I'm not 100% sure, but I'm thinking that it's the ABS kicking in.
Aibhne
Marc
Marc
> Marc
> > Even tho it's at least a week delayed now, we still get pretty
thorough
> > race recaps of the World Rallye Championship. In many of the exterior
> > shots of the cars you can hear them chip/squeak as they navigate the
> > corners. What is the cause of this noise? Springs? Brakes?
> > dave henrie
I always just assumed that the little chirps and squeaks were from the
suspension or even the brakes. If someone makes a modern day WRC game
(pleeeaaaaaaaaseee), I'd love to be able to hear these same noises during
replays.
Mike
http://mikebeauchamp.com
Jeff H.
It's the turbo. More accurately, it's the wastegate bleeding off excess
boost. I used to own a slightly modified '86 Buick T-Type that ran the
1/4 mile in the mid-12 second range and in it, you could hear the
wastegate operating when you let off the gas. The Buick had a fairly
large (by today's standards) aftermarket turbo and wastegate so the
sound was more pronounced than it is in a factory stock turbo car.
--
__________________________
Todd Walker
http://twalker.d2g.com
__________________________
But isn't the turbo waste=gate a popping noise? pop pop this is more
like a bird chirp or a metal on metal squeak. Do the turbos really sound
like that?
dave henrie
Its the wastegate on the Turbo its as they come off the throttle and IIRC -
a valve released pressure from the turbo system to stop it trying to 'push'
the fuel/air mix into the cylinders after the driver has come off the
throttle
Doug
>> It's most likely the turbo blow off valve... it releases the pressure
>> from the intake manifold when the driver lifts his foot off the
>> accelerator. AFAIK the only game that has this modelled is netKar
>> (Supra TT).
>> --
>> - JKo -
> But isn't the turbo waste=gate a popping noise? pop pop this is more
>like a bird chirp or a metal on metal squeak. Do the turbos really sound
>like that?
>dave henrie
It could also be the system that is used to spool up the turbo (or
rather to keep it spinning) while lifting off the throttle... I don't
know if this system is currently used in WRC cars though; small amount
gasoline is ignited in the exhaust manifold, which causes pressure in
the manifold and spins the turbo. This also causes the flames you see
coming out of the tail pipe sometimes. This is done to reduce the
turbo lag.
--
- JKo -
> >> It's most likely the turbo blow off valve... it releases the pressure
> >> from the intake manifold when the driver lifts his foot off the
> >> accelerator. AFAIK the only game that has this modelled is netKar
> >> (Supra TT).
> >> --
> >> - JKo -
> > But isn't the turbo waste=gate a popping noise? pop pop this is more
> >like a bird chirp or a metal on metal squeak. Do the turbos really sound
> >like that?
> >dave henrie
> The popping noise is probably coming from the ignition system. It cuts
> off the ignition while shifting to allow shifting without using the
> clutch (semi-automatic transmission, clutch used only for standing
> starts).
> It could also be the system that is used to spool up the turbo (or
> rather to keep it spinning) while lifting off the throttle... I don't
> know if this system is currently used in WRC cars though; small amount
> gasoline is ignited in the exhaust manifold, which causes pressure in
> the manifold and spins the turbo. This also causes the flames you see
> coming out of the tail pipe sometimes. This is done to reduce the
> turbo lag.
A modern WRC car sounds pretty much like an episode of the Three Stooges.
You've got the anti-lag system sounding like Moe going at it with the slap
of his hand (Bang... Bang... grrrr...) followed shortly thereafter by the
distinctive sound of the wastegate, sounding like Curly at his best (Wooo
woo woo woo)...
Even the street-legal Cossie I once drove sounded a treat working its way up
and down a Swiss mountain pass.
Stephen
It's the rear end. They use a "limited slip" differential.
