[specracer]

Not sure if anyone has done this or not, but I was curious. What does an M2 CS weigh? Well my guess was 3400. I was a bit light. This is a car as delivered, with rubber (vs carpet) floor mats, and between 3/4 and 7/8 full of fuel. Surprisingly good left to right corner weights.

Full fuel, Id guess just over 3500.

EDIT, car has iron brakes.

[Moflow]

Great for reference, thank you! Curb weights are often wrong, great to see real world results on a scale.

I see you’re a MT car. Sunroof? Carbon ceramics?

[specracer]

Sunroof is not an option on a CS, but yes MT, and I just edited, to add that the car has iron rotors.

Originally Posted by Moflow

Great for reference, thank you! Curb weights are often wrong, great to see real world results on a scale.

I see you’re a MT car. Sunroof? Carbon ceramics?

[ptgltw]

Not terrible. What's the lightest BMW built?

[specracer]

Isetta would be my guess, not including motorcycles (said with humor, as Im guessing you are referring to current models). Current I bet the inspiring i3

Originally Posted by ptgltw

Not terrible. What's the lightest BMW built?

[Moflow]

Originally Posted by specracer

Sunroof is not an option on a CS, but yes MT, and I just edited, to add that the car has iron rotors.

Oh yeah, obviously! Whoops. Thanks for clarifying on the rotors though!

[ScullyD]

Originally Posted by Moflow

Oh yeah, obviously! Whoops. Thanks for clarifying on the rotors though!

How much weight in total is the CCBs supposed to save over the Steel rotors?

[Acetech]

55 pounds

[f80_MG]

Originally Posted by specracer

Not sure if anyone has done this or not, but I was curious. What does an M2 CS weigh? Well my guess was 3400. I was a bit light. This is a car as delivered, with rubber (vs carpet) floor mats, and between 3/4 and 7/8 full of fuel. Surprisingly good left to right corner weights.

Full fuel, Id guess just over 3500.

EDIT, car has iron brakes.

Cool, thank you.

So BMW's weight of 3417 was pretty accurate then. Pretty healthy 183 lb difference with a similarly spec'd M2C in that case.
Subtract 55 for CCBs
and 20-30 lbs for lightweight exhausts.

Lovely!

[medphysdave]

Originally Posted by f80_MG

Cool, thank you.

So BMW's weight of 3417 was pretty accurate then. Pretty healthy 183 lb difference with a similarly spec'd M2C in that case.
Subtract 55 for CCBs
and 20-30 lbs for lightweight exhausts.

Lovely!

Another 40lbs conservatively for lightweight battery.

[dgm3]

Originally Posted by f80_MG

Cool, thank you.

So BMW's weight of 3417 was pretty accurate then. Pretty healthy 183 lb difference with a similarly spec'd M2C in that case.
Subtract 55 for CCBs
and 20-30 lbs for lightweight exhausts.

Lovely!

For the M2C there is a massive difference between the US official weight (3600) and the DIN weight (3417). Main reason is that in Europe the base M2C has a much lower equipment : no Msport seat, no electrical seats, no HK, blue brakes,...

Guess the M2CS are pretty much similarly equipped in the US and Europe, therefore weights should be closer. Is there an official US weight for the M2CS ?

[Hedoniste]

Originally Posted by medphysdave

Another 40lbs conservatively for lightweight battery.

Doesn't it have the lithium one like the F80?

[medphysdave]

Originally Posted by Hedoniste

Doesn't it have the lithium one like the F80?

Nope. It might have the largest car battery I've ever seen. Someone once referenced a 60lb savings by going to a lithium battery, but I didn't think that could be right. I thought it might with 60lbs total

There's quite a bit of easy weight to pull from the car without impacting usability, but it's expensive. The battery being the least of it. Brakes and exhaust as previously mentioned are the other low hanging fruit. Carbon rotors or AP racing kit for brakes. Titanium or inconel exhaust.

I was going to do a lightweight battery, but decided against as long as I'm hauling child seats in the back.

I did question whether there was rhyme and/or reason for the heavy battery. The car balance from above is pretty good. The battery is offset to the left in the trunk.

[M2C_PLUS]

Originally Posted by specracer

Not sure if anyone has done this or not, but I was curious. What does an M2 CS weigh? Well my guess was 3400. I was a bit light. This is a car as delivered, with rubber (vs carpet) floor mats, and between 3/4 and 7/8 full of fuel. Surprisingly good left to right corner weights.

Full fuel, Id guess just over 3500.

EDIT, car has iron brakes.

Thanks for posting.

Interesting.

FYI.....my UK spec M2Comp DCT with grey big brake kit, full tank, M perf coilovers, stock 788 wheels and manual seats is 3560lbs.

Corner weight image shows me sat in the car at 127kg. The 3560lbs figure I mention above is without me in the car. 👍🏼

I have since added 763m's with Cup 2's and that dropped 2.4kg off each corner compared to running 788's with MPSS.

[f80_MG]

Originally Posted by medphysdave

Nope. It might have the largest car battery I've ever seen. Someone once referenced a 60lb savings by going to a lithium battery, but I didn't think that could be right. I thought it might with 60lbs total

There's quite a bit of easy weight to pull from the car without impacting usability, but it's expensive. The battery being the least of it. Brakes and exhaust as previously mentioned are the other low hanging fruit. Carbon rotors or AP racing kit for brakes. Titanium or inconel exhaust.

I was going to do a lightweight battery, but decided against as long as I'm hauling child seats in the back.

I did question whether there was rhyme and/or reason for the heavy battery. The car balance from above is pretty good. The battery is offset to the left in the trunk.

True, the F/R seems similar to the comp at 52.xx % / 47.xx %
A -40-50 lb battery would take that to 54/46 (shouldn't mess with the L-R distribution in the rear too much even though the battery is offset.)
Would that distribution bias cause any problems/mess with the dynamics?

[medphysdave]

Originally Posted by f80_MG

True, the F/R seems similar to the comp at 52.xx % / 47.xx %
A -40-50 lb battery would take that to 54/46 (shouldn't mess with the L-R distribution in the rear too much even though the battery is offset.)
Would that distribution bias cause any problems/mess with the dynamics?

Probably not that I could tell. If tracking the car it could probably remedied with tire pressure.

You've started down an interesting road. I imagine that most of the weight savings for an exhaust is the muffler part? Replacement would further move the bias towards the front. Weight that is reasonably centered and at the very bottom of the car likely doesn't contribute negatively to the driving characteristics beyond acceleration and braking.

I think the battery decision was performance based for balance. It would have been easy to add lithium battery and sell it as a weight saving measure. $/kg is much less than the other options.

[maxxfish]

Man, I wish the CS had manual seats. Less weight and complexity, faster to adjust than electric, and how often do you really need to make adjustments? I'm just jealous of the Porsche carbon buckets!

[ptgltw]

Originally Posted by maxxfish

Man, I wish the CS had manual seats. Less weight and complexity, faster to adjust than electric, and how often do you really need to make adjustments? I'm just jealous of the Porsche carbon buckets!

Don’t be jealous of Porsche Carbon seats they come with cars $110k plus. However don’t the new m3/4 come with a carbon fiber seat option? In a perfect world if would have been nice to have an interior option such as cf seats. With that said the CS seats are amazing. We spent 7 hours in the car and not one back ache or complaint from me or my son. Contradictory to the M2C seats which for me would discomfort after 5-10 min. Bmw really stepped it up in the seat game for the CS but you know they weigh a tonnage.

But as for manual seats you can’t code them to open all the way when you for ease of entry. As it is now, with my preferred driving position, I brush the steering wheel a little with my torso as I enter

I have been eyeing the GTS seats. Those look amazing but are so damn expensive. Wonder if they are comfy.

[Davil]

Originally Posted by ptgltw

That said the CS seats are amazing. We spent 7 hours in the car and not one back ache or complaint from me or my son. Contradictory to the M2C seats which for me would discomfort after 5-10 min. Bmw really stepped it up in the seat game for the CS but you know they weigh a tonnage.

Yes, with you here. Power seats are very useful with the memory.

They do feel lighter than the M2C seats just when you move them. You sit quite a bit lower and the leather is much, much nicer too. I'm not convinced they are more comfortable yet though as they are a lot less padded. They certainly grip well. The M2C seats were incredibly comfortable for me. I have a long drive planned this coming weekend so time will tell. Seat comfort is very personal though.

[specracer]

I was looking at the battery, and as commented by others, I was really surprised how large it is. I want to pull it and weigh it, but I have not been able to get a state inspection yet, so I do not want to clear the emissions monitor status, until I do (we got snow yesterday so roads will be a mess for a while). Its location is much better than our outgoing F80M3 (drivers right back corner behind rear wheel, but F80 was a "light weight" battery)

[CSBM5]

Originally Posted by specracer

I was looking at the battery, and as commented by others, I was really surprised how large it is. I want to pull it and weigh it, but I have not been able to get a state inspection yet, so I do not want to clear the emissions monitor status, until I do (we got snow yesterday so roads will be a mess for a while). Its location is much better than our outgoing F80M3 (drivers right back corner behind rear wheel, but F80 was a "light weight" battery)

The Li Battery in the F80 was "the" single biggest contributor to it's weight loss versus the E90. 30.9 lbs saved in just the battery...see link comparing them. The BMW battery is pretty expensive (BMWNA MSRP $1885).

An Antigravity 60Ah battery is about 18 lbs so another 13 lbs lighter than the F80 one and about 1/2 the cost. I would assume the battery in the M2C/CS is about 60lbs, so this would save a bit more than 40lbs.

[Bimmed Out]

Originally Posted by Moflow

Sunroof?