Quote:
Originally Posted by SoManyBlueCars
I'm sorry, I don't mean to make fun here at all. But I see everyone going bananas here for the moonroof delete option. Wut?
You're in an SUV. You don't notice it in an M3 if it has a moonroof, and you're sure as hell not going to notice it in these things. These are great trucks that handle well for what they are, but I can't imagine anyone tracking this, so really, get the roof folks.
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Yeah... so, where to start...
You begin by making a disclaimer about not wishing 'to make fun here at all.' OK, we're listening. Then you proceed with comments, "in these things", and "these are great trucks"... And then topping it off with the usual and mundane, "I can't imagine anyone tracking this, so really, get the roof folks."
Probably not the ideal way to be taken seriously on the X3M/X4M Forum which is frequented by those interested in BMW's Performance Engineering, and how best to maximize such in the vehicles we drive, track or no track. Many of which are M2, M3, M4, and M5 Drivers.
Some estimated numbers:
Your M3: HP 425, roof width 42", roof length 60", roof surface area 2520 sq in, wt Al Roof 21.3 lbs, CFRP roof wt 8.7 lbs, ht 56.1", est CG 20.8", vehicle ht above CG 35.3", AL roof moment 62.5 ft-lbs, curb wt 3630, SSF 1.505, wt moon roof ~27.1 lbs, moon-roof moment 132.7 ft-lbs, Wt (lbs)/HP 8.5. (
Rough numbers)
The X3M Comp: HP 503, roof width 44", roof length 80", roof surface area 3520 sq in, wt Al Roof 29.7 lbs, CFRP wt 12.1 lbs, ht 65.7", est CG 24.4", vehicle ht above CG 41.3", AL roof moment 102.3 ft-lbs, curb wt 4620, SSF 1.351, wt moon roof ~126.6 lbs, moon-roof moment 485.9 ft-lbs, Wt (lbs)/HP 9.2. (
Rough numbers)
Not sure these numbers mean much to you, but they tell a very different story about the actual Physics involved, and how replacing the X3M's moon roof with even OEM Al makes a far greater composite difference to the handling and dynamics of the X3M Comp as it would to the smaller-roof'd, lower and wider slung M3 - quite counter to your generalizations. You can try to make the argument 'are you going to track it, if not then you won't notice a difference', but you do realize how hollow that sounds on a Forum filled with BMW Enthusiasts?