Alan Jones <alan (AT) alanjones (DOT) us> wrote in
news:l6m6q1llb2mv5nsos4ir32tavcuudj8cka (AT) 4ax (DOT) com:

Which don't do diddly to the shocks.

No, they don't either. What you're missing is that the tire
_is_ a spring, and by changing the air pressure we change the
rate of that spring.

Yeah, you do have this point right.

Since the entire content of the preceeding posts referred to
pitstops, one might wonder why you chose to make what, in
effect, was an irrelevant reply.

John

(somewhat bored, today)

On Sat, 17 Dec 2005 22:05:08 -0000, John McCoy
<igopogo (AT) ix (DOT) netcom.com> wrote:

Of course not. They're 'spring' rubbers. I'm talking about using
them with the springs, and I said you can't do much with the
shocks. (rolls eyes)

Changing the tire pressure will change the rate of the shock
and spring. The two areas work together but should not be
considered interchangeable. Other than how its pressure
might affect the shocks and springs, the tire should not be
thought of or particularly used as a spring itself. The tire is
a device for making contact with and deriving traction from
the racing surface.

You and Cru were talking about the 'broadcasts', the broadcast
personalities and pit 'reporters', when Jerry asked an out-of-the-
blue 'car setup' question; hence the reason why I changed the
subject and brought it to a new thread.

Jerry wanted to know what a tire pressure change would do,
and said nothing about the change being made during a pit stop.
You have tried to relate the question to pit stops, and to equate
a tire with being a spring.

John, since I didn't quote you in my reply to Jerry, and you don't
seem to know a lot about car setups, why did you involve yourself
in this thread yesterday?

Indeed, and that's a shame...

In article <n379q1d6mnumnhpn0qtj8vlpt94eq24lcb (AT) 4ax (DOT) com>,
Alan Jones <alan (AT) alanjones (DOT) us> wrote:



Does not change the behavior of the shock in any way.

wow.
that's rich..



Dan
----------------------------------------------
Why is it when a man talks nasty to a woman it's harassment,
and when a woman talks nasty to a man, it's 5.99 a minute?

It certainly does. In the direction of a softer tire pressure means
the shock will need to work less; thus the effects of the shock
setting will be less apparent. Again, all three areas are relational
but not exactly interchangeable.

On Sat, 17 Dec 2005 18:36:55 -0600, Chuck_Steak (AT) nospam (DOT) com (Chuck
Steak) wrote:

Chuck_Steak (AT) nospam (DOT) com (Chuck Steak) wrote in news:G8idnZIJe-i6MjneRVn-
rw (AT) rcn (DOT) net:

Humor is good for the soul :-)

John

In article <e6c9q1dcu0p55e68gf1oi6t7rijqkk538n (AT) 4ax (DOT) com>,
Alan Jones <alan (AT) alanjones (DOT) us> wrote:


The shock has absolutely no idea how much pressure is in the tire.
It's characteristics are set on the bench, and that is it.
If you lower the pressure in the tire, the shock may change in length
by .050", but that has nothing to do with dampening/bump or rebound.
And those are shock characteristics/behavior.

Tire pressure does not change the spring rate.
When you buy a spring, you buy a 400# spring.
That is it's 'rate',
Nothing you do can change that rate, save for physically altering
the spring.

It does not change the shock rate.
You change the shocks by internal adjustments
to the needles, jets, and compresion shims..

Shocks operate (in a primitive explanation),
by forcing oil through holes, not tire pressure.

Tire pressure changes do indeed change the handling of a car.
But they do NOT change the rate of the spring, nor do they
change the rate of the shocks.



Dan
----------------------------------------------
Why is it when a man talks nasty to a woman it's harassment,
and when a woman talks nasty to a man, it's 5.99 a minute?

"Chuck Steak" <Chuck_Steak (AT) nospam (DOT) com> wrote

That depends on which rate you are talking about. Bounce a tire with 10 psi
and then bounce one with 50 psi.
A tire is an air spring. While it does not change the rate of the steel coil
spring itself, it does change the "wheel rate" of the spring, i.e. the
"total spring rate"

Those changes of course do not change the mechanical components themselves,
but they do affect the total shock absorption and total spring rates.

The difference is slight but a softer tire makes both the shock
and spring work less, period.

On Mon, 19 Dec 2005 12:55:37 -0600, Chuck_Steak (AT) nospam (DOT) com (Chuck
Steak) wrote:

"Alan Jones" <alan (AT) alanjones (DOT) us> wrote

How does a "softer" tire control spring oscillation?

The amount of work or 'range of motion' is reduced. A harder,
more inflated, tire absorbs less 'shock' and transfers more of
that to the shocks and springs. This is very common sense,
easy to understand, stuff but something tells me I've hit that
familiar RASN 'brick-wall'.

On Mon, 19 Dec 2005 21:04:17 GMT, "Mark Cook" <mcook (AT) prodigy (DOT) net>
wrote: