Login


04092008, 04:12 AM  #1 
New Member
1
Rep 9
Posts 
Weight difference with different options?
I ve been wondering how much weight do the most popular options add:
 MDCT  Navi (Idrive stuuf)  Premium audio, parktronics, etc. What the power to weight ratio will be with the equiped car then? Thanks. 
04092008, 05:31 AM  #2 
Second Lieutenant
7
Rep 257
Posts
Drives: E93 M3 & Tuned Focus ST
Join Date: Feb 2008
Location: UK
iTrader: (0)
Garage List 2008 E93 M3 V8 [0.00]
2002 Honda S2000 [0.00] 1995 Suzuki Cappuccino [0.00] 2005 Boxster S [0.00] 2007 Ford Focus ST [0.00] 
MDCT adds about 45kg.
Nav (purely a guess!) could be 5kg??? Audio maybe another 5kg???? Difference in power to weight 250bhp/ton for a base Coupe Vs 242bhp/ton for a car with the MDCT etc...... however the MDCT car will still be quicker due to its better gearing and super quick shifts. 
Appreciate
0

04092008, 09:23 AM  #5 
Second Lieutenant
7
Rep 257
Posts
Drives: E93 M3 & Tuned Focus ST
Join Date: Feb 2008
Location: UK
iTrader: (0)
Garage List 2008 E93 M3 V8 [0.00]
2002 Honda S2000 [0.00] 1995 Suzuki Cappuccino [0.00] 2005 Boxster S [0.00] 2007 Ford Focus ST [0.00] 

Appreciate
0

04092008, 10:39 AM  #6 
Racying Dynamics
71
Rep 4,397
Posts 
Wow, that is nothing!! And NAV would have te be less than 5 kg as well IMO.
__________________
==================================================

Appreciate
0

04092008, 12:52 PM  #7 
Major General
231
Rep 5,306
Posts 
Honestly the only real option that will add any perceptible difference in weight are the 18's vs 19's. The 18's save about 46lbs per corner in unsprung weight. That is getting close to 100lbs. If you think about it thats like riding with a trim/short girl in the passenger seat.
Jason
__________________
Instagram: jellismotors 
Appreciate
0

04092008, 01:23 PM  #8 
Captain
22
Rep 649
Posts 
the sunroof does add some weight. I dislike sunroofs not just for the weight but the CF < steel < sunroof and the weight is at the top of the car which is almost the worst place to have it.
I think the steel roof is about 10 lbs more than the CF roof and the sunroof adds another 10 lbs. So in other words a sunroof on a coupe is probably 20 lbs more than the CF standard roof. I forget the exact weight but I think it's like 20 lbs. Likely the premium stereo weighs a fair amount with speakers and extra amps those things are not nothing. Last edited by rai; 04092008 at 01:39 PM. 
Appreciate
0

04092008, 01:28 PM  #9 
Major
49
Rep 1,162
Posts 
Unless you are going to be doing extensive timed runs on a track, you won't notice a difference in real life.
As far as being faster than a heavier M3 not only depends on the weight of the car, but the amount of fuel, driver skills etc. In my opinion, you should get the option you want unless you are going to build a track car and plan on gutting it out. 
Appreciate
0

04092008, 02:39 PM  #10  
Captain
22
Rep 649
Posts 
Quote:
Except the Vert option which is 400 lbs (I think) I have not driven but likely that's very heavy feeling compared to the least M3. 

Appreciate
0

04092008, 02:51 PM  #11  
Brigadier General
70
Rep 4,145
Posts 
Quote:
__________________
I've been assimilated. 6MT/ZPP/18"/PS extended. 

Appreciate
0

04092008, 09:47 PM  #12 
First Lieutenant
11
Rep 362
Posts 
Actually, GregW weighed the stock 19s with tires and is estimating 23 lbs front and 26.5 lbs rear (give or take a pound after subtracting tire weight). We won't know for sure until someone weighs the stock 18s, but the 19s may actually be the stock lightweight option for this car.

Appreciate
0

04092008, 10:32 PM  #13  
Lieutenant Colonel
16
Rep 1,504
Posts 
Quote:


Appreciate
0

04092008, 10:45 PM  #14  
Brigadier General
53
Rep 3,070
Posts
Drives: 2008 E92 Space Gray M3 & E36M3
Join Date: Dec 2006
Location: Greater St Louis Metro area

Quote:
__________________
Invest Wisely...The best mod for your money?? BMWCCA high performance driver's school. The mod that lasts a lifetime and improves the performance of any car you drive[/left]


Appreciate
0

04092008, 11:27 PM  #15 
Lieutenant Colonel
16
Rep 1,504
Posts 
Thanks. According to the weights listed on The Tire Rack, the 19" rears are 12 lbs lighter than the 18" and the fronts are 01 lb lighter than the 18s. They have several listed of each size so I'm not sure which weight to use, thus the range. I bet the combined tire/wheel weight between the 18s and 19s will be nearly negligible.

Appreciate
0

04102008, 02:18 AM  #16  
Brigadier General
204
Rep 4,853
Posts 
Quote:
this is unfounded. the 19's wiegh less than we thought thanks to greg for wieghing them. moonroof 56# DCT 45 # other misc. options 5# total 106 #. Last edited by sayemthree; 04112008 at 03:25 AM. 

Appreciate
0

04112008, 12:33 AM  #17 
Captain
13
Rep 624
Posts 
I read that the Steel roof weighs 12 lbs more than the CF roof, and getting the sunroof in the Coupe rather than CF adds 42 lbs. So in other words, getting the sunroof in the sedan should add about 30 lbs over just a plain steel roof.
To me this is real weight that is in the wrong location. Then factor in $1050 savings and I will be leaving the sunroof out.
__________________
Driving sideways: It's not faster, but damn it's more fun!

Appreciate
0

04112008, 04:02 AM  #19 
Banned
7
Rep 416
Posts 
just weighting the tires on a scale will not give you the true answer.
Moment of inertia needs to be calculated for the wheel + tire. When accelerating the available torque at the wheels will be fighting a greater resistance to angular rotation acceleration if the moment of inertia is higher and that will result in less traction on the road for acceleration. The moment of inertia is proportional to the distance of the mass to the centre of rotation squared. So 18 to 19 inch can still make a 11% increase even if the tires weight the same. 
Appreciate
0

04112008, 07:07 AM  #20 
Lieutenant Colonel
16
Rep 1,504
Posts 
That is correct and I touched on it in my post. I still bet it is going to be close between the two stock sizes because the 19" tires look to be a pound or two lighter than the 18s. Maybe that will help offset some of what the rim difference is because the tires are even further from the center.

Appreciate
0

Post Reply 
Bookmarks 
Thread Tools  Search this Thread 

