Loud air sound

eclipsed at 3am · #1 09-26-2006, 04:50 PM

Whenever I'm really getting on it, and i hit the full boost that I set(16psi) the car makes a very loud air whooshing noise. I noticed that the noise didnt happen when the wastegate hose fell off once, and it just boosted infinitely. Is that loud air whoosh the sound of the wastegate opening and releasing air? or is it the bov? I'll be at WOT, and it makes that noise.

Black99GST · #2 09-26-2006, 05:04 PM

cool. are you asking a question? or just telling us you dont like the sound... Its the sound coming from the Wastegate BTW... but without the hose, the wastegate wont open @ 16psi IIFC (correct me if i'm wrong) so thats why you dont here it... its the sound of true power IMO

eclipsed at 3am · #3 09-26-2006, 05:27 PM

yeah, i was asking and the statements after were just what i thought it might be, and it seems i was correct on the wastegate. thanks man. is that harming anything? is it bad on the stock wastegate?

Black99GST · #4 09-26-2006, 05:33 PM

i would keep the lvac lines on... its designed to work that way, i dont know all the details, but in order to control boost levels, you need it connected to the vac line.

AbsoluteGTR · #5 09-26-2006, 05:34 PM

QUESTION:: Is it bad to run our cars without the wastegate hose hooked up? I get the same whooooshing sound...but I dont get ANY power out of the car, and I have the wastegate hose hooked up directly to the j-pipe...is this the right way/path to hook the wastegate up?

THANKS

355smallblock · #6 09-26-2006, 05:35 PM

If You Disconnect The Wastgate Vaccum Line Your Engine Will Over Boost And Iminant Destruction Will Insue

355smallblock · #7 09-26-2006, 05:38 PM

Absolute Your Wastgate May Be Stuck Open Or The Electric Or Mecanical Wategate Control May Be Malfunctioning

355smallblock · #8 09-26-2006, 05:42 PM

If Your Factory Boost Is Set At Below 16psi Than The Wastgate Will Open At Factory Spec And The Engine Will Never Reach 16 If The Wategate Is Controled Electronicly The You Have To Reprogram The Pcm If Mechanicly Controled Than You Have To Change The Wastegate It Self

AbsoluteGTR · #9 09-26-2006, 05:43 PM

I know it is not stuck open but when I turn on the car and apply full throttle while I am under the hood, the wastegate seems to open up and let all the exhaust air out so in turn it does not spool the turbo (even though I still read 9-10 psi of boost)...Like I said I feel that this is my problem because I hear a VERY LOUD whooooshing sound.

Also the arm on the flapper (the one that the wastegate hold on too) is VERY LOOSE. I think I remember reading that the flapper has to be failry hard to move...right?

355smallblock · #10 09-26-2006, 05:45 PM

Your Biggest Problem Is The Factory Injectors Can't Keep Up With 16psi

355smallblock · #11 09-26-2006, 05:45 PM

Your Biggest Problem Is The Factory Injectors Can't Keep Up With 16psi

crunchymilk55 · #12 09-26-2006, 05:46 PM

3am, if you still have an internal wastegate, you shouldn't be able to hear it open. You likely have a boost leak that only shows itself when it sees enough boost.

Boost leak test

eclipsed at 3am · #13 09-26-2006, 05:46 PM

my factory injectors keep up fine with 16psi

crunchymilk55 · #14 09-26-2006, 05:47 PM

Quote:

Originally Posted by 355smallblock

Your Biggest Problem Is The Factory Injectors Can't Keep Up With 16psi

stock boost on a 2g is usually somewhere around 15psi. His injectors are fine, especially as rich as the stock ecu is.

355smallblock · #15 09-26-2006, 05:49 PM

The Arm On The Wastgate In Connected To A Vaccum Controled Acuator If It Moves Very Freely Then The Diaphram May Be Ruptured And The Boost From The Turbo May Be Pushing It Open Prematurly.the Woosh Your Hearing Is The Boost The Torbo Is Applying To The Manifold.

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