E30 Aerodynamics

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blasphemy101
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E30 Aerodynamics

Postby blasphemy101 » Mon Sep 10, 2012 4:35 am

Anyone know anything about the aerodynamics of the e30? I know the numbers are probably roughly equivalent to a brick, but I'm curious if anyone has experimented with lips, spoilers, diffusers, etc. and what their results might have been.

From the little bit that I've read, it looks like ///M changed quite a few things to improve the profile of the M3.
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Re: E30 Aerodynamics

Postby Nsquared97 » Mon Sep 10, 2012 4:42 am

You nailed it, the aero of a brick haha. What exactly are you thinking of, improving the aero for better MPG's, downforce?? If I remember correctly a stock E30 as a COD of about 0.38, M3 was way lower, maybe 0.32? Either way, the big thing with the M3 was the C pillar change, and the trunk sitting as high as it was. There was a thread on R3V about it a while back, I'll post the link here if I can find it.
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Re: E30 Aerodynamics

Postby blasphemy101 » Mon Sep 10, 2012 4:48 am

Nsquared97 wrote:You nailed it, the aero of a brick haha. What exactly are you thinking of, improving the aero for better MPG's, downforce?? If I remember correctly a stock E30 as a COD of about 0.38, M3 was way lower, maybe 0.32? Either way, the big thing with the M3 was the C pillar change, and the trunk sitting as high as it was. There was a thread on R3V about it a while back, I'll post the link here if I can find it.


Not necessarily looking at improving anything at this point, considering the last e30 I drove with any kind of performance in mind was an M3 over a year ago. Mostly, I'm just curious. If anything, downforce might be nice at some point. since my '87 doesn't have a rear valence, I don't see a whole lot of rear lift, unless the low trunkline is really that much of a problem. The M3 was very impressive - the most stable car I've ever driven, not that that's saying too much.
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Re: E30 Aerodynamics

Postby blasphemy101 » Mon Sep 10, 2012 4:51 am

Actually, now that I think of it - I wonder if the low front valence/lack of a rear valence has any beneficial effects for the '87 iS. DISCLAIMER: I know nothing about aerodynamics lol
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Re: E30 Aerodynamics

Postby Nsquared97 » Mon Sep 10, 2012 4:58 am

It may be wishful thinking, but I am hoping that having my front valence back on now will help out mileage on the highway just a little. I figure that it should direct the around around the car a bit more than before, where it was all open.
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Re: E30 Aerodynamics

Postby Yoshi » Mon Sep 10, 2012 11:27 am

The M3 front was made to generate some down force. But really, it's the rear wing and C pillars that make a difference.
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Re: E30 Aerodynamics

Postby M20_fever » Mon Sep 10, 2012 1:57 pm

yeah, for a standard e30 your best bet for down force is a big ass wing tall enough to get up into clean air, and a bottom pan that covers most of the underside of the car.
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Re: E30 Aerodynamics

Postby blasphemy101 » Mon Sep 10, 2012 4:53 pm

M20_fever wrote:yeah, for a standard e30 your best bet for down force is a big ass wing tall enough to get up into clean air, and a bottom pan that covers most of the underside of the car.


I was envisioning this earlier today. It seemed so epic in my head.

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