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by **YTWGN** » Sun Sep 12, 2004 6:49 pm

When easing off the throttle on the GTT it lets out a strange low groan, its totally different from the exhale noise. The car has a sard pod filter and 2.5" exhaust.

Does anyone know what makes this noise?

Apparantly if you put the standard cold air box back on it gets rid of the noise, according to a mate.

TWSTD: I notice you have a similar setup, have you experienced this?

Cheers,

by **TWSTD** » Mon Sep 13, 2004 11:58 am

Yeah - i have (had) the same SARD setup. I didnt get any groan aye. Im happy to have a look / listen to your setup if you like and see if i can work out what it is... if your in AKL that is...

AL

Caldina GTT · by **Inane** » Mon Sep 13, 2004 12:05 pm

what sort of B.O.V do you have?

by **TWSTD** » Mon Sep 13, 2004 12:08 pm

it looks like its probably the factory one

Caldina GTT · by **Inane** » Mon Sep 13, 2004 12:38 pm

true, only took a quick glance...

I would suggest that the groan could be (twstd correct me if I'm wrong here buy your Idle air intake is on a seperate filter?)

but it looks like your idle air intake is plugged in just behind the air filter,

when you drop foot off accelerator and vacumn appears and increases, the idle air intake sucks gradually harder and harder, causing a bit of a groaning noise...

I could however be totally off the mark here...

by **YTWGN** » Mon Sep 13, 2004 12:43 pm

That sounds exactly like what it is. Im yet to put the boost gauge in the car but it is just as the car is heading into vacuum that the noise happens.

I am in Auckland (north shore) so if you wouldn't mind confirming that theory

.

BTW. what boost can the factory B.O.V handle before it leaks? Can it handle 1.0 bar alright?

Cheers for the help.

Caldina GTT · by **Inane** » Mon Sep 13, 2004 12:53 pm

not certain on the physics, but its to do with the directional change in the air & its velocity that causes the noise,

I have it occur on mine as well,

however being in wellington I cant help, but I'm sure twstd can...

by **YTWGN** » Mon Sep 13, 2004 1:00 pm

So its nothing to really worry about?

Any ideas on how to get rid of it?

Cheers,

Caldina GTT · by **Inane** » Mon Sep 13, 2004 1:03 pm

best way of testing the theory would be to get a small filter and attach it to the end of your idle air intake, (make sure you block the pipe from the side of you air intake so you dont suck dirty air into your turbo)

then run the car like that and see if it still makes the noise...

by **TWSTD** » Mon Sep 13, 2004 1:07 pm

yeah im on the shore too man - happy to have a look. I used to have my Idle Air intake plumbed in exactly as in the pic above - and i didnt get a groan then from memory?

Im pretty busy this week - got lots on then then headin to the mtn wed after wk - but will be back saterday if u wanna come round then? hm phn 4800018 - feel free to gimme a call :-)

AL

by **TWSTD** » Mon Sep 13, 2004 1:08 pm

and yeah - like Inane said - thats one of the things i was gonna test with ya - i have a filter we can use too.

by **YTWGN** » Mon Sep 13, 2004 1:13 pm

Oh ok sweet.

Yeah I'd be keen to give it a test with the filter.

Might give you a call sometime.

Thanks,

Chris.

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