Why are the SBR, Sport RS Sunburst, and K-Series so awful to drive?

Recently, I've noticed that the above cars litsed are not ideal to drive around. They feel choppy and weird. They skip revs, have cut-off turbo sounds, and understeer like hell.

An example of this is demonstrated when, in the SBR, one is at half throttle and then goes to full. The car goes quiet for a split second, and then instantly revs up in a strained-sounding way. It's really odd.

When you make any minor change to the vehicle's throttle, the turbo bov sound comes in, but it's really cut off.
Let's say i'm in the SBR, and I'm at half throttle. After lightly tapping the throttle to full several times to get the bov sound to play, it's cut off and it sounds super weird.

Not to mention the understeer. I can barely go around a sweeping, nearly straight corner without understeering into a wall.

Hoping I could get some insight into this?

 

SBR4- AWD TTS2, default ESC, Arcade mode, XBOX controller (Happens on both manual and DCT)
K-Series- The dark blue AWD one (Can't remember the exact name) Default ESC, Arcade mode, XBOX controller (Happens on both manual and DCT)
Sport RS Sunburst- Sport ESC, Arcade Mode, XBOX controller (You guessed it, issues occur on both manual and DCT)
I have most of the driver assists enabled. My game is 100% set to default settings in that regard.

 

With some models understeer at high speed corners is because of aerodynamics, especially some race variants are having quite small amount of downforce at front compared to rear.

Let's not talk about ESC, devs are on it already, it might take a while as complexity of their work is quite staggering, but ESC is being addressed.

Anyway, AWD and TCS/ESC is cutting throttle very aggressively, especially with SBR.

I did test all these configs (default colors) and SBR failed quite badly, ABS just did not let me stop before the wall as I was turning back to pits after main straight, none of others failed so bad, also with SBR throttle cut is very aggressive compared to ETK where throttle is cut softly, but red ETK K-series had TCS light blinking whole lap around Hirochi.


Turning ESC off these configs are much better.

SBR cuts out also BOV sound a lot, but when throttle is opened more (by computer or by human driver) valve is closing so in way cutting is appropriate, but certainly it does sound different in reality, but perhaps here sound engine is limiting things a bit.
In some games BOV sound plays without any connection to physical BOV state and such of course is not issue with those games.

With Sunburst issue is somewhat related to fact that it is FWD car that has just tiny bit of rear wheel drive to it, it is not like Evo or WRX which can be quite tail happy as power is getting to rearwards, with Sunburst it is very FWD like.

With different tuning it is quite bit more fun to drive, 60% rear bias gives it much better cornering fun, by default I think it was 60% to front and when you accelerate bias moves even more towards front.

 

I think what he describes is thing that happens for example at 1:10 in video, 2nd lap is with ESC off and as can be seen there is not much of reason for ESC to cut in when driven like that, but it is how it is until you finish better one


K-Series RWD is bit overly protective too.

One major thing that contributes is that tire sounds are not happening until you are totally sideways which makes especially modern ones with current ESC to be fairly uninteresting to drive, when steering of K-series is added to equation car is quite dull and uninteresting, can't really compare to BMW M4 in Assetto Corsa for example, even M4 in AC is not the most interesting car to drive either.

Then again safety systems indeed do keep you safe as long as ABS does not fail when you drive twisty roads, but while TCS now works immediately, it does cut in quite a lot more than it should, even slightest amount of turning on straight road triggers it with some configs.

Sure anything is possible with enough tampering, around 500hp RWD SBR

 

Okay, but what about the rev-stuttering and audio oddities?

 

The ESC (currently) has problems.
1. Cut throttle at the wrong time: For all FWD/RWD/AWD vehicles it cut throttle when both understeer and oversteer. The ESC does (correctly) brake the inner rear wheel when understeer and brake outer front when oversteer, but it does not react to understeer at high speeds. The problem is in an FWD vehicle, cut throttle results in lift-off oversteer, thus the ESC should never cut throttle in an FWD oversteer. The same apply to RWD vehicles, the ESC shouldn't cut throttle during understeer.
2. Incorrect throttle reduction: The ESC cut "throttle" by retarding ignition and cutting the fuel flow but NOT partially close throttle valve, this makes the power reduction like an on/off switch.
3. Countersteering with ESC on will confuse the ESC, making the ESC acting weirdly.