wing comments, rear wing Options

[Glenn832]

This is just a fantastic forum! Being quite the newb, forgive me if I'm on the wrong thread. I need some advise and I know that it'll be freely if not copiously given. I like it already!

We've got a '74 that, at the moment, is in pieces. It's a street/track (little more focus on the track) baby that is getting some minor additions to help with high speed stability. One is the addition of a rear wing. There are two choices. As you can see from the pics, it's not pretty but at this point that's not the point.

What do you think about aerodynamics/functionality and also aesthetics?

[byndbad914]

so the discussion is bringing up some good points - all aero stuff is very car and use dependent. So if you want to AX and have "high" speed oversteer ("high" being quoted as 55-70mph on larger courses is high for AX but not for an interstate hwy let alone road course) then you want a big, FAT wing (fat in foil shape) and will probably run a maximum angle (right near wing "stall") to get both a spoiler and wing effect. So first you add the wing, which tends to overshoot and create understeer. So now you start adding splitter to counteract that to the point of how you want the car to feel.

So my car had NASTY high speed oversteer (125+ mph sweeps at Willow Springs thru T8) with the V8 and 930 trans (both much heavier than stock stuff) but not necessarily low speed oversteer (I can use the go-pedal with all the power to get what I want). So the car was scary. I then went to a whole new car setup (tube chassis, etc) and also added a wing at that time. I have a short splitter because I wanted to tune the car to just a slight plow (At speed expectation of 150+ thru T8 I wanted a safe bit of plow). So if I had stayed in CA to try a longer splitter, at some point the car would have gotten neutral and I would have scaled back to be somewhat safe. That is why I recommend an adjustable splitter that you can slide back and forth to fine tune the front downforce to match the rear and get the driver feel you like (slight over, neutral or slight understeer). You tune the rear to the max downforce that doesn't drag mph down (unless the car is still unstable, then you go up to wing stall to fix that issue even if it slows the car slightly).