off topic / traction control

[Romans, Mark]

I have found that it doesn't always follow logic.  Spend some time
in a car with an EVA, Electronic Vibration Analysis tool and you'll see.
Lowering tire pressure in some cases makes a car not feel as smooth.
The eva will still show the same normal road vibration magnitude, however
raising the tire pressure raises the frequency so your buns don't feel it as
much.  (My experience on one type of vehicle).
Also if you read the Ford doc or any document that explains turning, not
drag strip racing, lower the tire pressure decreases the grip at the end
of the vehicle that the tire pressure is being lowered on.
----- Original Message -----
From: "Programmer" <nwester at eidnet.org>
To: <diy_efi at diy-efi.org>
Sent: Thursday, January 11, 2001 7:12 AM
Subject: Re: off topic / traction control


> Hmmm....that seems ag'nst all logic. Normally, you lower tire pressure for
> traction and the result is also instability <g>. They had balance
harmonics
> in those things  that resulted in the inability to get the vibration out
of
> the chassis at 34 psi pressure. They found that lowered tire pressure took
> out the vibes--and gave you a smooooth ride. Unfortunately--this also
> creates more tire heat.
>
> Lyndon
>
> ----- Original Message -----
> From: Romans, Mark <romans at starstream.net>
> To: <diy_efi at diy-efi.org>
> Sent: Wednesday, January 10, 2001 10:48 PM
> Subject: Re: off topic / traction control
>
>
> > The newspaper article I read stated that the internal Ford Docs stated
> > that Ford's own internal testing showed the Explorer wasn't very stable
> > and that Ford decreased the tire pressure not for ride quality but to
make
> > the tires have less grip so it wouldn't roll as easily.  When the
dropped
> > the
> > tire pressure it would pass Ford's own internal stability test, with the
> > tire pressure
> > raised it was not stable enough.
> >
> > That's why I would sell a jeep or other really capable off road vehicle
> > before allowing
> > my kids to drive it because by design what makes a vehicle capable off
> road
> > makes it less stable on road.
> > (Narrow track, High CG).
> > Mark
> >
>
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