Quote:
Originally Posted by CSBM5
This was first implemented over 10 years ago by Cadillac in the CTS-V, so it's nice to see BMW finally getting around to it. Cadillac were the first to finally put a damper (pun, lol) on the IRS "axle-hop" dynamic problem. It's a ridiculously complicated non-linear dynamics problem with many different degrees of freedom. We've all felt it when accelerating hard in an IRS car and one gets the stuttering wheel hop shaking. There is a "wind up" of energy when the tire has grip that eventually (talking in very short timeframes here) is unleashed causing the tire to break traction only to then recycle with another wind up cycle, etc, etc.
Cadillac discovered that if they employ the proper ratio of torsional stiffness between the two IRS half-shafts (based on that huge number of variables overall dynamics problem), they can allow for absorption/release (so to speak) of said energy and greatly reduce the cyclic build-up/release cycle. Said design was first on the gen2 CTS-V but then also shared with other GM cars with an IRS.
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Agreed, this isn’t new breakthrough tech.
Maybe axle hop was more of an issue on the G8X so they had to remedy it.