off topic / traction control

[Bruce Plecan]

Last submitted posting (from this location)  was by Doc, oops

Everything about anything to do with anything is about testing.
Mileage, ET, trap speed, areo loading, engine combs, it all changes.
And the secret to that is notes.
Anyway
Amen
Bruce
   Did I say the GN did a calc'd 301 Ft/lbs of torque at 3,900 rpm ealier
today (at 15 PSI).



> 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.


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