Stock BPV to BOV hehe

[jeffmsp]

hey guys, i put my car almost back to stock for a trip to the you know where, and on the way home the car starts driving like ass. Ive driven crippled cars before so i managed to get her home ok. On the way I figured I must have blown off a hardpipe again, but to my surprise the car held boost,so it cant be the pipes. On the drive home (about 1.5hours from work to home in traffic with a stalling car lol) I am noticing that even though I took off my Forge BOV, Im getting a really neat pst while shifting (off throttle the car just dies) when I got home I found that the stock bpv had slid off the nipple and was venting to the atmosphere. Out of curiosity, I see people use 1stgen dsm bov pieces in there setup, would this work well enough for me? (maf will be after the turbo) believe it or not, I actually like the stock bpv venting more than my forge BOV, the forge is like psssssssssTT, this is just a clean psst. very short, nice and clean sounding, doesnt wake up the neighborhood kinda deal. planning on running 10-12psi daily, do you think the stock bpv will leak at these levels?

[DSMConvert]

crushed 1g will work fine for you...cheap as hell to get too....hmm you could run an uncrushed(stock) 1g bov but they tend to leak right around 13-14psi...

[b00sted]

wouldnt your car stall if you ran your bpv open vented?

[EvilMSP]

Sounds like most people have that problem. But some seem to not stall with vented bov's. Hard to say...

[BlkZoomZoom]

Put a dump valve on the end of the stock bpv...Sounds good and rarely stalls.

[505zoom]

Get in on the GB in my sig for the BoostSciences BPV. You can run it open vent without the driveability issues, and it would be good for the boost you want to run.:)

[peepsalot]

What's a dump valve do?

[EvilMSP]

Just a different name for our BVP I Believe

[peepsalot]

Well, that's what I thought, but why would you attach a BPV to the end of another BPV?

[EvilMSP]

No its a replacement for the stock one. THis one is better and more effecient than ours. So if you wanna have a dual setup for no turkey and no stall just like 505 there this is a good upgrade. Cause the stock one can't take higher psi's without leaking. That is the gist of what I got from this and other threads.

[jeffmsp]

wouldnt your car stall if you ran your bpv open vented?

typically, but i will be running the maf after the turbo, so no metered air will be getting released.

Get in on the GB in my sig for the BoostSciences BPV. You can run it open vent without the driveability issues, and it would be good for the boost you want to run.

I would get in on it, but I think I am done with buying car parts, after the FMIC I dont even want to think about spending more money for now, just tinkering with what ive got, learn some stuff as I go along kinda deal.

crushed 1g will work fine for you

What is this crushed people keep telling me? I was talking to one guy today who was saying I can "crush" my stock bpv so that the turbo is constantly spooling at like say 2.5psi or something so there is no lag? I heard of a local shop doing something like this so when their car launched it was already in full boost or something.

I think I asked one of the questions wrong, what i want to know is will the stock bpv work as well as a 1stgen dsm

[peepsalot]

No its a replacement for the stock one. THis one is better and more effecient than ours. So if you wanna have a dual setup for no turkey and no stall just like 505 there this is a good upgrade. Cause the stock one can't take higher psi's without leaking. That is the gist of what I got from this and other threads.
Ok, I understand there are replacement bpv that will perform better than stock. I was just trying to figure out what this post meant though. Still doesn't make sense to me.
Put a dump valve on the end of the stock bpv...Sounds good and rarely stalls.

[505zoom]

typically, but i will be running the maf after the turbo, so no metered air will be getting released.

DO NOT run the stock BPV open vent, even with that setup. You don't want unfiltered air getting into the system on a street car.

[jeffmsp]

but how would unfiltered air come in? I would cap off the hole on the intake behind the maf.

[505zoom]

but how would unfiltered air come in? I would cap off the hole on the intake behind the maf.

It won't come in there, it will come in through the valve itself at idle.

[peepsalot]

How is the stock bpv different from a bov that it would let air in at idle? I thought both will open when a vacuum signal is sent to it?

[505zoom]

How is the stock bpv different from a bov that it would let air in at idle? I thought both will open when a vacuum signal is sent to it?

Nope, the stock BPV will leak at idle. That is why the thread starter was having issues at idle when running with it open vent.

[JDM Sam]

Nope, the stock BPV will leak at idle. That is why the thread starter was having issues at idle when running with it open vent.
Word. its a flimsy piece of plastic, i think it came out the Mazda recycle parts bin off a rx7 turbo.

[peepsalot]

Ok, I did a little researching, and I think I understand it all better now.
I think the stock bpv could be used with no problems, if a large one way valve was simply connected to the end of the bpv. This seems to me that the combined valves would be open only when there is vacuum in the intake manifold, and also only when the pressure in the pipes are > atmosphere. I read that aftermarket bov's get around this venting at idle by using adjustable springs to only work at very high vacuum, but this supposedly also causes them to be slower to react. I think a one way valve on a bpv or bov with a loose spring would be the optimal solution. What do you guys think?

Now if I could only figure out where to find a such a valve.

[jeffmsp]

would a 1g DSM running open vent leak at idle? And if anybody knows more about this "crushing the bpv" the info would be greatly appreciated. (bow)

[peepsalot]

1) Not sure, but I don't think so?
2) The BOV's leak at pressures higher than 22psi, this will most likely not be a problem for 99.9% of proteges, therefore is unnecesarry. The crushing of the top of the bov compresses the spring inside, making it stiffer, therefore allowing higher than 22psi.
From here:
http://members.shaw.ca/costall/1000Q/Frameless/answers-minor.htm

[JDM Sam]

you wouldnt need to crush one for the boost you will run on a msp

[casper]

Can't crush the plastic BPV on our cars anyway. 1G BOV are metal.

[JDM Sam]

i believe he was talking about crushing a 1g dsm valve to use on his msp?

[jeffmsp]

well i guess crushing the bpv doesnt do what i was told it does. Thanks for the replies! Anybody else know if a 1gdsm bov will leak at idle? I am pretty sure I will go get one this weekend. The Forge BOV and turbo to IC pipe will be for sale shortly if anyone may be interested since I am getting the BEGI kit, the BOV works fine, but for me is just too much (funny because other members dont consider it loud at all) anyways what sold me on the forge unit is that you can swap it out very quickly if you need to go to the you know where (cool)