wastegate ?
05 April 2011, 10:28 PM
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05 April 2011, 10:38 PM
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Thanks mate , interesting and also explained the other thing i was wondering about ? screamer pipes and the so called " waste gate chatter " u learn sumthin new every day 
06 April 2011, 07:22 AM
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Looking at the wiki article about "wastegate chatter" it says this:
"Actual wastegate flutter occurs instead under partial boost conditions such as partial throttle near the boost threshold. It sounds like FftFftFft not ShuShuShu and is caused by the rapid opening and closing of the wastegate at boost levels near the spring pressure."
Is this correct? Doesn't sound right to me at all. A wastegate is not an on, off device like a solenoid. As you reach the set pressure the force overcomes the spring in the actuator and starts to open the wastgate diverting some of the exhaust gasses around the turbo, as the pressure overcomes the spring it compresses it. The more pressure the more it compresses and the more the wastegate opens. When you reach a certain point the wastegate is fully open and if it can not flow any more you will get boost creep. At least that's my understanding of it. So is that part of the article a load of crap?
"Actual wastegate flutter occurs instead under partial boost conditions such as partial throttle near the boost threshold. It sounds like FftFftFft not ShuShuShu and is caused by the rapid opening and closing of the wastegate at boost levels near the spring pressure."
Is this correct? Doesn't sound right to me at all. A wastegate is not an on, off device like a solenoid. As you reach the set pressure the force overcomes the spring in the actuator and starts to open the wastgate diverting some of the exhaust gasses around the turbo, as the pressure overcomes the spring it compresses it. The more pressure the more it compresses and the more the wastegate opens. When you reach a certain point the wastegate is fully open and if it can not flow any more you will get boost creep. At least that's my understanding of it. So is that part of the article a load of crap?
Last edited by Saint AAI; 07 April 2011 at 07:37 AM.
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06 April 2011, 03:50 PM
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Anyone care to donate a chattering car for an hour or so? I might be able to find one to play with. Definately got to mythbust that hearsay for sure!!
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06 April 2011, 04:47 PM
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07 April 2011, 07:36 AM
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I know that wastegate chatter is a load of crap and the noise is from compressor surge, I was just wondering if the statement made on wikipedia was correct, as it sounds like bull sh*t to me? They explain about compressor surge, but then go on to say that "real" wastegate chatter is something else. I don't think it exists at all.
07 April 2011, 08:15 AM
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I know that wastegate chatter is a load of crap and the noise is from compressor surge, I was just wondering if the statement made on wikipedia was correct, as it sounds like bull sh*t to me? They explain about compressor surge, but then go on to say that "real" wastegate chatter is something else. I don't think it exists at all.
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