>when the inside wheel instead locks and goes into sliding friction, where
>it assists in turning not at all and braking only very little.
this called Flat-Spotting and is Verboten my car :)
there is the area around true threshold braking where the tire is sliding
some but turning some- it is here it makes the most traction, so there
should be more traction at threshold, thus helping to equalizing the total
braking and increase traction on the inside front. (in theory!- HA!)
however i repeat that brakes and braking arent that important. i had a
twisted brake line to the rear of my car- so i drove all of last season with
virtually no rear brakes. bah humbug, i fixed it and the braking is better,
but i still dont think it matters much. im going to win or lose based on
what i do with the gas, not with the brake.
people think- gas and brake, 50%/50% importance. WRONG! gas and brake,
90%/10% importance. (just make sure you slow down too soon, not too late)
-james
OSP - Opinionated Snake Pontificates
----- Original Message -----
From: "Kevin Stevens" <Kevin_Stevens@pursued-with.net>
To: "James Creasy" <james@thevenom.net>
Cc: <ba-autox@autox.team.net>
Sent: Tuesday, December 10, 2002 4:52 PM
Subject: Re: The hardest autox skill?
>
>
> On Tue, 10 Dec 2002, James Creasy wrote:
>
> > > ABS allows you to brake to the ability of the tire with
> > > the BEST traction instead of braking to the ability of the tire with
the
> > > WORST traction.
> >
> > unfortunately this exact behavior tends to create understeer because it
> > releases the brakes differentially: that is, it reduces the brakes only
on
> > the inside front losing traction, not all four brakes like a driver does
at
> > threshold. the outside tire has more traction, and creates a moment arm
> > from the center of gravity around that side (the outside) with greater
> > traction, i.e. understeer. i noticed this in stuart langager's miata,
the
> > only r tire ABS equipped car ive driven recently.
>
> My experience is that it creates much less understeer than without ABS,
> when the inside wheel instead locks and goes into sliding friction, where
> it assists in turning not at all and braking only very little.
>
> A driver doesn't lock "all four brakes" when there is lateral acceleration
> happening (which is the scenario I described), unless s/he's hopelessly
> hamfooted. You lock the inside wheel(s), which ones depending on the bias
> adjustment. The outers may then slide and/or lock because the insides
> are no longer doing much work, but at that point you're already screwed.
>
> In distinction, if you're braking to threshold on the outside front of a
> decent ABS car, the other channels are allowing those wheels to continue
> contributing to the cause, from each according to their means. You have
> smoother, harder, more effective braking.
>
> KeS
|