boost/vac source for Blow off valve-

rdeaner · Stage 2 Joined: 03 Jun 2008 Posts: 72 Location: Lubbock Tx

Can you have too little size hose for the reference pressure going to the bov?? I redid my hose-lines a while back and just noticed the other day that my bov chatters. Instead of a straight pffffssh... it sounds like cha-cha-cha-cha-cha. I've checked for leaks and I have none- up to 17psi. I'm running around 20ish.. But it chatters at any boost pressure... If I'm in higher boost and then let off the gas, it makes a very short pfffshh and then immediately to the chatter. Before I had larger tubing going to the bov and it just pffffsshhh with a tiny bit of light chatter at the end... My vac line comes off the manifold 1/4in tube and then spits into a T with one side going to Fuel Pressure regulator and the other going to the bov.. Both of those lines are 1/8 or maybe a tiny bit smaller.. ~3/32" tubing... whatever fits tightly on a 1/8in male fitting. Its a soft line also so I thought maybe along with the heat it could be collapsing-

It didn't start doing this till I got on it hard the other day and after I heard it. I think I just answered my own question but feedback would be great!
_________________
The non-import "import"

PanteraTurbo · Stage 2 Joined: 17 Apr 2008 Posts: 58

I have only just got into the BOV thing but I would imagine too small a hose will affect BOV reaction time. As far as the chatter goes I would think it might have something to do with the valve itself getting a bit dirty and not sliding freely within the bore. Once again this is purely a guess.

Blaine

rdeaner · Stage 2 Joined: 03 Jun 2008 Posts: 72 Location: Lubbock Tx

thanks- I'll disassemble it and make sure its clean while looking for defects/probable causes-
_________________
The non-import "import"

phat95nosdsc2 · never say die Joined: 17 Jun 2008 Posts: 19

Usually the flutter you hear is from the spring tension, I think being to soft, if I recall correctly.

What kind of bov is it? And is it a plastic T or a metal one, ive had problems with the plastic T's melting shut.

rdeaner · Stage 2 Joined: 03 Jun 2008 Posts: 72 Location: Lubbock Tx

Melting shut??? dang.. My T's are on the intake side so not much heat. My experience is that: if the spring is cranked up then this puts more pressure on the diaphram and requires more pressure from the charge pipe to open, thus flutter.. If its set low it will open more easily and stay open making the ppffffssshh sound. Its an HKS SSQ... I want to swap it out with a tial 50mm and be done with it but can't do it yet. Anyway thats why I was thinking it had to do with the lines collapsing or something wierd. Hopefully I can get it off the car by this weekend and troubleshoot the current setup-
_________________
The non-import "import"

phat95nosdsc2 · never say die Joined: 17 Jun 2008 Posts: 19

Yes, melting it. I have this wierd problem, where if something can go wrong, it deffinetly will.

I have the same bov, there is the bolt/locknut on the back of it, loosen it up some, and see what happens.

Good luck
JW

rdeaner · Stage 2 Joined: 03 Jun 2008 Posts: 72 Location: Lubbock Tx

^^^I drive a dodge... so I'm in the same boat.

Thanks guys, like i said I'll check it out as soon as I get out from underneath this mountain of homework- You would think that being in college for 09 yrs that it might get easier... but it doesn't- people are starting to call me a "lifer"
_________________
The non-import "import"

PanteraTurbo · Stage 2 Joined: 17 Apr 2008 Posts: 58

Turbosmart also makes some very nice BOV's.

Blaine