The CBV looks exactly like this, You see the number 4 listed? That is the CBV and number 3 is where the vaccum line is hooked up to, to the CBV. If you get a BOV you have two options.

1. Run both the BOV and the CBV. Which means you would hook the BOV's vaccum line to another spot on the vaccum tree. And leave the CBV alone.

2. Block off the CBV with a Blaning Plate from QBM (QuickBrickMotorSports). You will see three 10mm bolts holding the CBV inplace. You remove these bolts and take the CBV off and remove the vaccum line from the CBV. Then you put the blanking plate in the place of the CBV and put the three 10mm bolts back to hold the blanking plate in place. Then you run the vaccum line that was from the CBV to the BOV. No need to run a second vaccum line just reuse the one from the CBV.

 

ok, so is the blow off valve on yours just welded onto teh upper ic? nothing from the upper ic is able to travel into it, correct? Simple a place ot attach it.
Also their are a ton or none Turbo blow off valves on ebay. Are they all crap? I know you said to get the HKS one, but I dont need to abosolute best, but dont want anything that would leak or such. Here are some examples of the ones on ebay:
1
2
3
4
I am prolly going to jsut run both, since I clearly dont know what part I am looking , lol, but I knoe where teh vac tree is so i cna prolly figure out how to run a vac line to it.

 

If you had to go with either of those choices 1 and 3 are the ones I would go with. HKS SSQV and or a Greddy Type RS.

The BOV that is on my car is attached to the Upper IC Pipe yes. The flange was welded on the Upper IC Pipe and the BOV was placed on the flanged and tightened down. No nothing will travel into the BOV from the Upper IC Pipe.

 

so no go on teh JDM(#4)? looks to be similiar to the HKS

 

it's a fake. And the fake knock off suck.

Go real or not at all. I mean $160 for an HKS SSQV is a great price. Under $220 is a good price.

 

is the upper ic 60mm?

 

60mm? I have no clue. You need to buy an Aluminum flange. I suggest calling the company you buy the BOV from and see what they recommend.

 

kk, will do

 

Hey, I noticed you said "You have a shop drill a hole and have them weld an ALUMINUM flange over the hole on the Upper IC Pipe." in that other guys thread. Whats the point of the hole if nothing from the upper ic is going into the BOV?

Also, on the speed tuning ecu chip, did it kill your gas mileage? I plan to call speed tuning to ask questions about it, but thought I would ask you that one.

 

Yeah you have to drill a hole in the pipe. That was just something obvious and you didn't ask. Excess boost is going into the BOV and venting to the atmosphere.

I get about 20-25 MPG with my ST USA ecu upgrade. You should run PREMIUM gas on the any ecu upgrade. I run REGULAR and it isn't a problem, but I just put PREMIUM in and wow what a difference it makes.

 

ok a couple more q's. I thougth when tehy say vent into atmoshpere they just meant into the air in the engine, so it goes into the upper ic?

also, i plan to amke teh chagen to premium, btu will ahve like a gallon or so of regular still in the tank when I fill it, this wont cause problems right?

 

Ok right now your CBV is recirrculating the excess boost back into the intake track. When you get a BOV the BOV vents the excess boost into the atmosphere. It is a pretty simple concept. You know the sound you hear when the BOV goes off? That is the excess boost being vented to the atmosphere.

No there will be no problem if there is some REGULAR in there when you start using PREMIUM.

 

ok tahts teh part that I got confused at, I thought that the excess boost would be comming form the vac line connected to the bov, its comming from the upper ic? Thats what the hole is for right? Otherwise I dont get what the hole is for. I get taht the boost is venting into teh engine when it goes off, thus making the sound.

 

Yes that is what the hole is for. Nothing but air is going through that Upper IC Pipe.

 

so then my last question would be, why is it gonna be connected to my vac line tree?

 

Because that is another intergral part of how a BOV works.

 

"A compressor bypass valve (CBV) also known as a compressor relief valve is a vacuum-actuated valve designed to release pressure in the intake system of a turbocharged or centrifugally supercharged car 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 blowoff valve, (BOV, sometimes hooter valve, dump valve) does basically the same thing, but releases the air to the atmosphere. This creates a very distinctive sound desired by many who own turbocharged sports cars. Some blowoff valves are sold with trumpet shaped exits that amplify the "Psshhhh" sound, these designs are normally marketed towards the tuner crowd. For some owners this is the only reason to fit a BOV. Motor sports governed by the FIA have made it illegal to vent unmuffled blowoff valves to the atmosphere. In the United States, Australia and Europe cars featuring unmuffled blowoff valves are illegal for street use."

"
Downsides of releasing air to atmosphere The unique sound caused by a blowoff valve (but not a compressor bypass valve) sometimes comes at a price. On a car with a mass airflow sensor, doing this confuses the engine control unit (ECU) of the car. The ECU is told it has a specific amount of air in the intake system, and injects fuel accordingly. The amount of air released by the blowoff valve is not taken into consideration and the engine runs rich for a period of time. Engines with a manifold absolute pressure regulated ECU are not affected. Typically this isn't a major issue, but sometimes it can lead to hesitation or stalling of the engine when the throttle is closed. This situation worsens with higher boost pressures. Eventually this can foul spark plugs and destroy the catalytic converter (when running rich, not all the fuel is burned which can heat up on and melt the converter). Purpose of Relief and Blow Off Valves Blowoff valves are used to prevent compressor surge. Compressor surge is a phenomenon that occurs when lifting off the throttle of a turbocharged car (with a non-existent or faulty bypass valve). When the throttle plate on a turbocharged engine running boost closes, high pressure in the intake system has nowhere to go. It is forced to travel back to the turbocharger in the form of a pressure wave. This results in the wheel rapidly decreasing speed and stalling. The driver will notice a fluttering air sound."

 

o ok, I get it, so would installing one on the upper ic have any negative effects?

 

Just what I posted. Your going to run rich for a split second everytime the BOV goes off. Other then that no. Oh and that is anywhere you install a BOV on your car not just an Upper IC Pipe thing. You will run rich for a split second when the BOV goes off no matter where the BOV is located.

 

but running rich for a split second wont really have any affect, since its low psi setup. "Worsens with higher boost pressure", just want to make sure that if I do do this, it not putting even mroe stress ont eh car than not having one is.