some are saying that its just the intake sucking in air and others are saying maybe a vac leak. Im about to make a boost leak tester and let u know what happens.
wow well after see this thread a few days ago and thinking nothing of it i got that strange whistle happen to me tonight. I already checked everything and its all fine im just wondering if it had something to do with the colder weather tonight. If i figure anything out i let u guys know, im S3 btw.
Minw whistles too, always has even when I was stock turbo, it's the intake, JMB with K&N, just think how much air is being sucked into the motor during a WOT run! Aldo i am thinking with all the vacuum ports sticking out here and there with that level of air blowing by over the openings that it makes the noise, like blowing over the top of a soda bottle.......
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Mods: AGP GT3076R DBB Turbo
"The Cobalt firmly grabs you and whisks you along your way instantly. It does so with authority and poise, but while slipping relatively unnoticed through traffic, never being violent, or dare I say it, frightening. When you ask the SRT-4 to take you somewhere fast, it punches you in the face, throws you over its shoulder, and runs, screaming, so quickly that its tires can barely keep up."
I was thinkin its the intake too. Im gonna do the same thing as u and remove it for a pull and see what happens. Did a boost leak testand everything was ok.
OK, it sounds like the wastegate. Not the WGA, but the actual internal flapper. The part where the shaft comes thru the mani makes a whistle sound when the gate opens to limit boost. External wastegates sound the same, but vent with a tube, instead of back into the mani. Mines done it since day one. Heard it on a few SRTs...
May be wrong, but thats what I am thinking. Any shaft like that is gonna have a bit of leakage, and thats about the right sound. Especially gonna leak after a few thousand miles as that area will wear a bit and leak more. Like the bleed air valves on F-15s.
Thats cool tho, makes the skittle sound like an externally gated turbo!
OK, it sounds like the wastegate. Not the WGA, but the actual internal flapper. The part where the shaft comes thru the mani makes a whistle sound when the gate opens to limit boost. External wastegates sound the same, but vent with a tube, instead of back into the mani. Mines done it since day one. Heard it on a few SRTs...
May be wrong, but thats what I am thinking. Any shaft like that is gonna have a bit of leakage, and thats about the right sound. Especially gonna leak after a few thousand miles as that area will wear a bit and leak more. Like the bleed air valves on F-15s.
Thats cool tho, makes the skittle sound like an externally gated turbo!
I dont have a stock turbo i have a 50 trim and my wastegate doesnt sound anything like a whistle its like a second exhuast.
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