Tire Model? Physics? | Please Kunos, I Want Assetto Corsa Evo to be the Best Sim Ever!

[@emikuruma]

Clarification! Understeer wise, I have no problem with it. Dancing near the limit is pretty close to irl. But when we start playing a little bit more above the limit, when we get to a certain drift/oversteer angle, the rear starts to feel like ice and it's almost impossible to save. When I said "certain angle" in 14:39, I meant drift angle and NOT steering angle. Sorry for the confusion! I'm still learning this whole explaining on video bit. I kinda see where the misunderstanding could come from when I rewatched the video! The Tire model is probably the same for the front tires and the rear tires. But the rear does feel like it falls off the more slip angle it has. To be specific, at a certain oversteer angle, I'm used to adding maintenance throttle or part throttle to stabilize the rear. But in AC Evo all it does is slide more, instead of shifting weight to the back and producing "forward bite". Feelings wise, that's how I'd describe it. I have no idea though from a programing perspective why/how this is.

[@santalfredos17]

that's intresting. Actually, we spent hours and hours with the tyre model and the graph that you're plotting is the same graph that we have :D The "problem" of the "ice" is coming from the front, since these cars have not so much steering and road setups are made for being understeery by default. We'll keep working on it 😁

[@emikuruma]

@@santalfredos17 Are you from Kunos? :O. That would be amazing!!! Yeah the graph I drew is what I felt like the rear traction is. When I force understeer, the fronts feel like it has the proper slip angle model. Even at full lock understeer at the top of second gear, the fronts still have some grip so that's good! Though my "ice" issue isn't from the understeering, it's the rear no longer responding after a certain drift angle, making saving a slide to feel awkward. The road cars and setup feel good btw! I deal more with OEM testing and road cars more versus outright race cars on slicks. The way I work around understeer in street cars are very similar to how I do it in ACEvo too so that's good! At most the racecars I drive now are on AD09 and RT660s. For the most part the street cars feel great up to a certain level above the grip limit. It's just that after a certain level past the grip limit, a spin becomes unavoidable.

[@PeWersi]

Hello Emi, thank you for this nice and very interesting video! Please keep us updated about Evo.

[@emikuruma]

l'll do one again when they update the physics :D

[@markoraic1156]

Hi ! I just wanted to say how I really appreciate the time and effort you put into your feedback on this game, especially with your detailed critique of the tire physics and the slip angle graphs you provided. It’s clear you’re drawing from your real-life experience, and your constructive and professional approach makes your video not only informative but also engaging to watch. I’ve done a little digging myself into the topic of tire models in racing games, and it seems like a bit of a “black art.” From what I’ve read, getting them right is extremely challenging (no game has done it completely right), partly due to the sparse data available and the complexity of simulating tire behavior. On top of that, even today’s technology might still be limited by the sheer computational power required to make these models fully realistic. I really like you detailed approach. Cheers !

[@emikuruma]

Thank you! Yeah tires are so difficult to model and predict haha. It's like a balloon with a bajillion parameters. We do have a lot more computational power today, but I won't be surprised if that's still not enough!

[@zagg5154]

great vid i just wanna say that youre one of the the few because 90% of people are gonna disagree with you even if youre right and clearly explain your stance. sim racers have some weird form of stockholm syndrome 🤣 also they really struck gold with the ffb in ac1 its almost criminal how well you can drive a car on the limit in a 10 year old sim. hopefully by the time they get to the drift cars theyll figure it out because its gonna be very clear at that point.

[@emikuruma]

Yeah! I'm gonna make a video about "things you need to know when jumping from sim to irl." Like I'm already ok with a T300 because the irl race cars you'll probably get to drive will have worse steering feel than a T300 hahaha.

[@Kiwi_Waffle]

Thanks for the information, appreciate for you time and effort to made you video💙. I only drive FWD car so far never try other yet QwQ, really nice you able to drive lot car. Also just give idea maybe made video part by part so its doesn't fill to long. that's all love you 💙💙💙 ,

[@emikuruma]

It was supposed to be a 8 min video. But it got away from me haha. More bite sized content soon! Also yeah, we cannot escape the FWD. Up to today, FWD is majority of what I drive too.

[@undercoft7756]

As someone who enjoys sim racing (although I have little experience / skill) I do feel similarly. Specifically on AC I have been running an AW11 on Nagao, and have a suspension setup to where it will understeer on throttle, even in a pretty hefty spin. Hopping onto ACE and driving the ND on leguna seca, I definitely felt the car rotate alot, but as you were explaining the car felt near impossible to save from a spin. I remember trying more steering lock, which worked, but I was also playing alot with the throttle, because it felt best to get weight off the fronts and stop the rotation. While I am not a great driver, I could definitely feel it was easier to save in AC than ACE from a spin, even with my likely poor throttle control. I don't know if your slip angle theory is correct, but it seems like a likely reason in my mind. I'll stop yapping now, but this is great video about ACE and car physics in general, great work!

[@emikuruma]

Thank you! Yeah AC I was a bit easier to handle definitely!

[@Simiesper]

love your video. I felt the same about this sim.

[@emikuruma]

@@Simiesper thank you! I'm glad to see I'm not alone with this opinion!

[@finnvanilla]

Very good info i loved it

[@emikuruma]

Thank you!

[@felipetartas5434]

All I know I lost my rear end more times in the few hours of AC EVO in corners like South Bank in Brands Hatch than in my 2000 hours of AC1.

[@emikuruma]

Me too! AC1 feels more natural to drive!

[@caminatimichele]

Is that why the only way I found to maintain a long drift at a certain angle is to apply left foot braking at the same time?

[@emikuruma]

I am not sure if the left foot braking will help, but left foot braking simulates having an AWD deceleration locking LSD. So it might help stabilize things.

[@podio_km4g532]

any reference to iracism in the middle of the video are purely random

[@finnvanilla]

de donde sos?

[@emikuruma]

I am from South East Asia

[@finnvanilla]

@emikuruma2902 Philippines? The chau/ciao tickled my brain

[@emikuruma]

@@finnvanilla should I make that my signature outro? 😂

[@finnvanilla]

@@emikuruma yes, if you want to mislead your audience in argentina we say chauchas(green beans) and in latam chaito((cha-ito)diminutive of chau) also sounds kinda asian

[@emikuruma]

@ Green beans outro! Hahahaha

[@SGNailz]

you are totally onto something with the drop off in the tire model

[@emikuruma]

At some point, at a certain drift angle, the tires just feel like ice and it bothers me ahuhu

[@SGNailz]

@@emikuruma I thought it was diff/drive just losing its shit at a certain point. Idk hoping they fix it.

[@RustyRussell_YT]

Totally agree with you on slip angle, going and controlling over the limit stuff. AC1 had that already perfected, no other sim came even close. Why throw that away?🥲 By the way, good luck with your great channel! Subscribed🤓

[@emikuruma]

@@RustyRussell_YT Thank you! I'll be dumping my whole knowledge on this channel. More content soon! I have not driven AC1 vanilla in a long time. I should go back and confirm haha