Tried the new GT4 on iRacing yesterday. Asside from the odd sound, that developers confirmed as a mistake that will be fixed in the next update, the car handles pretty similar to the road one in wet tires, added weight and less camber. I m doing similar lap times on Sebring, compared to real life. This never happened with Asseto Corsa G8x mods.
Its gonna be a good training tool.. and also a good target for mods, as there are some ways to make a road version to be more similar to the GT4, like you can see at