[M-Pilot]

While making some comparisons on CF vs steel roof/hood, I found some interesting info and wanted to share it here. I also have a question about the weight of the steel roof on the M2.

- M2C has a different part number (41008073538) for the hood than OG M2 (41007373899)

- Steel hood on the OG M2 weighs 17.5kg (No weight info on the M2C hood but should be the same)

- M Performance CF Hood for M2 weighs 9kg while M Performance CF hood for M4 CS/GTS weighs 7.5kg. More interestingly, Edison Composites CF Hood by IND weighs 6.5kg (IMO looks better too).

- The stock steel roof weighs 14.4kg or 31.7lbs. RKP CF roof weighs only 7.5lbs according to IND's product description. I thought CF roof only saved around 10-12lbs. Do you guys think there is a typo on either weight figure?

[MR.]

Interested in this... I cannot answer it but I will definitely follow this.

MR

[FSU_Logan]

Originally Posted by cntzl

While making some comparisons on CF vs steel roof/hood, I found some interesting info and wanted to share it here. I also have a question about the weight of the steel roof on the M2.

- M2C has a different part number (41008073538) for the hood than OG M2 (41007373899)

- Steel hood on the OG M2 weighs 17.5kg (No weight info on the M2C hood but should be the same)

- M Performance CF Hood for M2 weighs 9kg while M Performance CF hood for M4 CS/GTS weighs 7.5kg. More interestingly, Edison Composites CF Hood by IND weighs 6.5kg (IMO looks better too).

- The stock steel roof weighs 14.4kg or 31.7lbs. RKP CF roof weighs only 7.5lbs according to IND's product description. I thought CF roof only saved around 10-12lbs. Do you guys think there is a typo on either weight figure?

Damn, that IND hood is gorgeous. Unfortunate it is priced so high.

In regards to the weight, that is definitely a little funky. Guess we'll have to wait for comparisons.

The roof and hood can be a solid 40 lbs saved... with a new batter thats already 60 lbs. Can hit 100 lbs shed with wheels and a treadmill. Lol

[3tekcorps]

Originally Posted by FSU_Logan

Damn, that IND hood is gorgeous. Unfortunate it is priced so high.

In regards to the weight, that is definitely a little funky. Guess we'll have to wait for comparisons.

The roof and hood can be a solid 40 lbs saved... with a new batter thats already 60 lbs. Can hit 100 lbs shed with wheels and a treadmill. Lol

That 2% weight savings won't make a difference unless you're going pro.

Just accept that she's a little curvy. If you're looking for skinny this isn't your girl.

[F87_LCI]

https://www.motorsport24.de/en/m235i-f22-chassis/

This one is "only" EUR 1,890 (USD $2,200; CAD $2,800; AUD $3,025) that includes VAT, so if exporting outside EU do you have to pay it?? Not sure? If not, price is reduced by 19%!

I prefer the look of this one, but shipping must be a bitch from Germany.

Anyone know the weight on it?

[ChrisK]

Originally Posted by 3tekcorps

That 2% weight savings won't make a difference unless you're going pro.

Just accept that she's a little curvy. If you're looking for skinny this isn't your girl.

I lost 20lbs since I sold my M2. I don't need no stinkin hood.

[BishUK]

Dealer told me y'day both the roof and carbon fibre front wing panels wont be available until July 2019, so not worth stressing over just yet.

[FSU_Logan]

Originally Posted by 3tekcorps

That 2% weight savings won't make a difference unless you're going pro.

Just accept that she's a little curvy. If you're looking for skinny this isn't your girl.

100 lbs = 0.1 off 1/4 mi

[M-Pilot]

Even though the potential weight savings look like 10-20lbs here and there making not a huge difference, I still think that's how small stuff adds up. I respect others' decision to keep it as is but instead of paying BMW $90K+ for a relatively lighter M2 CS (possibly very limited as well), I'll try to build one for myself.

You can potentially save (without even touching the interior):
- 70+lbs unsprung weight by replacing wheels and brake kit alone
- 45+ lbs with CF hood and roof according to the info in the first post (most expensive item on the list for sure)
- 35lbs by replacing the oem battery with Antigravity RS30 lithium battery
- possibly 25+lbs with an aftermarket exhaust

All of these together cost significant amount of money and not sure if I'll go through each every possible upgrade (especially the CF hood and roof) I mentioned but I think it'll be fun project over the years.

[FSU_Logan]

Originally Posted by cntzl

Even though the potential weight savings look like 10-20lbs here and there making not a huge difference, I still think that's how small stuff adds up. I respect others' decision to keep it as is but instead of paying BMW $90K+ for a relatively lighter M2 CS (possibly very limited as well), I'll try to build one for myself.

You can potentially save (without even touching the interior):
- 70+lbs unsprung weight by replacing wheels and brake kit alone
- 45+ lbs with CF hood and roof according to the info in the first post (most expensive item on the list for sure)
- 35lbs by replacing the oem battery with Antigravity RS30 lithium battery
- possibly 25+lbs with an aftermarket exhaust

All of these together cost significant amount of money and not sure if I'll go through each every possible upgrade (especially the CF hood and roof) I mentioned but I think it'll be fun project over the years.

Unsprung weight , 1 lb = 3 lbs of unsprung weight equivalent

[DrKevM5]

I'm taking the plunge on the Armaspeed GTS Hood primarily for additional cooling. The weight saving is an added benefit.

[M-Pilot]

Originally Posted by FSU_Logan

Unsprung weight , 1 lb = 3 lbs of unsprung weight equivalent

I think 1-to-3 ratio only applies to rotational vs sprung weight but yes, in any case, 70+lbs unsprung weight reduction is not a typo and is a significant accomplishment IMO.

[RedCarrot]

I would seriously inquire how the aftermarket mfrs achieved the lighter weight. Did they use fewer layers of CF? Thinner layer of resin/dry carbon? Did they skip out the ultra expensive coating that keeps the CF from discoloration under the sun? Does it have structural bracing underneath a la MPerf? Is it cured in an autoclave? Most small mfrs don't have access to such size autoclave.

In my experience I have found only the most ultra high end brands are able to match the quality of OEM (or OEM-esque in the case of MPerf). Even Mugen of the world were not able to make CF parts that measure up to OEM standard. I am not saying those aforementioned hoods aren't bc I have zero experience with them. Just saying one should do their due diligence before committing big $$ on one.

[3tekcorps]

Originally Posted by FSU_Logan

100 lbs = 0.1 off 1/4 mi

I'll put my money on Hoosier over carbon.

[Saphirschwarz]

Originally Posted by F87_LCI

https://www.motorsport24.de/en/m235i-f22-chassis/

This one is "only" EUR 1,890 (USD $2,200; CAD $2,800; AUD $3,025) that includes VAT, so if exporting outside EU do you have to pay it?? Not sure? If not, price is reduced by 19%!

I prefer the look of this one, but shipping must be a bitch from Germany.

Anyone know the weight on it?

Wow i need more pics of that car ... nice find ! Love the trunklid

[FSU_Logan]

Originally Posted by 3tekcorps

I'll put my money on Hoosier over carbon.

DCT here so I'll run with some Mickey's.
Already in contact with Weld to see what they can do for me

[Karmic Man]

Originally Posted by RedCarrot

I would seriously inquire how the aftermarket mfrs achieved the lighter weight. Did they use fewer layers of CF? Thinner layer of resin/dry carbon? Did they skip out the ultra expensive coating that keeps the CF from discoloration under the sun? Does it have structural bracing underneath a la MPerf? Is it cured in an autoclave? Most small mfrs don't have access to such size autoclave.

In my experience I have found only the most ultra high end brands are able to match the quality of OEM (or OEM-esque in the case of MPerf). Even Mugen of the world were not able to make CF parts that measure up to OEM standard. I am not saying those aforementioned hoods aren't bc I have zero experience with them. Just saying one should do their due diligence before committing big $$ on one.

The carbon hoods people are talking about are actually Carbon and Kevlar woven together (Carbon Kevlar) rather than pure Carbon as it is too stiff and brittle as the only material for the hood.

Kevlar is very hard to handle that's one main reason for the high cost of these Carbon Kevlar items.

As such it is very important to find a good quality hood with the right amount of Carbon Kevlar composites and the correct structure so it will be more resistant to damage and be safe in the event of a collision. Cheap 'Carbon' hood (though lighter) will most likely develop cracks over time and unsafe in the event of a collision.

I recommend go for one with reputable branding which provides info on how the hood was made. Edison Composites is one of them. The other one is of course the M Performance hood.

[M-Pilot]

M850i configurator is now available on BMWUSA website and one thing I noticed is the CF roof as a factory installed option ($3K). I would have totally added to my order if this was available for M2C as well.

[BAN_M2C]

Originally Posted by cntzl

M850i configurator is now available on BMWUSA website and one thing I noticed is the CF roof as a factory installed option ($3K). I would have totally added to my order if this was available for M2C as well.

[img]

View post on imgur.com

[/img]

I built one today looks similar to this.

Also noticed the 3k carbon roof option. Definitely would have picked that option if it was available from factory.

https://www.bmwusa.com/byo.html#!/bu...mmary/dq1qfbqr

[Dog Face Pony Soldier]

Originally Posted by 3tekcorps

That 2% weight savings won't make a difference unless you're going pro.

Tell that to the guys that cry when the 3 Series gets 1/2" larger. Apparently they can feel the car grow fractions of an inch, yet can't feel any weight savings at all.

[cedchung]

Originally Posted by cntzl

- M2C has a different part number (41008073538) for the hood than OG M2 (41007373899)

I just noticed that. Does anyone know the difference between these 2 hoods?
Thanks

[warrenw]

Originally Posted by F87_LCI

https://www.motorsport24.de/en/m235i-f22-chassis/

This one is "only" EUR 1,890 (USD $2,200; CAD $2,800; AUD $3,025) that includes VAT, so if exporting outside EU do you have to pay it?? Not sure? If not, price is reduced by 19%!

I prefer the look of this one, but shipping must be a bitch from Germany.

Anyone know the weight on it?

I like it a lot, but I wonder if it's possible to order without the vents.