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Old 10-09-2002, 05:30 PM   #1
bettyboost
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Default the cool rally car sound

I heard it was the wastegate and then I heard it was something with the bleeder valve witch one is it guys??

~Betty
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Old 10-09-2002, 05:49 PM   #2
Sauceboy01
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I would also like to know! and how can i get my car to sound like that!?
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Old 10-09-2002, 05:59 PM   #3
Penguinking
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take off your muffler - thats step one

then get rid of all ur cats
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Old 10-09-2002, 06:04 PM   #4
triple.5.soul
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why do you just wanna sound fast?

i dont get it......
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Old 10-09-2002, 06:10 PM   #5
Splat_One
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ok guys... back on the subject here...
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Old 10-09-2002, 06:11 PM   #6
Penguinking
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(just for reference, my cars running the vishnu stage zero kit)

ok: after i took the muffler off (despite the obvious sound increase) i noticed a power increase as well. while you might say its all in my head b/c of the loud sound, its actually cause i noticed on my boost gauge that now spool up starts at around 2600 and reaches full boost at 3300 rpms!!! i was really suprised how easy it is now to build boost on the car.

btw, getting rid of your cats is certainly much more than a sound mod, its also good for your exhaust - to get rid of such a restrictive obstruction in the exhaust pipe will certainly give u noticable hp gains
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Old 10-09-2002, 06:30 PM   #7
Sauceboy01
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people you're off track!

I think he meant the sound that sounds like a turkey gobbling, whilst downshifting.. that sound..

so what is it?
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Old 10-09-2002, 06:37 PM   #8
disco
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Perhaps you are hearing the "anti-lag" systems?

I was at the Rally New Zealand and the cars sound kind of like a few motocross bikes flying through the trees and when they let off the gas it sounds like someone is shooting at them.

waaaaaaaaaaaahhhhhhh-pop pop pop-waahhhhhhhhh-pop pop pop-waaaaaaaaaaaaaaaaaaaaaaaahhhhhhhhhhhhhh-pop pop pop.

Then at idle they all sound like they are about to die. Very "burbly".

Nothing sounds quite like it really. Coolest sounding cars in the world.

-disco
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Old 10-09-2002, 06:40 PM   #9
Corn-Picker
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Do you mean the vacuum cleaner sound? I think that's cause they run through such a small restrictor Or the Blow off valve psssst sound?
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Old 10-09-2002, 07:41 PM   #10
Pakin
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I think its the "chirping" sound he is refering to.

-paK
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Old 10-09-2002, 07:49 PM   #11
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if you're talking about what sounds like birds chirping or a grasshopper on crack, thats the wastegate chattering. it is modulating very quickly to control boost and keep the intake manifold pressurized. the impreza wrc does not have a bov; the antilag system found in the wrc will not work with one. a bov is meant to relieve stress on the turbo's thrust bearings due to backpressure when the throttle butterfly valve closes. with the als, the throttle butterfly valve closes but a bypass valve rapidly pulsates open and shut to allow enough air to pass by to produce enough power to just keep the turbo spinning (a bov would just vent all that air). you could actually get a similar effect by rapidly pushing the gas pedal in an out while braking, slowing down, etc., cause in essence thats what the als is doing. however, your timing would be all jacked up since the als pulls timing to reduce torque produced cause the goal is just to keep the turbo going roundy roundy and not the wheels (which would defeat the purpose of slowing down/braking, hehe). the flame coming out the tailpipe is all the unburnt fuel from the rich condition igniting in the exhaust side of the turbo.

anways, thats my understanding of how als works. hope it helps

nqwan
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Old 10-09-2002, 07:49 PM   #12
Brahmzy
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Actually an F1 car idleing is probably the coolest sound I've heard come from a race car. So much power...so little man.
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Old 10-09-2002, 10:45 PM   #13
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According to Brett at MRT, the Anti-lag system, when activated, kicks the timming 180 degrees out and then starts dropping spark plug firing. This intern, allows unburned fuel to be pushed into the exhaust ports of the manifold. When this happens, the fuel ignites outside of the combustion chamber and sends a pressure "shock" wave down the runners to the turbo. A good ALS can create upwards of .8 bar (10 psi) of boost at idle. And sounds like a big bad dog on a really short chain. But, is very hard on the exhaust & turbo. But man, it sounds so bad. When Autronic releases its PNP ECU, it should have the ALS as part of the programming. FUN FUN FUN
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Old 10-09-2002, 11:25 PM   #14
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The high pitch rapid chirp is causes by not having a blow off valve, like nqwan said. This is not good for the turbo but the wrc cars turbo is built to handle it. They are also replaced them quite frequently and even have a spare one in the car to make a repair on the side of the road IIRC.
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Old 10-10-2002, 10:16 AM   #15
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Quote:
Originally posted by Brahmzy
Actually an F1 car idleing is probably the coolest sound I've heard come from a race car. So much power...so little man.
A modern day F1 car is the LOUDEST thing I have ever heard in my life. I watched them at Indy two weekends ago and when they came down the pit lane to start their sighting laps I literally ran to find some earplugs. It was horribly painful. Those semiauto gearboxes shift so quick that unburnt fuel dumps into the exhaust and explodes with each shift. Awe inspiring.

Back on the WRC thread, I guess the original poster was talking about the chirping wastegate as was alredy explained. Is the sound you hear inside the car (that high pitched whine) the turbo whistling or the gearbox whining?
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Old 10-10-2002, 04:54 PM   #16
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Quote:
Originally posted by SonicWRX
Is the sound you hear inside the car (that high pitched whine) the turbo whistling or the gearbox whining?
That sound might be just radio interference. We'll never know unless there's somebody that has gone for a ride in one, here.

-Jeff
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Old 10-10-2002, 05:14 PM   #17
pace
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Quote:
Originally posted by SonicWRX


A modern day F1 car is the LOUDEST thing I have ever heard in my life. I watched them at Indy two weekends ago and when they came down the pit lane to start their sighting laps I literally ran to find some earplugs.
..
Stand close to an NHRA top-fuel dragster when it launches and you'll know LOUD. Even with ear-plugs, you'll experience pain. It's so loud that you'll feel the ground shake and the air vibrate against your skin. Makes an F1 car sound like a Civic with a fart pipe!

Back on topic...

The whining noise inside the WRC cars sounds like radio interference to me. Lack of electrical noise suppression on the ignition systems..??

-Pace
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Old 10-10-2002, 05:35 PM   #18
n2xlr8n
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Default LOUD is right

Quote:
Originally posted by pace


Stand close to an NHRA top-fuel dragster when it launches and you'll know LOUD. Even with ear-plugs, you'll experience pain. It's so loud that you'll feel the ground shake and the air vibrate against your skin. Makes an F1 car sound like a Civic with a fart pipe!

-Pace

I second that. My ears rang for two days.
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