IGY you have it backwards, you want it to open at the point of pressure, because its furthest away from the turbo. It doesnt matter in the least that a little pressure builds at the TB before being released because the turbo never sees it. If you open it at the furthest point away from where the pressure builds (near the turbo) , you run the risk of possibly letting that pressure creep all the way back. Just think about it as a straight line...if the BOV is at the end, all that air keeps going in a straight line. If its at the beginning of that line, that air at the very end has to come all the way back through turbulence. Now it *probably* doesnt make a damn bit of difference where u put the thing if it works well, but im just sayin

 

SideWindeRx7 I appreciate that bro thanks

and Zack are you almost done? Look at your car and look at mine. This is my 2nd 3d gen I have kind of an idea what's going on here. I don't need comments like that from you or at least not more than once. I get it faucker it just happened that I didn't get to the bov part yet on my car and I didn't think you need to upgrade and still don't think so. I'm going to try the 2 stock bovs in different locations just to **** you off. And you know what it's going to probably work. If not then I'll get a tial or hks. We know funtion before form man but I want something that sounds nice not a loud stock bov sound. Maybe you can get parts that you arent totally satisfied with on your car but mine is in mint condition and I'm just about 100% done modding it so I want it how I want it.

Go build up a 3d gen and run 11 second passes at 121mph first time at the track and then you can tell me how shitty I have the car set up.

 

I can't beleive this.......

 

Personally I think you should sell you car and get a civic. Are you trying to use the stock FPR with your single? I haven't heard to many people have problems with the stock one on stock turbos... Just because people don't have problems with the stock BOV on stock turbo's doesn't mean it will work perfectly with an aftermarket turbo setup.

Now I know you have already got an Aftermarket BOV, but come on man, your being pretty ignorant.

Im glad you are capable of putting a vacuum line on a stock BOV, the problem is doing it right...

And no why would I use a stock BOV with a complete aftermarket setup.... once again im not using the stock FPR on a completely different fuel setup...

I read everything you had written unfortunately, but since you take everyone with a grain of salt except Jimlab and a select other few why should anyone bother responding to your posts?

 

I have 2 more stock BOV's if you wanna throw those on your ghetto system....

4 should work great

 

I am also using the stock fuel pressure regulator yes. It is working great with the 1200 injectors in the stock fuel rail and the stock engine elso with stock tire sizes and a stock differential and a stock shifter

you get all the great deals man I just cant afford to upgrade everything like you lol

I admit I was maybe being an ******* after I got some shitty relies from everyone that didnt show me that you guys really know whats going on

but a lot of you were ******** as well

I dont want like 4 stock bovs lol Im just curious to see if the 2 I have will work until I can upgrade. Im not at home I have no access to tools

 

I am a full time college student, living on my own, never have had help from the parents on anything, and I have a fully modded 7. I can't do it all at once, but it can be done, so I understand where you are coming from in that situation.

And you are right, I get great deals... Its all about who you know, who can help out, and waiting for the right time. I have got a lot of parts by working on other people's 7's.

 

I am a full time college student, living on my own, never have had help from the parents on anything, and I have a fully modded 7. I can't do it all at once, but it can be done, so I understand where you are coming from in that situation.

And you are right, I get great deals... Its all about who you know, who can help out, and waiting for the right time. I have got a lot of parts by working on other people's 7's.

 

ive talked to you on aim youll **** when you know who i am lol

any way none of this was really necessary everyone cussing at each other I just wanted to find out whats going on with the bovs

I bought the car the way it is and I just figured out that the noise was compressor surge and that that isnt good

I was told that maybe a different bov would solve it but that its ok for now

I wish I could work on other peoples 7s in trade for stuff I am also a full time college student. The local guys here arent very helpful at all and it takes forever for me to get anything done with my only tool being a steak knife (seriously) as my roomate ive done tons of stuff with that and some tape lol for cutting wires/hoses

 

5 dollar pair of wire strippers/crimpers are your friend

 

It really does sound like the stock bov is installed backwards. Either that or they are defective. I've ran 20psi making 400+rwhp on the stock bov's and they might leak a little but they dont surge....when your using 2 of them anyway, which you are.

The air only flows out one way and there is a arrow showing which way the air flows out of the bov. I know this is real "newbie" but just in case (and especially since you didnt build the car) look and make sure the arrow is pointing to atmosphere. Also, you could have some kind of clog in the vac line or if your using any of those nipples on the uim they dont work. You need to use a uim nipple and I'd do like someone else suggested and use a seperate line for each bov.

If none of these are issues then your stock bov's are just defective and need to be replaced. Those 2 stockers in good working condition flow pleanty for you to run 10-15psi with a T66 and not get compressor surge

STEPHEN

 

stephen Ive also talked to you on aim
I was the guy that bought the motor for my last 3d gen from your buddy down south in florida that now did that v8 swap remember

thanks for your help, I had searched and found your post saying how the stock bovs work with high hp and boost. I KNOW they do theres no reason why 2 of them cant get rid of 16.5 psi when 1 of them was working fine with the twins at 13psi. Thats why I dont appreciate these clowns being all over me like I'm a moron when they are jackasses. Any way its the price you pay for having the forum (which is really helpful whenever I need something I search)

I've been testing them a lot.
I know I didn't put the car together myself...but you better believe that I took it apart and put it back together when I got it. I understand how everything works and I set it up my own way. I'm going to try to hook the vacuum like to a different nipple on the uim just like you said. I'll try the front ones where the purge solenoid is hooked up to. Maybe the vacuum line is too long from the elbow to the uim and by the time it gets vacuum to the bov its surging already. NO the bovs aren't installed wrong lol. The small nipple side is where the big hose is installed and runs to the elbow. it would be pretty hard to mix that big arrow up and put the small nipple facing the wrong way. I don't think my bovs are defective whats the chance of that. I didnt test them with numerical readings but I did suck on the vacuum line and then crimp it off and I could blow totally through both of them.


any way ill try moving the vacuum line and running a seperate vacuum line for each one and we'll see. Ill also test to see if they are leaking by putting a hose on the end of them and running them into the car. They shouldnt leak at all once in any boost right? Any way if they are leaking my profec will compensate and my turbo will just have to work a little harder. As long as im getting 16.5 psi to the engine then its fine

sorry for the long wordy reply

 

UPDATE:
heres a vid of my compressor surge!...the car is kind of laggy since the motor is blown

http://216.98.9.98/rx7/118-1897_MVI.AVI

I bought a hks ss bov and will have it on at the time of the engine replacement....we'll see if that fixes it but I dunno

 

I just hooked up my t70 single kit. I have an HKS SSQ BOV. I didn't even put that heavy, nasty, shitty bitch on there. I hate that BOV. I put the 1 stock one on there and plan to put another where the ICV connected to the Elbow. I have seen no surge at lower rpms because of it. However I am not able to go above 5k right now, as I am still tuning my car.

Yes, the stockers are a little leaky, but it should not cause surge. They also sound very cool on my setup. They have an HKS type S sound to them. You know the ch-ch-ch-ch sound.....KOOOL

 

Correction, theoretically, it shouldn't matter which end has the BOV (compressor side or throttle body side) since we're dealing with pressure. Pressure should be equal regardless of which side of the piping you're on. The duty cycle of the BOV should be able to relieve enough pressure to prevent compressor surge since the compressor will also be spinning down.

The vacuum helps pull the diaphragm and allow the plunger to open up based on spring tension. The BOV mechanism is similar to the wastegate, but different applications (BOV => prevent compressure surge; wastegate => control boost by controlling the wasted energy or exhaust gas).

 

Correction, thats not true. The pressure on the cold side (between IC and engine) of the IC system is lower than on the hot side (between turbo and IC). Depending on the IC design, cfm, and pressure your running it can be as much as 4-5psi of difference.

Stephen

 

surge...there was an article in Rxtuner. I believe the premier issue. There is a silver Rx7 witha T78 that had an hks or blitz BOV, and i think he was running 18psi, and he still mannaged to have compressor surge and blow his turbo. I went with an aftermarket BOV because i didnt want to worry about it. If you are planning on running lower boost levels i dont see why the stock BOV wouldnt work, but if you want to raise boost i would definately get an aftermarket BOV.

 

The stock bov shouldn't go ch ch ch ch....that sounds like compressor surge