Tire pressure in 17" on 5ktq?

[SuffolkD at aol.com]

OMG Ti:  38 PSI in a street tire?  
Is that COLD or hot?

FWIW:  I run that exact 225 45 17 size (OEM S4/TT I believe: Bridgestone 
re040 I think, on A4 knock off rims on a 200 20V.  Last week I tracked that at 
Watkins Glen with 32PSI on all fours. 70 degrees ambient.  Nice crisp turn in vs. 
26 PSI (only other pressure I tested.)

6 pounds (from 26 to 32) firmed up the sidewalls against flex, but the fear 
I'd have going higher than 32psi (like going to 38 psi COLD) is that the tire 
would make only center tread pattern contact, hence becoming tip-toe like in 
feel.

A SMART Tire equipped TT w/ 18" tires ran ~32 COLD and the Left front would 
spike 7 psi higher during laps. 5 psi if the student was smoother.  Ditto at 
NHIS months earlier where the ambient was 60 degrees.

Cautious about going over 35 on the street................
Whats the sidewall of that tire (running 38) say?
-Scott by BOSTON
> 
> Date: Mon, 19 Jul 2004 12:02:36 -0700 (PDT)
> From: Ti Kan <ti at amb.org>
> 
> Zsolt writes:
> > I am wondering what tire pressure you guys would recommend in the 
> 225/45/17 
> > on my 5ktq? What is the spec for an S4 for these tires? Would that be ok 
> > for me too?
> 
> This varies with the tire and the type of handling you seek, but I would
> run no less than about 38psi all around.
> 
> -Ti
> -- 
> R 1 3 5  Ti Kan
> |_|_|_|  http://www.amb.org/ti
>    | | |  Vorsprung durch Technik
>