Originally posted by S3diment
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Apparently Karobonius were on holiday last week, but they said the testing will be done this week. Fingers crossed!
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Apparently Karbonius was on holiday last week, hence no real update other than they hope to test the prototype this week. This being Friday, hopefully they get to it today!Originally posted by S3diment View Post
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Karbonius has test-fitted the plenum and made a video, as well as videos of the same car with a completely stock intake and the same car with their CSL-style intake. I've posted the videos below. Karbonius are on holiday until 30 August but provided a few comments when they sent me the videos:
"I just sent you 3 videos,
1- OEM airbox, you can see the results in dB , minimum 72,2 and maximum at 5000 rpm 106 dB
2- CSL airbox , minimum 79 , maximum at 5000 rpm 130.2 dB
3 -Karbonius OEM style airbox, minimum 74,3 , maximum at 5000 rpm 118,7 db.
Sorry for the quality of the video, maybe doesn't´do justice comparing with real sound, but I think you can hear the difference between the 3 boxes.
We have 2 dB more in the low measure and +12,7 dB in the revolutioned measurement . The Karbonius OEm style airbox is not as louder as the CSL airbox, but clearly louder than the OEM one.
We checked on the car and drove few kilometers, and we could hear clear the sound of the box, specially between 2500 to 4000 rpm, driving at few rpm and putting gas in 4th or 5th gear is easy to heard."
I also asked a couple of questions:
Q. Will the price be the same as originally estimated (1,200 euro)?
A. Yes , at the moment we will keep the price, but I´ll confirm you when we will make the 2nd unit!
Q. How long will it take to put into production?
A. We can start the production in middle of September
Videos:
Karbonius carbon fibre S54 plenum
https://youtube.com/shorts/NtCRPz1705A?feature=share
Karbonius CSL-style intake
https://youtube.com/shorts/D8S_IVLXTEc?feature=share
OEM
https://youtube.com/shorts/LV8jRFmXMyg?feature=shareComment
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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..._CSL&mg=11&sg=40&diagId=11_3517&q=11617830265
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.Comment
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They don't work and Turner has aftermarket ones if you can't find a used set.Originally posted by ///MBan View PostComment
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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.php?p=29291402&postcount=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/showparts?id=BL96-EUR-10-2003-E46-BMW-M3_CSL&diagId=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:
Karbonius plenum without reinforcing:
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I still don't have a firm production / delivery date but I can confirm the price will be 1,280 Euro and that people will purchase directly through Karbonius's website.
Also, two reinforcement pillars have been used (just like their CSL airbox).
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Any idea when will it be ready for ordering? I am ready to place the orderOriginally posted by ///MBan View PostComment
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I've asked a couple of times but haven't received a firm answer. The most recent reply simply said that they will start to produce the airboxes and add it to their online shop. This was on Wednesday last week.Originally posted by maupineda View Post
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Karbonius has just confirmed production starts next week. The price they have provided - 1,280 Euro - is a once-off for people on the list and will subsequently be $1,395 Euro. You will need a unique coupon to get the introductory price, which will be entered when you order on their website. I will send Karbonius the list and they will provide the coupons, which I will then send to individuals.
I've tried to contact as many people as possible who previously expressed an interest and I'm pretty sure the list is up-to-date but please check:
Delivery dates will depend on how many people place an order. As I understand it, you can make x plenums from one mould before it breaks or becomes unusable. So, depending on numbers they may need to make a second mould, which will take some time.Comment
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UPDATE: Karbonius will email the coupons to people, so if you put your name on the list, I will be sending PMs to ask for your email address. If you don't get a message from me, please get in touch!Comment
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Quick update:
I passed on a few more questions to Karbonius, which they are addressing.
One person asked if forged carbon is possible for the plenum, with the answer being 'no'.
Another person asked if it is possible to test the plenum to make sure it doesn't result in a loss of power, which Karbonius is going to do.
A few people also wanted someone to test the plenum before buying and Karbonius thinks that's a good idea before making it available. They will send the first one to me and I'll test and report back.Comment
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Some good news: the first production plenum has shipped and is on its way to me.
I'm hoping to do some side-by-side testing with a local E46 M3 owner who has a CSL-style intake.
Karbonius also has a plenum on their E46 and are putting some km on it.
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Karbonius has said the plenum will be available today on their website and I have sent through the email list to them. If you're on the list, you should receive your discount code soon.
Today they also tested the plenum on the dyno and found it was +4HP, but noted that this is not really significant but certainly looks like there is no loss.
I hope to install mine this weekend and do some testing. With a bit of luck I'll post up some video before next week.Comment
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