Nasa TT/TD disccussions

[Takumi788]

Originally Posted by zdr93523

Time to go back to NA

I was wondering how anyone with this platform was happy about TT4. You must all be boosted!

I am looking to get into TTD for 2017 with a dyno re-class. Anyone want to share any TT tips or tricks for a newbie?

[ja1217]

Originally Posted by Takumi788

I was wondering how anyone with this platform was happy about TT4. You must all be boosted!

I'm not boosted but my car has been putting in some seriously competitive lap times in TTB even though I'm nowhere near the power to weight limit for the class. I make around 205whp on E85 and my weight is around 2775, so thats a ratio of about 13.5 when the class limit is 10.5. I know that TTB isn't the most competitive group in my region, but I haven't lost an event yet (at least not when I'm running Hoosiers) and I've been multiple seconds ahead of the GTS-2 qualifying times, which I know is a pretty competitive group in my region. And all this has been on relatively skinny 225 Hoosier R7s.

I think I also have a pretty good shot at setting some TTB track records at Summit Point, NJMP Thunderbolt, and VIR now that the temperature has finally started dropping for the fall. Well, maybe not VIR. I'm not sure I've got the straight line speed for that one.

I am looking to get into TTD for 2017 with a dyno re-class. Anyone want to share any TT tips or tricks for a newbie?

Get rid of the spoiler. Easy 4 points back in your pocket for things that are actually functional.

[Takumi788]

Originally Posted by ja1217

I know that TTB isn't the most competitive group in my region, but I haven't lost an event yet (at least not when I'm running Hoosiers) and I've been multiple seconds ahead of the GTS-2 qualifying times, which I know is a pretty competitive group in my region. And all this has been on relatively skinny 225 Hoosier R7s.

I think I also have a pretty good shot at setting some TTB track records at Summit Point, NJMP Thunderbolt, and VIR now that the temperature has finally started dropping for the fall. Well, maybe not VIR. I'm not sure I've got the straight line speed for that one.

Good to know the twins are competitive in TT. There are less than a handful in my region and I don't think they are front runners.

Get rid of the spoiler. Easy 4 points back in your pocket for things that are actually functional.

Already removed the spoiler for that reason. It was a bad decision to order it from the factory anyway. I hated it.

My plan is:
2775 w/ 195whp - stage 2 93 octane oft tuned
full exhaust
225 slicks of some sort - kinda thinking maxxis rc-1
RCE tarmac 2 coil overs
Solid bushings
4.67 final drive - are there points for this!?

If I have any points left
Front splitter
Gt wing


Can the twins have a proper race alignment without toe arms!? They are +4 points and to my knowledge are needed on a lowered properly aligned twin.

[Pat]

For what it's worth, Takumi788, I don't compete in TT. I run in group 4 so I can be covered by insurance. But my times now would put my in second place in TTD. My only mods are DTC-60s, brake ducts, camber plates and sticky tires. I still have plenty of points left to spend. If I were to upgrade my suspension to something like Tarmac 2s, I expect I would win TTD most weekends. Every region is different, of course, but at least in the Rocky Mountain region that's how it works out.

[Takumi788]

Originally Posted by Pat

For what it's worth, Takumi788, I don't compete in TT. I run in group 4 so I can be covered by insurance.

I am currently in run group 3. I was going to dial in the car in 2017 DE events then move to TT mid way through the year. This way I can compare lap times to TT for the first part of the year to see if I will be competitive.3

I don't really care about insurance. When I am at a DE event of course I carry it but the only reason the car is on the road at all is because I currently don't have a truck and trailer. The miles I put on my car are miles to the track, on the track then back to my shop.

I have been on and off the TT wagon a few times. We will see how it goes.

[ka-t_240]

Originally Posted by ja1217

I'm not boosted but my car has been putting in some seriously competitive lap times in TTB even though I'm nowhere near the power to weight limit for the class. I make around 205whp on E85 and my weight is around 2775, so thats a ratio of about 13.5 when the class limit is 10.5. I know that TTB isn't the most competitive group in my region, but I haven't lost an event yet (at least not when I'm running Hoosiers) and I've been multiple seconds ahead of the GTS-2 qualifying times, which I know is a pretty competitive group in my region. And all this has been on relatively skinny 225 Hoosier R7s.

I think I also have a pretty good shot at setting some TTB track records at Summit Point, NJMP Thunderbolt, and VIR now that the temperature has finally started dropping for the fall. Well, maybe not VIR. I'm not sure I've got the straight line speed for that one.


Get rid of the spoiler. Easy 4 points back in your pocket for things that are actually functional.

How are you in TTB while being NA?

Is TTB really that weak out there? At some tracks around here I am 5-6 seconds off average TTB times. Can't catch the S2k's.

[ja1217]

Originally Posted by ka-t_240

How are you in TTB while being NA?

Is TTB really that weak out there? At some tracks around here I am 5-6 seconds off average TTB times. Can't catch the S2k's.

TTB isn't all that strong in my region right now, but I was under 2 seconds away from the track record (which was set by a GTS-2 car) on what was one of the hottest and most humid days of the year at Summit Point. From past experience I know that I can pick up at least 2 seconds when track conditions are ideal (think a cool, but sunny October/November morning). At VIR I set my best time ever in the first morning session and the proceeded to be nearly 3 seconds slower in my next session around noon with no change to the car.

S2K's haven't been a problem for me. Again, my best time (in the June heat) at Summit Point was just about 0.5 seconds off of Rob Robinette's best time that he set in November, who from what I understand is rather famous in the S2K community (https://robrobinette.com/S2000SummitPointLap.htm). Also, according to his data, I am over 10mph down on speed on the front straight, my car just makes up the time in the corners and braking zones.

As for how my car got so fast, I think it comes down to having a decent aero setup, good suspension setup, and I'm sure having a proper race seat and all the chassis stiffening that comes from a roll cage really helps give me a good feel for the car.

[ame="https://www.youtube.com/watch?v=-3bgjROT8wQ"]Fastest Lap @ Summit Point Main - 1:22.292 - YouTube[/ame]

[ja1217]

Originally Posted by Takumi788

Good to know the twins are competitive in TT. There are less than a handful in my region and I don't think they are front runners.



Already removed the spoiler for that reason. It was a bad decision to order it from the factory anyway. I hated it.

My plan is:
2775 w/ 195whp - stage 2 93 octane oft tuned
full exhaust
225 slicks of some sort - kinda thinking maxxis rc-1
RCE tarmac 2 coil overs
Solid bushings
4.67 final drive - are there points for this!?

If I have any points left
Front splitter
Gt wing


Can the twins have a proper race alignment without toe arms!? They are +4 points and to my knowledge are needed on a lowered properly aligned twin.

You are going to need to weigh more than 2775 for sure. I submitted my car for a dyno reclass of 194whp and was told by Greg (national director of TT) that my minimum competition weight would have to be 3040lbs. I decided to stick with a points build instead and just take the +5 for exhaust modification.

Other than that, if you can run E85 as it is a no points mod and picks up an easy 10-15whp.

For tires, the Maxxis are nice (I ran on them all last year) and have a very generous contingency, but they are no Hoosier. My data has them being around 2 seconds slower a lap all else being equal on a 1:25 lap.


The final drive change does not cost any points and I have been happy with the 4.55 that I put in my car for this year.

If I were you I wouldn't worry about aero in TTD. I think that the following is pretty much the optimal build for TTD:

225 Hoosier R7's - 6 pts
Full exhaust incl. header - 5 pts
Suspension (your RCE tarmac 2's should be fine) - 5 pts
AP Racing Sprint BBK - 2 pts
Cusco or OS Giken LSD - 1 pt
All the free point mods you can throw at it (bushings, E85, final drive, etc).

This puts you right at 19 pts and should be a very competitive car.

[forwallblakmail]

Originally Posted by ja1217

You are going to need to weigh more than 2775 for sure. I submitted my car for a dyno reclass of 194whp and was told by Greg (national director of TT) that my minimum competition weight would have to be 3040lbs. I decided to stick with a points build instead and just take the +5 for exhaust modification.

Other than that, if you can run E85 as it is a no points mod and picks up an easy 10-15whp.

For tires, the Maxxis are nice (I ran on them all last year) and have a very generous contingency, but they are no Hoosier. My data has them being around 2 seconds slower a lap all else being equal on a 1:25 lap.


The final drive change does not cost any points and I have been happy with the 4.55 that I put in my car for this year.

If I were you I wouldn't worry about aero in TTD. I think that the following is pretty much the optimal build for TTD:

225 Hoosier R7's - 6 pts
Full exhaust incl. header - 5 pts
Suspension (your RCE tarmac 2's should be fine) - 5 pts
AP Racing Sprint BBK - 2 pts
Cusco or OS Giken LSD - 1 pt
All the free point mods you can throw at it (bushings, E85, final drive, etc).

This puts you right at 19 pts and should be a very competitive car.

I have to run aftermaket endlinks (2pts) otherwise the stock endlinks hit the control arms. Are you guys dealing with this too?

I'm looking forward to hitting dominion again with my brand new R7's. 1:37's on AD08R's (enough to win TTD Saturday and 2nd Sunday).

[ja1217]

Originally Posted by forwallblakmail

I have to run aftermaket endlinks (2pts) otherwise the stock endlinks hit the control arms. Are you guys dealing with this too?

I'm looking forward to hitting dominion again with my brand new R7's. 1:37's on AD08R's (enough to win TTD Saturday and 2nd Sunday).

I did not have any issues running my stock endlinks when I was in TTD. I wonder if its something to do with your setup or how low you are running your car.

[zdr93523]

The Maxxis are an awesome tire with a great contingency program. I think I won 16 tires last year. I use the DTC-60s as well and really like them, especially using a $150 1st place contingency certificate. I did try the 70s last year and did not like them. The 60s are much smoother and easier to modulate while having equal braking power. If you take advantage of the NASA contingencies, you can cut costs and support the companies and support our racing organization.

BRZs are awesome in TTD, really good in TTC with a true slick or A7, and can even compete in TTB on really sticky tires like a Pirelli DH slick or an A7. Tires >>>>>> any other mod including boost.

I'm excited for the new average power to weight rules. I'll get to lose about 150 lbs and stay in ST2 / TT2 while I think some of the Corvette's and high torque cars are going to get kicked to ST1 / TT1.

[Pat]

Great info, zdr. Thanks. I was considering trying out the 70s, but glad I just went with another set of the 60s now.

[enivid]

Originally Posted by zdr93523

The Maxxis are an awesome tire with a great contingency program.

Correction. The Maxxis are a slow tire with a great contingency program. The only way the contingency program works is if all the other competitors agree to run Maxxis or else you won't even get 3rd place to win anything.


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[Iwannajag]

We are running Maxxis RC1 in Spec86 (which is PTD/TTD). I run the 255's. Because of the size penalty, I can run 225 Hoosiers R7, which are more like 245 for less points (+10-4) than the Maxxis (+6+1).


We are dyno reclassed at 2850lbs with 180whp.


The 86 base PTD weight is 2935 and with the new PW ratio of 15:1 for TTD for 2017, I would expect the base weight to go up even more.