BOV leaking

[Emode]

Just have a quick question. Just installed ion fmic kit with dual bpv/greddy bov combo. Works great, no turkey, etc. I currently have it tightened almost all the way down, but I have noticed that if im am higher up in rpms and let off throttle to ride the gear down, as i near the 2000 range I think I here the BOV leaking, even though its in full vacuum.Is this normal, cause I dont really know how much more I can tighten . Also the ion kit is kind a pain to get in, didnt cut one hole big enough and had to take it apart again. Has to be adjusted just right to get it to fit, but its really nice now that its in.

thanks for any help

 

[Aricjm15]

OHHH ROB, why didnt you tell us!?!?!?!?!, ahh now I know why you didnt come to the track the other night
now you most definately must come on the 15th

 

[Emode]

nobody has any thoughts on this???

 

[Spicy1390]

Check your vac source that your BOV is hooked up to. Sometimes the line that your boost gausge is on is diff then your line that has your BOV on it. Check all of the fitings. I had the same issue, and found out that the type s needs a smaller diameter vac hose then the stockers are right now. It was leaking in air into the system and chattering a little. I had to get a better t fiting to accomodate the two diff size hoses. Hope this helps...

 

[Emode]

currently im running them booth off the brake booster line and using the hose that came with the greddy kit. Plus its happening in vac which is why its coinfusing me. Seems to be a tight fit everywhere but ill double check

 

[Spicy1390]

Keep in mind that our cars have s hit load of vac pressure. I think I am seeing like 21 vac or something. It is kinda a b****, but you kinda have to check all of your lines also. It might be leaking anywhere in the system. Remember that a blow off is made so that when there is a pressure change it will open, or "leak". How does your BOV sound that tight? Mine sounds like crap when I over tighten it..

 

[Emode]

it actually sounds really good, all whistle and whoosh, no turkey at all
Im just confused about the leak, its definately coming from the bov, and it only happens in the 2300-1900 range in every gear. I watch the vac reading the whole time and it doesnt change, the sound just happens.

 

[Emode]

and yes aric I will for sure be attending the 15th track session, we need alot of people to show up and have a good time.

 

[Notorious]

keep in mind the vacuum vs pressure equation is really slanted on our cars. You should be running about 20-25 in vacuum yet most msps will rarely pass 10 psi. So you'll leak more easily under a vacuum condition than boost condition. Cars that are more balanced are able to tighten the spring or loosen it with a lesser chance of it opening on one extreme. Hope that makes sense, im pretty drugged up here. just had wisdom teeth removed.

 

[Emode]

lol, sounds like fun

anyways i have a greddy boost guage and it reads vac in mmHg or something like that, so im not quite sure what that translates to in psi, but im pretty sure its still the same as before I did the fmic. Usually stays around 575-600 when off throttle, rolling down through the gear.

 

[jeffmsp]

i have the same problem with my Forge BOV. On the highway cruising at 140km/h it is constantly leaking (4800rpm) and the car just starts bucking like hell. I wonder if it has something to do with the spring rate.

 

[Emode]

what line should i have that secondary source on the type s connected to? I heard its supposed to only see positive pressure but im not sure.

 

[Notorious]

Keep in mind when you do roll through gears when coming to a stop your vacuum will be strongest then. If you hook up the secondary vacuum source I think you will open up under vacuum easier. As for the positive pressure there is not line that only produces positive pressure, unless you add a check valve and expand on an existing line. If you leak a little bit under vacuum it'll be ok, even though its not desirable. Unless you run into drivability issues and stalling issues I would leave it alone. If you do hook up the secondary source let me know how it works out for you. I didn't have the chance to play with it.

 

[CasopoliS]

I just ran a similar setup with the HiBoost kit. I have no leaking issues, or vac issues. I tapped the BB line for both valves. All connections have hose clamps. Don't have much more to say other than what has already been said....check all your connections....get good vac sources. I just made a new thread in this FI forum "HiBoost install - Greddy Type-S + BPV"
Good luck man. You ever get a very little bit of turkey at the beginning of your blow-off?

 

[Emode]

okay i tried putting a line on both vac bungs and it wasnt good. Nothing but compressor surge no matter how loose it was set, although the leaking sound was gone so it must be coming from there. Went back to single lines for each bpv/bov and Im gonna keep it like that. There is no noticable performance loss from the leaking, just happens while coasting so i dont care.

And to casopolis,i do get a little surge when shifting at like 0-3 psi. Sounds like buc-buc-sshhhh, but anything above that and its crisp clean whooosh to whistle

 

[CasopoliS]

Cool....I think everyone running dual gets that. I get 1 "buc" as you put it....not noticable. By by turkey.

 

[Rich24km]

my greddy will whistle just a tad almost like the sound of breaks that make the whistle sound. But it isn't that loud at all. But it just started doing it when it got cold? I was confused cause i left for vegas with no stalling at all. I come back and drive my car again and it stalled like a b**** as soon as i pumped the breaks. So i tightened the Greddy type s 2 full turns, and the stalling stopped but it still whistles a little if i'm going down a hill around 3000 rpms and am not hitting the gas. But it stops below 2,000 or if i put in the clutch.

 

[Emode]

yeah that sounds exactly like mine, i too noticed it seemed like it got louder once it got colder for some reason

 

[CasopoliS]

yeah that sounds exactly like mine, i too noticed it seemed like it got louder once it got colder for some reason

Mine does not quite sound like that....but close I guess. At night it seems louder but I just figured it was becuase sound travels better at night....and there are less cars. Who knows. Air gets more dense as it cools, so it weights more. Maybe BOV sound changes will occur becuase you are moving the same volume of air through the BOV, but NOT the same mass of air. Just an idea.