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Author Topic: 2014 PAX Values and Deltas  (Read 6506 times)
JCHVMSC
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« on: November 22, 2013, 07:30:36 PM »

2014 PAX Values and Deltas
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« Reply #1 on: November 26, 2013, 07:33:15 AM »

Thanks for posting this!
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gunny
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« Reply #2 on: November 26, 2013, 04:41:34 PM »

H'mmm
these numbers tell me I should stay on rcomps.

Gunny
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ccann26
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« Reply #3 on: November 27, 2013, 06:39:14 PM »


  SS for 2014      .843x60   = 50.58

  SSR for 2014     .860x60  = 51.6

 those are going to have to be some very nice street tires
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gunny
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« Reply #4 on: November 27, 2013, 06:49:00 PM »


  SS for 2014      .843x60   = 50.58

  SSR for 2014     .860x60  = 51.6

 those are going to have to be some very nice street tires

Yes, my thought exactly. I used 45 seconds as my base.
Sorry but the scca is really missing on this one, How can they be so far off base?
To be competitive in Auto X is going to cost the average joe a crap load of money.

I vote for a boycott! Let's adopt a different set of rules or make our own.
Lets put it up for a vote.... Smiley (not really joking about this either)


Gunny
« Last Edit: November 27, 2013, 07:11:31 PM by gunny » Logged
whiteryder
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« Reply #5 on: November 27, 2013, 08:54:45 PM »


For the clueless among us:  How many seconds faster would you expect
R-comps to be on a 60 second course?
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« Reply #6 on: November 27, 2013, 11:44:14 PM »

The old rule of thumb was 2 seconds on a 60 second course. My guess is that street tires have improved more than R-comps since then.
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« Reply #7 on: November 28, 2013, 05:08:42 AM »

I did a test a couple of seasons back and the difference between street and rcomps was more than 2 seconds on a short course at RIR. I was in the neighborhood of 3 - 3.5 but David has a good point the street tires used today are way better then the street tires I used.

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whiteryder
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« Reply #8 on: November 28, 2013, 06:16:53 AM »


Yeah the street tires I used in my first season with VMSC were Michelin Pilot Alpin's -
not just all seasons but rated "M+S" for mud & snow.  Tongue

I wallowed in the middle-to-bottom of novice group all year until I got those Potenza RE-11s.

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« Reply #9 on: December 02, 2013, 05:45:04 AM »

Yeah, Grassroots Motorsports checked this out a couple years back, and I think maybe once more. Looks like the -2 sec for R-comps still checks out

http://grassrootsmotorsports.com/articles/measuring-up/
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« Reply #10 on: December 02, 2013, 06:51:42 AM »


That's a great article!  Really clear explanation of what they did and what they found.

However Feb 2010 was a long time ago in tire years, would be interesting to see them
do it again with today's crop of UHP and R-comp models.

« Last Edit: December 02, 2013, 10:55:24 AM by whiteryder » Logged

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« Reply #11 on: December 02, 2013, 10:38:58 AM »

Also remember that only for 2014, the minimun treadwear will be 140, and then up to 200 in 2015. I wonder if they'll adjust the PAX values again?
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« Reply #12 on: December 02, 2013, 04:03:02 PM »



 i had originally heard it was going to  bump up to 180 for 2014 now they are keeping the 140 for 2014 and going straight to 200 for 2015.

  Wonder if the plan is to make a larger pax for street tire in 2015 or if the idea is to use 2014's competition results to get a better idea of what PAX will be used for 2015.

from SCCA

"Tires in the Street Category must fit the following specifications:
1.   Effective 1/1/14 – Minimum UTQG tread wear rating of 140
2.   Effective 1/1/15 – Minimum UTQG tread wear rating of 200
3.   Molded tread depth of 7/32” or greater as specified by the manufacturer
4.   Listed in a current year of prior two years of the “Tire Guide” and/or “Tread Design Guide”
5.   Department of Transportation (DOT) approved"
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« Reply #13 on: December 03, 2013, 02:52:11 PM »

Looks like SMF (or GS) is a good place to be Smiley
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