Ferrari Mailing List: Re: Tire Pressure for Aftermarket Wheels

[Jeff Greenfield (coyote]

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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