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Since it might not be practical or feasible to change out the rear window and C pillars, a few bucks for VGs might help. Ebay big wing and whatever splitter-like things you can stick on the front.
Im gonna have to have fun and experiment when I get a LeMons of my own.
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Thought you might enjoy looking at these autospeed articles:
larger here: https://fbcdn-sphotos-g-a.akamaihd.n...57241711_o.jpg
It was good enough to make a noticeable difference at the top of 2nd gear (max speed for autox territory), but in order to make a real difference you need some fresh air (above the roof line). This was in accordance to the Street Prepared rules(10" spoiler in any direction)
edit: also, minimizing turbulence does not necessarily mean that you are creating downforce. Some of you guys are on the right track with creating laminar flow and removing turbulence. getting rid of(or minimizing) low pressure zones on top of the car will be worth your time. VGs have their limit of effectiveness, and they reach a point of diminishing returns. I think that's outlined in one of the articles I link.Last edited by Jaxx_; 01-25-2014, 05:05 PM.
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Vortex generators, yes those might be helpful. The bump above the rear window on the M3 serves much the same purpose causing the boundary layer to trip and spill onto the spoiler. I've sort of wondered what would happen if one were to add some to the existing setup on the M3.
I have to admit it would be fun to stick an E30 in both normal and M3 form in a windtunnel and see what the airflow differences are. Then add things like the EVO front splitter and a set of extra vortex generators and that sort of thing to see just what does actually make a difference and what doesn't.
Will
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Originally posted by Ether-D View PostI built that splitter on the yellow car (Treehouse Racing). Worked on Akard's car too. About 9 years ago… Time flies.
I forgot who ran an off the shelf / ebay ricer wing but thought it was someone in e30 world.
Originally posted by Northern View PostIt might be worth some time looking into if you could find a way to mimic that
E30 are brick-like so could benefit with a few of these near the rear of the roof to reduce drag. Someone should run CFD on this topic. Anyone have an E30 made in CAD already?Last edited by rwh11385; 01-25-2014, 01:42 PM.
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Originally posted by BlackbirdM3 View PostBest aero mods for an E30? Pretty simple, look at an M3, all done by the factory,tested, and race approved. The rear window and trunk lid made a huge difference in reducing drag. That alone lowered the CoD from 0.39 to 0.33, front splitter and airdam? Evo 2 airdam with Evo3 splitter. Seal up all the gaps around the hood and grill, (all stock evo parts that can be ordered with little trouble.)
Will
I think the gurney flap spoilers would be less effective than an actual wing if we're taking drag into account. I obviously don't have any numbers, but the gurney flap does not seem very aerodynamic, plus it is in the wake of the car and not very wide. A full blown wing will be up higher, wider, with more surface area, and much less drag. On the downside, it will be heavier. Not just the weight of the wing, but the mounts you will need to hold it in place.
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Originally posted by rwh11385 View Post
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Originally posted by RoccoB517 View Postrwh11385, what wing is that on the red car? I like the mounting. The uprights look very well done.
His mentions:
Bimmerforums is the preferred online BMW Forum and community for BMW owners. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm ideas for the future.
Bimmerforums is the preferred online BMW Forum and community for BMW owners. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm ideas for the future.
Bimmerforums is the preferred online BMW Forum and community for BMW owners. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm ideas for the future.
Originally posted by NigelStu View PostThis cheap stupid stuff was worth 1-1.5 seconds per lap at Gingerman (South Haven Michigan).
splitter is just 3/8 plywood. Wing has a proper airfoil shape (wood ribs with foam core)
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I think 1980s BMW didn't go too crazy with the aero on the m3's cuz they knew the cokebinge everyone was on would only go too far with purchases... normal people don't go for cars with massive wings and shit... that was a niche market reserved for lamborghini ;)
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Originally posted by E30_Pare View Posti thought a gurney flap was just to improve stability at speed.
I admit to this, I've done 140 mph in my M3 (a very long straight road, that wasn't smooth) and I have to say the car was rock solid despite the road being pretty rough.
Will
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Originally posted by CabbE30 View PostI think what he's saying is the M3 aero bits are designed from the factory to be aero-worthy additions to the E30. Im sure most people haven't thrown a e30 with a GT wing in the windtunnel and done accurate analysis on said parts like BMW had.
Will
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Originally posted by RoccoB517 View PostSo you are saying a stock M3 spoiler is superior to a GT wing? I'm curious as to how that changes when a car is heavily modified, so not within factory spec anymore. I like the idea for using Evo parts for the front end, I'll look into it.
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Originally posted by BlackbirdM3 View PostBest aero mods for an E30? Pretty simple, look at an M3, all done by the factory,tested, and race approved. The rear window and trunk lid made a huge difference in reducing drag. That alone lowered the CoD from 0.39 to 0.33, front splitter and airdam? Evo 2 airdam with Evo3 splitter. Seal up all the gaps around the hood and grill, (all stock evo parts that can be ordered with little trouble.)
Will
So you are saying a stock M3 spoiler is superior to a GT wing? I'm curious as to how that changes when a car is heavily modified, so not within factory spec anymore. I like the idea for using Evo parts for the front end, I'll look into it.
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