rec.autos.simulators

First off I'd like to express my thanks to Jim Sokoloff for all his
efforts and patience in trying to answer all the questions and
opinions posted to this newsgroup.

I do have one wish that I don't think I've seen posted before, so
forgive me if this has been answered already. I really miss the HOT
tire pressure info that was in N1. I always used that in conjunction
with the tire temps to adjust my setups, just as we do with our real
race car. I know everybody has discussed the affects of the "spring
rate" of tires, so it seems we are missing some valuable info about
the way the tires blow up under stress.

Perhaps with the radial nitrogen filled tires this really is'nt a
factor as it is with bias ply tires filled with air. But if the
pressures are increased with heat, I'd like to know how much blow up
is happening so I can change the shocks or weight to compensate.
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If you go out and drive some laps in practice you can get the current hot
readings
of the tires - just like real drivers do.  I think this model is more
realistic.
/THansen

Dried nitrogen obeys the ideal gas law even better than plain old air.
(Since air has water vapor, which is somewhat non-linear)

Chemistry 102: (Ideal Gas Law)
PV=nRT

P = pressure
V = volume
n = amount of gas (in mass or mass equivalent units)
R = ideal gas law constant
T = temperature (on an absolute temperature scale)

Since n and T are perfectly constant (and V is almost constant), you
can generalize the pressure to be completely linear with temperature.
(remember to add 483 degrees to the displayed Farenheit temps to
convert to Rankin to use in the above formula.)

(Of course, after that explanation, it occurs to me that it's
obviously easier if we would just calculate it and display it for you,
which we don't currently do... :-) )

---Jim Sokoloff, Papyrus

A suggestion for NASCAR 3: I'd like to be able to "examine" the tires after
a pit stop, especially during practice sessions, so that I can see if I
have a camber problem.

Dave Sparks
IWCCCARS Project: http://www.theuspits.com/iwcccars
Late Night League: http://www.sequoia-dev.com/Hawaii/latenite.html
Hawaii Handle: davids

I agree with Rich on this one

BTW Rich you said you race cars for real? If you do you have a great name
for a racer  "Rich Wicker takes the checked flag!!" :)

Thanks for the input Tom an Dave , but I don't think you understood my
original post. I was asking about the hot tire PRESSURE not the
temperature. If the pressure increases then the spring rate is also
increased.

I realized after the last message that we just check pressures with a
tire gauge in the "real" world. I would just like to see the old
feature put back in instead of frying my calculator after every run
<grin>

Rich