BOV question

[black91turbo]

hey guys! I was talking to my buddy who has an mr2 and he made an interesting point about BOV. The BOV releases the air that did not make it in to the engine, however, the AFM meters all of the air coming through the intake, including the air released by the BOV. So when the AFM determines how much fuel is needed to supplement the air, you have more fuel than air in the combustion chamber. So by having a BOV instead of a bypass valve are you actually causing your car to run rich??? So in theory cars with an AFM should use bypass valses instead of BOV?

 

[souprat]

absoultly correct. when running an afm with a vented bov you run rich between shifts, and have a hard time idleing becuse bov's are partway open at idle causing them to leak in some unmetered air. in the referance section there is a writeup on this "what happens when you vet to the atmosphere" or something like that.

 

[black91turbo]

absoultly correct. when running an afm with a vented bov you run rich between shifts, and have a hard time idleing becuse bov's are partway open at idle causing them to leak in some unmetered air. in the referance section there is a writeup on this "what happens when you vet to the atmosphere" or something like that.

How much power will the stock bypass valve hold???

 

[T34418L3ONE]

not much, your best bet is to search for the Bosch 110 BOV. itll hold anything the stock turbo can throw at it and goes in the stock location.

 

[black91turbo]

not much, your best bet is to search for the Bosch 110 BOV. itll hold anything the stock turbo can throw at it and goes in the stock location.

Is there an aftermarket BYPASS valve i can get that will bolt up to the stock location?

 

[NickSupra]

The bosch part is about as close as youll get. I believe some other aftermarket bovs have been adapted to the stock nipple, on the 3000 pipe. Check the prices though, the bosch is pretty cheap, and proven to hold lots of boost.

 

[Jspec7m88]

Understand you are not limited to the Bosch (although Bosch is a great choice to go with when upgrading)...However, once you start talking serious business (Bigger turbo, fuel system, basically more boost)...There are PLENTY of BOV's out there that you can recirculate. For example, the HKS SSQV, very popular, they have a recirculating kit for that...so there are many other ways to go if need be.

Jeff

:NINJA EDIT:
Notice my motor in my sig, I'm using the SSQV. Recirculated? No. But when I had my stock pipes, I still used the little nipple hole before the 3000 pipe for the SSQV. The flange I have is designed with the nipple on the end (as they were talking about) that you can use.

 

[NickSupra]

Good point. You are correct about aftermarket bovs being able to be used in recirc. I just think that the bosch bpv are the best bang for the buck. Look ay mike malloys setup. He runs two bosch bpvs, and over 500 whp. Not bad for probably half what a ssqv costs. Its all personal preference though. :icon_bigg

 

[black91turbo]

thanks for the info guys....... I guess when i am ready i will just recirculate a BOV (Bosch)