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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Roof Spoiler functionality



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      10-21-2012, 07:45 PM   #1
kpjo4
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Roof Spoiler functionality

Does anyone know if the AC Schnitzer roof spoiler is actually engineered for high speeds or is it mainly aesthetic?

Here is a picture of it and it seems to be the most common roof spoiler I see on E9X cars.
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      10-21-2012, 09:14 PM   #2
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I doubt it creates much difference. You would benefit more from suspension upgrades than a roof-spoiler for high-speed stability. Unless we are talking like 170+ mph, in which case it might create a few extra lbs of downforce, still not worth it at a performance perspective. Also, i wouldnt say that it is a performance inhibitor either. Having your windows down would influence your aerodynamics more than having this or not having this.


My $0.02, which you can take with a grain of salt.
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      10-21-2012, 09:51 PM   #3
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just for looks
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      10-27-2012, 05:38 PM   #4
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just for looks
I admit. I have one, and it just for looks.
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      10-27-2012, 06:44 PM   #5
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Looks only.
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      10-27-2012, 07:31 PM   #6
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Can't speak for the roof spoiler, but the OEM trunk spoiler allegedly kills 50 lbs of lift @ 100 mph.
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      10-28-2012, 04:47 AM   #7
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it's engineered to fuck up the rain water and have it swirl around the window instead of running off.
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      10-28-2012, 01:16 PM   #8
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Can't speak for the roof spoiler, but the OEM trunk spoiler allegedly kills 50 lbs of lift @ 100 mph.
the m3 oe one?
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