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Originally Posted by 0w40X1
I just looked up x35i which is a whopping 361# more than s28i with most of that weight over front.
I bought the s28i for it's lighter weight, but I can tweak to minimize trouble.
I think if I put 361# weight on front end, I'd never notice the sway.
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Remember, a lot of it standard content, including the sunroof and 18 inch wheels. So a highly specced 28i can be pretty close to a low spec 35i. The actual motor weight is further forward in the 35i which certainly makes a difference, but it's probably more like 4-5%, not 10% like your number.
Ah, just noticed you're also comparing the sDrive. So you do have the additional 120 or so pounds of xDrive fluff up there on the 35i plus a little for the more complex hydro steering rack with servotronic. So you probably do have a little different balance in the s28i.
We changed from a 135i to this and both have a nearly equal weight balance and neither were terribly stable at high speed, something a 911 achieves with only 35% of the weight on the front wheels.