tractng
My understanding is this:
Understeer: You turn the wheel, but the car doesn't turn as much as you moved the wheel. So, you turnthe wheel say from 12oclock to 2oclock, but your car only turns like you put the wheel at 1oclock. So, that means you are probably going a bit too fast to make a turn that tight.

Oversteer. You turn the wheel a little, but the car turns a lot, usually once you start to oversteer, the car tends to want to do a 360 to correct it. This is bad it's much easier to slow down and correct and understeering problem than it is to correct and oversteering problem.

CaptinB

 

I found what I think is the perfect solution to the understeer. I run stock size 245/45/18s on the rear and 245/40/18s on the front. The 245/40/18 has the exact same diameter as the stock 225/45/18 so there is no chance of confusing the TC/VDC computer and the wider front tire eliminates the understeer.

 

No there isn't any rubbing with 245's in the front. The traction control works also with the 245/40-18's all around during normal driving. It may be a little touchy but I don't find any problem with it. I am not suring about racing because I always turn it off.

 

not quite captain b

 

Race cars are NOT setup to understeer. Have you ever heard the phrase "loose is fast"? It's true. A car that is loose can turn in much harder, and apex later, and make the straights much longer. I've driven several race cars, and they are all very loose, and require a LOT of finesse. Some less experienced drivers may prefer a tight car, but when they get tired of being at the back of the pack, and get some skills, they loosen it up.

If your car is understeering, first slightly UNwind the steering wheel so you are providing less turning force. (conterintuitive), at the same time breathe off the throttle, or possibly breathe on the brakes. (depending on situation.) Your tires will gain traction, and then you can start to turn back into the corner a little harder. If you do to much, you can induce "lift throttle oversteer" becareful of this. This is why I say "Breathe". Remember to unwind your steering wheel as soon as possible. Get your turing done quickly. The more time the steering wheel is straight, the faster you will go.

Trail braking goes a long way to help turn in also. This take a lot of finesse and practice to do at full speed on the edge of traction.

If your into auto-xing, look for an "evolution driving/auto-x school" They are cheap, and from what I hear, excellent sources of info for everyone from beginners to old timers.