Ferrari Mailing List: Re: Tire Pressure for Aftermarket Wheels

[Tom Reynolds (kjtar]

Or when you track/autox, use a pyrometer and measure in/middle/out and
adjust accordingly.

----- Original Message ----- 
From: "Dennis Liu" <bigheaddennis [at] gmail.com>
To: "Tom Reynolds" <kjtar [at] cox.net>
Cc: "'The FerrariList'" <ferrari [at] ferrarilist.com>
Sent: Sunday, November 04, 2007 9:18 AM
Subject: Re: [Ferrari] Tire Pressure for Aftermarket Wheels


big snip

> For example, if you're going with modern 18" rubber, particularly if it's
a
> "max performance" or "ultra high performance" compound, and you're driving
> it mostly in warm temps (60F-80F ambient), and you'd like the car to be
more
> neutral in handling, I'd go with 34/32, front to rear (measured cold).  If
> it's hotter than that, drop a pound or two (tires will heat up more).
> Maximum stick on street tires come around 40 lbs hot, and if you drive
> aggressively on the street, it's easy enough to add 4+ pounds (10+ lbs on
> the track).  More pressure increase in the rear for a mid-engined car,
> particularly on a fat pig Testarossa.  For street use, I'd like to shoot
for
> a target temp of 36-38 lbs HOT.  The ride will be a little stiffer, but
> you'll enjoy yourself more.
>
> BTW, the old trick of chalking the sidewalls and measuring roll over that
> way?  Forget it.  Not nearly as useful in the day of rubber-band tiny
> sidewalls.
>
> Just my $0.02.
>
> Vty,
>
> --Dennis
>
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