[urq] Tire pressure for ice racing ?

[qshipq at aol.com]

 At Steamboat Springs Ice track with the urq, we run between 24 and 26psi with WS50 Blizzacks.  For the urq on ice, the best pressure will be lower, generally 24-28psi.  I run to the low end of that using innertubes, but it really depends on the tire size, a 205 on a fuch 15x7 will tend to pop it's bead when encoutering a snow patch at 25psi (btdt), but a 205 on a 6in rim or a 215 on a 7 should be fine.  

The studded/bolted/spiked  tire will always have the advantage on an Ice track.  At Steamboat, none of these are allowed, but usually in Ice racing competition, non-studded ice tires are in a separate competition category.  I also suggest that you run the center locked always.  I also run the rear locked, but can be a handful in a tight competition course.

HTH and good luck

Scott J
84 Urq
83 Urq ice track car


 

 

-----Original Message-----
From: Louis-Alain Richard <laraa at sympatico.ca>
To: vittorio at mybares.com
Cc: urq at audifans.com; quattro at audifans.com
Sent: Fri, Feb 12, 2010 8:35 am
Subject: Re: [urq] Tire pressure for ice racing ?


Thanks Vittorio,

 

So lower pressures are better on ice ? Interesting, since higher pressures are 
the way to go on tarmac… I’ll try that next week for sure.

 

Would you try to cure the inherent understeer by dropping the fronts more than 
the rears ? 

Or would you unlock the rear diff ?

 

About the different tires, the real snow tires are the Pirelli (very open tread) 
and since they are not ice tires, they propose to stud them. Nice, the only 
drawbacks are bad dry-cold tarmac traction, and noise.

But the question is : can a studless expensive tire like the Michelin be any 
good on ice ? Or at least, as good as the Pirelli ? I’m sure this Michelin won’t 
be any good in deep snow, the tread is not enough aggressive, but on ice, with 
its multiple sipes and its very soft rubber, I guess it could work. What do you 
think ?

 

Louis-Alain  

 

 

 

De : vittorio at mybares.com [mailto:vittorio at mybares.com] 
Envoyé : 12 février 2010 01:02
À : Louis-Alain Richard
Cc : urq at audifans.com; quattro at audifans.com
Objet : RE: Tire pressure for ice racing ?

 

On lake ice, I'll start at 26psi, and will typically endup in the low 
20's...depends on conditions.

 

But, yeah, regardless if you're on studs or super snow, drop the pressure and 
you'll get better traction - but there's lots of variables:

-- how deep is the snow

-- how wide are the tires

-- what type of tread block are you running

-- temperature

-- etc...

 

-------- Original Message --------
Subject: Tire pressure for ice racing ?
From: "Louis-Alain Richard" <laraa at sympatico.ca>
Date: Thu, February 11, 2010 6:25 pm
To: <urq at audifans.com>, <quattro at audifans.com>

Since I have at least 2 other outings this winter for some hot (cold ?) laps
on an ice track, I was wondering if I can improve traction by playing with
tire pressure and tire type.