RWD cars snap unpredictably

Noticed the same thing quite a bit on the wheel. 

Switched to controller and correcting snap oversteer became a lot easier. Might bring the wheel rotation down and see if that helps.

I noticed same problem. It feels impossible to slide with RWD. In one moment it doesn't slide, in next snaps off the road.
I remember in Dirt 2.0 it was more gradual. You could catch a RWD car in slide and make corrections.

I started to notice this with some AWD cars too, but the AWD helps mask this issue.

The sliding grip just isn't as gradual as previous games, hope they fix this.

i have noticed exactly the same thing. based on my playtime so far, it seems to be connected to how the rear suspension "squats," e.g. when coming to the bottom of a dip as the road levels out, or especially when it goes back up. this is a thing in real life too - if there isn't enough travel in the rear suspension and it "bottoms out" before absorbing all the cars downward energy. however they really shouldn't be bottoming out like that in these cases, so there's definitely something weird going on.

Yeah, there is something wrong with handling when it comes to wheel spins and slides. I tried B group RWD Lancia on gravel. I can start with max RPM and car acts as underpowered AWD car on tarmac with good grip. For a moment RPM gets lower and then she just goes almost in perfect straight line. With no crazy wheel spins and dancing rear, as you would expect from powerful RWD car, especially on gravel.
Then I tried to do a donuts with gas pedal to the floor. It's also doing something strange. Like moment from moment car finds magically grip and RPM lowers, which shouldn't be the case.
With AWD cars it seems similar, only it's masked better. Unfortunately due to this cars don't slide as they should. Which is quite a bummer, because for me this was one of the most fun things in DR2, to take some group A or B car on gravel road and violently slide from corner to corner.
Maybe this is some assist which isn't turning off or maybe this has something to do with car setup (differential maybe) or maybe it's just the way handling has been implemented. I'll try to experiment with different cars and setups. Maybe I'll be able to find something that feels right for me. But I really hope they can look into this, because there is definitely something wrong.

Also, handbrake is working strangely, it's seems that she is applying too much braking force for the whole car.

I experimented with group A and group B AWD. I put all torque bias to the rear. Tried different position in front and rear diffs. You would expect that powerful AWD with torque 70% to rear should oversteer as crazy, but this is not the case. Cars just don't want to loose grip in rear and get into slides. You need to really throw them to get into slide. After which they really want to get back straight. You really need to force the slide and force it to keep sliding. And it seems that it's the case with any diff settings and probably with any car. I guess you could justify it in new WRC cars, but not in older cars. With RWD cars it's just more evident. They go only straight or they just snap, if you're too aggressive. 🤨

After 1.4.0 I feel no change. RWD cars still snap unpredictably and the slides are not progressive in the slightest.

Although I prefer WRC's general feeling, DR 1 and 2 didn't have this issue and it's sad to see that it hasn't been addressed yet.

While this affects RWD cars the most, AWD cars can also have this problem. FWD cars seem mostly fine and coasting through a turn in others feels alright leading me to believe it is a differential sim issue, even with a pretty open differential this can still happen.

was really hoping they would fix this for the CER rally but havent. Really frustrating because the game has so much potential to be good that they wont make adjustments to the physics. To me, it seems like the transition from grip to no grip is too sharp, it needs to feel gradual, there doesnt seem to be a chance to catch the slide a hold it. I could be completely wrong but it seems like they just need to change a few values int the physics and bang, you have a great game on all surfaces. I'll give it till the next big update to see if they even care about the game and the community and listen to us about making these changes otherwise I have lost complete faith in Codemasters.

The RWD snap loss/regain of grip is quite miserable feeling to drive. There's just no way of holding a nice slide in cars which are famous for going sideways.

However i have found that reducing your steering saturation to around 75% of what you use on other car classes helps a lot to at least catch the slide and prevent a full on spin.

But i agree with an above poster, it feels like the handling model has been skewed towards main it more exciting / engaging to controller users who can correct with the flick of a thumbstick, instead of wheel users who are able to input more fine steering and throttle adjustment but it's slower input (unless you whack down the DOR). Not that i have tried it on controller. That's just how it feels to me

Its bad on controller too sadly.