Ferrari Mailing List: Re: Tire Pressure for Aftermarket Wheels

(continued)

As it was pointed out to me if the bead is bent, crimped or otherwise 
"askew"..... it won't hold air long.... and  to answer your question I 
barely check them monthly..... oh and....  gumball

----- Original Message ----- 
From: "LS" <lashdeep [at] yahoo.com>

To: "JB" <barchetta [at] verizon.net>

Cc: "The FerrariList" <ferrari [at] ferrarilist.com>

Sent: Wednesday, November 07, 2007 7:37 PM

Subject: Re: [Ferrari] Tire Pressure for Aftermarket Wheels
Who checks their tires weekly?
I'm asking because a car that I haven't driven in a week and a half has a 
flat...it's on an R Compound Hoosier that is so stiff, it doesn't even 
look down, yet it shows 9psi on a tire gauge.
BTW-Handles pretty good with 9psi. The Hoosiers heat up evenly with 
18-20psi (FR) on my 3295 lbs curb weight, 55%FR/45%RR, RWD, V8 car.
Toyo RA1s are good with 22-24 psi on my 2850lbs curb weight, 54%FR/46%RR, 
RWD, V8 car.
And, I hope nobody out there is aligning their Ferrari with less than 
factory specified (and thus performance oriented) specs. Buy a Honda 
minivan, like I did, if you're worried about tire wear!
LS
----- Original Message ----
From: Jeff Greenfield <coyote [at] acme-ltd.com>
To: LS <lashdeep [at] yahoo.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Sent: Wednesday, November 7, 2007 6:17:39 PM
Subject: Re: [Ferrari] Tire Pressure for Aftermarket Wheels
In addition to what Dennis wrote below, after you find pressures that
feel good, check the tires for uneven wear after a few thousand miles.
Most modern RWD cars with fat tires will tend to wear the rear tires
more in the middle, and the fronts on the outside edges.
If you want to maximize tire life, you may need to find a compromise
between what feels good, and what works for wear.
Jwff
Sent from my iPhone
On Nov 7, 2007, at 12:55 PM, Dennis Liu <bigheaddennis [at] gmail.com> wrote:
IMHO, while this is a great technique for track use, it's not that
helpful
for STREET use.
It's like dressing for a January day.  Do you wear the winter parka,
or just
the light windbreaker?  Depends on whether you're going to watch a
football
game or going for a 5 mile run.
Tire pressure for track use is different from tire pressure for
street use.
If your suspension is set up for aggressive track use (e.g., plenty of
negative camber), you'll never achieve even tire temps across the
treadwidth
unless you are SERIOUSLY HAMMERING IT on the street (beyond the
point of
sanity).  The only way to get uniform tire temps in that
circumstance would
be to lower the pressure so much you'll suffer major handling issues.
Conversely, if you've got your suspension set for street/comfort
use, if you
do some hard cornering with it, you'll end up with uneven tire temps
(hot
outside, cooler inside) that you won't be able to correct for using
pressure
unless you crank up the pressures way too high.
Bottom line, it's actually not that hard - just start with a set
pressure,
drive, and see how the car feels (given your standard driving
conditions).
Adjust up and down, and be happy with whatever you like the most.
It's not rocket science, folks.
P.S. for Chuckles, living in the land of long straight roads
punctuated by
periodic stop signs and 90 degree turns, he really should consider
setting
the car up so that he's not blowing through new sets of tires every 5k
miles.
vty,
--Dennis
-----Original Message-----
From: LS [mailto:lashdeep [at] yahoo.com]
Sent: Wednesday, November 07, 2007 12:40 PM
To: Dennis Liu
Cc: The FerrariList
Subject: Re: [Ferrari] Tire Pressure for Aftermarket Wheels
Go on a hard, curvy drive and have someone with a pyrometer check
temps
across the tread...when they are withing 5 degrees from inside to
outside,
you have the right temp.
LS
----- Original Message ----
From: Charles Perry <charles [at] carolina-sound.com>
To: LS <lashdeep [at] yahoo.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Sent: Sunday, November 4, 2007 9:09:06 AM
Subject: [Ferrari] Tire Pressure for Aftermarket Wheels
What is the list's opinion on picking a tire pressure for aftermarket
wheels where the wheel differs signficantly from stock?
I ask because of my TR. It had the metric wheels when I bought it,
so I
bought a set of 18" HRE wheels from Karl early on. They are obviously
very different from the stock wheels in both sidewall height and
construction, so I always picked the tire pressure by looking at the
max
rating on the tire and backing it down some (like if the tire said 51
psi max, I would run them around 44-46. This is very unscientific. I
haven't seen uneven tire wear, so by that measure I assume it was OK.
Is there a way to calculate the best tire pressure? Should I pick the
factory recommendation from the 512TR since its wheels are nearly
identical to my current ones in terms of size?
I did Google the subject but only seem to get car-specific wheel
recommendations.
-- charles

--------------------------------------------------------------------
                         Charles G. Perry IV
Carolina Sound Communications          (843) 571-4488
1941 Savage Rd., Suite 200G            (843) 571-4492 fax
Charleston, SC 29407                    www.carolina-sound.com

     "The problem with doing things right the first time is that no
           one realizes how difficult it was."
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Re: Tire Pressure for Aftermarket Wheels	<– Date –> <– Thread –>
From: Jim and Cheryl Brown (barchettaverizon.net)
Date: Wed, 7 Nov 2007 16:43:37 -0800 (PST)