rec.autos.simulators

    I've just done a PB of 1:27.88 in the F1 Eagle at Monza.  After several
practice session laps I came to a stop after the S/F line (without
screatching the tires) and took a look at the tires.  Each tire has equal
temp.'s across the tire, each tire is at 25lbs hot.  The rears are identical
to each other at 242*F, The LF is at 230 and the RF is at 225.  What is the
ideal temp.s and ideal pressures for each wheel?

    I can lower the rears by maybe as much as 10*F with little sacrifice in
proformance but not knowing what the Ideal temp is I don't want to do that
yet.

The ideal pressure is when the middle temperature of a tire matches the
tire's outside and inside temperature. It's described in the Bib..,uhm,
in Steven Smith's book.

As for ideal temperature, is there such a thing? There's no way for us to
control the temperature so it's not feasible to ponder over it.

So if your tire temps are at 7000 degrees and you're clocking 3:12 laps
at Spa, you'll sacrifice thirty seconds of lap times to reduce temperature?

Better yet, you can keep the tires at 20 centigrade by turning off the
engine and staying still. You should optimize your driving for speed,
and nothing else. (except consistency, but let's not get pedantic)

+Cinquo [36.xx]

Wait a *minute*!!!  Yer doing 1:27s at Monza with a F3 engine in a F2?!?!?!?
Quick--get me Chip Ganassi on 2!!!

Anyway, there *is* an ideal tire temp, but Papy never said what it was.
Under 150 deg. the tires are pretty slippery (check the temps at the S/F
after yer out lap; that should be abt. the min.), and at over 300, we're
talkin' hot snot on a glass door knob (F1s at, say, Homestead).  My guess is
180 to 220 is optimum.

You don't have to bring the car to a stop, unless yer online.  In Training
mode, just hit Esc. and winkel yer way back to the garage.  Nor do you have
to be anywhere near the S/F line.  If you think the Curva Grande is the key

what yer tires were doing while you were in the CG.  (At some tracks, like
Zandy, the tires will have cooled off somewhat between the last turn and the
S/F.  At others, like the O'ring, the tires are probably still too hot at
the S/F from the last corner.)

For slightly more traction, the middle temp can be a deg. cooler than the
outer & inner (good at slow tracks like Monaco and Sears Pt.).  For slightly
less rolling resistance, the middle temp can be 1 or 2 deg. warmer (good on
fast corners and ovals like Indy & Pocono).  If you can't get the inners and
outers even, err on the side of hotter inners for more camber thrust (which
I *hope* I covered in the book).

"Bissy"?  "Screatching"?  Are you in the same school system as my kids?

--Steve Smith

According to Carol Smith optimum is between 220*F and 250*F.

TJ

    um.. er.. yes!  with a bit of nitro ;-)   I don't like F1 because of
what I mentioned in that post.  These tire temps are from an F1 Eagle
though.  Monza is the only place where F1's are ok (to me) to drive.

    I remember someone saying 180 but that was quite some time ago.  And
with the information being tossed around and updated and changed on almost a
regular bassis, I don't know what the optimum temps would be.  Looks like
I'll have to soften the rear  or raise the car a bit to cool the tires.

    At the S/F the outer edges have had time to cool off and with braking
with the camber the insides have heated or haven't cooled as fast as the
outer.  I knew by screatching to a halt that the temps would be screwy so I
came to a controled easy stop.  even then There's a bit of a temp difference
extanging.  With the tires being equal across the tire/tires I know the out
side edge of the out side tires were hotter then the inside and middle while
going through the turns, but the car feels almost perfect so....  I just had
to find out what the optimums should be so I can attempt a better and longer
lasting setup.

Thanks Steve,

That's Carroll--not Carol--Smith (no relation).

In the real world (or in ICR/CR), the optimum temps depend on the compound
(lower temps work better for softer ***).  Carroll is also probably
talking about a later era (his heyday was in the 1970s).  Real-world 1967
tires tended to be rock-hard, thus demanding higher temps, but my experience
with the game tells me that lower temps offer a better purchase.

The question not asked was, What's the optimum *hot* tire pressure, assuming
you can equalize temps across the tread?  Empirical evidence suggests 24-27
lbs. (lower for more grip, higher for more sidewall stability--apparently
modeled in the game--and lower rolling resistance, for a higher Vx).

--Steve

Sorry for using metric values, but in my experience the tyres are starting
to lose grip when running at 125* Celsius or more. Anything below that seems
OK.

Bye,
Leo