WRC Cars?
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Impreza WRC cars don't have a dump valve. There's some debate about exactly what causes the chirping on the WR Cars, but either way it's going to be difficult to reproduce (and keep your car reliable), as it's partly a result of the high boost pressures and anti-lag the WR Cars run.
It is possible to produce a similar sound by greatly increasing the spring strength, or completely removing the dump valve on a standard car, thus forcing air to pulse back past the compressor instead of being dumped.
You'll get better throttle response in this circumstance, but the working life of your turbo will be reduced as a result (WRC turbochargers go a maximum of 500 stage kilometres before being rebuilt!).
There are supposedly also some dumpvalves designed to mimic the noise, but I don't profess to know much about these!
[Edited by greasemonkey - 10/6/2003 10:20:38 PM]
It is possible to produce a similar sound by greatly increasing the spring strength, or completely removing the dump valve on a standard car, thus forcing air to pulse back past the compressor instead of being dumped.
You'll get better throttle response in this circumstance, but the working life of your turbo will be reduced as a result (WRC turbochargers go a maximum of 500 stage kilometres before being rebuilt!).
There are supposedly also some dumpvalves designed to mimic the noise, but I don't profess to know much about these!
[Edited by greasemonkey - 10/6/2003 10:20:38 PM]
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what sort of dump valve / induction / wastegate do the WRC Imprezas use to get the chirping on lift-off?
I'm sick of whooshy noises
I'm sick of whooshy noises
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Oh, don't get me wrong, you can achieve a similar noise for just the price of a blanking plate/bung where your dump valve should be. The problem then is that it's going to cost you money in terms of turbo wear (and possible engine damage if you don't catch a failing one early enough!).
Dumpvalves, I'm not really the person to ask regarding current aftermarket products, although I thought the Blitz was supposed to have a "chirpy" mode.
Incidentally, I've often thought that an electronically commanded, solenoid controlled dump valve would provide the best compromise between turbo safety and throttle response, and a design of this sort would coincidentally produce a "chirp-like" sound. If only I could find someone to manufacture it...
Dumpvalves, I'm not really the person to ask regarding current aftermarket products, although I thought the Blitz was supposed to have a "chirpy" mode.
Incidentally, I've often thought that an electronically commanded, solenoid controlled dump valve would provide the best compromise between turbo safety and throttle response, and a design of this sort would coincidentally produce a "chirp-like" sound. If only I could find someone to manufacture it...
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A-ha, so the conclusion is obvious. If you want that "chirpy" lift-off sound without damaging your Impreza's turbo, buy a Smart and make your missus drive round everywhere behind you.
Even better, remove the engine, put it in the boot of your Scoob (it'll probably fit in the spare wheel well), and link the throttle cable to the accelerator!
Even better, remove the engine, put it in the boot of your Scoob (it'll probably fit in the spare wheel well), and link the throttle cable to the accelerator!
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