:::RHMT::: Real Home Made Turbo

General Category => Forced Induction => Topic started by: imburne on April 06, 2012, 12:31:24 PM

Title: BOV not going pew pew.. Why?
Post by: imburne on April 06, 2012, 12:31:24 PM: So my cdm Bov I dont believe is opening at all. I am using a open port in the back of the skunk 2 manifold dedicated just for it. Am I suppose to put a check valve in there or something? I have not boost leak tested the system yet to see for leaks though.

Thanks for the input
Title: Re: BOV not going pew pew.. Why?
Post by: ratcityrex on April 06, 2012, 01:05:42 PM: Dude, your such a rookie. It seems like your posting more noob questions than the noobs. And you own turbobyholset? ...lol
Title: Re: BOV not going pew pew.. Why?
Post by: imburne on April 06, 2012, 01:47:48 PM: Oh yeah for sure I am still a rookie. Although I did a build already it was about 5+ years ago and I am pretty rusty.

I have it apart currently for some upgrades so I cannot check it right now. I will in a about a week when I am finished with it though.
I was about to update the build thread and it tells me its over 120 days old and I should consider making a new thread :?:
Title: Re: BOV not going pew pew.. Why?
Post by: 92CXyD on April 06, 2012, 01:50:35 PM: Quote from: imburne on April 06, 2012, 01:47:48 PM
Oh yeah for sure I am still a rookie. Although I did a build already it was about 5+ years ago and I am pretty rusty.

I have it apart currently for some upgrades so I cannot check it right now. I will in a about a week when I am finished with it though.
I was about to update the build thread and it tells me its over 120 days old and I should consider making a new thread :?:

Just update the thread anyways. :noel:
Title: Re: BOV not going pew pew.. Why?
Post by: ratcityrex on April 06, 2012, 02:18:48 PM: Well, how many ports does your bov have? Also which port to you have your vacuum line hooked to? Does it have a adjustable bolt on the top to set spring pressure?
Title: Re: BOV not going pew pew.. Why?
Post by: imburne on April 06, 2012, 02:58:48 PM: Build thread updated with some info.. boring now but it should get good soon.

The bov only has one port to connect to. I directly connected it to a port that was previously blocked off on the intake manifold (meaning there is nothing teed into it).

It has an adjustable bolt on the top and at first I tightened it slightly, then just by hand with nothing changing. I never tightened it down all the way because it was already stiffer than shit when I pushed on the bov to open it by hand.
Title: Re: BOV not going pew pew.. Why?
Post by: 92CXyD on April 06, 2012, 03:01:53 PM: Quote from: imburne on April 06, 2012, 02:58:48 PM
Build thread updated with some info.. boring now but it should get good soon.

The bov only has one port to connect to. I directly connected it to a port that was previously blocked off on the intake manifold (meaning there is nothing teed into it).

It has an adjustable bolt on the top and at first I tightened it slightly, then just by hand with nothing changing. I never tightened it down all the way because it was already stiffer than shit when I pushed on the bov to open it by hand.

What BOV are you using? :noel:
Title: Re: BOV not going pew pew.. Why?
Post by: imburne on April 06, 2012, 03:50:00 PM: CDM Greddy RS Replica
Title: Re: BOV not going pew pew.. Why?
Post by: ratcityrex on April 06, 2012, 05:37:42 PM: Back the bolt all the way out and give it 1/2 turn back in and then set it. It should make some noise or queef or something. Now this is when the engine has a load on it. If your parked just free reving it probably want make boost because there is no load. You must be driving to her the bov fart.
Title: Re: BOV not going pew pew.. Why?
Post by: Cmak on April 07, 2012, 03:12:12 AM: Usually the springs in the CDM valves are weak as shit, recently had to put a stack of quarters inside one on the dyno to get it to go past 12psi without blowing open.
Title: Re: BOV not going pew pew.. Why?
Post by: HiProfile on April 07, 2012, 10:03:23 AM: Tee off any other car's vacuum lines to the BOV, then rev the engine a few times to see if it opens. It should at least try to move when you let off the throttle suddenly.
Title: Re: BOV not going pew pew.. Why?
Post by: Aero on April 07, 2012, 01:27:38 PM: Torn diaphragm is a possibility if you haven't checked it yet.
Title: Re: BOV not going pew pew.. Why?
Post by: SloS13 on April 10, 2012, 05:38:06 PM: Quote from: Aero on April 07, 2012, 01:27:38 PM
Torn diaphragm is a probability if you haven't checked it yet.

fixt
Title: Re: BOV not going pew pew.. Why?
Post by: PhilStubbs on April 10, 2012, 06:12:10 PM: The greedy knock offs usually have 2 springs. Open it up and take out the weaker one. The screw in the top does nothing.
Title: Re: BOV not going pew pew.. Why?
Post by: ratcityrex on April 10, 2012, 06:16:06 PM: Quote from: SecksyPeePee on April 10, 2012, 06:12:10 PM
The greedy knock offs usually have 2 springs. Open it up and take out the weaker one. The screw in the top does nothing.

I didn't know that. I have the real thing. So I'm just going off what I have.
Title: Re: BOV not going pew pew.. Why?
Post by: PhilStubbs on April 10, 2012, 06:25:12 PM: On the knock off the only thing that screw does is fill the hole. If you screw it all the way in it will limit how much it opens. That's about it.
Title: Re: BOV not going pew pew.. Why?
Post by: theidealone on April 11, 2012, 02:21:03 AM: Every CDM BOV Ive had never opens. Springs are WAY too stiff. So I always put a softer shorter spring in, and never have an issue again.
Title: Re: BOV not going pew pew.. Why?
Post by: PhilStubbs on April 11, 2012, 06:48:11 AM: They are always different for me. My last rs knock off needed the stiffer of the 2 springs. The weaker spring let it open at 4psi
Title: Re: BOV not going pew pew.. Why?
Post by: PhilStubbs on April 11, 2012, 09:59:16 AM: I have yet to see an RS or type S knockoff that preloaded the spring. I have had my hands on hundreds. Literally.