1M Weight Thread

[mPlasticDesign]

Thought I'd start a thread for 1M weight. Weight in options, weight reduction through aftermarket parts and so on... The biggest reason the 1M is quicker than the 135i is the lower weight through lighter suspension components and sunroof.

I posted this a few years back about the M3 but still helpful when discussing the 1M:

http://www.m3post.com/forums/showpos...0&postcount=15

Here is a great weight savings thread too that might be helpful:

http://www.m3post.com/forums/showthread.php?t=135122

1M Diet Plan:
Power seats:
~15lbs
NAV:
~12lbs
Ehanced Audio:
~20lbs
Wiper Fluid:
~8.35lbs
Battery:
~30lbs Braille
Carbon Fiber Roof:
~14.0lbs IND
Exhaust:

Hood:
~28lbs iCarbon DS CF
Trunk:
~23.3lbs iCarbon DS CF
Mobilty Kit & Holder:
~3.02 lbs
Rear Headrests:
1.73 lbs
Trunk Floor Cover/Mat:
8.26 lbs
Trunk Lid Lining:
2.07 lbs
Front Plate+Holder:
0.83 lbs

[mPlasticDesign]

OEM Factory OPTIONS:
Only 3 options that you can eliminate to reduce weight.
Power seats: ~15lbs
NAV: ~12lbs
Ehanced Audio: ~20lbs
TOTAL: ~47lbs

Fluids:
Wiper:
~8.35lbs
Fuel: 90% fuel tank:
~90lbs


Wheels:
Sticky Wheel Weight Comparison:
http://www.m3post.com/forums/showthr...k+wheel+weight

OEM 1M Weight: Front=26lbs, Rear=26.8lbs, (19x9 +31 and 19x10 +25)





Battery:
53lbs = OEM BMW lead acid battery
23lbs = HP Autowerks battery tray + Braille battery
~30lbs
or
OEM Mini battery: 34.4 lbs -- 55 Amp/Hr
Cost: $128
~18.6lbs

Hood:
OEM Hood - 44 lbs
-iCarbon single sided CF hood - 21 lbs ~23lbs
-iCarbon double sided cf hood - 16 lbs ~28lbs

Trunk:
OEM Trunk - 33 lbs
-iCarbon single sided CF trunk - 13 lbs ~20lbs
-iCarbon double sided CF trunk - 9.7 lbs ~23.3lbs

Exhaust:
OEM Exhaust(FULL) 77.16lbs
OEM Muffler only ??? lbs

Meisterschaft: 16lbs(9lbs for the Ti)~??lbs
http://www.1addicts.com/forums/showthread.php?t=549402

Eisenmann: 29.6lbs(muffler section weight only), ~??lbs
http://www.ind-distribution.com/prod...55&no=291&Opt=

Mobilty Kit & Holder:
Removal: ~3.02 lbs

Rear Headrests:
Removal: 1.73 lbs

Trunk Floor Cover/Mat:
Removal: 8.26 lbs

Trunk Lid Lining:
Removal: 2.07 lbs

Front Plate+Holder:
Removal: 0.83 lbs

[sq86]

You forgot the driver... lol

Some people may need to go on a diet!!

I could lose another 15 lbs.

[M3 Adjuster]

love this... Can you add the measurements of the stock wheels along with their weights?

[Texas F1]

Great thread! Glad I've ordered mine w/o optional packages. These really do add up quickly.

[FJS]

[r.c.y.k.]

Wouldn't 1m have the same battery as 135i? Which is 53lbs instead of 60lbs.
http://www.1addicts.com/forums/showt...battery+weight

[mPlasticDesign]

Originally Posted by M3 Adjuster

love this... Can you add the measurements of the stock wheels along with their weights?

done

Originally Posted by r.c.y.k.

Wouldn't 1m have the same battery as 135i? Which is 53lbs instead of 60lbs.
http://www.1addicts.com/forums/showt...battery+weight

Thanks. Fixed. I also included the specs on an OEM Mini battery for those that don't want to go the Braille route and less expensive as well.

[Moo]

Does anyone know which lightweight front bucket seats will fit? Along with taking out the rear seats & battery swap = probably amongst the most cost-effective weightloss plan.

[r.c.y.k.]

The thread would help;
http://www.1addicts.com/forums/showt...battery+weight

[EmmDrei]

Hi Metak,

ther's a short list where a guy modded his 1M. Lists the stock weights (in kg):



I'll translate:

Complete front wheel: 21,8kg
Complete rear wheel: 23,3kg

(Someone could compare the weights to those measured above, to find out how accurate this list is)

Brake disc front: 10,6kg
Brake disc rear: 9,5kg
Front caliper w. pad: 7,2kg
Rear caliper w. pad: 5,6kg

Then it has "total brake" (32,9kg) and "total wheel" (45,1kg) where I am not sure exactly what he threw together to come up with that figure.

Total unsprung mass: 78kg

"Fahrwerk" (shocks, springs and everything to mount the stuff) complete: 32kg

Seats driver/passenger: 68kg (he lists the performance seats he has in the car at 42kg together)

Exhaust system: 35kg

Then he has a "stock total" and a "modded total" and thus calculates the weight he has saved (70kg).


This btw is the original source: Link.

[Gtrain]

This list is awesome.

[Aussie_in_London]

Originally Posted by EmmDrei

Seats driver/passenger: 68kg (he lists the performance seats he has in the car at 42kg together)

those performance seats are still not that light at all

you could get down under half that again with ABR pole positions including side mounts and runners, and much cheaper with more lateral support, even a complete re-upholster (half leather, half alcantara) to match the interior finish would be the lightest and cheapest option, hmmm might look into that.......

[GoingTooFast]

Originally Posted by EmmDrei

I'll translate:

Complete front wheel: 21,8kg
Complete rear wheel: 23,3kg

(Someone could compare the weights to those measured above, to find out how accurate this list is)

Brake disc front: 10,6kg
Brake disc rear: 9,5kg
Front caliper w. pad: 7,2kg
Rear caliper w. pad: 5,6kg

Then it has "total brake" (32,9kg) and "total wheel" (45,1kg) where I am not sure exactly what he threw together to come up with that figure.

'Complete wheel' = rim + tire

'complete front wheel' = 26,0lbs + 24,0lbs (PS2 245/35/19)* = 11,8kg + 10,9kg = 22,7kg (List -> 21,8kg)

'complete rear wheel' = 26,8lbs + 25,0lbs (PS2 265/35/19)* = 12,2kg + 11,3kg = 23,5kg (List -> 23,3kg)

The list can be considered accurate, there's only ~1kg difference in the 'complete front wheel' weight!


One side (left or right):

'Total wheel' = 'complete front wheel' (21,8kg) + 'complete rear wheel' (23,3kg) = 45,1kg

'Total unsprung mass' = 'Total brake' (32,9kg) + 'Total wheel' (45,1kg) = 78kg


Both sides (left and right):

'Total unsprung mass' = 2 x 'Total brake' (32,9kg) + 2 x 'Total wheel' (45,1kg) = 65,8kg + 90,2kg = 156kg



*PS2 Tires weight

[szcyxzh]

Where is carbon fiber? Great thread! Thanks.

[Dan Parker]

Removing the back seats isn't going to net much weight loss. I bet they don't weigh 10 lbs. I love the stock wheels but that is a ton of unsprung weight! Good thread, subscribed.

[GoingTooFast]

From the 70,3kg he could save in total, 36,4% corresponds to the unsprung mass - 156,0kg down to 130,4kg = 25,6kg - which is quite good because the higher the unsprung mass, the higher the force exerted on the spring of the suspension and the higher the force required to keep the wheel planted to the ground and this is what affects handling and traction. The unsprung mass also has an effect on the vehicle’s acceleration and deceleration mainly because of the rotational inertia - the heavier the wheel (and also larger in diameter the wheel), the more energy required to spin that mass up under acceleration and to spin that mass down under braking.

[Mahlzeit]

Originally Posted by Dan Parker

Removing the back seats isn't going to net much weight loss. I bet they don't weigh 10 lbs. I love the stock wheels but that is a ton of unsprung weight! Good thread, subscribed.

If if the 1M is anything like my e36, in which the folding rear seat backs we freakin' heavy, then removing them should be significant. My e36's rear seat bottom cushion indeed felt 'light'.

Would be great if a 1M owner w/ time and energy could remove and weigh their folding rear seat back.

Side Bar: What about balance? Removing the rear seats + adding a light weight battery could remove like ~40 lbs,...but from the rear axle of the car. Seats, wheels, nav, upgraded stereo seems to remove weight in a more balanced way. Once I took out the rear seats, the spare, and the trunk lining in my e36 - I did feel I needed to be a bit more careful in certain driving situations.

[Moo]

Originally Posted by Mahlzeit

If if the 1M is anything like my e36, in which the folding rear seat backs we freakin' heavy, then I removing them should be significant. My e36's rear seat bottom cushion indeed felt 'light'.

Would be great if a 1M owner w/ time and energy could remove and weigh their folding rear seat back.

Side Bar: What about balance? Removing the rear seats + adding a light weight battery could remove like ~40 lbs,...but from the rear axle of the car. Seats, wheels, nav, upgraded stereo seems to remove weight in a more balanced way. Once I took out the rear seats, the spare, and the trunk lining in my e36 - I did feel I needed to be a bit more careful in certain driving situations.

From this thread, the changing/deleting seats can be fairly significant.

Seats:
-Front Sport Seats (non power) - 54 lbs EACH
-Rear Seat Removal including rear floor mats - 55 lbs

54x2 (front seats) + 55 (back seat) = 163 - 20x2 (front seat replacement) = 123 lbs reduced

Replace OEM with braille battery = 32 lbs reduced

That's -155 lbs (-5% tw) right there! How's that for a ghetto CSL mod?

[Mahlzeit]

On rear seat removal: see this thread, he also built a panel to cover the hole.

They claim 60 lbs of savings, but I didn't see any pictures of anything on a scale.

Anyway - pre track day flight check: change pads, top up oil, adjust your coil-overs and camber plates, and take out your back seat. Ready to go in ~1 hr?

[mPlasticDesign]

Couple of questions:

1. Does BMWNA listed Unladen Weight of 3362lbs include all available options? I I know it is a "without passenger/cargo" figure. Also think it is without fuel, but am not certain.

2. Anyone know what the OEM axle back section of the exhaust weight is?

[TunedM2C]

Originally Posted by ///Metak

Couple of questions:

1. Does BMWNA listed Unladen Weight of 3362lbs include all available options? I I know it is a "without passenger/cargo" figure. Also think it is without fuel, but am not certain.

2. Anyone know what the OEM axle back section of the exhaust weight is?

I'll be doing an exhaust weight comparison next week.