skittle?

[KnifeEdge_2K1]

Although I am relatively new to the board, I know that it is foolish to question Matra et Alpine’s wisdom. Nevertheless, I have my doubts as to whether or not what the original poster described as a “skittle” is in fact the AL system.

The following link is a video of a Subaru WRC car entering and exiting the equivalent of a hair pin (900Kb avi file).

http://jupiter.walagata.com/w/alasto...mpreza.WRX.zip

Well before and most of the way through the corner a high pitched squeak (I am assuming this is the “skittle” noise) can be distinctly heard. Upon existing the corner the squeak is no longer present. Once on the straight a pop or bang can be heard during the up-shift, and then several more again at the end of the video (presumably from lifting off the accelerator).

It seems to me that the initial squeaking sounds more like a BOV or similar device. While the popping/banging could be caused by a AL system.

Even though there are not any question marks above, it is a question ;-)

i know this is an old post but i just saw it, the only sounds i could make out was tire squeal, bov during the up changes, and the engine itself

[Alastor]

i know this is an old post but i just saw it, the only sounds i could make out was tire squeal, bov during the up changes, and the engine itself

When I watch this video I hear lots of tire squealing also. But during the beginning of the video (0 -> 4 seconds) I hear a 'chirping' sound (I assume this 'chirp' is what the original poster described as a 'skittle'). To me this sounds like a BOV although it differs slightly from the traditional sound. Instead of making the normal "whoosh" it 'chirps' in short intervals. The only time I have heard a BOV make a 'chirping' sound is on a automatic AWD DSM. It is hard to say if the car is decelerating or accelerating during the corner entry so I wont make any assumption about it.

However, after clearing the corner the Subaru is accelerating away from the camera and at least one up-shift takes place. During the up-shift a short pop or rumble can be heard. As well during the initiation of the feint maneuver (~8 seconds) more rumbling occurs I assumed from releasing the accelerator. I was wondering if the rumbling could be caused by a anti-lag system.

[paul]

yes my post was wanting to know what that exact chirping/clipping/skittle sound was just as the car is decelerating and maunovering round the corner it made a short sharp/skittle/chirping sounds in very short intervals and stopped soon as the car accelerates again!

[johnnynumfiv]

couldn't it be ABS? if they brake hard, you should hear when the brakes go on and off with the skittle noise.

[paul]

i don't think rally cars use abs ,lol

[johnnynumfiv]

oooo, didn't know you were talking about rally cars, i haven't really followed the thread.

[paul]

ha ha na its rally allright , just tring to define what this skittle/chirping sound is comming from , matra originally has said its an anit turbo lag technique so its got to be that!

[KnifeEdge_2K1]

yeah, as the car is going into the corner the skittle is most likely the anti lag system keeping the turbo turbine speed up, it sounds like rapid firing roman candles

[paul]

or a cage full of budjies!!!!

[Alastor]

I took this sound clip from this On Board Camera Tramac Edition 2000 vid.

It is 37 seconds from a Peugeut 206:

http://jupiter.walagata.com/w/alastor/ALS.mp3

During braking there is a popping/banging noise sounds kind of like rocks bouncing around inside the cockpit. Just wondering if that is the AL system at work?

[paul]

yes im guessing thats just the sound of the car repeatidly back firing because of the als