You know how evo 8s have a plastic bypass vaulve from the factory. Well could you posibly pull out the side that returns the air into the intake side and leave it out so it vents into the atmosphere for a better sound? as long as u filled the open hole on the intake side.

Please tell me if this is a bad idea but to me it seems like a cheep way to get a BOV that dumps to the atmoshpere. and if this wont work and i do buy a aftermarket BOV how do i fill the hole on the intake side?

and is there bypass vaulves on the market that will return the air to the intake side and still make the WHOOOOOSH!!!!

 

God help us.

 

Amen. get an hks ssqv

lol, if you really want an atmospheric valve, get a tial bov. they are probably the best out therer and can hold the most boost. but if you want to stick to recirc that still sounds atmospheric, i heard the forge recirq is pretty loud

 

ok so form the reaction the stock bypass wont work but why is that? it does the same function as a BOV that would vent into the atmoshper. explane to me why it wouldnt work.

and if i do get a HKs ssQv what do i do with the open hole on the intake side before the turbo. how do i cover it?

 

or does it go in a compleatly different spot then the stock bypass vaulve?

 

Yes. The method you've mentioned will work. I would sometimes run my VW that way and, honestly, I thought it sounded better than a lot of BOV's out there. My DV was an aftermarket though.

But, running that way could cause performance problems. The main problem is that most stock DV's don't fully close at idle and that causes stalling and rich idle conditions. On my VW I could adjust the spring tension of the DV to help it stay closed, but still had to run with the MAF unplugged to keep the car from stalling. I don't think you can run an Evo that way.

 

so if i were to try it what the best way to plug the hole where it was dumping the air back into the intake?

or would it be best to get a small cone filter and but it over the hole and leave it open?

 

I had purchased a BOV for my VW and it came with a rubber plug for the intake opening. I've heard of people making them from PVC fitting from the hardware store, but I don't know what they use. I guess you could put a small filter on, but the air coming through would be unmetered and would likely make the rich idle condition worse.

 

k thanks a ton


Im bored today and have nothing to do so im gona try it out


see what happens but im not gona run it like that just for the sake of not messing something up.

but question for ya
if i got a BOV that dumps into the atmosphere wouldnt i have the same problem of running rich at idle? how do i correct this? is there any way besides a tune because the closest AWD dyno is like 6 hours away.

 

The main reason that you'll run rich at idle is if the valve doesn't stay closed at idle. The is due to the vacuum differences pulling on the piston and low spring tension. With an aftermarket valve, the spring tension is adjustable so you can tighten the spring until the valve closes at idle. However, setting the spring too tight could cause issues with the valve's ability to vent when you let off the throttle which it's its main and most important purpose.

The most effective way to get the sound you're looking for and keep the car happy is to get a dual-vent DV/BOV. There are many available on the market. This will let you recirculate enough air to keep idle nice but still vent to atmosphere when you release the throttle. Some are also adjustable to change the ratio of venting and diversion.

You won't necessarily need a tune if you can get the valve to close and open correctly. You will still swing rich when you let off the throttle for just a brief moment, but that won't really hurt performance.

No matter what you do, a MAF controlled system will not run at 100% with a VTA valve. This is simply due to the air being metered before the vent occurs and the ECU doesn't know when or how to compensate.

 

I have a forge atmos. BOV and I dont have any probs. I had a guy from forge installe it and ajust the stiffnes of the spring. Ur gonna run a tad bit rich at idle but its good to run a bit rich with a turbo car. Remeber I said just a "bit" rich

 

Get a 9 Metal DV and an Intake, With my ARC box the stock valve is loud enough and functional

 

I have a forge recirc BOV and I can still hear it quite good! When I accidentally damaged the factory recir. BOV I had to use a VTA BOV and my car eventually started to run like crap! What I did at the time to plug the hole where it use to recirculate was use these rubber caps you would buy in a hardware store to put on the bottom of bar stool etc. Worked great and didn't look bad. I would suggest recirculating though if your car is not setup to vent outside. My car has been running great since adding the forge. Here's a link to the BOV installed on my car https://www.evolutionm.net/forums/sh...d.php?t=273303

 

tryd it out yesterday.Didntwork to good i couldnt hear it any better.but it was fun to tinker with the car!

so which BOV do u guys sugjest. is there any out there that recurculate and are easyto install with out the need to swap pipes or do any welding?

 

the jdm mr bov, or the evo 9 bov.