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Originally Posted by SWOT1
Pretty simple answer. BMW has always tried to maintain their series hierarchy, meaning the X5M must be faster than an X3M (at least according to official public numbers.) I think this works greatly in our favor as X3M/X4M owners, as we got some serious bang for the buck with this S58!!
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For sure. I've started to look at updating the Performance SAVs chart but realize this will be a difficult project to keep updated as the models (and data) change so much it's hard to keep track. And there isn't a central clearing house for confirmed data.
But, BMW indicates in their model release information the 2020 X5M and X6M (Comp models) are showing curb weights of 5425 and 5375 lbs., so with HP of 617 that yields Wt/HP ratios of 8.79 and 8.71. With our X3M and X4M Comp models showing real world dyno and 1/4 mile data suggesting 550 HP with weights of 4620 lbs., that yields ratios of roughly 8.38. So it'll be surprising to see those models perform better than the F97/98 editions. More plush and luxurious, no doubt.
But until we see some actual performance trials of these larger siblings, it's hard to know if BMW is undercutting their HP and torque values as well.