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PostPosted: Wed Nov 29, 2017 5:11 pm 
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11/29/2017—NASA 2018 Super Touring 1-4 and Super Unlimited Rules Released!

The 2018 version of the NASA Super Touring 1-4 & Super Unlimited Rules will be posted in the next few hours on the NASA Rules page. https://www.nasaproracing.com/rules

As in past years, NASA Time Trial classing will mirror classing of the Super Touring and Performance Touring series, so TT drivers can use these rules for purposes of 2018 TT classing as well.

There have been some changes made in the annual revision process, and they are noted by the blue text. Competitors may notice that the actual font and formatting of the rules has been improved for easier reading. The big change for the series is the addition of the ST5 class, but with the disparity between the rules for the new ST5 class and the ST1-ST4 classes, it was decided to separate those rules into an entirely different rules file.

One of the changes to the ST1-4 rules, brought about by driver input over the season, is rule 6.2.1.1h that allows for reinforcement of suspension mounting locations for strengthening purposes only. Another is that NASA has developed its own method of measuring tire width, called the NASA Section Width measurement, along with measurement tools that will be available in every region and templates for those tools in a .pdf file on the NASA Rules page. The NASA Section Width measurement will take the place of previous rules regarding tire size, with a transition period for ST1-4, but immediately for the new ST5 class. NASA will notify competitors via a Technical Bulletin when the transition will be completed, but it is anticipated in less than 6 months. This measurement will even out some of the tire width issues we have seen over the year in part due to wheel sizing, without having to actually limit or measure wheels. There is a minor change in the Modification Factor for the 245 size or smaller (NASA Section Width 266mm or smaller) from +0.7 to +0.6, and we have added a Modification Factor for UTQG Treadwear 200 or greater tires in all classes.

The only other major change is the method of calculating the Average Horsepower (Avg HP). While a little more complicated, it should provide a better approximation of the horsepower available over a range of usable RPM. As in the past, if a competitor does not want to do any of these calculations, the Maximum Horsepower can always be used to calculate the Adjusted Wt/HP Ratio instead! The improved method has more data points to be evaluated with a switch from looking at the HP in 500 rpm increments to 250 rpm increments. As well, the number of data points used for the actual calculation will depend on the engine’s rpm redline. Larger, lower revving engines will use less data points, and the smaller engines that rev higher will use more data points giving them a measurement of a wider rpm power band.

Have a great 2018 season, and we will see you at COTA in September for the once again unified NASA National Championships!

Greg Greenbaum, M.D.
NASA National ST/PT/TT Director

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PostPosted: Wed Nov 29, 2017 7:37 pm 
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The rules are posted.

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PostPosted: Wed Nov 29, 2017 8:46 pm 
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Thanks for posting. Knowing that the Hoosier 245 is the most popular tire and size used in ST4, curious what measurements NASA has taken/recorded with various popular wheel sizes such as a 9" or 9.5" inch rim. In other words, would the expectation be that the 266mm/10.4in max section width only be possible using a 8.5 inch rim with the 245 Hoosier? Doing a quick check even with a 9" rim, it looks like 266mm is going to be tough using the Hoosier 245.


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PostPosted: Wed Nov 29, 2017 10:01 pm 
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jonb94118 wrote:
Thanks for posting. Knowing that the Hoosier 245 is the most popular tire and size used in ST4, curious what measurements NASA has taken/recorded with various popular wheel sizes such as a 9" or 9.5" inch rim. In other words, would the expectation be that the 266mm/10.4in max section width only be possible using a 8.5 inch rim with the 245 Hoosier? Doing a quick check even with a 9" rim, it looks like 266mm is going to be tough using the Hoosier 245.

Our research showed that the 9" rim puts the tire at about 264mm, and definitely fits. We didn't have a 9.5" wheel for testing, but it certainly might fit as well. We would not expect a 10" to allow the tire to fit, but that is past the manufacturer's recommended size as well. The choice for 266mm NSW and not higher was that it was approaching the 275 tire size NSW.

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PostPosted: Thu Nov 30, 2017 7:10 am 
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Do you have the base testing data available for those popular ones? Like 275 hoosier on 9.5 or 10 and bfg's on 9.5 or 10, etc? As in you know already what combos for sure aren't going to cut the mustard.

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PostPosted: Thu Nov 30, 2017 10:09 am 
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When will the Nasa Section Width gage specs be available?


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PostPosted: Thu Nov 30, 2017 12:38 pm 
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What size tire, in regards to diameter, was being tested above? The Hoosier R7 has a 10" section width in a 15" diameter but it is 10.3" in 17" diameter.


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PostPosted: Thu Nov 30, 2017 1:37 pm 
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Thank you for all the hard work!

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PostPosted: Fri Dec 01, 2017 3:09 am 
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Balroks wrote:
Do you have the base testing data available for those popular ones? Like 275 hoosier on 9.5 or 10 and bfg's on 9.5 or 10, etc? As in you know already what combos for sure aren't going to cut the mustard.

Hoosier 275 (both 17 and 18's) should fit the 282mm tool on 10" wheels. Not sure about the BFG's
The 255 x 18 will not.

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PostPosted: Fri Dec 01, 2017 3:11 am 
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DanielsDM wrote:
When will the Nasa Section Width gage specs be available?

The specs are in the rules. The templates were supposed to be posted yesterday, but IT is at the 25 Hour, so it might be delayed. I'll see if they can get them up today, though.

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