631 Teggy

Around 1-2psi, should the BOV flutter when i shift? It sounds like "tff tff tff tfff" or is that compressor surge I am hearing? The top port gets vacuum from my vacuum manifold along with wastegate and boost guage (which is T-d from the break booster).

TYIA

Here's a pic to help bring people in.



Modified by 631 Teggy at 9:03 PM 9/24/2006

2.4LAWDTalon

Your most likely hearing compressor surge, when the tial goes off its one solid noise

631 Teggy

Well that's not good. Why wouldn't the BOV be functioning properly?

JDMRice

try a different vaccum source.

631 Teggy

What's wrong with the current? I'll try another source though.

Would having the wrong spring cause the BOV to flutter?

JDMRice

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 631 Teggy &raquo;</TD></TR><TR><TD CLASS="quote">What's wrong with the current? I'll try another source though.

Would having the wrong spring cause the BOV to flutter?</TD></TR></TABLE>
yeah that could also be your problem, I had the same thing happen on my rfl, i didnt put enough spacers and the thing flutterd .

swappedcx

I hear that too on mine, and i know mine is hooked up right with the recirc and the vacuum source. Anything above 1-2psi is fine, 2 psi is actually good, but sometimes i hear that just driving in the city.

Maybe the BOV is too tight??? IDK i was going to mess with mine but never got around to actually popping my hood

631 Teggy

Better vacuum source, no different. It only flutters at low boost, Like just above possitive pressure (1-2PSI). How bad is it to have compressor surge with that boost level? I've been told it's not bad a t all.

Opinions?

AbitAvenger

i wouldnt worry about it

SOHC_MShue

mine does it too. Have you tried the 7psi spring in the bov?

631 Teggy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">mine does it too. Have you tried the 7psi spring in the bov?</TD></TR></TABLE>

No, I only have the 11psi it comes with. Where can I buy the softer springs?

And then, wouldn't I be bleeding off boost to often? Like even under partial throttle? I don't want to do that!

Attaus

There isn't enough pressure to blow off so it's sending the air back to the compressor.

Adjust the BOV to its softest setting or get a softer spring. That still won't guarantee it will pop off at 2 psi. That's a waste of a slug.

631 Teggy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Attaus &raquo;</TD></TR><TR><TD CLASS="quote">There isn't enough pressure to blow off so it's sending the air back to the compressor.

Adjust the BOV to its softest setting or get a softer spring. That still won't guarantee it will pop off at 2 psi. That's a waste of a slug.</TD></TR></TABLE>

Huh? Boost pressure has nothing to do with it. The Tial BOV reacts to Vac. I'm not looking to "pop off slugs" I'm looking to save my turbo from extra stress.

Thanks though.

ImportechPerformance

Is that a complete Peak boost kit?

If not, what piping kit is that?

boosted94cx

that's just the regular tial sound for low boost....all of my friends do it...and mine did it as well.

631 Teggy

This is with the car off mind you.

96 GSR-T

Not supposed to be cracked w/ the car off......

Attaus

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Huh? Boost pressure has nothing to do with it. The Tial BOV reacts to Vac. I'm not looking to "pop off slugs" I'm looking to save my turbo from extra stress.

Thanks though. </TD></TR></TABLE>

Yes, I know what compressor surge does.

A slug = turbo

If you're running your turbo at 2 psi, that's a complete waste of a turbo.

sc4dr

Hes talking about partial throttle operations. It is compressor surge your hearing, but its very minimal. Mine does the same thing.

boosted-EG6

you can cut the spring to where its open slightly under vacuum alot of people do it or if you go to the tial website they tell you what springs is need for the amount of vacuum pulled from the engine i would guess you need a 7 pound spring or 9 pound spring if your car pulls 15-17 on your boost gauge

631 Teggy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96 GSR-T &raquo;</TD></TR><TR><TD CLASS="quote">Not supposed to be cracked w/ the car off......</TD></TR></TABLE>

Well that's not good then. Cuz it's not sitting flush. I may take appart the BOV.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Attaus &raquo;</TD></TR><TR><TD CLASS="quote">Yes, I know what compressor surge does.

A slug = turbo

If you're running your turbo at 2 psi, that's a complete waste of a turbo.</TD></TR></TABLE>

I'm not running my turbo at 2 psi. I meant at partial throttle shifts, I hear compressor surge. Oh, and slug doesn't = turbo. Snail = turbo.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sc4dr &raquo;</TD></TR><TR><TD CLASS="quote">Hes talking about partial throttle operations. It is compressor surge your hearing, but its very minimal. Mine does the same thing.</TD></TR></TABLE>

Thanks.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted-EG6 &raquo;</TD></TR><TR><TD CLASS="quote">you can cut the spring to where its open slightly under vacuum alot of people do it or if you go to the tial website they tell you what springs is need for the amount of vacuum pulled from the engine i would guess you need a 7 pound spring or 9 pound spring if your car pulls 15-17 on your boost gauge</TD></TR></TABLE>

I get -21in/HG at idle, and I have the -11lb spring, which is what Tial suggests. I'm gonna try a bigger vacuum line as well.

1SloCD7

What you are hearing is the wastegate flapping that is the reason you hear a flutter noise. Unless you are not getting vaccum at all. Which would also cause it to do that. My HKS SSBV did that cause I didnt have the bolt holding enough pressure on the diaphram. That was after coming to find out it wasnt opening the BOV cause of my vacuum source. So it cause the wastegate to flap cause it was not coming out the BOV. Check and make sure you feel the air coming out the tial. If not your still not getting a good vacuum source. Just my 2 cents.

P.s. I dont know if thats right but thats what happened to me.

Wideopentuning

The key is taking the vacuum source off a properly sized nipple. It needs to be at least the same size as the TiALS barbed fittings. Also make sure your line isn't collapsing under vacuum....a lot of cheaper "silicone" vacuum lines will do this. I ran a Tial on my turbo Miata and had the same issuse as you. Once I installed a properly sized line it would blow off clean and crisp all the way down at 3.5 psi. This was with the standard 9 psi spring. Another thing I have noticed that can help is that the oring seal on the bottom of the piston is such a good fit that the oring seems to stick in the seat a little bit. A c-hair of engine oil on the seal will prevent this. Also a 7 psi spring will allow the valve to be pulled open during higher vacuum (idle and cruise)

1SloCD7

Sounds like the man knows whats hes talking about.

TIGboy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackEGTypeRB18C5 &raquo;</TD></TR><TR><TD CLASS="quote">What you are hearing is the wastegate flapping that is the reason you hear a flutter noise. Unless you are not getting vaccum at all. Which would also cause it to do that. My HKS SSBV did that cause I didnt have the bolt holding enough pressure on the diaphram. That was after coming to find out it wasnt opening the BOV cause of my vacuum source. So it cause the wastegate to flap cause it was not coming out the BOV. Check and make sure you feel the air coming out the tial. If not your still not getting a good vacuum source. Just my 2 cents.

P.s. I dont know if thats right but thats what happened to me.</TD></TR></TABLE>

wg doesnt flap.