17 replies to this topic

[MiniWalks]

Guys n Gals,

Recently put a boost gauge in my B4.
And when trying to see how high it will go, i put it in 4th and plant the foot, when the boost reaches 1Bar (right on the gauge) i hear a whistling kinda noise that sounds like air rushing out from somewhere

Only thing that i can think of that it sounds like is the BOV, but its not a quick noise, if you keep the throttle open, itll keep going, till you backoff and then the BOV "sneezes" as per normal

Any thoughts?

I can get it to happen fairly regularly, but only in 4th, no other gears seem to hit 1Bar

[buzzda]

All the clamps done up tight? checked for leaking hose?

I had a similar thing happen once, turned out I hadn't done one of the IC-man clamps tight enough.

[Delete This Account]

Only thing that i can think of that it sounds like is the BOV, but its not a quick noise, if you keep the throttle open, itll keep going, till you backoff and then the BOV "sneezes" as per normal

Any thoughts?

Do you have a Pod filter?

It just might be the induction noise and the "BOV sneeze" might be turbo flutter when you're in vacuum before it hits boost.


This happens a lot if you are in a higher gear and at low revs and you step on it and then take your foot off the pedal.

[hawks_123]

My car makes that sound as well, for me it's the turbo spinning at 190,000rpm
You may only hear it in 4th because engine noise is usually lower.

[Richo]

check for air leaks.. I had a hose come off (~1 inch ID) and still made 12psi at the inlet.. Hate to know how fast that turbo was spinning

[ams]

i hear a whistling kinda noise that sounds like air rushing out from somewhere

Is the drivers side window done up?

But seriously, it could be the BOV - is it an adjustable one? (to vent external or recirc) From memory on mine (GFB) I can adjust the spring rate as well...

Checked?

[MiniWalks]

Thanks for the suggestions guys,

Its seems to only happen in 4th and 5th, but i think it happened yesterday when i really punched it in 3rd...

Happens as it hits 1Bar, comes on suddenly....
- It is more hear-able with the windows up
- Its an adjustable BOV (GFB GT Hybrid - Currently full Vent)

I cant see any obvious hoses off anywhere.. I just cant remember for sure or not, whether it was happening before i got the exhaust done .... (Now Twin 2.5" into 3")

Weird tho, in 4th, when it happens, the speedo will go up, the boost and RPM wont move until you back off

Any further ideas, things to look for?

[Richo]

the guage ? or its plumbing ?

"It is more hear-able with the windows up" <-- so its in the cabin... what is also now in there.... ... ....... ...

"the speedo will go up, the boost and RPM wont move until you back off" ummm... what

[Delete This Account]

I bet you it's just turbo flutter, car is trying to boost, but it's getting no-where because you are in a higher gear. Then you back off the the boost has no-where to go.

[MiniWalks]

I mean, when the air noise is occuring

The car is accelerating, but the boost gauge will stay on 1Bar, and the Tacho will stay at 3K RPM (example in 4th gear)

How would a Defi gauge make that much noise? When its fully electronic?

[buzzda]

It's impossible for your speed to be increasing without revs increasing while in gear.

[Delete This Account]

Also, it's impossible for your speed to be increasing without revs increasing.

Downhill?

[buzzda]

Downhill?

Not in gear, unless yr clutch is completely rooted.

[acres]

Try adjusting the BOV spring rate. The OEM bypass valve on mine used to leak under boost and it gave off quite an audible induction/air rushing type of noise. Replaced it with a Turbosmart Dual Port and kept the spring rate nice and tight and now its no problem.

[MiniWalks]

was not downhill, clutch still bites likes a twilight wannabe

might not have been moving much then :S

i dunno, its just weird, and i wanna know whats wrong before something goes boom


*edit*

Acres, ill try that when i get a chance this w/e

[Delete This Account]

was not downhill, clutch still bites likes a twilight wannabe

I like what you did there!

i dunno, its just weird, and i wanna know whats wrong before something goes boom

Face it, it's a B4, it will happen sooner than later!

[buzzda]

where bouts are you? maybe organise a ride in another B4 with similar mods and see if it's common. There's really too many things it COULD be... esp without being able to hear the actual noise ourselves.

[MiniWalks]

Scoresby - East Victoria (Near Knox)

hahah

Thanks Walts (Clearly its worth a Rep Point )

I know one day it will go boom, but i want that day to be by my hand