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      01-10-2015, 02:41 PM   #1
Accel Junky
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F8X Weights & Weight Reduction Data - Ongoing List

I figured it might be useful to get an official weight thread going (since I will be doing it in a spreadsheet for myself anyways...). I picked up a set of Intercomp corner scales (1500b capacity per pad) that I have been wanting for quite some time. I usually like to get a baseline weight before I get started modding as I like to keep everything tracked on a spreadsheet with reducing weight in mind for every part I choose (I weight parts on a calibrated 75lb postage scale). I like the challenge of saving weight without sacrificing too much for daily driving. For some people maybe it is for the track, for me I like to improve my braking, acceleration, and fuel economy for as little $$ as possible. Doesn't matter how minuscule each item I save weight on, I enjoy the challenge.

I have two F80s at my immediate disposal, but if I can have some of the other local metro-Atlanta folks swing by I could get even more data about the cars' weights with various options as well as get some F82 and F83 on the scales. But for now this is a start.

If you have any weights you'd like to add that have been weighed on a package or postal scale for parts that I haven't mentioned, please respond and I'll add them. I just ask that we avoid the bathroom scales... I will be adding more weights myself as I have time.

Stock Curb Weights (100% full tank of 93oct unless specified, as weighed on Intercomp corner scales as noted ACTUAL):
3446 lbs = F80, 6MT, 18s, Extended Leather, Carbon Roof, NO FUEL (CALC'd w/ part weights)
3454 lbs = F80, 6MT, 19s, Extended Leather, Carbon Roof, NO FUEL (ACTUAL)
3544 lbs = F80, 6MT, 18s, Extended Leather, Carbon Roof (CALC'd w/ part weights)
3552 lbs = F80, 6MT, 19s, Extended Leather, Carbon Roof (ACTUAL)
3593 lbs = F80, 6MT, 18s, Extended Leather, Sunroof (ACTUAL)
3601 lbs = F80, 6MT, 19s, Extended Leather, Sunroof (CALC'd w/ part weights)

Factory options add X weight (over stripper):
19" Wheels = 7.6 lbs TOTAL (all 4 wheels)
Sunroof F80 = 49 lbs
Extended Leather = ?

OEM Individual Component Weights:
OEM Sprung:
Full tank of 93 octane = 100 lbs (vs empty)
Body Chrome-look ///M3 fender marker = 0.07 lbs (each)
Body Chrome-look front grille surround = 0.29 lbs (each)
Engine M Power cover = 1.23 lbs
Interior User manual binder = 2.2 lbs
Interior Front floor mats = 2.76 llbs (for the pair)
Interior F80 Rear floor mats = 1.64 lbs (for the pair)
Interior front leather seat = 57.6 lbs (each, Source: PSI)
Interior F82 rear seat = 40 lbs (Source: Karussell)
Interior oh-shit-handles w/ plugs = 0.21 lbs (each, based on driver's handle)
Trunk cargo net = 0.58 lbs
Trunk F80 floor panel = 7.00 lbs
Trunk M Mobility kit = 3.74 lbs
Trunk F80 tray (left side) = 0.35 lbs
Trunk lid warning triangle mounts w/ screws = 0.11 lbs
Trunk Li-Ion Battery = 30.00 lbs (source: EAS)
Trunk battery access cover w/ tool kit = 1.82 lbs
Trunk batter access cover w/o tool kit = 0.53 lbs
Trunk tool kit = 1.29 lbs (cover, tow hook, screwdriver)
Trunk tool kit screw driver = 0.10 lbs
Trunk tool kit towing hook = 1.05 lbs
Trunk tool kit cover = 0.14 lbs
Trunk spare tire well tray = 2.66 lbs
Trunk lid arm covers = 0.48 lbs (for the pair)
Exhaust OEM Full System = 69 lbs (source: EAS)
Stock Catted Downpipes = 15.45 lbs (source: EAS)

OEM Unsprung:
Wheel Lug Bolts = 2.84 lbs (for all 4 corners)
Wheel Lug Bolts = 0.71 lbs (per corner)
18" Front Wheel w/ OEM Tire = 44.20 lbs (each)
18" Rear Wheel w/ OEM Tire = 48.16 lbs (each)
19" Front Wheel w/ OEM Tire = 46.48 lbs (each)
19" Rear Wheel w/ OEM Tire = 49.68 lbs (each)
18" Front Wheel = 20.60 lbs (each, extrapolated)
18" Rear Wheel = 21.46 lbs (each, extrapolated)
19" Front Wheel = 22.88 lbs (each, extrapolated)
19" Rear Wheel = 23.78 lbs (each, extrapolated)
18" OEM Front Tire Michelin Pilot Super Sport 255/40/18 = 23.6 lbs (each, per Michelin)
18" OEM Rear Tire Michelin Pilot Super Sport 275/40/18 = 26.7 lbs (each, per Michelin)
19" OEM Front Tire Michelin Pilot Super Sport 255/35/19 = 23.6 lbs (each, per Michelin)
19" OEM Rear Tire Michelin Pilot Super Sport 275/35/19 = 25.9 lbs (each, per Michelin)
Suspension OEM Rear Adaptive Spring/Cup/Rubber Pads = 6.68 lbs (each side)
Suspension OEM Rear Adaptive Bumpstop = 0.12 lbs (each side)
Suspension OEM Rear Adaptive Spring/Cup/Rubber Pads w/ Bumpstop = 6.80 lbs (each side)
Suspension OEM Rear Adaptive Spring = 5.74 lbs (each side)
Suspension OEM Rear Adaptive Strut/Top Mount/Bump Stop/Dust Shield = 6.28 lbs (each side)
Suspension OEM Front Adaptive Full Strut/Spring Assembly = 13.6 lbs (each side)
Suspension OEM Front Adaptive Top Mount = 3.0 lbs (each side)
Suspension OEM Front Adaptive Spring = 3.64 lbs (each side)


Replacement part weights:
Unsprung:
Macht Schnell Extended Lug Bolts = 0.99 lbs (each corner or 15.8oz)
Macht Schnell 12mm Spacer = 0.75 lbs (per spacer)
Macht Schnell 15mm Spacer = 0.94 lbs (per spacer)
Rogue Engineering 12mm Spacer = 0.58 lbs (per spacer)
Rogue Engineering 15mm Spacer = 0.73 lbs (per spacer)
Rogue Engineering Extended lug bolts = 0.99 lbs (each corner)
KW HAS Rear Assembly (everything but the strut assembly) = 6.08lbs (per side)
KW HAS Front Assembly (as assembled on front strut with OE top) = 15.32 lbs (per side)
Sprung:
Body front grille surround BMW gloss black = 0.24 lbs (each)
Akrapovic Exhaust = 43.5lbs (source: EAS)
M-Performance Exhaust w/ Carbon Tips = 42.80lbs (source: EAS)
AR Design Design Catless Downpipes = 7.2 lbs (source: N54Tuning)
Evolution Racewerks Catless Downpipes = 8.05 lbs (source: EAS)

------------------------------

Misc photos from weighing:






Completely empty fuel tank, F80 6MT, basic leather, 19" wheels no other options:





Completely FULL fuel tank, F80 6MT, basic leather, 19" wheels no other options:





Completely FULL fuel tank, F80 6MT, sunroof, basic leather, 18" wheels no other options:



Last edited by Accel Junky; 05-07-2015 at 10:47 AM..
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      01-10-2015, 02:47 PM   #2
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Great thread !!!



Beautiful garage BTW
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      01-10-2015, 02:50 PM   #3
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Interesting info about the 18" vs 19" wheels/tires where the 18" fronts are heavier while the 19" rear are heavier.
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      01-10-2015, 03:25 PM   #4
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Quote:
Originally Posted by CanAutM3 View Post
Interesting info about the 18" vs 19" wheels/tires where the 18" fronts are heavier while the 19" rear are heavier.
I might need to go back and re-weigh them. I have a second postage scale so I may double check on that. I checked the weights PSI got from their silver 19s and the rears are similar but the fronts are off by a few lbs.
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      01-11-2015, 04:22 AM   #5
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Thanks for a really helpful thread. I like it when everything is done scientifically!

Surprising how much weight you can get out by removing non essential stuff such as manual, floor mats, trunk bits and pieces etc.
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      01-11-2015, 08:25 AM   #6
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      01-11-2015, 12:15 PM   #7
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Good thread
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      01-15-2015, 12:43 PM   #8
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very well put together
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      01-15-2015, 01:53 PM   #9
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So ditch the seats, gas tank and the wheels and I'll be good to go
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      01-15-2015, 02:09 PM   #10
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thank you for your service, good sir. love that garage and its tenants.
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      01-18-2015, 05:21 AM   #11
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http://f80.bimmerpost.com/forums/sho....php?t=1020511

Interesting, the difference between these and yours.



EDIT: Just noticed the CCW Classics on your NSX, there.

I'll probably be going LM-20 again on the F80.
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      01-18-2015, 11:32 AM   #12
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Quote:
Originally Posted by Vectors2final View Post
http://f80.bimmerpost.com/forums/sho....php?t=1020511

Interesting, the difference between these and yours.



EDIT: Just noticed the CCW Classics on your NSX, there.

I'll probably be going LM-20 again on the F80.
Yeah, that does have me wondering. I noted that earlier.

I've got another scale of the same make and a third scale that I may do a quick test on to see if I see the same relationship between the 18s/19s.
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      01-18-2015, 03:43 PM   #13
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Quote:
Originally Posted by Accel Junky View Post
Quote:
Originally Posted by Vectors2final View Post
http://f80.bimmerpost.com/forums/sho....php?t=1020511

Interesting, the difference between these and yours.
Yeah, that does have me wondering. I noted that earlier.

I've got another scale of the same make and a third scale that I may do a quick test on to see if I see the same relationship between the 18s/19s.
Only meaningful discrepancy is with the front 19" IMO.

EAS - Accel Junky
18F: 44.00 - 44.20
18R: 48.25 - 48.16
19F: 45.90 - 43.46
19R: 49.85 - 49.68

Might want to double check that one only
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      01-19-2015, 05:33 PM   #14
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Quote:
Originally Posted by CanAutM3 View Post
Only meaningful discrepancy is with the front 19" IMO.

EAS - Accel Junky
18F: 44.00 - 44.20
18R: 48.25 - 48.16
19F: 45.90 - 43.46
19R: 49.85 - 49.68

Might want to double check that one only
I reweighed and got 46.48lbs on the front 19" via a couple of different scales including my original scale. I'm going to update that in my original post. Doesn't explain why all the rest of mine are lower weight than their measurement...but hey.
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      01-19-2015, 05:37 PM   #15
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Quote:
Originally Posted by Accel Junky View Post
I reweighed and got 46.48lbs on the front 19" via a couple of different scales including my original scale. I'm going to update that in my original post. Doesn't explain why all the rest of mine are lower weight than their measurement...but hey.
Not all were lighter, your 18" front was heavier. But overall, 1~3oz difference is nothing .
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      01-19-2015, 05:39 PM   #16
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Quote:
Originally Posted by CanAutM3 View Post
Not all were lighter, your 18" front was heavier. But overall, 1~3oz difference is nothing .
Oops...yes you are correct.
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      01-20-2015, 09:41 PM   #17
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Great thread, this should be a sticky.
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      01-21-2015, 06:24 PM   #18
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^^ Thanks! Weight threads are one of my favorites.

So, I thought I would get clever tonight and see what an oh-shit-handle delete would save. Considering there are 4 handles in the sedan and they are at the very top of the car I figured it was a good place to delete weight. One...I don't use mine at all and two my wife was using the door grab handle to hang on at the Nurburgring and any other time I warn her "hold on to your shorts". So I figure they really are not needed.

Here's the thing though... BMW has deleted the screw system holding them in. Also, the plastic handles appear to be hollow with some substructure making them amazingly light.

With caps, the handles only weigh 0.21 lbs each. So at best you are saving a little over 3/4 pound from above your head if you factor in the weight of delete plugs (I'm not sure if those are even available).

Still...given delete plugs, it might be worth taking them out since they do nothing for me. In the rear a single hook could be added (perhaps from M4?) for clothes.

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      01-21-2015, 06:33 PM   #19
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Excellent thread Accel, thank you!
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      01-21-2015, 06:38 PM   #20
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Excellent thread!

As you've mentioned above, when looking at component weights one of the incredible realities that emerges is how light BMW has managed to make some pieces, while retaining full functionality.

I look forward to watching the community work together to make these cars as light as possible.
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      01-21-2015, 06:45 PM   #21
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Quote:
Originally Posted by Ilia@IND View Post
Excellent thread!

As you've mentioned above, when looking at component weights one of the incredible realities that emerges is how light BMW has managed to make some pieces, while retaining full functionality.

I look forward to watching the community work together to make these cars as light as possible.
Yes, I'm starting to realize just how hard it is going to be to save weight on this car for no cost. And another thing is that some of the low hanging fruit (like the exhaust and battery) is going to take the car even further towards front weight bias. The car is already a little front heavy (51.5/48.5...not quite 50/50) but I'm thinking losing enough weight in the front to reach 50/50 is going to be quite tough.
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      01-21-2015, 07:35 PM   #22
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Quote:
Originally Posted by Accel Junky View Post
Yes, I'm starting to realize just how hard it is going to be to save weight on this car for no cost. And another thing is that some of the low hanging fruit (like the exhaust and battery) is going to take the car even further towards front weight bias. The car is already a little front heavy (51.5/48.5...not quite 50/50) but I'm thinking losing enough weight in the front to reach 50/50 is going to be quite tough.
Agreed- aluminum uprights and suspension components, polyurethane bumper, etc and weight savings at the front of the car become a tricky proposition.

The radiator support at the front of the car is a bolt-in steel piece of considerable weight. I had thought to build this piece from carbon fiber to retain full rigidity while saving a substantial weight, but considered this part to be of little interest to M owners. This thread is making me reconsider.

True race cars could save substantial weight in several places, but functionality would be lost. Items like the windshield washer system, AC, headlights, and so on could all be removed if the car was a race-only vehicle.
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