KARBONIUS E46 Hood

[bmw m3 s50]

It's full CF. MK doesn't make the fiberglass version anymore. I didn't write it down, but I think it was 3,5 kg. OEM should be 14 kg.

It's literally light where you lift it with one finger.

Though the MK is not made in an autoclave.

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Is this the same hood listed in the link in the first post? Something is not adding up. The site itself says the hood is available in fiberglass and carbon for a difference of 200 euros.

The site lists the weight of the fiber glass as 8.5 kg and carbon as 7 kg. That translates to fiberglass at 18.7 pounds and carbon at 15.4 pounds.

Why would the manufacturer list these weights heavier then they are, if the point is that the parts are lightweight?

3.5 kgs translates to 7.7 pounds which is about right if the hood is a true carbon fiber hood.

Also does yours have vents or no vents like OEM?

On a separate note, has anyone actually gotten an official weight on the OEM aluminum m3 hood?

[bmw m3 s50]

Slon's hood is full carbon and a claimed 11 pounds lighter than stock. their trunk is lighter than what karbonius was able to manage with theirs


Seibon is documented to be heavier than stock and unlikely to be the only one but most aftermarket hoods are partial carbon and around 5 pounds lighter than stock.


i just cant get over the goofy styling elements Karbonius is deciding to add to their E46 M3 parts. first the fenders now this hood. hopefully they include stock looking options

Hey, do you have a link to the hood? I can’t find it on the Slon site.

[Gearhead55]

Fenders yes, this hood most definitely no looks proper and tasteful, but please believe there will be people that will want the fins in CF which would be atrocious. The GTR style hood imo would only work with a body kit akin to the real GTR, so something from Flossman, and at that point you're 10k deep in full body kit which I'm not after.

Also waiting on details, anything that takes weight off the front of the car is pretty much top priority along with parts that will stiffen the front as well. Slon is a bit extreme, I dont think this will be as light, we have the trunk as an example. However Slon themselves have sacrificed panel rigidity in the name of weight, as outlined in one of their posts. So there's that as well.

Bonus hot air venting, which I already do when going to the track by removing my cabin air filter housing, freen hood vent and minus 10lbs or so.

How much does panel rigidity of the hood matter though? It's only connected to the car by two hinges and a latch, it's not really a stressed component right?

[Obioban]

How much does panel rigidity of the hood matter though? It's only connected to the car by two hinges and a latch, it's not really a stressed component right?

Only matters if it blows apart at high speed.

[Gearhead55]

Only matters if it blows apart at high speed.

good point

[Slonik]

There is no way that the hood they produce is full carbon fiber for an extra 200 euros. It’s probably fiberglass with carbon overlay like every other hood out there.

Karbonius is different as they can produce products in full carbon fiber not fiberglass with carbon overlays like everyone else.

karbonius offer 2 options for the trunks, like someone wrote here on forum, and full carbon piece goes for higher cost. so i think needs clarification and about hoods options also.

about MK - its a piece of shit. in all ways, absolutely. we have one on the one of our customers car, cause "he wanted a lot the hood with the vents"

too much grinding from all sides (on the sides till we got the holes) to get proper gaps.
this vents is the separate pieces which is glued to the main piece, and around them you also need a lot of work to get flat surface (if you don't do it, this would be on the plain sight).
cabin vent didn't fit from begin at all. not even close. thickness around this hole was up to 5mm in some places (oem hood thinner in a few times in this frame), so we had no chance to fix factory mesh to there -also a lot of grinding with a huge lost of rigidity in the end.
and i think you already understand, that it made from fiberglass.
only one thing we was surprised - with this thickness they did less weight then on stock . not a lot, but if im correct maybe 2-3kg, dont remember. but i think its due to the removed large area (center) of the inner frame. they've simply cut it from oem design.

our main carbon guy spent 2 days to made raw preparation for respraying. so after that it still needed "more usual" preparation work.

other thoughts:
i've made about month ago excel sheet with weight reduction parts comparison on my car, and over that i've add cost, to get kg/$ ratio.
hood is the worse thing on overall the car with the highest ratio. i'm looking to try titanium exhaust on the next season and even it more effective .

ps i saw, someone wrote "slon" earlier. delete us from comparison , sorry, we can not offer anything with the hoods to US market, due to the hoods size. even roofs are smaller (they are the largest pieces we ship). for today only trunks, front fenders or roofs (from the large pieces, which we can ship).

[Feffman]

I picked up a carbon fiber hood from Mike Shaw (http://mashaw.biz/bmw_hoods.asp) in California for the race car. It has functional side vents. I had the front grills from the old hood (aforementioned Seibon boat anchor) and I picked up the carbon fiber rear vent cover from a firm in The UK. The Aerocatch hood latches were installed to avoid weight of hood mechanicals.

Feff

[usdmej]

Hey, do you have a link to the hood? I can’t find it on the Slon site.

they posted a cf hood and specs on their instagram page but, based on their response in this thread, doesn't look like they ship it to the US

[Cronenberged]

I picked up a carbon fiber hood from Mike Shaw (http://mashaw.biz/bmw_hoods.asp) in California for the race car. It has functional side vents. I had the front grills from the old hood (aforementioned Seibon boat anchor) and I picked up the carbon fiber rear vent cover from a firm in The UK. The Aerocatch hood latches were installed to avoid weight of hood mechanicals.

Feff

How was fitment and install? I know yours is a track car, but would it pass some of the more strict personalities wanting close to OE fit and alignment?

[Feffman]

How was fitment and install? I know yours is a track car, but would it pass some of the more strict personalities wanting close to OE fit and alignment?

Install was a breeze. Had to trim a little of the inside to fit the Aerocatch latches and make room for hood prop. Fitment is good. Is it show car quality???!!

Feff

[bigjae46]

Seibon and VRS hoods are CF overlaid on FG chop mat (the cheapest FG reinforcement) using polyester resin. I know it’s polyester because epoxy is incompatible with the binders in FG chop mat.

I actually made a CF hood for my car. Made a mold from a new OEM hood. It’s stiff and won’t flex. The downside is it is heavier than stock. I used an infusible core which added a lot of weight.

I am going to delete the core on the next go around. The hood will likely flex and move at high speeds without the core. I could use some unidirectional reinforcements in some areas to reduce the flex at minimal added weight…still brainstorming.

The other thing to think about is the underside. If you want a factory replica then you’re going to add a lot of weight. I’m only making the underside of my hood with the hinge attachment points. I’ll have to use hood pins in place of the latches.

[c watson]

I think Karbonious should’ve made a CSL style front bumper before the hood.

[Thoglan]

I'm still waiting for them to make a diffuser so I can replace my awful fitting one

[freshprince2421]

I'm still waiting for them to make a diffuser so I can replace my awful fitting one

Full CSL Group-Buy: Bumper, Trunk, Diffuser...

Euroconnex, take our money lol

[Altaran]

Is this the same hood listed in the link in the first post? Something is not adding up. The site itself says the hood is available in fiberglass and carbon for a difference of 200 euros.

The site lists the weight of the fiber glass as 8.5 kg and carbon as 7 kg. That translates to fiberglass at 18.7 pounds and carbon at 15.4 pounds.

Why would the manufacturer list these weights heavier then they are, if the point is that the parts are lightweight?

3.5 kgs translates to 7.7 pounds which is about right if the hood is a true carbon fiber hood.

Also does yours have vents or no vents like OEM?

On a separate note, has anyone actually gotten an official weight on the OEM aluminum m3 hood?

Whoops. Don't know why I typed 3,5. Meant to say 6,5. Sorry about that...

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