So rules have been posted as promised yesterday. Worth noting is the new tire "section width" measurement which will become law ~6 months into the season. For now they're letting us use what we have. Has anyone seen this measuring tool yet or decided to make one? I'd think one of ya'll could do this outta plastic pretty easily.

https://nasaproracing.com/rules

 

Here's a snippit:

4)
“NASA Section Width”
DOT tire width is determined by a measurement of the “NASA Section Width” of the largest tire (if staggered sizes) on the vehicle in post competition impound/inspection, without changes to tire inflation (may be allowed to cool to pre competition pressure). The tire may be measured while off or on the vehicle at any location not affected by ground contact sidewall deflection. A tire's NASA Section Width is the measurement of the tire's width from its inner sidewall to its outer sidewall using the NASA Section Width tire measurement tool(s) (excluding any protective ribs, decorations or raised letters) at the point 30mm deep to the tread surface on a new tire.





If a worn tire on the vehicle is found to be out of compliance in impound, the
competitor has the option to bring a new tire, on the same wheel type/size, and at the
same tire pressure, to retest for compliance. Similarly, a competitor may
protest another’s worn tire thought to have been non compliant at the start of
competition. However, the protesting competitor may need to obtain the new
tire and pay for dismount and mounting fees if a new tire/wheel combination is
not readily available. If the tire is found to be non compliant, those fees must
then be paid by the competitor with the non compliant tire.
NASA Section Width tire measurement tools should be available at each NASA
region technical inspection/impound area. Additionally, templates for each tool size
are available in a separately posted .pdf file on the NASA rules page.
NOTE! NASA Section Width measurement often DOES NOT correlate with the
tire size printed on the tire by the manufacturer, and wheel width will
change the NASA Section Width measurement. For example, a tire designated as a 245 by the
manufacturer may not fit the 257mm NASA Section Width measurement tool. Use caution
when selecting wheels and tires, and consult your regional series leader if you have questions.

 

Do you have a copy of the 2018 TT rules? It seems like all the links on NASA website are broken.

My understanding is that TTC/TTD got combined to form TT5?

Thanks.

 

Use the ST rules, they're exactly the same for classification. And yes C and D are now 4 and 5.

 

Thanks. Seems like the links got fixed overnight.

One question on aero:

Does the Evo qualify for the BTM Modification Factor?

I have read that section a few times, and don't really understand the intention of this section. It seems like the RS model can take that modification factor.....so would a GSR/MR model be able to use that also?

 

As long as they ran wingless yes. Don't have to be an RS trunk just has to cover the holes. Retarded, I know. Look down further and you'll see the various mustangs and corvettes allowed to run the wider fender arrays, just so long as they're "wingless"....

 

So I purchased Thai Diep's 2006 Evo RS out of the NASA Northeast region in December. It holds multiple NASA TT3 and TT4 track records. I plan to run it in TT4 this season, and I dynoed it and weight it this weekend. Here is my NASA TT Form:

284 max whp
3301 lb competition weight
+.1 weight
+.6 245/266mm DOT tires
+.2 4 Door Sedan
-.5 AWD TT4
12.04:1 weight : power ratio (TT4)

Here is my NASA TT4 dyno tune:

 

how much boost?

also curious - why the change over the s2k?

 

Looks like some nice boost control there to get the HP that flat.

 

They...may...call out the blue one because it's funky. Also the green one needs to hit rev limit like the other two since it doesn't "drop" for "1500 rpm". At least at nationals, your regional may not care but with the new upload system Greg may be browsing them randomly. And about time you got on here Did you print the tire tool yet for your 9.5's?

 

I wasn't in the car to monitor, and I had to lower the WGDC to get it to the 284 whp I was shooting for, so I don't honestly know. I wanted something that I could run TT4/TT3 in, and my S2k with a GTX3076R already struggles to stay under the 321 whp @ 3,000 lb setup I ran for TT3.

 

Yeah Thai had the car tuned pretty well it was really just making some WGDC changes to try and keep it as flat as possible.

 

Yeah the dyno RPM pickup was struggling to get through an entire run without a hick up. There were two or three bad RPM values in the blue plot, and the green plot had one phantom RPM value at 9000 RPM that was clearly not real. We ran it like 6 times just to get 3 somewhat useable plots. Their OBD port thing didn't connect to my car (not NASA dyno legal), and I don't trust doing RPM by gear ratio, so this was the best option we had. If Greg doesn't like it, he can pay to have it done again. This was at my local NASA region dyno day, and I drove 3.5 hours each way to get these plots done. It isn't my fault that the dyno had some RPM issues. I haven't printed the template yet. I spent yesterday removing the OEM front belts and readjusting the 6 points for me and my student trying to take some weight out. Up next is the airbag and a diet for me.

 

Cool, keep up the progress.

 

for national, i would just pay $100 to get it dyno there that week just to make sure your hp is not over their dyno, because that's the only dyno that counts for that weekend. i have always done that at Nat events. and i have always used max hp for avg since my hp curve is pretty flat, and not have to deal with all those print out and calculations.