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Re: How much faster are racing slicks?

To: Richard Urschel <osp13@mybluelight.com>
Subject: Re: How much faster are racing slicks?
From: "John J. Stimson-III" <john@harlie.idsfa.net>
Date: Thu, 21 Apr 2005 14:19:41 -0700
On Thu, Apr 21, 2005 at 05:12:26PM +0000, Richard Urschel wrote:
> In 1998 I measured a 2.1% reduction in comparative times between new Hoosier 
>Autocrossers (Bias-ply R tires) and Hoosier bias-ply slicks. This past weekend 
>I measured 2.4% reduction between new Hoosier Autocrossers and Goodyear 
>bias-ply slicks.
> 
> Here's what is interesting: Al Patterson (Viper) and I were running 
>comparative times last year when I was on Autocrossers and he was on Hoosier 
>Radial R tires. This past weekend we again ran comparable times with me on 
>Goodyear slicks and him on Kumho 710's.

Rich, 
There seems to have been a large improvement in R tires in the
past year.  Kumho vaulted beyond the performance level of the Hoosier
DOT Radials, and now Hoosier is playing catch-up.  I think you are in
for a treat.  And adding almost 50% more power to an Elan can't be bad
either (how much do you have now, 15HP? ;)

There's an A Prepared class RX-7 in SoCal that runs on V710s because
the owner thinks that they are faster than slicks on the local
surfaces down there.

James, 
High-power cars seem to be the ideal application for the V710.  You
need to figure out why they're not working for you!

-- 

john@idsfa.net                                              John Stimson
http://www.idsfa.net/~john/                              HMC Physics '94






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