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Old 07-17-2013, 11:25 AM   #1
Garrettlicious
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Default The chirp chirp from impreza rally cars

I was wondering if I could make my car do the chirp chirp that the old impreza rally cars would make cause I think it sounds pretty cool, that is if it doesn't damage anything
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Old 07-17-2013, 11:47 AM   #2
Notch 8
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This place:
http://vtcar.com/

Tell them you want the "chirp chirp".
Tell them you have an open checkbook.

Please report back.

Thank.
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Old 07-17-2013, 12:04 PM   #3
Indocti Discant
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Old 07-17-2013, 12:06 PM   #4
T-37
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It's compressor surge - caused by running no bypass/blowoff valve at all.

This may cause damage to the turbo's compressor wheel. Prodrive typically didn't care (because racecar,) you might care a little bit - as turbos aren't typically a disposable commodity.
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Old 07-17-2013, 02:09 PM   #5
chimchimm5
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Novelty product idea!
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Old 07-17-2013, 04:02 PM   #6
RB5 Clone
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That chirp-chirp is the sound of massive wads of $$$ blasting out the tailpipe in a haze of sweet-smelling race gas vapor.

Easy to make your own car sound exactly like that....Just Apply Money.
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Old 07-17-2013, 04:51 PM   #7
Fred
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Quote:
Originally Posted by Notch 8 View Post
This place:
http://vtcar.com/

Tell them you want the "chirp chirp".
Tell them you have an open checkbook.

Please report back.

Thank.
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Old 07-18-2013, 02:14 AM   #8
blubug_768
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I've never herd a definitive answer about where it exactly comes from, but have herd people say compressor surge. The commentators on FIA rallycrossRX say its the waste gate, whatever it is its definitely from a lack of bov. Running 4.5 bar through a $16,000 turbo with a little fresh air als on the side cant hurt either!
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Old 07-18-2013, 08:59 AM   #9
Garrettlicious
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Cool, thanks guys and thanks for the link! I think I'll go without the chirp chirp for now then lol
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Old 07-18-2013, 10:15 AM   #10
boost junkie
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Old 07-18-2013, 10:46 AM   #11
elijahbaley
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Gigi Galli testing the Evo WRC a few years ago. The chirp chirp starts 1:05min.


Freaking gorgeous symphony.

It's due to compressor surge. I managed to achieve with a VF52 and PW TMIC using a Forge BPV and hardest red spring. But not as loud as that.
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Old 07-18-2013, 12:38 PM   #12
bnasty49
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Lol it sounds like a dolphin. Or a chipmunk!
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Old 07-18-2013, 01:44 PM   #13
PitwrkzZ1
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This may be a dumb question, but why not use a BOV? Less lag?
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Old 07-18-2013, 01:53 PM   #14
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Its supposed to keep the ic tubing pressurized for better throttle response or something like that.
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Old 07-18-2013, 03:03 PM   #15
Vinnie
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man, I forgot how gorgeous those WRC cars were. I loved that era of rally racing
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Old 07-19-2013, 07:04 AM   #16
Bimmubishi
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There's no BOV because the throttle never shuts and the intake manifold never goes into a vacuum state. ALS keeps the throttle open-

The purpose of a BOV is to keep the turbine from stalling which happens when the throttle shuts.

It surges because the turbo is making more boost than the engine can take in at low throttle angles. This is due to the anti-lag.
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