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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

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///MBan
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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by ///MBan » Tue Aug 30, 2022 11:55 am

Karbonius have come back with responses to my questions:

Q. There appears to be quite a lot of flex in the top of the plenum. People have expressed concern that this could result in the unit failing over time, probably where the two parts are bonded together. Is there a way to strengthen the top? Or do you think this isn't needed?

A. Yes, a lot of flex on the top, this is because this unit was made without the inner pilar reinforcement, we are installing a inner reinforcement ( like the ones we are using in the CSL airbox) and we will test again, I hope not to loose too much sound!! Anyway ,I´m not worried about the union between 2 pieces, I´m sure will not fail on this area, we are using a very good glue, it support a lot of cicles of flexion and traction

Q. Is it possible to order the plenum without any logo or writing on the top?

A. Yes , no problem, we could send it with the Mpower sticker separately ( not glued under the varnish)

I also asked about the rubber coupling and they advised that their plenum is designed to work with part number 11617830265. This is part from the CSL and pre-2004 M3.
https://www.realoem.com/bmw/enUS/pa..._ ... 1617830265

Can anyone confirm if Z4 and post-2004 M3 rubber couplings work with the CSL airbox? I have never read that they DON'T, but would like to confirm as the rubber boots are quite expensive.

Jon2215
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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by Jon2215 » Tue Aug 30, 2022 12:38 pm

Can only say that when my Geoff Steel airbox was fitted we had to change the rubber boots due to the later S54 having different diameter boots to the earlier variant.
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///MBan
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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by ///MBan » Tue Aug 30, 2022 10:44 pm

Jon2215 wrote: Tue Aug 30, 2022 12:38 pm Can only say that when my Geoff Steel airbox was fitted we had to change the rubber boots due to the later S54 having different diameter boots to the earlier variant.
Thanks - I've had a couple of other people confirm the rubber boots are not interchangeable. Bit of a bummer given they're not cheap.

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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by MrPT » Tue Aug 30, 2022 10:48 pm

Sounds really good - it has that depth to it which you don’t really get with just a carbon intake.

Do you know what the weight is? The OE plenum is about 5kg, which isn’t ideal given its location.
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///MBan
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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by ///MBan » Wed Aug 31, 2022 12:37 pm

MrPT wrote: Tue Aug 30, 2022 10:48 pm Sounds really good - it has that depth to it which you don’t really get with just a carbon intake.

Do you know what the weight is? The OE plenum is about 5kg, which isn’t ideal given its location.
I actually haven't asked about the weight... a bit of an oversight on my part, so I will ask.

///MBan
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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by ///MBan » Sat Sep 03, 2022 2:34 am

Karbonius have added a 'pillar' to the plenum to reduce the flex and re-tested. Volume appears to be unaffected. Possibly there's a slight change in tone? Video below.

To plan a production run, Karbonius are asking for people to indicate if they intend to buy one. I'll start a list on zpost (https://www.zpost.com/forums/showpost.p ... tcount=150). Don't forget that Z4 people and post-10/2004 M3s will need to buy the old rubber couplings and matching clips for the plenum side (parts 3 and 4 here https://www.realoem.com/bmw/enUS/showpa ... Id=11_3517). Or, you can buy the Turner silicone coupling kit, which is quite a bit cheaper than buying new OE parts.

Karbonius plenum with extra reinforcing:
[youtube]https://youtube.com/shorts/-6nf6_zrNxY?feature=share[/youtube]

Karbonius plenum without reinforcing:
[youtube]https://youtube.com/shorts/NtCRPz1705A?feature=share[/youtube]

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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by Hydro_Z4 » Sat Sep 03, 2022 7:34 am

A quick question regarding payment.
I'm assuming each buyer will be invoiced and pay directly from Karbonius?

If so, is it possible to be invoiced ex-VAT if the buyer is a company within the EU?

///MBan
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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by ///MBan » Sat Sep 03, 2022 9:20 am

Hydro_Z4 wrote: Sat Sep 03, 2022 7:34 am A quick question regarding payment.
I'm assuming each buyer will be invoiced and pay directly from Karbonius?

If so, is it possible to be invoiced ex-VAT if the buyer is a company within the EU?
I haven't been given the payment process yet, but I will ask for it when I get back to them on Monday with the number of people that have indicated they will buy a plenum. The payments will definitely all go directly through Karbonius, though - I don't want anything to do with that!

I'm not really sure how VAT works for you guys, so I couldn't say. I'd imagine it would be the same as for their other products?

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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by Hydro_Z4 » Sat Sep 03, 2022 9:24 am

Please add me to the list :-)

///MBan
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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by ///MBan » Sat Sep 03, 2022 9:58 am

Hydro_Z4 wrote: Sat Sep 03, 2022 9:24 am Please add me to the list :-)
Will do - thanks :)

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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by Sajk » Sat Sep 03, 2022 2:14 pm

What is the price again?

///MBan
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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by ///MBan » Sat Sep 03, 2022 11:44 pm

Sajk wrote: Sat Sep 03, 2022 2:14 pm What is the price again?
1,200 Euro plus a little bit more for the extra reinforcing.

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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by Sajk » Sun Sep 04, 2022 12:39 pm

OK thanks. That's 7% of what I paid for a complete M roadster with 40,000 miles on it in mint, and I mean mint, condition. I appreciate the effort involved but spending 7% of an entire bmw on a little carbon is madness. Best of luck.

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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by Silva1 » Sun Sep 04, 2022 5:16 pm

:rofl:

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Karbonius CF reproduction of standard S54 plenum **PROTOTYPE VIDEO**

Post by biZ4rreMids » Sun Sep 04, 2022 6:49 pm

:rofl:
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