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NASA Tire Rule Change

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Old 11-28-2011, 07:31 PM
  #21  
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Originally Posted by 03threefiftyz View Post
Errr...actually they may be TTA. Since the top running 350's in SCCA are all HR's now. 285 A6's, remote shocks, springs, sways, T2 weight is well under the 33-- that NASA has listed, diff, test-pipes + Exhaust, etc....
If I ran 285's, I would have to add 7 points based on the NASA system. Remote shocks are a lot of points too. I think it would be at the bottom to middle of TTA especially if they are HR's. I have an '04 base.
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Old 11-28-2011, 08:52 PM
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Originally Posted by Fixxxercask View Post
If I ran 285's, I would have to add 7 points based on the NASA system. Remote shocks are a lot of points too. I think it would be at the bottom to middle of TTA especially if they are HR's. I have an '04 base.
I realize its apples to oranges, my point is that T2/T3 car would at least be able to take part in a a NASA event (PT or TT) due to the flexibility of the classification system (more inclusive, less exclusive).

But for the sake of it, assuming a dyno reclass to TTC of 265whp/3190lbs (no points for engine/hp mods required), wouldn't any of these configs be reasonably competitive at a NASA event (or at least as competitive as they are in T2/T3 vs Mustang/Evo/[insert whatever overdog SCCA decides to include in future here]):


TTC (T2 350Z w/o Aero, yes the aero is throw away but must take points)
+13 Hoosier A6
+ 7 Tire width (285mm)
+10 Shocks - Triple Adjustable w/ Remote Reservoir
+ 2 Springs
+ 2 Calipers
+ 1 Modify Diff
+ 2 Sways

Total: +37 up one class to TTB







TTC (T2 350Z w/ Aero)
+10 Hoosier R6, BFG R1, Goodyear Eagle RS, Hankook Z214 (C71, C70, C51, C50), Hoosier R6, Kumho V710
+ 7 Tire width (285mm)
+10 Triple Adjustable w/ Remote Reservoir
+ 2 Springs
+ 2 Calipers
+ 1 Modify/Upgrade Diff
+ 4 Rear Wing
+ 3 Front Splitter

Total: +39 up one class to TTB






TTC (T2 350Z w/o Aero)
+13 Hoosier A6
+ 4 Tire width (275mm)
+10 Shocks - Triple Adjustable w/ Remote Reservoir
+ 2 Springs
+ 2 Calipers
+ 1 Modify Diff
+ 4 Rear Wing
+ 3 Front Splitter

Total: +39 up one class to TTB

Last edited by l30thelion; 11-28-2011 at 09:26 PM.
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Old 11-28-2011, 11:36 PM
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I feel ya. If I were to try to fit into any of the "T" classes, I would be screwed, but if you came over, it would be a lot easier.

All of those options would work just so long you were not taking any points for weight. Here are the base classes and weights for the different models of Z's.

Nissan 350Z (287hp)('03-'05)(enth.ok) TTC 3188lbs(This is where my car lands)
Nissan 350Z (300hp)('06)(enth. ok) TTC 3339lbs
Nissan 350Z (306hp)('07-'08)(enth. ok) TTC* 3320lbs
Nissan 350Z Nismo ('07-'08) TTB 3350lbs
Nissan 350Z Track ('05-'06),35ann, GT TTC* 3370lbs
Nissan 350Z Track Model ('03-'04) TTC* 3225lbs

What is your comp weight and max power/weight?
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Old 11-29-2011, 06:28 AM
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Originally Posted by Fixxxercask View Post
I feel ya. If I were to try to fit into any of the "T" classes, I would be screwed, but if you came over, it would be a lot easier.

All of those options would work just so long you were not taking any points for weight. Here are the base classes and weights for the different models of Z's.

Nissan 350Z (287hp)('03-'05)(enth.ok) TTC 3188lbs(This is where my car lands)
Nissan 350Z (300hp)('06)(enth. ok) TTC 3339lbs
Nissan 350Z (306hp)('07-'08)(enth. ok) TTC* 3320lbs
Nissan 350Z Nismo ('07-'08) TTB 3350lbs
Nissan 350Z Track ('05-'06),35ann, GT TTC* 3370lbs
Nissan 350Z Track Model ('03-'04) TTC* 3225lbs

What is your comp weight and max power/weight?
I only run TT, no W2W for me at this point.
My Z has no engine/hp upgrades, I run various configs:

TTD dyno reclass @ 3370lbs/235hp:
+13 A6
- 4 225mm Tire
+ 2 Springs
+ 3 Shocks (DA Koni)
+ 2 Sways
+ 2 Calipers
+ 1 Upgrade Diff

Total: +19 TTD

I think the following would work very well for TTD. Min Wt/Hp ratio for TTD is 14.00, so w/ this config it would be 3195/235 = 13.59 + .8 (for tire < 255mm) - .05 for weight = 14.34....pretty close to min.
TTD* dyno reclass @ 3195lbs/235hp:
+ 7 for the (*)
+10 R6
- 4 225mm Tire
+ 2 Springs
+ 3 Shocks (DA Koni)
+ 1 Upgrade Diff

Total: +19 TTD



Regarding the tire rule change, I sold my 17x10 wheels and was hoping to eventually buy 18x10s to take advantage of the 255 tire. I wish I had kept my 17x10s, it was a joy running 275 R6s on em. Right now I'm running 225 R6/A6 on 17x8s and its not too bad. I'm hoping I can make it out to Nats in 2012 (though its a long shot). I would like to run TTD or TTC, I think the Z has a chance in one of those classes, what do you think?

Last edited by l30thelion; 11-29-2011 at 06:36 AM.
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Old 11-29-2011, 07:24 AM
  #25  
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I never thought of doing TTD. That would be an excellent setup for that class because you would be at the top of the power/weight big time with that adjustment. TTC, you would have a hell of time in because it is dominated by S2000's. They are much lighter and are at the top of the power/weight. There was an S2000 in TTC at Nats that ran faster than half of the TTB class. He is local to my region and he is something else.
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Old 11-29-2011, 06:35 PM
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wow I can't imagine running 225's.....but maybe the actual section width is more like a 255 at least?
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Old 11-29-2011, 07:49 PM
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Originally Posted by Fixxxercask View Post
I never thought of doing TTD. That would be an excellent setup for that class because you would be at the top of the power/weight big time with that adjustment. TTC, you would have a hell of time in because it is dominated by S2000's. They are much lighter and are at the top of the power/weight. There was an S2000 in TTC at Nats that ran faster than half of the TTB class. He is local to my region and he is something else.
There are two E36's (Scott Blair and DJ Fitzpatrick) that really really move in TTC. Both hover around the 2:10 range at VIR Full, which is FAST, for relatively lightly modded E36 M3 on hoos.

Originally Posted by AznSky View Post
wow I can't imagine running 225's.....but maybe the actual section width is more like a 255 at least?
The width is wide for a 225, but not quite the size of most of the summer tire version of 255's. The two M3's I mentioned above run on 225's (last I saw), and probably weigh more than what a TTB 350 can or could weigh. You just have to make the first few laps count on A's at that size I would think. The load on the tire at that size is probably at or beyond what hoosier intended as well.
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Old 11-29-2011, 08:34 PM
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Originally Posted by 03threefiftyz View Post
There are two E36's (Scott Blair and DJ Fitzpatrick) that really really move in TTC. Both hover around the 2:10 range at VIR Full, which is FAST, for relatively lightly modded E36 M3 on hoos.



The width is wide for a 225, but not quite the size of most of the summer tire version of 255's. The two M3's I mentioned above run on 225's (last I saw), and probably weigh more than what a TTB 350 can or could weigh. You just have to make the first few laps count on A's at that size I would think. The load on the tire at that size is probably at or beyond what hoosier intended as well.
Yeah, the 225 Hoosiers are more like a 245. I ran the 225 A6s in TTD @ 3370lbs/235hp! They held up fine.

I sound like a broken record: The NASA TT/PT classification system is great, the flexibility in the system allows for "creative" configs, its up to you to find what strategy works best and that is part of the fun. It also allows for some interesting fields of cars, for example TTD that weekend was made up of 2 supercharged 93 miatas, a 97 mustang cobra, a 350Z, a 99 miata, 94 bmw 325is, and a 98 bmw 328i...now that is fun!
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Old 11-29-2011, 08:47 PM
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Originally Posted by 03threefiftyz View Post
There are two E36's (Scott Blair and DJ Fitzpatrick) that really really move in TTC. Both hover around the 2:10 range at VIR Full, which is FAST, for relatively lightly modded E36 M3 on hoos.



The width is wide for a 225, but not quite the size of most of the summer tire version of 255's. The two M3's I mentioned above run on 225's (last I saw), and probably weigh more than what a TTB 350 can or could weigh. You just have to make the first few laps count on A's at that size I would think. The load on the tire at that size is probably at or beyond what hoosier intended as well.
DJ tore it up at Nationals. I think his car was much lighter than my 350 though. Although I was taking no points in weight. This year I will run TTB again and be closer to 3050lbs and I was around 3210 before.
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Old 12-19-2011, 07:41 AM
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I think I made a mistake and ordered 245/35 to try out next season. I ran the 255/35 before and the Z did excellent on them. I am thinking now the 245/40 is the best choice. Oh well, we'll see!
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Old 12-19-2011, 08:59 AM
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Originally Posted by Fixxxercask View Post
DJ tore it up at Nationals. I think his car was much lighter than my 350 though. Although I was taking no points in weight. This year I will run TTB again and be closer to 3050lbs and I was around 3210 before.
Last I heard his car was right around 3000lbs w/o driver. D.J isn't a big guy...so figure 3160-3175 w/driver. Don't know how much or if any ballast he was using at Nationals, though.
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Old 12-19-2011, 11:04 AM
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Originally Posted by ThreeFiveZero Z View Post
I think I made a mistake and ordered 245/35 to try out next season. I ran the 255/35 before and the Z did excellent on them. I am thinking now the 245/40 is the best choice. Oh well, we'll see!
Let me know what you think. I went ahead and ordered 275's for next year. If I run 245's I can lose another 75lbs of weight. Not sure which would be better.
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Old 12-19-2011, 11:34 AM
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Originally Posted by Fixxxercask View Post
Let me know what you think. I went ahead and ordered 275's for next year. If I run 245's I can lose another 75lbs of weight. Not sure which would be better.
Will do...I hope to see a few Z cars on the podium at Nats next year
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Old 12-19-2011, 11:49 AM
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Me too. My car will be lighter and have more power. I a still improving as a driver too. Never slowed up at Mid Ohio yet.
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Old 12-25-2011, 06:46 PM
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Have any of you guys seen the 2012 TT/PT rules yet? Last year they had them released by now. I am really wanting to know soon, so I can proceed with some work on the car. I know some of you guys in the south are probably needing them more than me because you guys actually have events in Jan and Feb.
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Old 01-02-2012, 03:15 PM
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2012 PT/TT rules are finally out.
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Old 01-02-2012, 03:20 PM
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Link?
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Old 01-02-2012, 03:40 PM
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Old 01-22-2012, 05:24 PM
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Check out this 2013 rule change thread that's already starting. It's going to be 100 pages by summer.

http://www.nasaforums.com/viewtopic.php?f=2&t=52825
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Old 01-22-2012, 07:04 PM
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Originally Posted by Fixxxercask View Post
Check out this 2013 rule change thread that's already starting. It's going to be 100 pages by summer.

http://www.nasaforums.com/viewtopic.php?f=2&t=52825
FYI, I'm being told by my TT Director and G.G that I have to take +6 for the cusco camber arms if I want to run them on my 350Z.
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