Also, many ABS systems have lateral accelerometers which more aggressively
reduce rear brake effort when cornering. This helps keep the car from
swapping ends if you stomp the brakes in a corner but also makes the car
difficult to point in using trailing braking.
-- Rick Brown
BP Corvette
> -----Original Message-----
> From: owner-ba-autox@autox.team.net
> [mailto:owner-ba-autox@autox.team.net]On Behalf Of Josh Sirota
> Sent: Saturday, May 17, 2003 9:10 PM
> To: ba-autox@autox.team.net
> Subject: ABS and "straightening"
>
>
> James wrote:
> > i really
> > only noticed it in a miata once, where the ABS would
> > cause the car to
> > straighten under braking. (horrible feeling :-))
>
> There's a reason for this.
>
> Basically, the ABS works by allowing the tire to lock, and then
> backing off.
> Although the tire is only locked for an instant (these things pulse very
> quickly, like 20Hz or faster), during that instant the locked
> wheel will go
> straight, just like any locked wheel.
>
> So if cornering while using ABS, you will always require more
> steering input
> than the same corner without ABS (and without any tire locking.)
>
> When I did the Skip Barber Advanced Driving School in a previous lifetime
> (before I started autocrossing), we did this very exercise in BMW
> M3s, and it
> was very clear what was going on.
>
> Josh
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