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Re: tires

To: "Bill Babcock" <BillB@bnj.com>, "'Henry Frye'"
Subject: Re: tires
From: "kas kastner" <kaskas@cox.net>
Date: Mon, 17 Oct 2005 09:38:20 -0700
Bill's statements are so true.  Further, when I was running the Motorsports
for Nissan, I had a four session shootout to test the drivers for the new
300ZX GTO team we were forming.

The shootout consisted of four sessions and two sets of new tires for each of
the five drivers.

The first two sessions were  open practice of 20 minutes each to learn the car
and the course with that car. The lap times for all five drivers was within
.03 of a second. Obviously too close to call.

The third session was a NEW set of tires and the drivers were told to break
them in and  that they would be using these same tires for the last session
which was to really be the determining factor for driver selection. So, how
the driver used this new set of tires would determine how fast he could go in
the third session. Discipline was required here.

Three of the drivers forgot the purpose of this 10 minute second session, they
set  fast laps to be at the top of time sheet. The other two chose to  break
them in nicely and wait for the third and all telling session although their
times were not significantly slower than the "hot dogs".

This telling last session followed the "break-in"  session by just a few
minutes.The guys that listened to the rules and recommendations, broke in
their tires properly , did not allow their ego to overrule their judgment,
moved the lap times from a .03 difference to 1.5 second difference.  Made my
choice of drivers for the cars quite easy.
  ----- Original Message -----
  From: Bill Babcock
  To: 'Henry Frye' ; fot@autox.team.net
  Sent: Monday, October 17, 2005 7:53 AM
  Subject: RE: tires


  As I recall it was an assumption and Uncle Jack started it. I always figure
  that once anything with any degree of subtlety is discussed people will
  start noticing the phenomenon whether it's real or not.  Canals on Mars.
The
  only way to really know would be to take measurements, and no one is going
  to take the time to do that. There are lots of other factors that could be
  causing tire wear, including the happiest one--people are going faster. The
  experience level of the group is growing steadily.

  I constantly remind myself that bike racing is different, but it provides a
  simple model (and most of my experience base). I know for sure that in a
  bike race, one lap of pushing extra hard can finish off your tires. It's a
  common phenomenon to see a racer pull out an early lead, and then fade to
  mid-pack because he used up his tires getting to the front. It's also
common
  to see a racer who conserves his tires finish a race near the front with
  tires that look just fine and check out with a durometer as still usable at
  the same time that a guy who finished at the back of the pack completely
  toasted his tires and finished on threads.

  I figure with cars it's even more of a downward spiral--small alignment
  changes, pushing harder in the middle of a corner, becoming more
comfortable
  in a drift, a bit more horsepower--all increase the tire temperature. As it
  increases, the car slides a little more, the driver pushes a little harder
  to not lose position, and temperature increases more. A couple of laps of
  that and your tires are done.

  The answer: Slow down. Okay, wrong answer. But a conspiracy by Hoosier to
  sell more tires, or just use cheaper compound, is not the only logical
  answer why a significant number of people are using tires up quickly. That
  doesn't mean Hoosier didn't, and I'll be watching closely for Aye-Rabs in
  Indiana.

  -----Original Message-----
  From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On Behalf
  Of Henry Frye
  Sent: Sunday, October 16, 2005 10:45 PM
  To: fot@autox.team.net
  Subject: Re: tires

  The recent talk here about Hoosier changing the compound this year of our
  Vintage TDs had to start somewhere...

  Does anyone remember where?


  Sent from my PDA  -  Sorry about brevity and typos

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