BOV vent to atmosphere[p5]

[Equinox]

How bad is it, on an MP5-T to completely vent to atmosphere? Is anyone doing this? How about you mazdaspeeds. I've heard of high RPM stalling when pulling out into neutral. Is it driveable? My turbo system I wont be able to drive until tomorrow, but I will be using an Turbo XS RFL BOV, and wont have the option to recirculate

 

[atila]

I don't know for your generation but on the first gen there's no real trouble. Normally it should not make any difference you just need to adjust it so that it's only open to release the boost not when your just on vaccum.

 

[dominoy2k1]

well on my mp3 it doesnt stall after shifting but the rpms will drop and bump back up. i do have a blitz, so i dunno if itl makes a diff.

 

[YP5 Toronto]

Hiboost kit...vents to atmosphere... but the kit uses a MAP sensor...

 

[TX Speed Demon]

I've been running the type s for about 5 months with no problems after adjusting the valve spring. If you BOV is adjustable, just tighten it up so it doesn't stall. If not, you may want to upgrade to an adjustable one like the Greddy Type s or HKS super Sequential.

 

[Equinox]

I've been running the type s for about 5 months with no problems after adjusting the valve spring. If you BOV is adjustable, just tighten it up so it doesn't stall. If not, you may want to upgrade to an adjustable one like the Greddy Type s or HKS super Sequential.

Adjustable how?

Like this?: It has a spring in it where I can open the top and add washers under the spring, this will cause the spring harder to open, and require more boost to open the BOV.

So you are saying, I only want the valve to vent to atmosphere, at say, max boost? (6 psi?)

(funny thing is, I need to cut the spring first to get it weak enough to open at atleast 6psi, minimal for the spring I think is 10psi)

 

[torque222]

How bad is it, on an MP5-T to completely vent to atmosphere? Is anyone doing this? How about you mazdaspeeds. I've heard of high RPM stalling when pulling out into neutral. Is it driveable? My turbo system I wont be able to drive until tomorrow, but I will be using an Turbo XS RFL BOV, and wont have the option to recirculate

i have the turbo smart dual port bov, recirculating and venting into the atmosphere on my msp.... all swoooooooooooosh, no stall

 

[Equinox]

i have the turbo smart dual port bov, recirculating and venting into the atmosphere on my msp.... all swoooooooooooosh, no stall

yeah I've seen a lot of people run 50/50, venting some air, recirculating some air. Also, people using the stock BPV in conjunction with an BOV.

I wonder how much the stall problem will affect my quarter mile. Well not stalling problem really, it's actually just flooding your engine. I'll probably foul a plug quick though.

 

[mp5jeff]

i raised my idle like 6 months ago, never had a problem stalling since...raised it to around 850-900..

 

[Equinox]

i raised my idle like 6 months ago, never had a problem stalling since...raised it to around 850-900..

I'm worried moreso about the loss of revs, and not the actual stalling, IE, will I lurch on the highway when shifting?

 

[02p5]

HKS SSQ on mine with no problems once so ever. I raised the idle by 100-200 rpm and tightened the BOV.

 

[mp5jeff]

I'm worried moreso about the loss of revs, and not the actual stalling, IE, will I lurch on the highway when shifting?

nah..at least i don't, and if you get an adjustable bov it can be better, mine doesnt even adjust cuz its a bad hks, and i have no problems...

 

[low_psi]

nah, the venting isn't that bad. nothing to worry about. unless you throw it into nuietral at high revs(like stated) or start BOVing in nuetral in a parking lot, for example, you won't have issues.

 

[mp5jeff]

i can redline mine in nuetral and it still wont staul, it will drop revs a bit but come back up after a second or two.

 

[low_psi]

yea, it just depends how rich your car is running. once you get near redline the fmu should be leaning out the fuel a bit so the motor won't get the same amount of excess fuel once it dumps. can you rev to 4K and be fine? it seems like its 50/50 with that kind of stalling.

 

[Notorious]

my car runs overly rich. With greddy type s loosening the valve will make it stall real bad. Tightening it creates crazy surge. It is currently recirc, and there is still some surge (just because my fitting is about the same size as the stock one) until I get a chance to make a real fitting.

 

[A.V.MSP]

I have the RFL with 3 washers and does fine with stock boost. Im venting also, it use to stall then got really bad when I got my harpipes and FMIC so I just moved my MAF to the intercooler pipe that connects to the TB