08-10-2021, 09:15 AM | #1 |
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Brake vent ducts
Has anyone removed/opened these at the track for better brake cooling?
Is it safe to have them permanently open?
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08-10-2021, 11:38 AM | #2 |
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I remove mine whenever I go to a track just because BMW recomends it, and it is easy to do, and then reinstall them at the end of the day. Opening them will obviously increase the air flow, and potentially lower the temps of the calipers; pads; rotors; wheels; and tires to some extent. I am willing to trust the engineers on this, but I am still curious. I see tire temps as high as @ 175F (dash display) with them open. Maybe I will leave them in place sometime to see if the temps go higher. Science! Mom and Dad would be so proud.
I also don't understand why BMW has covers over these vents in the first place. They don't completely block the flow, just reduce it by what appears to be about 50% -70%. They do state clearly that the covers need to be in place during all driving other than on a track, but I have not seen a reason stated for this. Anyone?
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08-10-2021, 12:51 PM | #3 | ||
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I took my car up to Vegas when the temperature was around 110 f and my tire temps only got to like 135f with the brake ducts in. |
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08-10-2021, 08:55 PM | #4 |
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I didn't know about the brake duct covers so I did two days on the track with them in place. Tires got up to 215F before I backed off. On the third day, the tires just took a tiny bit longer to make it above 200F.
You two must be driving slower to see such low temperatures
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08-10-2021, 08:57 PM | #5 | |
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It's a good idea to clean up on the covers on a regular basis because they might clog up with bugs, rocks, plastics, etc
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08-10-2021, 10:45 PM | #6 | |
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Was originally thinking of taking these off for spirited back road drives - but now I think I'll leave them on 100% of the time except for track days. |
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08-11-2021, 11:08 AM | #8 | ||
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08-11-2021, 01:06 PM | #9 | |
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There's a good view of the duct in this video at 2:01 -
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09-06-2022, 09:27 PM | #10 | |
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I still want to know the answer to this question. I'm going to reinstall mine when on the street in an abundance of caution. |
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09-09-2022, 09:09 AM | #11 |
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Removing the dust shields should help with airflow.
You lose some protection from gunk and debris but it's worth it. Hopefully, someone like Racing Brake will sell a kit with SS pistons (i assume the OE ones are aluminum) along with high temp boots and seals like they offer for the F8x's blue brakes. That, coupled with some girodiscs and dust shield removal should help a lot. |
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09-10-2022, 09:08 PM | #13 |
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My car barely gets driven on the street (except to and from tracks) so I have left them off for now. Will re-install after the next track event.
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09-12-2022, 04:06 PM | #14 |
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Ive posted this before, but i drive with these on all the time..massive reduction in brake temp
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09-12-2022, 06:14 PM | #15 |
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09-12-2022, 07:07 PM | #16 |
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i am also using the speed engineering brake duct system. fairly easy install. +1
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04-18-2023, 07:36 AM | #17 | |
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https://southernbm.com.au/products/s...8x-m3-m4-nzlnm
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04-21-2023, 06:44 PM | #18 | |
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The amount of stones and debris stuck in it every time I remove it, is alarming. Especially when you have CCBs and have to be extra careful. In fact, I keep them on even on on track most of the time as well, since CCBs afford you a luxury of not worrying about overheating, unless you go full push mode - which I learned quickly is not really the purpose of this car (stock) anyway. |
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04-25-2023, 08:25 PM | #19 |
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I've heard they ask you to keep them on for gas mileage reasons. There's more drag with them off, and the advertised mpg was calculated with it on. Similar to how some cars default to auto start/stop on.
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05-29-2023, 08:26 PM | #21 |
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Not dumb, but yes with the wheels turned its easy to do.
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