03-18-2017, 03:26 PM | #1 |
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I weighed my 2015 M4 and 2017 M4 ZCP at the same time
Featured on BIMMERPOST.com Specs: 2015 (white) M4, DCT, 18" wheels, tank about 2gal from full, lighting package, exec package, M adj suspension, carbon roof, half cloth/leather seats. Front splitters & spoiler are the only non-OEM pieces on the car. 2017 (Blue) M4 with Comp package, MPE, lighting package, carbon roof, driver assistance + package, exec package, full leather, DCT. Gas was about 1/3 full when weighed so we filled it up afterwards and put 9.7 gal in. Subtract 1.7 for an even 8 gal to bring the two cars at least nearly the same volume of gas from full. Both cars have the HK sound system. Both cars have Iron Rotors and Blue Calipers. (No CCBs) 2015 = 3612 lbs 2017 = 3628 (lbs as weighed) + approx 6.2 lbs/gal @ 40-50 deg F x 8 gal = 3678 lbs Considerable difference of 66 lbs that may be mostly in the wheels and tires, and perhaps the stiffer suspension components but also all the driver assistance plus crap surely adds weight. What's interesting is supposedly the stock M4 exhaust is about 18 lbs heavier than the MPE so it seems to me these cars should be closer. Were they to have the same exhaust the 2017 ZCP would be about 84 lbs heavier. Seems apparent this is one reason why the ZCP is "slower" in a straight line according to some reviews. Last edited by Rocklobster; 03-25-2017 at 10:58 AM.. |
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03-18-2017, 03:29 PM | #2 |
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Edited to fix my math.
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03-18-2017, 03:57 PM | #3 |
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how could the ZCP be slower in a straight line with its extra BHP and bigger tires which should translate into better power delivery? Where did j00 read/see that?
got a link brah? |
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03-18-2017, 04:01 PM | #5 |
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http://www.bmwblog.com/2016/08/03/in...ition-package/
one of a couple Rolling and unsprung weight have a pretty big effect on performance, more than most people understand. 20" rims may look good to some but will always slow a car down over 18" rims, plus added weight always slows anything down. Wider tires have very little to do with straight line acceleration, both cars are still traction limited and on the same compound from the factory. Taller tires (which the zcp has) will also slow a car down in a straight line. This is assuming the larger diameter rims are indeed heavier, which for the factory wheels is true. I think the other reason is, since the both cars have the same peak torque the area under the HP curve is closer than the peak HP number difference indicates. Meaning, while the ZCP can produce a higher peak HP the actual power output through the usable rev range is very similar. Last edited by Rocklobster; 03-18-2017 at 04:14 PM.. |
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03-18-2017, 04:02 PM | #6 | |
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So at the same fuel load (near full) 2015 is 3612lbs 2017 zcp is 3678lbs Last edited by Rocklobster; 03-18-2017 at 04:15 PM.. |
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03-18-2017, 04:12 PM | #7 |
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I'm not sure how much weight the driver assistance stuff adds. I'm sure it's something but expect most of the difference is the larger wheels and tires and maybe some is related to estimates on gasoline and other differences in fluids.
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03-18-2017, 04:35 PM | #8 | |
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03-18-2017, 05:07 PM | #9 |
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No no no, it's definitely all the paperwork in the trunk. All those pamphlets and brochures they give you...
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03-18-2017, 05:10 PM | #10 |
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The dealer did Laminate the window sticker. I'm fairly certain that was their way of rubbing my nose in the fact that I traded an M4 for an M4 AND gave them a bunch of cash on top of the deal.
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03-18-2017, 07:06 PM | #12 |
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18" wheels to 20" wheels is a notable weight difference. I don't put much faith in the differences in times in reviews unless they were same track, same day, same driver, same approximate miles on cars and tires...
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03-19-2017, 02:09 AM | #14 |
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I don't think the wheels have that much of am impact, maybe less than 1-2lbs per corner (the beefier 18" tire may make up some of the weight difference from the 20" rim). Maybe the booming standard HK sound system is weighing down the 17...
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03-19-2017, 03:44 AM | #15 |
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OP, don't forget the added weight from Tanzanite Blue, easily 5-10lbs more than your previous white M4...j/k
The Satans are the biggest culprit.
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03-19-2017, 06:31 AM | #16 | |
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03-19-2017, 06:36 AM | #17 | |
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A few pointers: Unsprung weight does not have any direct incidence on acceleration, but has a strong incedence on handling. Rotating mass however does impact acceleration, but not necessarily to the extent most believe. The mass factor of wheels is about 1.5x while the one of tires is about 2x. So the added effective mass of the 666M over the 513M is no more than ~40lb, which is less the the moonroof to CF roof difference . Every bit counts, but it is not a night and day difference. The CP and non-CP have pretty much the same torque plateau up to 5500rpm, as you stated. But the CP has more power from then on, and that is where it matters for ultimate acceleration. I think the "slower" CP we've seen are more about test-to-test variance. Fuel tank size has not changed, it is still 60 liters. Also note that the MPE is 18lb lighter than the stock exhaust, a bit less than the 26lb you suggested. So your CP is ~84lb heavier. 29lb of that is from the 666M, leaving ~55lb from other options and other changes mad by BMW.
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03-19-2017, 01:35 PM | #18 |
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I should note then that both cars have the HK sound system. I had not thought of that.
I guess by unsprung weight i meant rotating mass in regards to the straight line performance. http://f80.bimmerpost.com/forums/sho....php?t=1092134 ...was my reference for the exhaust weight difference. |
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03-19-2017, 01:47 PM | #19 |
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60+ lbs. sounds like a lot for full leather and driver's assistance. Plus shouldn't ZCP seats weigh less with no lumbar support?
Any chance there was less gas than thought in the non-ZCP?
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03-19-2017, 02:09 PM | #20 | |||
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03-20-2017, 10:15 AM | #21 | |
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Ahh, i missed that. Last edited by Rocklobster; 03-20-2017 at 10:25 AM.. |
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03-20-2017, 12:30 PM | #22 | ||
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But the mass factor and effective mass calculations are physics based. A tire has a typical mass factor of about 2x while a wheel is about 1.5x. There is no way around this. Like I said, 21lb on added actual mass for the 666M wheel-tire combo results in no more than 40lb of effective mass. That is barely the effect of a half tank of fuel on straight line acceleration. Quote:
IMO, the greatest detrimental effect of the 666M wheel-tire package is the increased unsprung mass.
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