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Just installed the karbonius race this evening but have 2 questions if anyone can help...

1. This circular valve which normally clipped on to the side of the original airbox, how have you secured it, I can see there's a mount on the airbox but it would sit vertical not horizontal?
2. No picture, below the airbox, above the dipsick, there's another valve which is rubber mounted and slides on to a tab under the original airbox, again, I can see there's a tab on the karbonius but it's 90degress out, so rather than sitting parallel to the engine it would sit square to it. How have you mounted that one also?

In the mean time I've cable tied while I get mapped but I'm not happy with a cable tie solution and maybe I'm being a bit thick!

Thanks!

The bracket under the filtered section maybe incorrectly installed, mine has no issue fitting that solenoid

The other solenoid for the brake booster feed just hangs.

maupineda wrote: ↑Thu Apr 11, 2024 2:54 am The bracket under the filtered section maybe incorrectly installed, mine has no issue fitting that solenoid

The other solenoid for the brake booster feed just hangs.

Thanks for reply.

The one under the airbox, you just rotated it 90 degrees and pushed onto the tab?

I am waiting delivery of my box towards the end of the month - did yours come with no hole for the IAT sensor?

Justino wrote: ↑Thu Apr 11, 2024 1:28 pm I am waiting delivery of my box towards the end of the month - did yours come with no hole for the IAT sensor?

2024 manufactured race box, comes with hole for push fit csl iat

Had the car mapped today, curve and results all good until just over 6000rpm and then it pulls timing heavily, something like 17 degrees vs stock which is 27 degrees.

Anyone come across that before? IAT sensor was checked and scaled correctly?

RedUn wrote: ↑Fri Apr 12, 2024 6:54 pm Had the car mapped today, curve and results all good until just over 6000rpm and then it pulls timing heavily, something like 17 degrees vs stock which is 27 degrees.

Anyone come across that before? IAT sensor was checked and scaled correctly?

where did you have the mapping done, I will be in the same boat shortly.

Justino wrote: ↑Tue Apr 16, 2024 11:37 am

RedUn wrote: ↑Fri Apr 12, 2024 6:54 pm Had the car mapped today, curve and results all good until just over 6000rpm and then it pulls timing heavily, something like 17 degrees vs stock which is 27 degrees.

Anyone come across that before? IAT sensor was checked and scaled correctly?

where did you have the mapping done, I will be in the same boat shortly.

Will PM you.

I'm slowly going through it replacing bits before I confirm if their map is the problem...

Plugs & coil packs done, HELLA IAT due anytime to compare to the FAE one I have and new widebands on way

Some further updates on this, replying here just so the useful info is on the forum for anyone in the future.

Lesson number 1, IATs are not created equal, I had an FAE CSL scaled one and swapped for a Hella with the same scaling. On a cold day the difference between them was nearly 5%. Car runs better with the Hella edit to add, car runs roughly 10degs above ambient at normal road speeds.

Lesson number 2, coil packs and plugs, might not be giving any spurious CELs or running issues but they can cause a problem. 2 of the coils had quite different resistance readings to the other 4 once I removed them and got them on the meter. Plugs looked OK but no point doing half a job. Full new set in, again, car much better at high rpm.

3. Not confirmed yet, but from logging fuel trims and lambda voltages, I think one of the lambdas is on its way out. New ones here, mission to fit with the exhaust on the car so will tackle that once the weather warms up and report back.

Hopefully helps any future people out

Its arrived!

Justino wrote: ↑Thu May 23, 2024 5:27 pm Its arrived!
2024-05-07_09-26-52_122.jpeg

2024-05-07_09-32-50_011.jpeg

So sexy

It's a shame to hide it under the bonnet!

Edit to add, they also sell a thermal insulation kit, which I didn't know. I've just picked one up to fit to the airbox.

Might be worth getting on before you fit yours

I did see the thermal kit, but looks pretty ugly I think. My thoughts are that the air is moving pretty quickly so once moving the air shouldn’t be heat impacted.

I’ve spent tonight making a bracket to hold the relocated dip stick. I made a cardboard template first to work out the angles. Once the airbox is in it will sit under the bracket, not on top in the photos. It will bolt onto the thread of the bobbin which is screwed into the airbox.

Still debating who to use for the remap to Alpha N. I prefer a company with specific experience, and a physical site in the UK with a rolling Road.

That rules out Severn as its over the internet, they are also the more expensive. https://www.severntuning.com/collection ... 0621267077

A Reeve Performance are an option https://arperformance.co.uk/product/bmw ... -diameter/

Has anyone used TRS - https://www.trsperformance.co.uk/produc ... s54-tuning

Any other options to consider?

thanks

ps. more build photos to come in the coming days.

Justino wrote: ↑Mon Jun 03, 2024 11:01 pm I did see the thermal kit, but looks pretty ugly I think. My thoughts are that the air is moving pretty quickly so once moving the air shouldn’t be heat impacted.

I’ve spent tonight making a bracket to hold the relocated dip stick. I made a cardboard template first to work out the angles. Once the airbox is in it will sit under the bracket, not on top in the photos. It will bolt onto the thread of the bobbin which is screwed into the airbox.

Clever idea, but I think this will interfere with the mounting of the box to that bracket on the engine. there are two rubber studs that thread to the airbox, then to the c opening on the engine bracket with a nut. you do not want the box to seat on the bracket without the rubber studs or will end up cracking something.