Slip Angle. Is it weak in some tires?

Hello, i been using BeamNG with my G25 lately and been experiencing something weird about the angle that i have to reach in my steering wheel (im using linear degrees, wich means that the virtual steering does same as my G25) to turn over around 100km/h (~60mp/h) in long corners specially were i have to hold my steering turning static to reach the end of turn.

I been thinking in a kind of toe out problem, but later tought on slip angle. Tried cars with low profile tires and that effect dissapear. Because of that i start looking at slip angle (for those who dont know it, is the angle betwen rim and contact path of the tyre. Ie if the rim turns 15º on the tyre tend to keep straght and bends, so contact path would be turning 11º ) and found relevant images wich im going to share.

Found few cars wich have specially weak tire wall that cause wich is in my opinion, way too much slip angle. Sunburst 1.8 FWD MT and Moonhawk V8 MT

Cars like: Covet Race and Bolide 350GT. Work very good. Others are in the middle like D15 L6 RWD, Have pics of that if u want too, just wont make this too big, 4 examples are enought.

Im going to present the pictures i took in slip angle increase order:


(imported from here)
(imported from here)


(imported from here)
(imported from here)

Hope u can see the slip angle variations. Imo stronger tire walls would give alot more spot on experience, but maybe some1 can give another opinion and have other theories!

 

Note that we're also still doing a lot of work on the suspension since introducing the new tire model - in some situations the existing suspension structure simply can't handle the (realistic) forces the new tires are capable of transferring. Our latest project is diagnosing the inconsistent relationship between steering wheel angle and turning radius, seen below:


(imported from here)

^this gif illustrates an inconsistent turning radius while maintaining a constant steering wheel angle, for 50km/h and then 25km/h. It currently affects most of the vehicles to some degree.

 

Is this work why the Hirochi Sunburst suspension for instance, is breaking so easily?

 

Tnx Goosah and B25Mitch for your fast reply.

I seen all work u do (as u can imagine i love tyre physics too) and its great, i dont want to sound like i think im very very smart and can teach u about tyres, i think u might not take this like this but would like to set it clear anyway

I would like to point again that i was not trying to reach the peak, i been driving 60mph and tyres did not slide skid or even start to on this testing. What i´ve notice is a big difference betwen great reaction and work of tirewall being pulled side to side on horizontal direction (would like to be able to express better myself on english, hope u can follow me) and twist capability of the tyre, represented by slip angle, wich was way to big. I think u got very good results on your test in terms of general behavior but i tought that maybe your dedication been limited by the beam designt of the tyre wall.

First i did a projection of the difference betwen rim and tyre direction:


(imported from here)

In that projection u can see what i see wrong. The green arrow follows the beam from the right, wich is the one taking the bigger part of grip and weight transfer on that particular situation. Purple is rim angle obviusly. If we think on a skiding tyre reaching peak would be possible, but at those speeds and steering angle i think it should be alot smaller gap betwen both projections.

So well, again, i think your job have been limited by beam design of tyre so i ll show what i think could be a kind of improvement, ofc have a cost in terms of optimization but obviusly wont make any damage, just could improve things.
This mid range round of beams have many purposes. The distance betwen nodes is smaller than tyre path, so smaller beams can push smaller amounts of twist focre to tire wall beams, beside´s that, having beams in cross patern, make the twist tendence of beams harder, disipating the force betwen more nodes. This mid range round can also give the opportunity to replicate tire wall shape, wich is fatter nearest to rim and thiner colser to path, represented with A and B on the draw, decreasing the twist or slip angle tendences of actual beam design of tyres.

No more talking, this is what i tought:


(imported from here)

To finish, you could think, if beam design of tyre was wrong, this guy say i had very good results on some aspects of tyre. Well, the distance betwen rim node and path node would be exatctly the same! no matter how many beams or nodes exist in the middle of them, and there wont be anything changing that dynamic aspect of the tyre, what´s been working bit different is that twisting capability caused by lack of resistance in beam terms.

Hope u could follow my thinking even with my limitation to talk about tyre physics in another language!

 

FUN_RJS.
Good to see, it is interested someone other that improve the tire physics.....
But if I can give you one piece of advice..... don't waste your time for this!
I tried something similar, but with less result!

gabester.
can you fix this until V .8
sunburst physics skeleton.
-Rally F/R wheel
-Race R wheel
-Sport F/R wheel
-Sport RS R wheel
-Sport S F/R wheel

THX.