CF doors by Carbon Microsystem

[Carbon Microsystem]

We are currently planning to start production of carbon doors for E46 Touring and Sedan. If anyone is interested, write to PM.

[Carbon Microsystem]

I will add some new photos of carbon doors for BMW E46 coupe

[Carbon Microsystem]

Another batch of carbon doors has been shipped.

[bigjae46]

I think the crash bars will be useless on these doors. On any impact, carbon fiber generally will shatter not deform like metal. I am just thinking if there is an impact along the side of the car, I would think the carbon fiber would shatter at the crash bar mounting point from the force causing the crash bars not to anchor like it is supposed to do making them useless.

It seems the only way to get true protection from side impact when using these carbon fiber doors is a having a full roll cage.

It depends. The yield strength on the carbon can be significantly higher than steel and aluminum. Layup of the carbon and different cloths can double the strength. I'd guess that the door panel would contain a lot of the debris. No real way of knowing without testing or a lot of engineering.

That said, I personally would only install carbon doors on a caged track car where I wear a helmet with the visor down.

[usdmej]

I would think the carbon fiber would shatter at the crash bar mounting point from the force causing the crash bars not to anchor like it is supposed to do making them useless.

The crash bar is threaded, and the anchor bolts directly to the bar, not the door. the door itself only contributes a mounting hole that orientates the bar.

considering when the door is closed that the anchor point is only millimeters away from the grab point of the chassis, imo I don't think the door skin is contributing anything meaningful structurally in an accident


Fwiw I sold my doors to a guy with a dedicated track car, he bought them because he was told that you can strip a door to kingdom come as long as you keep the crash bar. As soon as you stop using it is when they make you run door bars/roll cage.

[bmw m3 s50]

I think the crash bars will be useless on these doors. On any impact, carbon fiber generally will shatter not deform like metal. I am just thinking if there is an impact along the side of the car, I would think the carbon fiber would shatter at the crash bar mounting point from the force causing the crash bars not to anchor like it is supposed to do making them useless.

It seems the only way to get true protection from side impact when using these carbon fiber doors is a having a full roll cage.

[George Hill]

Depending on price I would be interested in touring doors or even a hatch.

[Carbon Microsystem]

We make the moulds from high-quality shrink-resistant resin and they have special inserts for aligning the two sides of the doors. Therefore, when we glue carbon doors, we can guarantee that the doors will have the same geometry as the original door.
We also scan some parts, but this is more for modeling and not for control.

[Bry5on]

CARBON MICROSYSTEM, any chance you'd consider sedan doors? Would be cool for people who have converted their sedan/wagon into m3.

Standing by - M3 touring conversion here

After producing first articles of doors with frames, do you scan the parts with a professional 3D scanner, or fit them to some master measurement device to ensure that they retain the OEM shape? Or is the frame rigid enough that they just pop from the mold and fit perfectly? Thanks

[Carbon Microsystem]

Carbon fiber doors for BMW e92

[Carbon Microsystem]

We made front doors with glass frame on the E60

[Carbon Microsystem]

CARBON MICROSYSTEM, any chance you'd consider sedan doors? Would be cool for people who have converted their sedan/wagon into m3.

Theoretically possible, but to start such a project we need at least five clients. There are four doors and the production of molds will be very expensive.
Also keep in mind that due to the glass frame, such doors will be a little more expensive than for a coupe.

[enjoy_m3]

CARBON MICROSYSTEM, any chance you'd consider sedan doors? Would be cool for people who have converted their sedan/wagon into m3.

[Obioban]

^ thank you for posting!


unfortunately an opportunity came up for me to sell my car so unfortunately i will not be able to finish this project.

Booooooooo

[usdmej]

^ thank you for posting!


unfortunately an opportunity came up for me to sell my car so unfortunately i will not be able to finish this project.
hopefully somebody can pick up my doors and complete it for the forum to see, they've been listed in the forum marketplace

https://nam3forum.com/forums/forum/classifieds/members-parts-for-sale-wtb/e46/286306-carbon-fiber-doors

i'll leave this thread with some information i dug up on on how the crash bar works


it seems like the door itself does not do much in terms of protection in an accident. the crash bar however, is designed to hook onto the B pillar (or C pillar in a 4door) to prevent intrusion into the vehicle.





this is the hook, it bolts directly to the crash bar inside the door, the door simply acts as a placement spot for it to work properly in a crash since the hook will dig into a pocket/indentation in the B/C pillar


i'm a little surprised that flimsy looking crash bar is designed to actually hold anything back, but obviously bmw engineers think (and know) different.


i would definitely run the crash bar in a street driven car