Compressor surge!!!!

[slayer_699]

So I have a greddy type s bov. I adjusted it many different positions but I ALWAYS have compressor surge. A week ago everything was fine. I went everywhere from the Loosest position and it still surged. If I boost up past 5 psi then It does compressor surge folowed by a slight pssss... Shouldn't it go psss only like it used to? Is it just a worn bov? Bov age is unknown. Was on when I bought the car.
Thanks everyone!

 

[007jimmy]

Is there anything T-ed into the BOV line?

 

[ramsack]

Fluttering isn't surge. If you think that's surge, then by logic any boost is surge. True surge is compressor stall. What you're experiencing is a BOV that is insensitive. The BOV blows off, the pressure drops, the turbo still spins, it creates more pressure, the BOV opens again.

 

[Clever Gs-t]

I agree that the Bov is just very sensitive. Another senerio is that the Bov is to small for your setup. What size turbo are you running?

 

[ramsack]

The BOV is too insensitive. There is a minimum amount of pressure it takes to open. Any BOV will sufficiently vent enough pressure for any sized turbo anyone would run on these cars. Pressure drop out of a 1" or larger hole is pressure much instantaneous. As long as pressure in the charge pipes doesn't rise above what the boost level was, the BOV is doing its job saving the turbo.

 

[slayer_699]

Is there anything T-ed into the BOV line?

The only thing t-d off is my boost gauge.

Fluttering isn't surge. If you think that's surge, then by logic any boost is surge. True surge is compressor stall. What you're experiencing is a BOV that is insensitive. The BOV blows off, the pressure drops, the turbo still spins, it creates more pressure, the BOV opens again.

Fluttering? Does that make my whole air intake jump up and down? ### that is what mine does...

 

[ramsack]

Well air moves, and has mass, so why wouldn't something with mass move other objects when it vibrates?

 

[slayer_699]

I agree that the Bov is just very sensitive. Another senerio is that the Bov is to small for your setup. What size turbo are you running?

Im running the stock turbo.

 

[crash89]

Try T-ing your boost gauge between the fuel pressure solenoid and FPR and running a single line from your intake to the BOV.. Thats how I have mine and mile will "pssss" with even a couple lbs of boost.. Sometimes I get a little flutter before the "pss" but not always.

 

[slayer_699]

Well air moves, and has mass, so why wouldn't something with mass move other objects when it vibrates?

It just seems like it would blow off instead of flutter. It just happened all of a sudden one day. That is what i don't get. I didn't even make any adjustments before that.

Try T-ing your boost gauge between the fuel pressure solenoid and FPR and running a single line from your intake to the BOV.. Thats how I have mine and mile will "pssss" with even a couple lbs of boost.. Sometimes I get a little flutter before the "pss" but not always.

I will try that and see if it works. But what difference would that make?

 

[ramsack]

A membrane inside could have popped. I don't know why the Type S ships with a tee for the two chambers. A certain type of check valve is required for the lower chamber.

 

[slayer_699]

A membrane inside could have popped. I don't know why the Type S ships with a tee for the two chambers. A certain type of check valve is required for the lower chamber.

How would that be fixed? Im not very familiar with bov's.

 

[ramsack]

You don't. They discontinued them a long time ago. You're not even positive what the problem is, or that there is a problem.

EDIT: NGR makes knockoffs and has their own diaphragms: http://www.ngrperformance.com/buyngr.php?view=productPage&product=7&category=

 

[slayer_699]

I feel really dumb. I found a small crack in my vacuum line. I fixed it and everything is totally fine now. That's everyone for your input i still learned alot!!

 

[red_devil]

Thats good.

Just wanted to add that doing the single spring mod also helps reduce compressor surge.

 

[Jon91TSi]

I feel really dumb. I found a small crack in my vacuum line. I fixed it and everything is totally fine now. That's everyone for your input i still learned alot!!

Glad you found the problem! If you ever need a hand I'm only 10 minutes up the road!

 

[slayer_699]

Glad you found the problem! If you ever need a hand I'm only 10 minutes up the road!

Where are you from?! I've been looking for dsm's around me!!!

 

[Jon91TSi]

Where are you from?! I've been looking for dsm's around me!!!

I'm just outside of Bernville

 

[Tiki2777]

I am happy for you that you found the problem.

 

[slayer_699]

I'm just outside of Bernville

Sweet. Well have to get together some time.

 

[Jon91TSi]

Sweet. Well have to get together some time.

Sounds good.

 

[ramsack]

That is compressor surge. BOV flutter is an excuse made up by people who have BOVs that aren't setup right. Air is not supposed to go backwards through a turbo for a reason.

I am happy for you that you found the problem.

Obviously you don't understand physics.

 

[slayer_699]

Sounds good.

Do you ever get up here around Womelsdorf much?

 

[Jon91TSi]

Do you ever get up here around Womelsdorf much?

I pass through every day on my way to work.

 

[V8Killer25]

What if I flutters under low boost but not high boost?