05-16-2024, 08:05 AM | #1 |
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Scan data for aero
At the risk of being esoteric, I’m putting this out there even if the chances of someone who’s done this are pretty remote.
I have turned my g80 m3 into a dedicated track build. I’m right at the limit of mechanical grip, weight savings (minus carbon) thus far. I am looking to add meaningful aero to the car. The problem is, no one has created a “bolt on” kit for our cars. And I’m getting the feeling from many of the usual companies that the g87 is their only priority. I get it because if someone is going to turn their g8x into a track/time attack car most of them will be g87 owners at this point. I am looking for anyone who has done an aero scan of a G80 M3. It’s an intensive process that I was quoted 3 full days of labor on. And even if I did pay for it, I’d be giving the R&D to whatever company I use to create the aero. That’s not my goal unless they’re going to pay for the labor. To be clear, I’m not looking for huge aero which will make the car non-street drivable. This mainly comes down to the splitter not sticking out from the front more than 4-6 inches. The wing can be relatively big as long as it’s not wider than the widest part of the car. Thanks! |
05-16-2024, 10:24 AM | #2 |
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I work with wind tunnels often but for structures. Be prepared to spend ridiculous money on this. I'm assuming you were quoted to see what the current flow characteristics of your car are including drag/vertical loads. The problem with this is that the moment you tweak one aero component, the behavior and flow characteristics for the entire car changes - sometimes A LOT. Especially if you're on stock suspension. You really need a stiff racing suspension to be able to tweak things properly.
I know my fluid mechanics but I'm not an aerodynamicist so I can't give you a real deep look into this but just some general advice. The most cost effective way is to lower the car as much as you can and seal the underside as much as you can paired with a good diffuser. It's a low drag, highly effective method of getting downforce. Then determine on the track where you're lacking grip (front or rear) and adjust to your driving preferences. Another thing I've seen a lot of TT guys do and actually most of the lower-mid range aero manufacturers do this as well, is to work entirely off CFD models but those things are extremely easy to screw up, especially if an amateur is modeling it and sometimes even if the model is good, it doesn't always provide 1:1 results in reality. Software is getting a lot better. A few years ago, getting an accurate CFD model was a pain in the ass. Either way, my clients spend 40-75k on wind analysis for scaled models of 40-50 story buildings so I really don't advise you go this route unless you're racing professionally and it's a dedicated race car. |
05-16-2024, 10:39 AM | #3 | |
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05-16-2024, 10:57 AM | #4 |
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So you'd essentially be looking for vertical deflections @ various speeds on each spring/tire to understand where your aerodynamic center is and how many lbs of force are being applied.
Nice setup on the suspension! Seems like you know what you're doing. Are you dealing with front end lift? If so is it in the corners or at higher speeds the front end gets light? |
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05-16-2024, 11:57 AM | #5 | |
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05-16-2024, 12:43 PM | #6 | |
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Today, 06:44 PM | #7 |
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Check out Daigl Composites or AJ Hartman. They might be able to do something for you.
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Today, 06:54 PM | #9 |
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Are you familiar with Jackie Ding (PhD Racing) and the work Verus Engineering has done for his M2 TA build? If not, look into it - should be able to leverage as PhD intended to offer aero solutions for the G8x based on their modeling/testing.
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Today, 07:02 PM | #10 |
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I am familiar with Jackie Ding. He’s practically a celebrity in the TT/SLB and HPDE environment. I reached out to Verus a month or so ago and they haven’t even begun to create anything for the G80/82. They’re G87 all the way for now. I didn’t get the feeling from the response I got back that they were even sure they’d develop aero for our cars. I do appreciate your advice regardless. Thank you!
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