Functional side vent for pressure release?

[DoubleYellow]

I'm interested in learning more about making the side vent (where the side indicator lives on e92 M3) a functional outlet for high pressure air in the wheel well. It won't be as effective as @dogbone's ACR-style cut outs, but I imagine it's better than nothing. I could be wrong!

I searched the forum but came up empty. Anyone try this before?

[gh0stE92M3]

Did you remove the cap? There's a cap when you take that grill out, that's the only thing you can really do unless you wanna cut up your fenders.

[tlrid3r]

Curious too. I was going to look into it but been busy.

[dogbone]

For track use, I don’t think those tiny holes that are behind a fender liner are going to do much in terms of flowing air. Even cutting the fender liner—-I don’t think you’d gain much.

[DoubleYellow]

Got it. Looks like a low priority project then...

Shelving it for now.

[roastbeef]

its possible, but the quality of execution will be the variable. this was one of the things i was intent on exploring when i had my fender off to remove the washer reservoir (you don't actually have to take the fender off, i was sort of exploring).

so, there is a cap on the back of the "vent." i think M division intended for the vents to be functional, but the suits put a stop to it because it probably added $1 to the cost of making the fender liner. most people would probably hate how much dirt and crap would come through it anyways, so i can understand why they scrapped the idea.

e90's have a shallower fender vent than e92's. each car has a slightly different profile and some parts that look alike are actually different. i don't see this being as big of a minute change for the e90's as it is in the e92's.

here is how i would prefer this to be done- vacuum moulded plastic that snaps on to the fender vent, that cones out like a traffic cone to a hole in the fender. four of those 8mm fender screws into some of those fender nuts would secure it.

here is how it could be done- 2" brake duct inlets that attach in a similar fashion, but affixed to the actual vent using a very short brake duct hose.

i don't like 3d printed stuff for things like this. fender wells are a harsh environment and they just don't seem to last with heat and vibration.

Also, keep in mind, unless you're a little nuts like me, you're adding like 4 square centimeters of non-directed air ventilation… on a non ground effect aero car.

[leftfootbr8king]

"…as big of a minute change"

🫠

[roastbeef]

Originally Posted by leftfootbr8king

"…as big of a minute change"

🫠

I'm glad someone noticed that little nugget. :

[bigjae1976]

What's behind the fender?

I've been toying with a similar idea on my E46. I was thinking about filling the cavity with foam to form a plug so I can pull a mold from.

[dogbone]

Originally Posted by bigjae1976

What's behind the fender?

I've been toying with a similar idea on my E46. I was thinking about filling the cavity with foam to form a plug so I can pull a mold from.

On the passenger side, the windshield washer reservoir fills that area inside the fender. We had to completely remove it to create the rear fender vent.

On the driver side, you have the brake booster pump inside the fender. You can move that up and towards the engine for the rear vent. But that’s a bit of a project too.