M3 Weight Data Thread

[heinzboehmer]

Thought it would be good to have a thread were we can keep track of what certain parts on the car weigh. I'll start with what I got from the rear seats. Post up the things you've weighed and I'll update this post.

Interior

Front Seats

Front seat (black nappa/power/heat/latch): 51.5 lbs
Front seat (m texture/power/bolster/lumbar/rails): ~65 lbs
Door card (black nappa, no speaker, no trim): 8.2 lbs

Rear Seats

Bottom cushion (black nappa): 12.8 lbs
Larger seat back (black nappa): 23.3 lbs
Smaller seat back (black nappa): 12.0 lbs
Lateral finisher panel (black nappa): 2.0 lbs
Headrest (single): 1 lbs
Door card (black nappa, speaker, no trim): 4.8 lbs
Sound deadening rubber below rear seat cushion/over fuel pumps: ~5 lbs

Carpet

Front section: 16 lbs
Rear section: 10 lbs

Audio

Nav head unit: 6.2 lbs
2x front tweeter/mid + 2x front woofer: 3 lbs
2x rear side speaker + 2x rear deck speaker: 3 lbs
Rear deck speakers (single): 2.25 lbs
Rear subwoofer assembly: 7.5 lbs
BM53/IBUS/GPSDVD/HK amp/mounting bracket: 15.5 lbs
Complete nav audio wiring harness: 11 lbs

Misc

Arm rest: 4.8 lbs
Roof liner (hole for sunroof): 3.5 lbs
Sunroof glass: 14 lbs
Sunroof cassette: 16.5 lbs
Lights, pillars, sun visors, rubber seam for sunroof glass, oh shit handles, clothes hooks: 8lbs

Exterior

Sunroof roof panel (just the metal skin): 22.5 lbs
Fog light (single): 1 lbs
Roof rack (with bike bar): 15 lbs

Engine Bay

Fan clutch and plastic blades: 4 lbs
Cabin air filter housing with filter: 6.5 lbs
Cabin air filter block plate on firewall: 4 lbs
Stock manual intake manifold with boots (no intake elbow or filter box): 8.4 lbs

Exhaust

Headers (US): 18.5 lbs

Section 1: 14 lbs

Section 2: 20.5 lbs
Muffler: 53.15 lbs

Trunk

Rear sub with sub amp assembly: 7.5 lbs
Trunk lid panel and tool kit: 4 lbs
2x trunk inside lights: negligible
Telematics tme unit and entire metal frame: 7.5 lbs
Mobility kit with Styrofoam holder: 8.6 lbs

Mobility kit tire sealant:1.6 lbs

Misc

MK20 hardware: 25.10 lbs
MK60 hardware: 14.55 lbs

Aftermarket

SSV1: 15.5 lbs
SS section 1 with race cats: 18 lbs
SS oversized resonated section 2: 23.5 lbs
Dinan Muffler: 44.05 lbs
Megan racing headers: 14.4 lbs
SPAL 2082 electric fan: 6.2 lbs.
Front suspension, stock - Bilstein b16 strut, spring, spring pads, bearing, mount, and bump stop (both sides): 30.6 lbs.
Rear suspension, stock - Bilstein b16 rear struts, springs, spring pads, mounts, and bump stops (both sides): 23.8 lbs.
Turner CSL intake (bare, w/o boots and filter): 6.2 lbs.
Turner silicon intake boots and worm clamps: 1.2 lbs.
Cobra Nogaro Circuit (m texture/brey krause mounts/manual lever/oem manual seat rails): ~34 lbs

Slon CF roof bow: 443 g (0.977 lbs)

[heinzboehmer]

Here's pictures of the scale with the rear seats. Weighed them both by carefully balancing them on the scale and by weighing myself plus the part. Weights fluctuated +-0.1 lbs between both methods.

Lower. 12.8 lbs:



Small upper. 12.0 lbs:



Large upper. 23.3 lbs:



Total 48.1 lbs.

[mrgizmo04]

You can paste everything from my post. If you need pics of everything as proof, that might be tougher.

Alternative is to use the realoem site to look up individual part numbers where the output provides the weight in kg.

Things I measured firsthand myself (weighting myself vs weighting myself + part):
Rear sub with sub amp assembly 7.5lbs
Telematics tme unit and entire metal frame 7.5lbs
Rear seat cushion 13.5lbs
Both rear headrests (together not each) 2lbs
Both rear deck speakers (together not each) 4.5lbs
Both rear seat backs 34.5lbs (larger driver side 22.5lbs, smaller pass side 12lbs)
Fan clutch and plastic blades 4lbs
Cabin air filter housing with filter 6.5lbs
Fog lights (together) 2lbs
Trunk lid panel and tool kit 4lbs
Roof rack (with bike bar) 15lbs
2x trunk inside lights - negligible
Cabin air filter block plate on firewall 4lbs
Roof liner (hole for sunroof) 3.5lbs
Lights, pillars, sun visors, rubber seam for sunroof glass, oh shit handles, clothes hooks 8lbs
Sunroof glass 14lbs
Sunroof cassette 16.5lbs
Sound deadening rubber below rear seat cushion/over fuel pumps ~5lbs

From friend's memory:
Cabin carpet 26lbs total. 16lbs front section, 10lbs rear section.

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[BigRussia]

Sunroof glass 14lbs
Sunroof cassette 16.5lbs

Damn I thought the complete sunroof assembly including glass and cassette would be closer to 60+ lbs. Kinda disappointing the glass is only that much, thought for sure it'd be heavier as I was planning to do the CF sunroof delete in the near future. Guess its not really worth the effort then for only ~30lb reduction (though I know it has other benefits, since its at the highest COG).

I want to weigh my power/lumber/adjustable bolster front seats, but it will be without the bottom power sliders, so purely seat weight. Just don't have a scale big enough to put them on and they are waaayyy too bulky and heavy for me to hold that long to step on a scale ha.

[mrgizmo04]

Damn I thought the complete sunroof assembly including glass and cassette would be closer to 60+ lbs. Kinda disappointing the glass is only that much, thought for sure it'd be heavier as I was planning to do the CF sunroof delete in the near future. Guess its not really worth the effort then for only ~30lb reduction (though I know it has other benefits, since its at the highest COG).

I want to weigh my power/lumber/adjustable bolster front seats, but it will be without the bottom power sliders, so purely seat weight. Just don't have a scale big enough to put them on and they are waaayyy too bulky and heavy for me to hold that long to step on a scale ha.

Yeah I kept hearing 60-70lbs, which seemed ridiculous. I dont know if there is something different on non-m e46 to deem that inflated number more "true".

But even with sunroof motor, sun visors, dome lights, etc you dont net more than about 35-40lbs. Still, like you said, farthest from cg. Roof, from what I gathered, might be another ~10lbs, for more carbon $.

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[Epsilon]

According to Lang, you're saving 52 lbs with a carbon roof.

https://store.langracing.com/bmw-e46-coupe-carbon-fiber-roof-panel/

[FBloggs]

Black Nappa leather:
Front seat(power/heat/latch)...51.5lb
Door card(no speaker,no trim)...8.2 lb
Rear Door card w/speaker,no trim...4.8 lb
Rear seat lateral finisher panel...2.0 lb

[BigRussia]

According to Lang, you're saving 52 lbs with a carbon roof.

https://store.langracing.com/bmw-e46...er-roof-panel/

Yeah, I didn't think the rest of the steel roof would weight that much. I had figured most of the weight was in the sunroof glass panel. BTW I was speaking of doing just a CF sunroof delete panel, that only replaces the sunroof and leaves the factory roof. Was not talking about doing a full CSL style CF roof conversion (too much money and effort to be worth it on my high mileage not-minty car)

[mrgizmo04]

Some exhaust weights. Net, you are gaining a few lbs going from stock to SS.

SSv1 15.5 lbs
SS race cats 18 lbs
SS oversized res s2 23.5 lbs

Stock headers 18.5 lbs
Stock s1 14 lbs
Stock s2 20.5 lbs

I don't have the stock muffler and am not planning on dropping my SS sport for measurement any time soon, so don't have those numbers.


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[Inizes]

Some exhaust weights. Net, you are gaining a few lbs going from stock to SS.

SSv1 15.5 lbs
SS race cats 18 lbs
SS oversized res s2 23.5 lbs

Stock headers 18.5 lbs
Stock s1 14 lbs
Stock s2 20.5 lbs

I don't have the stock muffler and am not planning on dropping my SS sport for measurement any time soon, so don't have those numbers.


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I just put my stock muffler up in the rafters of my garage. I really don’t want to pull it down to get the weight. I’ve heard it’s around 60 lbs.

[mrgizmo04]

I just put my stock muffler up in the rafters of my garage. I really don’t want to pull it down to get the weight. I’ve heard it’s around 60 lbs.

If we trust realoem, it's 24kg, 53lbs.


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[Anders93]

Error bars are probably around +/- 0.4 lbs.

Megan racing headers: 14.4 lbs.
Mobility kit with Styrofoam holder: 8.6 lbs.
Arm rest: 4.8 lbs.
SPAL 2082 electric fan: 6.2 lbs.
Front suspension, stock - Bilstein b6 strut, spring, spring pads, bearing, mount, and bump stop (both sides): 30.6 lbs.
Rear suspension, stock - Bilstein b6 rear struts, springs, spring pads, mounts, and bump stops (both sides): 23.8 lbs.
Stock manual intake manifold with boots (no intake elbow or filter box): 8.4 lbs.
Turner CSL intake (bare, w/o boots and filter): 6.2 lbs.
Turner silicon intake boots and worm clamps: 1.2 lbs.

[Tbonem3]

If we trust realoem, it's 24kg, 53lbs.


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That's without tips & rivets I think it's 58lbs total

Edit: wrong

[slavik1988]

Since I am doing a Mk60 conversion...



For all of the Mk20 guys, you save 10.55 lbs in hardware by going to a better ABS system. 🙂

Mk20:


Mk60:

[slavik1988]

For all that are wondering the weight of the stock and a Dinan exhaust...


Stock:


Dinan: