Finally managed to sneak up on my problem, and get a log without rF2 blowing up. Suspension isn't the issue. The tire rotation speed just goes bananas, for no apparent reason. (at over about 220km/h) I've redone the lookup tables for the M_30-65-18x11.5_S9M_Slick_2017.tgm to much higher speeds, and reduced calcpointaccel to 0.4, to make ttool capable of the higher speeds. (model had this problem earlier already though) So, to my actual point, does anyone have a idea of what parameter to adjust to stabalize the numeric solution for the rotation speed?