2010 PAX INDEX
01-02-2010, 09:08 AM
#1
Race Director
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2010 PAX INDEX
I found the numbers for CSP and the STR to be a huge difference. The only difference for my 944NA will be tires and rims.
2010 PAX/RTP Index
"Racers Theoretical Performance"
This Index was developed by Rick Ruth and reflects study of results from over 200 nationwide Solo events including, the Tire Rack® Solo National Championships, National Tour, Atlanta Region, Chicago Region, California Sports Car Club, Central Florida Region, Great American Solo Series, Hawaii Region, Houston Region, Midwest Divisional Series, Milwaukee Region, New England Region, Northwest Region, Northern New Jersey Region, Oregon Region, Philadelphia Region, San Francisco Region, San Diego Region, South Jersey Region, St. Louis Region, Tri-State Sports Car Council, Texas Region, Washington DC Region, Wisconsin Autocrossers Inc., and many others.
note: classes marked with an * include changes made in the stock class shuffle or are new classes (STR and SMF).
SS 0.860 ASP 0.871 XP 0.890 AM 1.000
AS* 0.854 BSP 0.865 BP 0.875 BM 0.965
BS* 0.847 CSP 0.863 CP 0.866 CM 0.915
CS* 0.840 DSP 0.849 DP 0.874 DM 0.913
DS 0.825 ESP 0.852 EP 0.873 EM 0.907
ES 0.829 FSP 0.838 FP 0.876 FM 0.908
FS 0.837 GP 0.850 FSAE 0.960
GS 0.812 ST 0.824
HS 0.803 STS 0.826 F125 0.959
STR* 0.842 FJA 0.869
STX 0.830 FJB 0.834
STU 0.844 FJC 0.772
SM 0.877
SMF* 0.870
SSM 0.883
"Racers Theoretical Performance"
This Index was developed by Rick Ruth and reflects study of results from over 200 nationwide Solo events including, the Tire Rack® Solo National Championships, National Tour, Atlanta Region, Chicago Region, California Sports Car Club, Central Florida Region, Great American Solo Series, Hawaii Region, Houston Region, Midwest Divisional Series, Milwaukee Region, New England Region, Northwest Region, Northern New Jersey Region, Oregon Region, Philadelphia Region, San Francisco Region, San Diego Region, South Jersey Region, St. Louis Region, Tri-State Sports Car Council, Texas Region, Washington DC Region, Wisconsin Autocrossers Inc., and many others.
note: classes marked with an * include changes made in the stock class shuffle or are new classes (STR and SMF).
SS 0.860 ASP 0.871 XP 0.890 AM 1.000
AS* 0.854 BSP 0.865 BP 0.875 BM 0.965
BS* 0.847 CSP 0.863 CP 0.866 CM 0.915
CS* 0.840 DSP 0.849 DP 0.874 DM 0.913
DS 0.825 ESP 0.852 EP 0.873 EM 0.907
ES 0.829 FSP 0.838 FP 0.876 FM 0.908
FS 0.837 GP 0.850 FSAE 0.960
GS 0.812 ST 0.824
HS 0.803 STS 0.826 F125 0.959
STR* 0.842 FJA 0.869
STX 0.830 FJB 0.834
STU 0.844 FJC 0.772
SM 0.877
SMF* 0.870
SSM 0.883
01-02-2010, 11:07 AM
#2
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Yes, if you compared a CSP Miata on 245 width street tires to an STR Miata, you're going to see very little difference. But if you put a top driver in the car and compare STR to the letter of the rule, and CSP to the letter of the rule, the CSP car will be significantly faster. Putting 285 width Hoosiers on a Miata makes a huge difference in time.
01-02-2010, 12:05 PM
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CSP has no wheel or tire width limit. This means you can put much more rubber on the ground. There's nothing stopping you from putting 285/305 tires on 11" rims on a 944 in CSP but not in STR. Also remember that the PAX is not sanctioned by SCCA and is not used in any National or Divisional level competition. Its only an unofficial guideline that some people use to compare cars in different classes.
01-02-2010, 01:51 PM
#4
Race Director
Thread Starter
CSP has no wheel or tire width limit. This means you can put much more rubber on the ground. There's nothing stopping you from putting 285/305 tires on 11" rims on a 944 in CSP but not in STR. Also remember that the PAX is not sanctioned by SCCA and is not used in any National or Divisional level competition. Its only an unofficial guideline that some people use to compare cars in different classes.
01-02-2010, 03:53 PM
#5
0.863 versus 0.842 is about a second and a half on a sixty second course - seems like the right ballpark to me.
The SCCA Pro Solo indices are distinct from, although similar to, the PAX / RTP indices.
The SCCA Pro Solo indices are distinct from, although similar to, the PAX / RTP indices.
01-03-2010, 03:06 PM
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Partially true. The Pro Solo PAX is different than the standard PAX. The numbers are developed by the ProSolo folks and are sometimes numerically differ from the "normal" PAX to account for the extra importance of drag race type launches and extremely short courses. It is used during the challenge rounds to figure out handicaps when cars from different classes run against eachother. It is also used in L1, L2 and the Indexed Race tire class (Prepared and Modified)
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01-17-2010, 02:58 PM
#8
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First off Boxster and Cayman are in BSP not CSP. But you could put short 10" wheels all around and go with 275/15 or 255/16 or 295/17 or even a 315/17. No idea what would actually fit or be fastest but since you can update/backdate brakes and offsets and widths are unlimited you could put almost anything under a boxster. The joy and problem with Street Prepared is the vast number of choices you get to make. It can be very expensive to try everything until you get the right combo but cars prepared to the SP limit can be very fast indeed.
