I ran the tall rears in conjunction with 18 fronts for about 5 years. I
found that the 19's were narrower but since they were taller they had the
same grip. Hoosier told me they were designed that way. However, if I ran
them enough, especially on concrete for about 6 events in really hot weather
(112+F), the tall rears stretched and got wider and taller, especially
wider.
Thru a slalom, the mixed sizes never felt as good, the shorter rears made
the car easier to control and a little faster thru the shortest spaced
nastiest slaloms. A little more overshoot in the back had to be compensated
for with hand input with the tall rears. I never ran the tall tires on all
4 wheels, but my experience with other cars was that the overshoot in the
front would make the car have a little less net rear overshoot in turning.
The downside is that then the car would be a litttle squishy and less
responsive to steering input overall then.
I always thought that running a little negative camber in the rear would
have helped the tall tire grip also.
Other people have also.
The most recent person to design and build a rear end on a F500 that could
put sizeable amounts of neg camber in with uprights that could assume an
angle to the main axle cut the whole rear off his car and started over
again. (rulebook heartburn). Actually, it was done about 1990 also and then
more recently in about 2004. Neither car continued production with that
"feature", as far as I know.
Chuck
From: Jim Libecco <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: [F500] Getting started in club racing
Date: Mon, 2 Oct 2006 05:59:36 -0700 (PDT)
Don't count out running both autox and club races!!!
We have done back to back
weekends.
National competetive road racing and last years solo champion.
What changes?
I used to change from 18 to 19.5 inch tires, but now would just
change the fronts and leave the tall rears on all of the time to simplify.
Just Short/Wide fronts. (10 min)
Switch brake pads (five minutes).
I used to
switch gears but might just leave them the same. Won and invitational
autox
shootout for money with road race gears in. (LOVE CVT's!!!).
Reset toe and
camber.
That is it.
Oh yeah, that extra 40lbs of ballast to be bolted into
the car due to the 493 penalty in club racing....grrrrr.
-----Original
Message-----
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