off topic / traction control

[Bruce Plecan]

----- Original Message -----
From: "Walter Sherwin" <wsherwin at home.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, January 12, 2001 10:19 PM
Subject: Re: off topic / traction control


> Right on!........
>
> Not to pick on anybody in particular, but, a good example was when
Chevy/GMC
> truck decided to first install   B.F. Goodrich 275/60/R15 HR4 tires on a
> 15"x7" rim assembly, in 1990,  as part of their C1500 ZQ8 truck
performance
> suspension package.  The intention was good, but, what were they smoking
at
> the time?  At highway speeds, from behind, you could see daylight between
> the shoulders and the pavement.  I've got a set of these where the
center's
> are worn to the limit while the shoulders still have the "nubbins" pretty
> much intact.  Dozens of other ZQ8 contacts have had the same experiences.
> How much handling do you think a person has with 2-3" contact patch width
at
> the rear at speed?  Even B.F.G. themselves do not advocate this combo in
the
> aftermarket world.
>
> Real world performance all comes down to what exact tire you have, on what
> exact rim, under specific conditions,  and under specific inflation
> pressures.  Test, Test, Test, and then reTest, just to make sure.
>
>
> Walt.
>
>
>
>
> > depends on the car, the tire, and the rim size. In most of the cars I've
> driven 40 psi wont let the outside edges of the tire contact the road. For
> example at 36 psi 215/70/15 tires on a 92 tracker 2 door only the center
> inch was touching the road ( measured using the puddle method) and the car
> was scary. On a 87 Subaru 4dr 4x4 sedan 36 psi gave about the same contact
> patch.
> >
> >  The best tire pressure is a trade off between wear, and traction, and
> ride. The tire maker sets a pressure that makes the tire last longer on
the
> test stand, to automakers give the pressure for best economy with handling
> factored in as small
> > part.
> >
> >  The only solid rule I've found is that you have to test.
> >
> > Previously, you (John Edward Miller) wrote:
> > { > Normally, you lower tire pressure for traction
> > {
> > { </LURK
> > {
> > { Not cornering traction, not on street tires.  Best grip ~40-46psi in
> most
> > { cases.
> > {
> > { John.
> > {
> > { <LURK>
> >
>
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