1g BOV leaking?

[mini zilo]

I think my 1g BOV may be leaking. I have absolutely ZERO boost leaks. When I get on the gas, the boost starts building, and right around 4500 RPMs, the a/f just SINKS down to 10.0 (the lowest reading) and the car starts studdering and popping. It is not my plugs, I just bought new ones a few days ago. It's not my wires, I already tested that. I think my UN crushed 1g bov might be really old and leaking. Sometimes I can hear air escaping when the boost builds... and I have no leaks, I'm positive. So can it be that? Have they ever been known to leak at only around 15 psi?

(the bov is UN recirculated... I know it is bad, but it should not matter in this case. I am automatic btw.)

 

[oldman]

I think my 1g BOV may be leaking. I have absolutely ZERO boost leaks. When I get on the gas, the boost starts building, and right around 4500 RPMs, the a/f just SINKS down to 10.0 (the lowest reading) and the car starts studdering and popping. It is not my plugs, I just bought new ones a few days ago. It's not my wires, I already tested that. I think my UN crushed 1g bov might be really old and leaking. Sometimes I can hear air escaping when the boost builds... and I have no leaks, I'm positive. So can it be that? Have they ever been known to leak at only around 15 psi?

(the bov is UN recirculated... I know it is bad, but it should not matter in this case. I am automatic btw.)

What makes you think it won't matter?

1. You're pulling in un-metered air during idle and part throttle since the spring pressure for a 1G BOV is around 8psi, this means anytime your vacuum reading exceeds -16 inHG, the BOV will open.

2. A 1G BOV will typically start leaking at around 16ish psi.

3. If your MBC is T'ed off the BOV line, all bets are off, MT or AT.

4. Not all roads are straight, the negative effects of losing metered air when ever you blow off still applies, your car will feel sluggish with increased spool up time when you get back on the throttle, road course/autoX for example.

 

[92dsmtalon]

They sometimes start to leak at 16psi, but not always, I had mine running 21psi and held just fine. But if its leaking while your building boost your bov might be going bad.

 

[oldman]

They sometimes start to leak at 16psi, but not always, I had mine running 21psi

An un-crushed or un-modified (DG) 1G BOV holding 21psi is impossible but it's an exception, not the norm. If leaking at around 16psi means it's bad then most 1G BOV's are bad. Did you actually tested the BOV or are you saying you're running 21 psi? Mine leaks at 17psi without the lower fitting (DG mod) hooked up (only hooked up at the track due to low boost flutter that comes with crushed or modded 1G bov) and I'm running 24-25psi daily recirculated.

 

[92dsmtalon]

An un-crushed or un-modified (DG) 1G BOV holding 21psi is impossible but it's an exception, not the norm. If leaking at around 16psi means it's bad then most 1G BOV's are bad. Did you actually tested the BOV or are you saying you're running 21 psi? Mine leaks at 17psi without the lower fitting (DG mod) hooked up (only hooked up at the track due to low boost flutter that comes with crushed or modded 1G bov) and I'm running 24-25psi daily recirculated.

Well, Im at 17psi right now with no leaks, and I was running 21psi for a few days when I went to the track, but mine is crushed, so I suppose that would be the exception.

 

[oldman]

Well, Im at 17psi right now with no leaks, and I was running 21psi for a few days when I went to the track, but mine is crushed, so I suppose that would be the exception.

Well, you have better be holding at least 21psi if it's crushed.

 

[92dsmtalon]

Lol, yea, it doesnt matter to me though, I just got a Turbo XS Type H, just need to put it on.

 

[talonalex92]

My turboXS BOV, was awesome. I loved it and everyone else gave me crap for it. To test yours, I would hook a vacuum pump up to it and see what it does, that would help tell if its leakin.

 

[92dsmtalon]

Yea, dont you have to take them apart and put washers on the spring to adjust them?

 

[talonalex92]

I think thats how its done, I never had problems and it was boostin 18 psi.

 

[92dsmtalon]

Coolness.

 

[talonalex92]

Yeah, I had the Type H/RFL. It sounded like a gunshot. Amazingness, youll like it.

 

[mini zilo]

What makes you think it won't matter?

1. You're pulling in un-metered air during idle and part throttle since the spring pressure for a 1G BOV is around 8psi, this means anytime your vacuum reading exceeds -16 inHG, the BOV will open.

2. A 1G BOV will typically start leaking at around 16ish psi.

3. If your MBC is T'ed off the BOV line, all bets are off, MT or AT.

4. Not all roads are straight, the negative effects of losing metered air when ever you blow off still applies, your car will feel sluggish with increased spool up time when you get back on the throttle, road course/autoX for example.

1. I think it wont matter because I am talking about when I go WOT. I don't give a rats ass about air coming out -16 inHG, or a bad idle (which I dont have). I hear a LEAKING NOISE when I am BOOSTING, and its not my piping, thats for darn sure.

2. Alrighty, thank you.

3. It is not, I did take a look at your thread on how to hook it up right.

4. Yes, but, I dunno.

 

[oldman]

Yeah, I had the Type H/RFL. It sounded like a gunshot. Amazingness, youll like it.

Seriously, stop telling noobs to vent with the stock MAF, that is if you care about not receiving negative rep points. In case if you didn't get the point last time around when people give you shit for it, serious DSMer's don't care about how a BOV sounds, rather it's how it functions. Go talk about your F&F fascination some where else before you get the thread closed.

 

[diddy456]

Stop trying to make it "sound cool" and do it right. Oldman is very wise about these car's he isn't telling you this for nothing.

 

[m_0ney_pit]

My 1g BOV leaks out of the port also. When I pressurize the system and BLT to 16 psi, if I put my palm over the 1g BOV outlet I can feel pressure against my palm building withing 3-4 seconds and then after about 10 seconds if I reduce the pressure of my palm against the BOV outlet I can hear air escape from the chamber. It seems to be a rather slow leak but I was wondering if this is normal?

It was alot worse ...maybe 1 psi/sec leak but I tried to clean the mating surface between the piston and the base with a peice of cardboard and removed much old builtup oil and garbage deposits...now the leak is at the state described above.

 

[talonalex92]

Seriously, stop telling noobs to vent with the stock MAF, that is if you care about not receiving negative rep points. In case if you didn't get the point last time around when people give you shit for it, serious DSMer's don't care about how a BOV sounds, rather it's how it functions. Go talk about your F&F fascination some where else before you get the thread closed.

Well, I didnt tell him to vent. I told him how I liked mine, and I was venting properly so im ok with that. Also, I didnt even say anything to the thread starter, just some random guy that chimed in about a turboXS product. Thanks.

 

[oldman]

My 1g BOV leaks out of the port also. When I pressurize the system and BLT to 16 psi, if I put my palm over the 1g BOV outlet I can feel pressure against my palm building withing 3-4 seconds and then after about 10 seconds if I reduce the pressure of my palm against the BOV outlet I can hear air escape from the chamber. It seems to be a rather slow leak but I was wondering if this is normal?

That is normal for a virgin 1G bov and it's a real issue that needs to be addressed either through crushing or DG modding, here is an awesome article on the ins and outs. http://www.dsmtuners.com/forums/showthread.php?t=220909

Well, I didnt tell him to vent. I told him how I liked mine, and I was venting properly so im ok with that. Also, I didnt even say anything to the thread starter, just some random guy that chimed in about a turboXS product. Thanks.

You're forgetting that these posts are open to anyone to read and interpret. We work very hard around here to encourage doing things the right way for the right reasons, this site is about performance, not the perception of performance. Issues like this is what separates true car enthusiasts from wannabes, you can choose to run your car however you want, just keep it to yourself.

 

[talonalex92]

That is normal for a virgin 1G bov and it's a real issue that needs to be addressed either through crushing or DG modding, here is an awesome article on the ins and outs. http://www.dsmtuners.com/forums/showthread.php?t=220909


You're forgetting that these posts are open to anyone to read and interpret. We work very hard around here to encourage doing things the right way for the right reasons, this site is about performance, not the perception of performance. Issues like this is what separates true car enthusiasts from wannabes, you can choose to run your car however you want, just keep it to yourself.

I completely agree and support that thought and this forum. Im encouraging to do right. I gave the thread starter an idea on how to test his BOV and then I gave my opinion on the one that I had. I dont support improper venting. I dont really support it at all.

 

[m_0ney_pit]

Would crushing a 1g BOV make a difference under at or under 10 psi? I ask because I am running 7-10 psi (set for 7 but varies up to 10 depending on gear) and I would like to try to eliminate all my leaks no matter how small before I hit the dyno. I took a look at dejon's test data for the leak stop kit but it didn't include my psi range.

I want to avoid the guss mod because I don't like the drivabilty with the lower port not connected, I ran my type-s like that and it only gave good results at high throttle under boost.

 

[oldman]

If you're running only 7-10 psi (any reasons why you're running so low since your stock fuel system is capable of supporting at least up to 15psi?) and your BOV starts to leak at 16psi, what's the problem?

 

[m_0ney_pit]

I have my wastegate acuator hooked right up to my boost source to get 7 psi most of the time. Its a big 16g with a 2.5" o2 and 3" downpipe and a front mount so I get up to about 10-11 psi in 4-5 gear when I'm pulling. Its a 4g64 with 9.5.1 compression, so I'm running low boost until I get some nice wiseco's in the block.

Well there isn't any problem with the way the car drives, its perfect lots of power but I'm just trying to make sure my blow off valve isn't making me loose power. And I want to do what ever I can to fine tune my setup.
I tried the greddy type-s and hated it because it wasn't as drivable as the 1g is even though it definitly doesn't leak as much as the 1g because it has that nice rubber ring on the piston to seal to the base.

Question is, if I crush my 1g will it stop all leaking under 21 psi or will it still leak some even crushed?

 

[oldman]

Technically speaking, it should hold 21+psi. However, just like everything else, every car, every BOV and every crush attempt will be different, the only way to know is to try and test. Personally I prefer the DG (guss) mod because it seems more civil and is reversible.

 

[2gntrbo]

thank you oldman for the link for "how to crush our BOV" i did it last nite and now i can hold 20psi. thanks for those again.