Street Faction Engineering E46M3 Rear Seat Delete

[STAATS]

Ya I'm just looking for a fixed back, no deck or lower portion, but $400 no thanks. Hard motorsport's is $210 and is alu.

http://www.hardmotorsport.com/hard-m...-filler-panel/

Yer agreed if you only want the back portion the HARD Motorsport option is way better. I am interested in tidying it all up so want bottom panel as well and I like that the Street Faction Engineering kit is made from actual 3D scans so its going to be as close to what an OEM option / piece might have been vs building off a template but yer the price point is INSANE, I have queried where the price comes from... I mean when its Steel the back is $275USD vs HARD Motorsport $210... that's a little more in touch with reality... I do not see Aluminium adding $125USD

[mrgizmo04]

Rear seat cushion is about 13.5lbs.
Driver side seat back is about 22.5lbs.
Pass side seat back is about 12lbs.

I just installed CF sunroof panel and removed/weighed a lot of random pieces.

If of interest, all in lbs (this is prob +/- 1 lb because my scale is not super accurate and to get all the weights I had to weigh myself with/without holding the pieces):

-Rear sub with sub amp assembly 7.5
-Telematics tme unit and entire metal frame driverside in trunk 7.5
-Rear seat cushion 13.5
-Both rear headrests (together not each) 2
-Both rear deck speakers (together not each) 4.5
-Both rear seat backs 34.5 (larger driver side 22.5, smaller pass side 12)
-Fan clutch and plastic blades 4
-Cabin air filter housing with filter 6.5
-Fog lights (together) 2
-Trunk lid panel and tool kit 4
-Roof rack (with bike bar) 15
-2x trunk inside lights - negligible
-Cabin air filter vertical block plate on firewall 4lbs
-Roof liner 3.5lbs
-Prep for roof liner to come out - lights, a/c pillars, sun visors, rubber seam for sunroof glass, oh shit handles, clothes hooks, 8lbs
-Sunroof glass 14
-Sunroof cassette 16.5

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[STAATS]

Rear seat cushion is about 13.5lbs.
Driver side seat back is about 22.5lbs.
Pass side seat back is about 12lbs.
Both rear headrests (together not each) 2

All the above =50lbs so that checks out to what I had as i remember I didn't remove or weigh the seatbelts, pass through latches or the rubber mat under the seat cushion so in my head I was like 50lbs reduction minimum + some extra when I nix the other bits and I left the weight of the seatbelts and rubber mat as margin of error for any weight I might add back

So getting the Aluminium RSD from Street Faction is a ~26.5lbs reduction minimum potentially up to 30lbs which isn't bad.

I have to remove my rear seat belts and re-register as a 2-seater when I eventually get Cobra Nogaros, due to local regulations so a RSD is a no brainer for me... the reason to go with HARD Motorsport or Street Faction is due to motorsport regs as I'm sure it will need to be considered a firewall with my Radium Auto FST install... so meeting regs and dropping ~30lbs is pretty appealing... but the $500USD for Aluminium kit doesn't ass up

[mrgizmo04]

All the above =50lbs so that checks out to what I had as i remember I didn't remove or weigh the seatbelts, pass through latches or the rubber mat under the seat cushion so in my head I was like 50lbs reduction minimum + some extra when I nix the other bits and I left the weight of the seatbelts and rubber mat as margin of error for any weight I might add back

So getting the Aluminium RSD from Street Faction is a ~26.5lbs reduction minimum potentially up to 30lbs which isn't bad.

I have to remove my rear seat belts and re-register as a 2-seater when I eventually get Cobra Nogaros, due to local regulations so a RSD is a no brainer for me... the reason to go with HARD Motorsport or Street Faction is due to motorsport regs as I'm sure it will need to be considered a firewall with my Radium Auto FST install... so meeting regs and dropping ~30lbs is pretty appealing... but the $500USD for Aluminium kit doesn't ass up

Yeah price is steep. In my case I also need something sturdy (just for the seat back replacement) to haul the baby in the baby seat around. So I might be out for this one and I don't have plans for a half cage yet (per baby comment).

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[Tbonem3]

Rear seat cushion is about 13.5lbs.
Driver side seat back is about 22.5lbs. Pass side seat back is about 12lbs.
If of interest, all in lbs (this is prob +/- 1 lb because my scale is not super accurate and to get all the weights I had to weigh myself with/without holding the pieces):

-Rear sub with sub amp assembly 7.5
-Telematics tme unit and entire metal frame driverside in trunk 7.5
-Rear seat cushion 13.5
-Both rear headrests (together not each) 2
-Both rear deck speakers (together not each) 4.5
-Both rear seat backs 34.5 (larger driver side 22.5, smaller pass side 12)
-Fan clutch and plastic blades 4
-Cabin air filter housing with filter 6.5
-Fog lights (together) 2
-Trunk lid panel and tool kit 4
-Roof rack (with bike bar) 15
-2x trunk inside lights - negligible
-Cabin air filter vertical block plate on firewall 4lbs
-Roof liner 3.5lbs
-Prep for roof liner to come out - lights, a/c pillars, sun visors, rubber seam for sunroof glass, oh shit handles, clothes hooks, 8lbs
-Sunroof glass 14
-Sunroof cassette 16.5

Very helpful in my weight loss documentation, thanks!

[mrgizmo04]

Very helpful in my weight loss documentation, thanks!

I'll prob start a thread would be useful. I have other parts of the car that I can weigh too.

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[Obioban]

Rear seat cushion is about 13.5lbs.

That seems, intuitively, so wrong! It feels like it weighs 3-4 lbs.

[mrgizmo04]

That seems, intuitively, so wrong! It feels like it weighs 3-4 lbs.

You are just too buff so it feels light .

Def surprising.

Realoem lists the foam cushion at ~4.4kg and upholstery at ~1kg (search individual part number).

https://www.realoem.com/bmw/enUS/showparts?id=BL93-USA-07-2005-E46-BMW-M3&diagId=52_2730

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[Tbonem3]

That seems, intuitively, so wrong! It feels like it weighs 3-4 lbs.

Agreed. I think its size plays a factor in that perception.

[Obioban]

Agreed. I think its size plays a factor in that perception.

I suppose it must.

On the flip side, the front seats (also large) feel like they weight 120 lbs (actually ~58), when in reality they're apparently only ~4x the weight of the back seat lower cushion.

[Toby22]

That seems, intuitively, so wrong! It feels like it weighs 3-4 lbs.

Lol yea wtf. I’ve removed the rear seats many times and I can toss them around like nothing. Then almost kill myself with a stock muffler lol. Guess the density of the muffler made it seem that much heavier.

But hey, this is good news I guess. More weight savings to be had!

[Obioban]

Lol yea wtf. I’ve removed the rear seats many times and I can toss them around like nothing. Then almost kill myself with a stock muffler lol. Guess the density of the muffler made it seem that much heavier.

But hey, this is good news I guess. More weight savings to be had!

I'm going to stick it on a scale next time I have it out for something else.

[clawhamm3r]

Also confirming the rear seat is heavier than it looks. From my recent tear down:



I've got an unused Hard Motorsport rear seat delete I decided not to use that I need to sell if someone wants to save some money haha.

[Obioban]

^picture isn’t loading

[timmo]

Lol, yeah that rear seat bottom feels like it weighs nothing. Conversely, the rear seat backs feel like they weigh a ton... anyone got a number on that?