Curious. What do you attribute the lack of sense of speed to? Or in the case of a game that you get a sense of speed from what is it? Seems to me that whether I'm driving at 80 on the freeway or 25 in town it feels the same, looks the same, sounds pretty much the same. Is it about FOV? Sounds? Or not something not so easy to pin down?
I don't know, but in AC I always feel like I'm going 30mph. Doing 75mph on the highway in my car definitely feels and sounds different than going 30. Lots of wind and road noise, little bumps feel like big bumps, small steering inputs result in bigger reactions. In R3E if you're going 150mph it's downright frightening, you feel like a rocket and minor inputs have big effects. You can feel a sense of momentum, I don't get that in AC. In R3E I feel the world moving around me, in AC I feel like I'm on a treadmill watching a movie of someone driving a car.
R3E does take some tinkering to get it feeling right, and never quite feels perfect. Also, the free content has old physics so the cars don't feel as good as newer cars. But it's sounds are second to none, AC doesn't even really compare. And the trackside visuals make you feel like you're at an actual racing event, AC feels like you're at a track day at an empty track. It has a great selection of cars and their classes are very well balanced to each other. You do have to pay for content but it's a helluva lot cheaper than iRacing and once you start owning some content you can get big discounts on other content. And the AI is outstanding, I've had races that were as good or better than a lot of human races I've had.
I can't put my finger on it, but when I get done hot lapping in AC I'm like "eh" and if I race the AI it feels like a chore and I can't wait for it to be finished. When I get done racing in R3E I'm shaking and sweating and sore and yelling "THAT WAS F'ing AWESOME!!".
I'm not trying to bash AC, I realize they're a small team and their physics/FFB feel good but I feel like the rest of the game is an afterthought and the overall experience doesn't really excite me. It's fine for hot lapping on hill climbs, but one of the main reasons I bought a PC was because I was tired of doing nothing but hot lapping in GT, so that just doesn't appeal to me much right now.
I hate iRacing, think it feels terrible and the ranking system is too extreme. GSCE seems to be the best of all worlds (except for graphics, but they're still good), but something is screwy with the FFB on my install so I can't fully enjoy/explore it at the moment. But once it's sorted I could probably give up the other two games (except for the hill climbs). It feels good, sounds good, has a good sense of motion, lots of features/mods, and a good community. Those are the things I want in a Sim and both AC and R3E are lacking in several of those departments. But I still enjoy all of them on different levels (except iRacing. Hate iRacing).