BOV vs. Bypass Valve...?

[seattleMS3]

i have an 08 ms3. i have the injen CAI as well. now im thinking of installing a BOV or a bypass valve. ive heard better things about bypass though. what do you think? any specific models as well would help. thank you

 

[john blutarski]

Yes a recirculating valve is the best for this car (at least when using the stock ECU). The Forge BPV is by far the best bang for the buck full recirc BPV out there.

 

[mattj3636]

john travolta has a forge bpv on his speed3

 

[seattleMS3]

john travolta has a forge bpv on his speed3

really... is this a joke?

 

[coyfish]

Get a bypassvalve unless you want to deal with possible backfires / stalls. This has been discusses quite a bit in the forums. BOV's shouldn't cause any long term issues . . . so its "ok" to run them. For performance get a bpv. IT makes the ECU happy. You could always get a BOV with a recirc fitting so you could run VTA when you want.

 

[mattj3636]

no, travolta really has a speed3 with a forge bpv, ill try and find the article

 

[AAMguy]

its called a SEARCH button or heck just look up and down the forced induction or engine forums.... BUT!

There have not been significant amounts of problems with BOVs. Aftermarket BOVs can and do require some light end user maintenance to keep them performing perfectly. For aftermarket hybrid BOVs that have end user defined settings, there will be an initial period of adjustment to obtain the desired recirculation/atmospheric ratio. As well, most aftermarket BOVs will require "tuning" (usually via supplied washers, a screw, or other mechanism on the BOV itself) to allow them to idle correctly and blow off at the right time.
The downside of releasing the air to atmosphere is that it has already been metered by the mass air sensor, and when it blows off, the ECU will be injecting the wrong amount of fuel into the cylinders. The engine temporarily runs extremely rich, meaning too much fuel is injected into the cylinders.

This temporary rich condition isn’t usually that harmful, but it can cause bucking or hesitation on lift-throttle. If the condition is really bad, it can eventually foul spark plugs and even clog the catalytic converter as unburned fuel on the catalytic converter burns very hot, and too much of it can melt the cat.

 

[mattj3636]

You're so smart AAMguy

 

[AAMguy]

i try

 

[Jasnall]

It must be said, you can buy a BOV and run it in full recirculation, thus basically making it a BPV.

 

[mazda3rev]

ok the hell with the ford focus with the v8, its a piece of crap, and i'm not saying my 4g63 engine swap is the best in the world, but please tell me who you know has done that swap, ummmmmmm. Mr. gray, the answer is nobody, now you can't lie you see that engine in the mazda 3, the only thing you can say is 4g63 NO s*** lol so whoever has a great imagination, hit me up

 

[mattj3636]

wrong thread man

 

[john blutarski]

ok the hell with the ford focus with the v8, its a piece of crap, and i'm not saying my 4g63 engine swap is the best in the world, but please tell me who you know has done that swap, ummmmmmm. Mr. gray, the answer is nobody, now you can't lie you see that engine in the mazda 3, the only thing you can say is 4g63 NO s*** lol so whoever has a great imagination, hit me up

:wtf:

 

[mattj3636]

theres a thread about engine swapping thats erally ridiculous..haha

 

[ElSpeedDiablo]

Yeah pretty much a newb when it comes to bovs I was thinking of buyin a turbo dual bov, it can be run to full recirc. I laos found out that you need to have an intake inorder for it to work properly it wont work with the stock airbox, anyone have any info on this. Thanks!!!

 

[Jasnall]

uhhhhhh, an intake should have no effect on whether a bov/bpv works. I know without an intake your wont really hear the bov/bpv, but they will still work

 

[seattleMS3]

i got the forge BPV. thanks for the input. any ideas what should be my next mod?

 

[coyfish]

If you want power for now definately the test pipe. Cheap, easy to install, good gains. You could also try a rear motor mount which makes shiting easier and eliminates the nasty 1st >2nd gear bang. Those 2 are a good place to start. More expensive mods really depend on your particular goals.

 

[mattj3636]

next mod should be a complete engine swap / drive train conversion for a chevy 350 small block and blow it.