on my teg, i have a WW RS front lip, it's pretty beefy, but i can imagine that it's adding a lot of drag to the car... when im on the highway doing 80+ my car is easily pushed around simply by going at those speeds and i was wondering if the lip had anything to do with it...

 

The lip helps cause a low pressure area for the air traveling underneath the car inturn causes a high press area which pushes down on top of the car near the hood latch. If your car stability at high speeds is an issue it could be several things. If it were me, I would have my alignment checked. If not your alignment, your rear suspension setting would need an increase in stiffness. Variances in the amount of downforce is rocking the wieght of the car from front to back thus taking traction off of the rear wheels(highly unlikley but I've seen it before at very high speeds 120+).

 

damn where can i learn about this stuff? seems kinda confusing

 

http://www.gmecca.com/byorc/index.html

one of the best sites around for a general overview.

 

obviously you have a migrating center of pressure with respect to the pitch center which causes oscillation due to turbulent flow of high reynolds number

 

^ pfff, duhh

 

Goto barnes & noble or something and get a basic book on physics. Try also seaching online for airplane physics etc...

 

To give you an easy to understand answer, air flowing under the car is bad. It looks like your lip helps prevent that, so it should actually be helping things, but I haven't seen it in person.

Like others have said, you want to have lots of pressure over the car and little under it; this creates downforce and helps hold you to the ground. Drag mostly just slows you down, but lift (opposite of downforce) slows you down and makes you unstable. Air under the car creates this lift.

Some other things that affect high speed stability:
- suspension (ride height, stiffness)
- alignment (correct toe is important; negative camber isn't a problem in a straight line unless it's excessive)
- rear wing (I've found the Type-R wing to be beneficial)
- tires (sticky tires and I'm confident at 150+; cheap street tires and 100 is a bad idea)
- negligence (busted or worn out parts, improper tire inflation, etc)