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this must be a stupied question but what is understeer and what is oversteer? Im also geting eibach anti roll kit its 26mm in front and 16mm rear and is that a good set up let me know.

thanks

 
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Check out the AutoX FAQ for more about suspension.
Oversteer - when the rear end of the car moves out while the front stays planted
Understeer - when the front end of the car moves out while the rear stays planted

OEM settings on most cars is to make them understeer because it is safer. RWD cars can oversteer much easier than FWD cars. Go take a turn at 50mph and you will feel the front plow. Change some bars around and you can have the *** end slipping out before the front end plows.

The Eibach kit will make your car feel more neutral but it will still understeer. Zzyzx is currently running a 16mm front sway bar with a 19mm rear sway. He will be getting a 25.4mm rear sway. That will make his car oversteer, but if he can control it then it is better for racing.

 
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For the street that will probably be Fine. The car will still want to understeer at its limits (and thats what Keeps people safe) If this is for track days or autocross..... Then the Front bar is too big and the rear bar is too small.


Deffinitions:
Understeer
Understeer happens when a vehicle's front wheels are tracing a larger arc in a turn than the rear wheels. This is often described as "push" or "pushing" - as the front end feels like it is ploughing off the corner. Further acceleration only compounds the push, as weight shifts back to the rear drive wheels and off the front turning wheels, leading to a further lessening of the car's ability to turn in. Understeer can be remedied by slight modulation in throttle to transfer weight forward to the front wheels, aiding their traction and ability to negotiate the turn.
Many cars are designed to have a tendency to understeer. If the driver gets uncomfortable and "lifts" off the gas, that will cause the front end to tighten the curve - a relatively safer, and more predictable condition.

Oversteer
Oversteer happens when a vehicle's rear wheels are tracing a larger arc than the front wheels or the intended line of the turn. Rear "slip angles" exceed those of the front tires. This is often described as a "loose" condition, as the car feels like it may swap ends, or be "twitchy."
This condition can be caused by "power oversteer", where you need to reduce power in order to bring the back end back into line.

Oversteer can be exploited in performance driving to negotiate bends at a much faster speed than would otherwise be possible


Moral:
Understeer keeps people safe on the street, Oversteer helps you win a race.

 
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how about for mostly 'touring' with the occassional a-x.. would going 22mm in the rear with stock front be too 'uncontrollable' for day to day street driving? I think my car is really understeering bc it takes more 'turning' to handle the canyon corners.. I'm not really looking to 'make' my car oversteer.. I'd still like it to slightly understeer for street safety but i'd like it to be more balanced than stock's 25mm-to what it is like 15-6mm in front gap?...If acceleration puts all the weight in the front and it still has slightly more weight than the rear .. I'd figure it would even things out..

 
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So you'd have the 25.4mm front bar and a 22mm rear bar? That would probably be good for the street.