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Do someone tried it? Any comment?

Just tried it and i can tell you right now without a shadow of a doubt this is the best thing ever to happen to sim racing, the car feels so connected too the track you can feel the tyres sliding across the track when the car starts to understeer back up the hill.
 
Just completed a 40 lap run @ Michigan with it and during the run i tried different lines really pushing the front tyres then backing off for a lap to let them cool down and there back again over the run you had varying grip levels depending on how hard you pushed either the front or rear of the car and the best thing of all for any oval fan in iRacing is that you actually have to turn LEFT, really is fantastic.

Sounds like what people said when they released the game in the beginning? hahaha all that money down the drain all these years just to be able to actually get the cake now…

is awesome….

huge step forward for iracing. I only needed to do two corners at Road America to feel the difference, the car is much more connected and it’s not trying to go away any time you put your foot down. On ovals it shines even more as the driving is now a lot smoother.

The new tyre model is awesome, it really is. I wasn’t expecting it to feel so obviously better than the old tyre model – which I thought was good – but this is a big, big step up. The car feels planted rather than skating on ice. Over driving is punished. The excellent FFB has got even better. It just feels right. It feels closer to driving a real car. I’m really looking forward to getting to try this with the road cars over the summer…

As a iracing roadracer i think i buy the nationwide just to try it out.
Looking at the awesome comments.

e here. I’m going to buy it this weekend.

Guys… and girls… this is top noch…. I took the Impala for a drive on atkins Glen ith the road america setup in order to not have the Failed Tech

Believe me.. I wasn’t optimistic… but… this is soooo much better, so much more alive… I’m hooked…. and can’t wait for the implementation on the reste of the road cars…

iRacing…. You’ve done someting very worthwhile here!

Thanks

Look at the lag between the ingame wheel and the real wheel. Are people ever going to learn to disable VSync in sims?!

No, it seems people never ever learn that vsync is the plague.

A few questions on the NTM…

1. How does it handle on the grass?

2. How does it handle at low speeds? (is there a change around below the pit entrance speed? Below 30kmh?) Is the classic pacejka low speed issue ( tire forces diverge at 0 speed, and computationally explode at low speeds, so an arcade model is used below ~70km/h ) definitively archived?

3. What are the differences with nkPro?

4. DK said they now need fewer real numbers to reproduce a tire, and that all of those can be obtained more easily without tire testing machines. Are these tire input data enough to reproduce effects like the peculiar degradation of this year Pirelli F1 tires (they perform well and with linear degradation for only a few laps, then degradation gets exponential), and differentiate them from last year “more normal” F1 tires?

5. Some numbers from the top drivers: what are their laptimes now? In hot lap, during a race and compared with real life times. Has the gap with slower drivers been reduced and how much.

Check out this great comparison video at Road America

I haven’t driven it yet, but from what I hear:
1) Far better grip on the grass.
2) Much better, though there is still a bit of a shake in the FFB to be worked out.
3) The iRacing NTM has more temperature sensitivity, but doesn’t have flat spotting and dirt buildup implemented yet. The NTM is capable of flat spots, dirt, and even missed lugnuts, they just haven’t been implemented yet.
4) Dunno.
5) Probably need to let everyone adjust before things really shake out, I heard most races have a ton of spins while people learn. My buddy who races late models and street stocks says it feels like a race car now, where previously it didn’t.

I’ve now driven it at Road America and NHMS. Good grip on grass, you can drop tires without the old instant spin, and if you keep it gentle you can rejoin well from off tracks. Also the low-speed behavior is MUCH better, the car feels planted below the limit, is relatively predictable reaching the limit, and difficult to recover from over the limit. Lockups will force you to run wide, as the extra tire temp reduces your ability to brake even after tie tire is rolling again. Also, apparently all the baseline setups are real-world setups, and they drive great.

Also, one of the devs basically confirmed that tire compound is modeled. The NASCAR compound is designed to be at peak grip at ambient temps, it loses grip as it heats up, unlike most other compounds.

Also, fast laptimes at Road America are around 2:10-2:16, a bit faster than the NW times last year, but we have more practice and fewer consequences. Seems about on par to me, I doubt the NW drivers push as hard as we do in the sim, especially for the first time on the track last year.

Also, from my brief experience in NKP, it feels pretty similar. Of course, the difference between being a 3000lb stock car and an open wheel trainer makes it difficult to do a decent comparison.

iRacing WC drivers ares starting to run on 2:08.x, and on youtube there is a 2:09.5xx video. Real life pole last year was 2:16, this year (today) pole was 2:13.2xx (Jacques Villeneuve came in third with a 2:14.3xx). So the difference is between 3-5%, which seems what we had with the old pacejka tire model. But the time difference is not a measure of how realistically the car behaves. It is possible to have a tires+car model that drives nothing like the real thing (like the old pacejka for most cars) but has very close laptimes. The NTM models simlulate things that have never been in a consumer simulator, it remains to fine-tune it.

Great that they somewhat model the temperature-grip relationship of the rubber mixture. I wonder if they also had some base to somewhat model wear properties (tire manifacturers usually do not disclose their data). Also, that the real world setups are starting to correlate with the NTM (they never did before) is great news!

Yeah, the laptimes are faster still, I’m thinking that’s about 30% due to fine-tuning the tire model, 30% due to our equipment being in pristine condition every time we take it on track, and 40% due to not having the fear factor (and if you saw the Grand-Am wreck yesterday at Road America, I can bet the NW guys all took it a bit easy into T1…)

I know two of the issues known by iRacing staff are that the tires fall off more quickly than they should (plateau in grip after 5 laps, should be closer to 15) and the transition from lateral slip to grip is a bit off. But I said elsewhere, even the worst of the current issues in the new tire model are better than the best the old tire model was capable of. After a year of additional development, I think it’s going to be spot-on.