Someone correct my spelling fubar lol.

Now including some ST4 stuff as well as some aero adjustments. Linking the page instead of the PDF in case there are changes (scroll down to ST):

https://nasaproracing.com/rules

I don't think any of us are considering TT4 but worth noting in TT3 they are now saying the front splitter can go to 6" from the widest "side" and 12" from the "front". So who knows a good carbon guy .

 

I've tried to understand the NASA rules for 2016 and was a little lost. Trying to build for TT 3/2(I think). Maybe someone can help me understand where my car would wind up lol.

 

For you? TTU or ban!

Nah but fire away. Get specific.

 

I guess I dont have much specific until I get the car weight, and a current tune on e85.

I guess more so about mods, points added or subtracted, tire classing etc.

I plan to run stock turbo, gut car plus cage. On that assumption I'd guess TT2/3. I believe TT1 is closer to TTU right?

I'm not ready by a long shot, as I also understand you have to HPDE until the regional director gives you a license or something.

 

Pretty much on point. Time and time until you find the formula for yourself and the car. Sticking with the stock frame turbo and adding safety are also on the right path. Tire wise shoot for 275 width's to keep things a bit easier at first so you don't have to bother with all these control arm/fender/etc modifications yet. TTx will be there when you're ready. If you're gonna buy wheels go 18's now cause you'll just end up on them at the end anyway. Then focus on the seat/hans/cage/fire sys/etc cause those rules won't change regardless of speed.

I might even suggest keeping her on 93 for now because of the logistics of carrying e85 around for HPDE duty seems a waste unless you're already doing it.

 

Am I reading this write that they went to avg hp calc for adjusted hp/wt in all classes not just ST3/4?

 

What is the advantage of 18" wheels, long term? Tires cost more, the wheel/tire is usually heavier, etc. If you don't need the clearance for bigger brakes, is there a performance advantage over 17s? Is it an advantage with a 18x9.5, or is it only an advantage if you go to a 10" or 10.5" width? Or is it a tire availability issue?

Years ago, when I was tracking more, I actually found I preferred 17s. The car felt lighter, more responsive and more stable somehow. Maybe it was just me...

 

Think of it as a supporting mod more then a budget mod. Used tires are more plentiful, the tire guy at the track always has 18's, no limit on brakes, more granular selections, holds value better, yada yada. I have one of my original 17 set's still but thats only for rains. In 8 years of doing this I've owned likely 5 sets of 18's.

 

Yep they said they were gonna move to it if it was successful in 3.

 

Ive been on 18s for years. Presently running NT03 18x10.5 with 275 NT01 for tires.

Also my truck gets e85 almost exclusively, so whatever I dont use at the track will go into the truck for the drive home lol

 

Also with a 18" wheel it could help get more MPH out of each gear. I've got the TRE Stage 3 with JDM 5th gear so this was also a consideration when I worked with Jon to figure out top speed/gear.

 

Are 18s worth it over 17x9.5s if you don't go up to at least a 10" width?

 

It comes down to wheel/tire height. The width is more rotational mass but with an appropriately wide tire I feel like the grip outweighs the added mass. But thats just my research based on others feedback.

An 18 with 35 profile tire which I'm running(vs a 17 with a 35 or 30)means more mph. Depending on track or course, hopefully I wont be bouncing off limiter approaching corners and limiting unnecessary shifts. There are calculators available to help figure this out. Including on TRE's website.

http://www.teamrip.com/gear_ratio_options.html

 

depends on how long you plan to do DE to get to point where you can start to do TT, you could stick with 17" wheels for now since tires are cheaper for DE. there still a decent selection of used tires for 17" wheel, like 245/40/17, and used wheels are easy to find. once you start getting competitive, then you'll have to switch to 18" for better tire selection.

 

you need to speak "rulese" to understand some of this stuff