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04-18-2008, 10:46 AM | #45 | |
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...wrong thread.
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04-18-2008, 10:46 AM | #46 |
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04-18-2008, 11:00 AM | #47 |
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Yes, I noticed this other day. The sucker is heavy. I just weighed it:
The mobility kit: 1096 grams The foam insert that holds the kit: 275 grams I also weighed the front licence plate and its OEM holder part that I've been carrying in my trunk: 378 grams Original post update with these numbers...
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04-18-2008, 11:48 AM | #48 | |
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I've driven the car and I'm interested in it because I want a luxury sedan with world class performance. It could be lighter but that would sacrifice some of the characteristics I paid 70K for. If I tried to make it a little lighter with after market parts it would sacrifice a lot more of the characteristics I paid for with very little weight gain (150 lbs, seriously). After market fit and finish is never close to factory for obvious reasons. If I was looking for a lightweight car I wouldn't buy an M3 (it's too big!) I'd look for a Lotus or an Ariel or I'd buy a frame from Factory Five and build my own. You will wind up with a car that looks like an M3 but will have the fit and finish and interior quality of a Subaru WRX STI but weigh a couple hundred pounds more. This car is brand new, are you really going to trust the very limited opinions you get on fit, finish and quality of after market body parts? I hope you loose the weight and retain the quality. The car is heavy because of it's size (you aren't addressing that) and it's quality. Carbon fiber body panels are lightweight but after market ones will not fit as good. Best of Luck. I'll leave you alone. |
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04-18-2008, 11:53 AM | #49 |
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04-18-2008, 11:55 AM | #50 | |
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04-18-2008, 12:01 PM | #51 | |
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Then go for Mov'it ceramic... far superior to anything else...
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04-18-2008, 12:05 PM | #52 | |
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If you go to 18s the tires will be lighter as well, I believe. And you would be reducing unsprung weight . . . |
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04-18-2008, 12:11 PM | #53 | |
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Some stock parts weigh what they weigh because of cost considerations. BMW is trying to keep the MSRP low. For instance, the GrouppeM titanium exhaust system looks great, and I am sure it would work well as well. Couldn't BMW ship the car out with titanium exhaust? Of course, but would most people want to pay for it? No. Obviously, the car is heavy because it is big. That is the main cause. Fine, but so what? The option is not to buy a Lotus because I don't want to be driving in a Lotus around on the streets. I want this car to weigh as much as a E46 M3, and there is no such car out there with an engine comparable to the E92 M3 engine. Dropping this engine into a E46 M3 would be great, but that ain't gonna happen. Not worth it. So, exploring the bolt on/off weight reduction approach makes sense to me personally, but it all depends on cost in the end, which is I posted this thread and asked the questions I asked...
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04-18-2008, 12:13 PM | #54 | |
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longevity (great benefit) weight (good benefit) fade resistance (small benefit) brake power (little to no benefit) cost (outrageously high) |
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04-19-2008, 11:51 AM | #55 |
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Well, that would blow the cost all to hell. Of course, it would reduce the weight to zero since you'll be losing the car to the ex.
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04-19-2008, 11:55 AM | #56 |
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Stock wheels are forged, right? So to get lighter and just as strong wheels, would be big bucks. It's worth it for some, especially if you're going for looks. But for saving weight, plus the fact that it is unsprung weight and affects rotational mass, a few pounds would make a difference. I just don't know what is out there yet in E9x M3 fitment, looks, strength and weight.
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04-19-2008, 11:58 AM | #57 |
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Why would tires be lighter? To keep the same rolling diameter the tires need to be bigger, i.e. higher sidewalls. This makes the tire heavier. What is wanted is lighter wheel and tire combo. Smaller wheel, heavier tire and vice versa. Going to smaller wheels does not automatically make the combo lighter.
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04-19-2008, 01:40 PM | #58 | |
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04-19-2008, 04:21 PM | #60 | |
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Tirerack says 24/25 lbs F/R for the stock tires.
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04-19-2008, 04:29 PM | #61 |
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Are those 19" tires? Then what are the same weights for the 18s? It would be nice to know. I'm betting there is not too much difference. I still can't find that post but IIRC they had both weights in there.
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04-19-2008, 04:45 PM | #62 | |
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18" BMW spec PS2s: 24/27 lbs 19" BMW spec PS2s: 24/25 lbs http://www.tirerack.com/tires/Spec.j...D64YR8SPORTPS2
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04-19-2008, 05:18 PM | #63 | |
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18" 23.2/24.9, say 23/25 19" 23.6/26.1, say 24/26 So, all up weights with PS2 are: 18": 47/52 19": 48/51 Yep. Pretty close. So, let's say for all practical purposes there is no weight savings whether you get BMW 18s or 19s. After-market wheels/tires would have to beat this to realize a weight savings. Pretty hard to do without spending big bucks (i.e. high quality forged wheels). Cheers.
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04-19-2008, 05:23 PM | #64 | |
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47/51.5 lbs and used the tirerack tire specs to deduce: 23/26.5 lbs for the wheels Is that what you are referencing? The example I used in the OP, Morr mono-forged VS8 wheels, are supposed to be pretty solid (in quality and strength). And they are supposed to weigh ~ 20/23 lbs and cost ~$2500. Would save about 13 lbs total. Also, does anyone have weight data on the driveshaft? (I am assuming there is very little weight or rotational inertia reduction to be had there with a quality CF shaft).
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04-19-2008, 05:41 PM | #65 | |
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Drive shaft? Are you serious? Is that not a major undertaking? I didn't think anyone made these anyway. But not a bad idea. Not only would you be getting lighter mass, but also lighter rotating mass -- should increase throttle response.
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04-19-2008, 05:46 PM | #66 | |
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No way am I going to replace the driveshaft of a car that is under warranty. I thought there were some CF options available for the E46 M3 though?
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