, is a manifold vacuum-actuated valve designed to release pressure in the intake system of a turbocharged vehicle when the throttle is lifted or closed. This air pressure is re-circulated back into the non-pressurized end of the intake (before the turbo) but after the mass airflow sensor.

A blow-off valve, (sometimes "hooter valve", not to be confused with a bypass valve) performs the same task but releases the air into the atmosphere instead of recirculating it. The blow-off action produces a range of distinctive hissing sounds, depending on the exit design. Some blow-off valves are sold with a trumpet-shaped exit that intentionally amplifies the sound. Some turbocharged vehicle owners may purchase a blow-off valve solely for the auditory effect even when the function is not required by normal engine operation. Motor sports governed by the FIA have made it illegal to vent un-muffled blow-off valves to the atmosphere.[citation needed]

Blow-off valves are used to prevent compressor surge, a phenomenon that readily occurs when lifting off the throttle of an unvented, turbocharged engine. When the throttle plate on a turbocharged engine closes, the high pressure air in the intake system is trapped by the throttle and a pressure wave is forced back into the compressor. The compressor wheel slows rapidly and may even stall, and the driver will notice a fluttering air sound. The rapid slowing or stalling stresses the turbo and imparts severe turbo lag if the driver accelerates immediately after the surge event.

Disadvantages
In the case where a mass airflow sensor (MAF) is used and is located upstream from the blow-off valve, the engine control unit (ECU) will meter out excess fuel because the atmospherically vented air is not subtracted from the intake charge measurements. The engine then briefly operates with a fuel-rich mixture after each valve actuation.

The rich mixing can lead to hesitation or even stalling of the engine when the throttle is closed, a situation that worsens with higher boost pressures. Occasional events of this type may be only a nuisance, but frequent events can eventually foul the spark plugs and destroy the catalytic converter, as the inefficiently combusted fuel produces soot (excess carbon) and unburned fuel in the exhaust flow can produce soot in the converter and drive the converter beyond its normal operating temperature range.

An alternative method for utilizing both a MAF and a blow-off valve is to have the MAF located down stream between the intercooler and the throttle plate. This is known as Blow-through rather than the traditional Draw-through set up. Care must be taken as to the position of the MAF to prevent damage to the sensitive element. (I.E. on a SR20DE motor, the MAF must be at least 12" from the throttle plate, and the blow-off valve must be 6" from the MAF sensor). By using a draw-through method, the MAF won't be affected by the blow-off valve opening as the pressure is vented before the air reaches the MAF.

One approach used to mitigate the problem has been to reduce the boost pressure, which reduces the required venting volume and yields less charge over-calculation by the ECU. The air can also be recirculated back into the intake, a typical stock setup for cars with an upstream MAF sensor. The situation can also be corrected by switching the fuel metering system over to a manifold absolute pressure sensor, a conversion that usually requires a compatible aftermarket ECU or piggy-back fuel controller. The MAP sensor monitors the absolute pressure in the manifold at all times and will correctly detect the change that occurs when the valve vents, allowing the ECU to reduce fuel metering accordingly.

Operation
A blow-off valve is connected by a vacuum hose to the intake manifold after the throttle plate. When the throttle is closed, the relative manifold pressure drops to below zero bar and the resulting pressure differential operates the blow-off valve's piston. The excess pressure from the turbocharger is then vented into the atmosphere or recirculated into the intake upstream of the compressor inlet.

FYI
Most BOV/BPV will need some maintenance through the years. Basically they need to be re-oiled.

The following list will be discussed below with images:

• Forge (both V1, V2 and unknown versions purchased) BPV
• Turbosmart Dual Port BPV / BOV Combination
• Go Fast Bits (GFB) Respons BPV / BOV Combination
• Forge V2 BPV
• Forge V1 BPV
• HKS SSQV BOV
• CorkSport (CS) MZR BPV
• Cobb XLE BPV / BOV Combination
• Synapse Synchronic BOV
• Forge V? BPV
• TurboXS BPV
• Tial QR BPV
• Turbosmart Kompact Plumb Back BPV
• GReddy RZ BOV
• CX Racing BOV (comes with their FMIC)
• JBR DISI Bypass Valve Return Hose
• Synapse Synchronic DV

Turbosmart Dual Port Maz Type 5 BPV / BOV Combination

Billet aluminium; Holds boost more efficiently over stock valve; BPV spring rate is tuneable to the vacuum of your car; Choice of high pressure and low pressure springs; Gain Top End Horsepower; vents to intake, atmosphere becoming a blow off valve or adjustable mixture of both, while the Sleeper version is quiet during mild boost; note: both are taller, therefore, will not work with stock air-box
Available from: Turbosmart Dual Port Maz Type 5 BPV / BOV Combination
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $482.96

Go Fast Bits (GFB) Respons BPV / BOV Combination

Dual action, twist BPV to BOV adjustable
Available from: Go Fast Bits (GFB) Respons BPV / BOV Combination
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $268.68

Forge BPV

Made from billet aluminium
V1: Makes a ping / swords clashing noise
V2: stealth
Available from: Forge BPV
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $169.95

HKS SSQV BOV

Info: http://www.hksusa.com/
Nickel-plated, die-cast metal secondary valve, which is swaged to the primary valve, a stainless steel C-Clip and spring to increase sealing and durability; First Sequential Blow-Off Valve featuring a unique, pull-type, sequential valve structure and a differential pressure control system allowing for stable operating ranges from low to high boost pressures. Note that a separate flange must be purchased and fitted to the BOV before installing on your car; comes with inline filter on the vacuum line; can keep closed at idle. The recirculating kit is an optional extra (additional expense), but note that 100% VTA can damage your CAT.
Requires a separate (extra cost) mounting flange kit which is difficult to install properly (ex. CP-E, Jay Racing / JSC Speed, etc.)

Available from: Hasegawa, Kitagawa, and Sigma (HKS) SSQV BOV
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $331.95

CorkSport (CS) MZR BPV

Half the spring height, 30% larger piston, 33% faster to vent
Available from: CorkSport (CS) MZR
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $188.99

Cobb XLE BPV / BOV Combination

Different vent modes, pre-load adjustable, compatible with alcohol / water mix, reliably holds high levels of boost without leaks, fast venting, Teflon coated, hard anodized piston providing low sliding friction, reduces surface wear and minimizes maintenance requirements, can hold up to 60 psi
Available from: Cobb Tuning XLE BPV / BOV Combination
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $295

Synapse Synchronic BOV

Eliminates the need for diaphragms by using a piston actuator that does not require frequent lubrication; can hold 60 psi yet still prevent compressor surge; can install as pull or push type valve
Available from: Synapse Synchronic BOV
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $289.95

TurboXS BPV

Each flange is beefy to keep it from warping and allowing you to have the best mating surface possible
Available from: TurboXS BPV
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $239

Tial QR BPV

6 spring options (3 PSI to 12 PSI)
Available from: Tial QR BPV
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $259 silver, black, red, purple, blue

Turbosmart Kompact Plumb Back BPV

Available from: Turbosmart Kompact Plumb Back BPV
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $184.49

GReddy RZ BOV

Easily adjustable to eliminate compressor surge and preventing premature boost leakage while increasing boost response between shifts; made of durable cast and billet aluminium frame; valve to diaphragm ratio provides performance that cheap piston types cannot offer; spring stiffness adjustment screw; three models
Available from: GReddy RZ BOV
MS6 (?), MS3 Gen1 (?), MS3 Gen2 (? Although several Genpu owners have installed this) $360 for Type FV for RX-7

CX Racing BOV (comes with their FMIC)

Available from: CX Racing BOV (comes with their FMIC)
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $399

JBR DISI Bypass Valve Return Hose

Direct (5 layers silicone & 4 layers of reinforcement) replacement for OEM, which will show signs of deterioration and cracking within a year degrading performance to eventually throwing a CEL.
Available from: JBR DISI Bypass Valve Return Hose
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $35 in red, blue, black or white

CP-E Helihose

4-ply reinforced silicone hose, helical cut throughout for flexibility, steel wire routed through the hose to prevent kinking, while maintaining extreme flex, two SS liner clamps are included, providing clamping pressure without tearing silicone, gloss silicone finish with CP-E logo, 14.5” in length, made in the U.S.A., lifetime warranty
Available from: CP-E Helihose
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $64.48

CorkSport (CS) DISI Silicon Bypass Valve Hose

Made from long lasting, four-ply reinforced, high quality, molded silicone for a strong flexible connection for ideal flow from the bypass valve to the turbo inlet pipe, comes in black, red, blue or white with two T-Bolt clamps
Available from: CorkSport (CS) DISI Silicon Bypass Valve Hose
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $39.99 in black, red, blue or white

Synapse Synchronic DV

Eliminates the need for diaphragms by using a piston actuator that does not require frequent lubrication; can hold 60 psi yet still prevent compressor surge; extremely fast response (< 25 msec) to eliminate compressor surge, 6061 aluminium, use a bolt on adaptor or weld Al or SS flange
Available from: Synapse Synchronic DV
Caps for Synapse Synchronic DV
MS6 (Yes), MS3 Gen1 (Yes), MS3 Gen2 (Yes) $282.95; standard black cap (or colours: blue, red, orange, raw - add $29.99)

[Raider]

I think the lists should not be by popularity. Just lists. I would just remove that wording. I like the refresh overall. Can you include details from the OP in your revision?

I know CPE and Corkssport also have recirc hoses, too.

[Inquisitive]

Updated

Of course I disagree on mentioning popularity. If I was a manufacturer, I would pay for this valuable information as a useful tool in deciding on which price inflection point to use to increase sales and yet, we are offering it free and unbiased here. Paying for market research can be subject to conflicts of interest, competitors’ larger marketing budget, etc. ex. Google ads. Some manufacturers are conducting their own research on this forum. Certainly vendors have looked at my public profile. However, in deference to your wish, I have removed this wording.

The OP was biased by his choice for HKS over TS.

I have dropped the huge wiki images, which are really too large to be displayed properly in a thread and thus, are of questionable value.

I have moved the HKS flange example to immediately follow HKS.

You are a fountain of knowledge. I have added the CP-E and CS recircs.

[FruityRudyMS3]

Will the JBR recirculating hose fit on a Cobb TIH and a SSQV?

[Raider]

Yes.