Car mechanics & dynamics document

Yeah well, the dude made it seem so groundbreaking lol

Link?

EDIT: aaaaand the link appeared :derp:
EDIT2: or was edited in.

So you suffer from premature posting?

Outstanding job!

The 811 is just generally fast, even stock. It could just so happen that it's overly sensitive to little bumps in conjuction with AWD makes it so fast. But there is definitly something about it in stock form that makes it otherworldly fast, so it seems to me like it's intended, to some degree, to be really fast.

This turning-left-to-slide issue is mysterious though. As adam10603 mentioned 2 pages back, I believe, even cars with good suspension stats slide out. I thought maybe high anti-roll force does it, but there's a huge difference in the group of affected cars so that's not it.

Wheel size difference was suggested, but the Pigalle has the same size for all wheels if I'm not mistaking so that's not it either. It might increase sensitivity to sliding, but that's not the primary cause. Also the Pigalle is front wheel drive so it shouldnt be able to spin out at full throttle unless you zig-zag wildly.

Suspenion front/rear bias isnt the reason either as the Infernus Classic is even setup to have better rear suspension than front. So if anything we'd expect the front wheels to cause issues first, but that's not the case. In contrast the Vigero and Gauntlet are very close to 50/50 so this isnt it.

Roll centre vs Centre of Mass varies between the cars but is, as with everything else so far, inconsistent. I will refer to this like (roll height/CoM) in the following examples. Comet Retro low/low, Gauntlet med/med, Dominator (if AbeCede is correct, I havent checked personally) is low/high, Vigero med/high, Pigalle low/med. So we're seeing all sorts of configurations here. The reason you're not seeing any high/low configurations is because only 2 cars in the entire game have that currently (Tyrus and X80) but both also have tyre clipping so they probably wont show any issues anyway.
EDIT: Both Dominators have been tested and they're fine. They slide what looks like equal amounts both ways. adam10603 also tried easing onto the steering limit to see if it would still slide, but it remained stable both ways.

Traction front/rear bias is also inconsistent as the vast majority of the game's cars are setup to have just a little more rear grip, favoring understeer. It's rare to find any car that's 50/50, as the average across the board is somewhere around 0.48 - 0.47 "front bias", meaning a lower value = understeer. So sliding would have to be provoked by something more than casually steering a little to one side.

I'll also mention Centre of Mass for the sake of completeness. Most cars have their CoM quite nicely centered in the wheelbase, so there's barely any bias towards understeer or oversteer for most cars. What might happen is that a rear-heavy car will want to spin around faster than a neutral or front-heavy car, but the car still needs an initial loss/breach of traction to get sliding. Again most of the affected cars fall in the category of being mostly neutral, so all this does is maybe exaggerating the problem a little.

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Looking at this from a game coding perspective, and this is "educated speculation" if you will, I'm suspecting that the issue lies in the order the wheels are updated. Looking at the vehicle rigs the front left wheel is presumably simulated first, because it holds the visual model to later be copied around. Remaining front wheels after that. Then rear left, because it holds the model for the rear wheels if the rear set is different. That leaves us with the right rear wheel being processed last in the case of 4-wheeled cars. So what could be happening here is that whatever is affeced by the update sequence has been changed and for some reason the last wheel, right rear in this case, gets the wrong treatment.

What causes specific cars to freak out this badly is... a mystery even with this knowledge, to be honest. I wish the best of luck to the developers to figure this one out. *nopes out of this one*

On a side note about the 811 - I destroyed a top speed challenge in a 811 last night, I hit 140.x mph but that was owing to heading downhill and soaking up some bumps.

I wonder how gUNIT was able to race in the Infernus Classic.
www.youtube.com/watch?v=lswPmGaW14Q

Is he SUCH an awesome driver? The bug is on PS4 too, right?