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Since G30 and G20 are sharing same CLAR platform, percentage of torsional rigidity should be inline with G20.
For Comparison:
E46 - 18,000 Nm/deg
E90 - 22,500 Nm/deg
F30 - 29,300 Nm/deg
G20 - 36,625 Nm/deg (based on 25% more than predecessor, could be higher in body stiffness in certain area if 50% is applied)
E39 - 24,000 Nm/deg
E60 - 24,200 Nm/deg
F10 - 30,200 Nm/deg
G30 - 37,750 Nm/deg (based on 25% more than predecessor)
As we can see there is a steady increase in 3er since E46 with average of 25% - 30% torsional rigidity improvement. Except between E39 to E60, there should be an average of 25% improvement on 5er.
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