Why do you assume that they are fine? That suggests that you think that the physics engine is different for different cars...
On the contrary, that's the point
A physics engine is not a trivial thing to replace. A physics engine underpins the entire game. Within that, there's various components, like the suspension. To say that "the engine" is broken, or that the "suspension model" is broken is visibly impossible. The game would, whole sale, not work in either of those cases. Not just "road cars", it would be ALL cars.
Therefore you ought to be entirely aware that 1.52 is the same physics engine, which affects all cars in the same way, as 1.49 and whatever the issue is can only affect all cars if their settings can be parked into the problematic ranges. If a car cannot have the settings entered in this manner, it won't experience the issue, and that certainly appears to be the case for the Gr.4 and Gr.3 racing cars used predominantly in Daily Races.
Even with 1.49. There was a huge issue, but the engine wasn't broken. Was the bug serious? oh yes, but did it break the game entirely no. And yet again, we aren't talking about 1.49, we're talking about 1.52. There have been obvious adjustments made because I have not seen, nor heard, of cars launching into space anymore. So, I don't want to conflate the two. I want to talk about 1.52
It appears that the issue is more emergent on road cars - those with softer possible suspension settings, longer-travel dampers, or with sufficiently floppy chassis that higher levels of mechanical grip can cause unusual behaviours - than it is on race cars where none of that is relevant because their settings can be parked into the problematic ranges. It ought to be no surprise that if you race Gr.3s all the time you won't see it. Why the issue affects Evos so overtly escapes me, but I wonder if there's some mimicry of AYC or something similar.
What's the issue? Based on the play and the statements in this thread. Probably the way the springs and dampers work now that the tires seem to have a little spring and damper in them as well. Since the race cars are using race tires, which would have less spring in them, the GR cars will have less noticeable issues (just a guess).
Why the EVO? Like that special sauce combination of being very front end heavy with soft springs. But, you've seen the test videos in this thread, one of them my own, and some never experienced an issue. If this thread didn't exist, I'd be one of them.
That it can be tuned out (by making suspension stiffer [spring and rear rebound particularly] or not overdoing the grip) is moot; it doesn't bear any relevance to the fact that the issue is there in the first place.
Again, the reluctance to acknowledge this is bewildering, as are the circular reasons for rejecting it.
This "issue" is being argued as a game breaker. Have any of the time trials been rendered unplayable? Not to my knowledge. Have any of the events been rendered unplayable? Not to my knowledge. So, it's not a game breaker. It's just an annoyance, again, to some. I'm not one of them. I don't care if the cars are bouncy. I just drive what they give me. Until that car cannot be used in the event that is intended for, then, to me, it's a non issue. I did the BMW time trial this morning. Nothing hindered me from doing it.
So, if we are not talking about game progress, or an event that requires the default setting, why torture oneself with the default settings? People go on like the suspension numbers are somehow decried by the almighty. They're just arbitrary values that some dude in a cubicle decided upon. That's all they are.
Here's the thing, and I'm just shooting this straight. Anyone who codes and fixes bug will back me up on this. It will be addressed based on the severity of the bug. Crash bugs will get an A rating, other glitches will get a B rating, etc., etc. A bouncy suspension that needs another tweak is way down the list. So, until they address it, IF they address it at all, just toss adjustable suspension on the car and be done with it.
Here, I did this while my wife was getting ready for bed, as an example.
Charger BONE STOCK
Charger, Stock with adjustable suspension and all I did was crank the dampers to max. This is my test lap.
And that's where I'm coming from. All these people going on like it's the end of the world, and how they refuse to play until it's fixed. Just get on with it. It's an easy fix. Because, again,
it might never get fixed because it has an existing, in game, work around that the 1.49 bug did not have.