Alternative physics for Tommy78's Opel Kadett GSi DTM 1989 and Vauxhall Astra GTE BTCC 1989.
The original physics are set up with a live rear axle, which is incorrect. A live axle will not allow any camber- or toe in adjustments, and it will not behave correctly.
The Kadett/Astra actually had a twist-beam rear suspension, which is quite different from a live axle. Unfortunately, Assetto Corsa cannot simulate twist-beam suspensions (at least not with vanilla physics), so we have to cheat.
After investigating how others have done this for cars with similar suspensions, I landed on using a double wishbone suspension with a very stiff and non-adjustable anti roll bar. It seems to be the easiest way of getting a better simulation of the twist-beam suspension. And it allows for adjustments of camber and toe in, like the real car.
I have also taken the liberty to make the default setups somewhat more neutral, and I think the results are quite nice and much closer to the real car. AI performance doesn't seem to be affected much, but it might be necessary to BoP the car against other human drivers. Or not, depending on who's driving.
Installation:
Just replace DATA.ACD in the respective folders, make a backup of the original!
Happy driving.
The original physics are set up with a live rear axle, which is incorrect. A live axle will not allow any camber- or toe in adjustments, and it will not behave correctly.
The Kadett/Astra actually had a twist-beam rear suspension, which is quite different from a live axle. Unfortunately, Assetto Corsa cannot simulate twist-beam suspensions (at least not with vanilla physics), so we have to cheat.
After investigating how others have done this for cars with similar suspensions, I landed on using a double wishbone suspension with a very stiff and non-adjustable anti roll bar. It seems to be the easiest way of getting a better simulation of the twist-beam suspension. And it allows for adjustments of camber and toe in, like the real car.
I have also taken the liberty to make the default setups somewhat more neutral, and I think the results are quite nice and much closer to the real car. AI performance doesn't seem to be affected much, but it might be necessary to BoP the car against other human drivers. Or not, depending on who's driving.
Installation:
Just replace DATA.ACD in the respective folders, make a backup of the original!
Happy driving.
