Downforce needed - battle of the craptastic eBay wings

[akorcovelos]

Sub'd

[kamotors]

I'm no expert but...
nascar+ roof wing to channel the air down. Dont really know if those ebay AL rice wings really do much. Maybe some testing with a roof wing to see what angle it needs to be to direct air to the trunk of an E30.

[deutschman]

I guess it comes down to what works better at low speeds. At low speeds I would think you would want more surface area on a wing. I am not sure what the average speed at a Lemons race is, but I know that most airo like this is not very effective at lower speeds (under 100mph). Maybe I am wrong.
I'd give this a read. It might help.

http://www.rapid-racer.com/aerodynamics.php

[CorvallisBMW]

Our Chump/LeMons m30e30 is really struggling with putting down power. We're working on adding some weight to the back end to help balance it out but we think some downforce would also be helpful. A lot of teams run a solid, ducktail-type spoiler like you see on NASCAR. Other teams run universal-fit ricer wings from eBay. I'm not an aerodynamics expert but I'm wondering if anyone out there has experience with adding some downforce to the rear of an e30 and could chime in on the pros/cons of each style. Obviously price is a key point for us, but I also want it to be effective.

universal ricer crap:

http://www.ebay.com/itm/DOUBLE-ALUMINUM-REAR-SPOILER-WING-UNIVERSAL-BRAND-NEW-TRUNK-LID-/390399117418?pt=Motors_Car_Truck_Parts_Accessories&hash=item5ae599c86a&vxp=mtr#ht_1454wt_1187

simple NASCAR crap:

http://www.ebay.com/itm/NASCAR-ALUMINUM-REAR-SPOILER-WITH-ADJ-BRACES-64-1-4-LONG-40-45-DEG-/380426524519?pt=Race_Car_Parts&hash=item5893301767&vxp=mtr#ht_500wt_970