I have noticed that the Cherrier Vivace has a permanently locked centre diff under braking and maybe acceleration in its rally variant. I tried this theory on ice. I removed the front brakes entirely, and then used maximum braking force on ice. Under these conditions, only the rear tyres should lock, but in this case, all 4 tyres locked together. The handbrake disconnects the front and rear so using the handbrake will not recreate this problem. This makes the Vivace exceptionally unresponsive under braking, and too stable. To fix this, the centre diff should be chanaged to an adjustable one. The Vivace is supposed to be a 2017-2021 WRC equivalent, and they had adjustable centre diffs. This video from 2020 explains how this works: This will make the Vivace Rally more responsive, less stable, and more realistic.
