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      04-10-2019, 11:39 AM   #1
Azeka1
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Different Take on Brake Cooling Ducts

After installing a CSF Oil Cooler designed for the E46 M3 with custom AN lines, I no longer had enough space in the lower grill to mount brake cooling ducts. Faced with this dilemma, we decided to try something a bit different and mount the ducts to the plastic skid-plate under the engine.

This is using basic NACA Ducts, Cooling Tubes and Bimmer World backing plates (E46 M3).

After 3 test days on track, one with 83* Fahrenheit temperatures, I can say that fade is definitely down from last year. Compared to last year, I am getting far less fluid boiling and have a more consistent pedal, especially going into hard braking zones. While my pad wear has not improved at all, I am also running quicker lap times due to other suspension upgrades so perhaps pushing the car harder.

Hope that others find this useful and I will report back with more data like pyrometer temperature readings as I get them.

Please pass along feedback/data if anyone has tried this setup before!




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Last edited by Azeka1; 04-10-2019 at 11:45 AM..
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      04-10-2019, 12:27 PM   #2
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I like it! very simple and clean. What did you use for the plenum to connect to the cover?
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      04-10-2019, 12:59 PM   #3
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Quote:
Originally Posted by Barryb97 View Post
I like it! very simple and clean. What did you use for the plenum to connect to the cover?
Thank you! Still gauging their effectiveness and another board member is making 3d printed ducts that can go in place of OEM location. So once they are ready, I will try both and see what yields lowest temps.

I think these were the ducts we used, unfortunately I did not personally make the order on them: https://www.pegasusautoracing.com/pr...p?Product=3628
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      04-11-2019, 02:48 AM   #4
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Prototype done, gonna test fit this weekend and figure out some kind of bracket. It's a little rough in the picture because it is printed on a low setting.






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Last edited by Westersund; 04-11-2019 at 02:54 AM..
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      04-11-2019, 05:39 AM   #5
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Quote:
Originally Posted by Westersund View Post
Prototype done, gonna test fit this weekend and figure out some kind of bracket. It's a little rough in the picture because it is printed on a low setting.
This is great! And assuming that the tubing will not interfere with the front wheel when connected to it?
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      04-11-2019, 03:00 PM   #6
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Using a naca duct under the tray is a pretty cool idea. I've seen it done before. It has the added benefit of drawing air from under the car where you don't want it. Some have also used a naca duct to blow air at the oil pan for additional oil cooling. My only concern with it is whether it would get a forced air effect to push through the rough corrugated tubing.

Those stock location ducts are a bit difficult due to the routing of the tubing. Nice looking bits though.
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      04-11-2019, 04:42 PM   #7
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Quote:
Originally Posted by Michael9218 View Post
Using a naca duct under the tray is a pretty cool idea. I've seen it done before. It has the added benefit of drawing air from under the car where you don't want it. Some have also used a naca duct to blow air at the oil pan for additional oil cooling. My only concern with it is whether it would get a forced air effect to push through the rough corrugated tubing.

Those stock location ducts are a bit difficult due to the routing of the tubing. Nice looking bits though.
Thank you for your feedback, Michael! We got the idea from AJ Hartman's diffuser option. I also have the same concern with the amount of 'Forced Air'.

If possible and if you have any, can you share your brake temperature data measured immediately coming off track? I realize that you have a BBK but would be good to compare none the less.
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      04-14-2019, 03:17 PM   #8
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Quote:
Originally Posted by Westersund View Post
Prototype done, gonna test fit this weekend and figure out some kind of bracket. It's a little rough in the picture because it is printed on a low setting.
If you're willing to share CAD files for this, I can trade you a custom baseplate + upright setup for getting the Bimmerworld Ultralight wing that I'm putting on next week (67" length, 11 3/4" chord)
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      04-15-2019, 06:01 AM   #9
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Quote:
Originally Posted by CTMP4me View Post
If you're willing to share CAD files for this, I can trade you a custom baseplate + upright setup for getting the Bimmerworld Ultralight wing that I'm putting on next week (67" length, 11 3/4" chord)
The BW Wing is awesome, this sounds interesting!!
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Last edited by Azeka1; 04-15-2019 at 12:17 PM..
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      04-15-2019, 09:52 AM   #10
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Quote:
Originally Posted by CTMP4me View Post
If you're willing to share CAD files for this, I can trade you a custom baseplate + upright setup for getting the Bimmerworld Ultralight wing that I'm putting on next week (67" length, 11 3/4" chord)
Sorry, making brake cooling ducts is kind of my thing and I run a business with my brother. I don't want to put in a lot of effort and money and then let it go for free. I might share other stuff in the future though.
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      04-17-2019, 04:22 PM   #11
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Quote:
Originally Posted by Azeka1 View Post
The BW Wing is awesome, this sounds interesting!!
I'll make a separate thread about the wing mounts in 1-2 weeks when wing is mounted and track tested. I have a set of one-off front brake ducts too that use the OEM location scoops + HARD motorsport duct hose kit + a bunch of extra elbows, it seems to work but looks very... improvised.
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      04-27-2019, 01:55 AM   #12
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Yo westersund, Im looking forward to seeing those brake ducts, i need a set. I have my backing plates and hoses ready to go!!
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      04-27-2019, 04:21 AM   #13
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Been busy with other stuff the last week, I'm gonna testfit the duct today and figure out the design of the brackets needed.
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      04-29-2019, 06:35 PM   #14
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Pardon my ignorance, but what are those dingle berries around the I.D. of the back of the rotor?

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Originally Posted by Azeka1 View Post
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      04-29-2019, 08:42 PM   #15
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That's just the design of the steel rotor attaching to the aluminium hat.
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      05-11-2019, 03:14 PM   #16
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Test fitted the brake duct today, it fits fine. I only test fit the passenger side and the horn have to be relocated a little. Now I'm gonna design a bracket.
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      05-13-2019, 06:37 PM   #17
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Quote:
Originally Posted by Westersund View Post
Test fitted the brake duct today, it fits fine. I only test fit the passenger side and the horn have to be relocated a little. Now I'm gonna design a bracket.
+1 on horn relocation, my ducts required the same.
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