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what would be the best mods to do to the suspension to
a) reduce understeer under power
b) reduce roll
c) reduce multiple-bounce effect
d) reduce chasis-flex

keeping it simple and non-drastic? suspension only, tires at the moment will have to wait unfortunately. In what order would you do these mods and why? what does each particular part you add do?
trying to collect information here, thanks in advance!

 
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a) reduce understeer under power--??
b) reduce roll-- rsx type- s sway bar, neuspeed swaybar/tie bar comb
c) reduce multiple-bounce effect- koni sturts with eibach or tein springs, or full coilover system
d) reduce chasis-flex, neuspeed front and rear strut brace, and x-brace

 
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a) turn in under braking in our cars is decent, can even set up a decent amount of yaw through a corner, but once power is applied the car just PLOWS, major understeer. Pretty common on FF cars like our Civics, but wondering if there's anything I can add that'll reduce that effect, short of adding a LSD

 
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Rear a/s bar will reduce understeer... So will lowering your car's center of gravity.

This is a quote from the suspension tuning 101 thread....

"If you increase the front roll resistance, the handling balance will change. If the car was neutral before the change, the car will now Understeer. If the car understeered prior to the change, it will understeer more, and if it oversteered, it will oversteer less after the change. The opposite effect occurs at the rear, where increasing rear roll resistance will increse oversteer or reduce understeer. The roll resistance can be increased by incerasing either the sping rates or the antiroll bar rates, or both."

 
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A. Reducing Understeer under power can only be accomplished by 2 things. 1 Get a really sticky set of tires and 2. dont add gass untill the wheel is straight. Think of the Steering wheel as being in control of the Gas pedal. so when the Steering wheel is turned, you have to use less gas, and as the steering wheel gets more centered the more gas you can apply. There isn't a whole lot you can do to fix this in a FWD car its kind of the nature of the beast.
FWD cars understeer under power and RWD cars Oversteer underpower. The good thing about Understeer is that it is relitivly easy to correct, Just do less of what you are doing. If you are steering to sharp, ease off the steering. if you are on the gas, ease off the gas.

Oh ya, A LSD will make Power induced understeer worse!!!!!!! MUCH WORSE!!!!!!!!
The reason for this is in how they work, they force power on to the wheel that has more grip, rather then an open diff were the power goes to where there is the leas resistance. How this ends up working in a turn is : Durring a corner a whole lot of weight is applied to the Front tire on the out side of the turn (Right turns, weight is on the Left) So this tire is doing most of the work, where the Inside tire is doing relitivly little work. On a car with an LSD, if you were to apply power, the LSD would put more power to the tire under load, the Ouside tire, and less on the tire that is not under load (Inside tire). this is bad because durring a turn that outside tire is allready using up its traction trying to get the car to trun. With you trying to get it to accelerate, the Tire now has to use some traction to accelerate. This causes there to be less traction that it can use for turning and thus causes understeer. On an open diff, when you apply power in this situation, the inside tire will get most of the power, where the tire under load will get very little of it. (this will most likely cause the inside tire to spin.) so the tire under load(Outside) still has most of its availible traction to be used for turning. (Less understeer):

B. 2 things here Stiff Springs and Anti-Roll bars.

C. Multiple Bounce is cause by Shock absorbers either being To weak to properly control the springs or by the Shocks being Blown, either way the fix is the same, get better shocks.

D. Reducing cassis flex is very important. Mostly Front Strut bar, Rear Tie Bars (Upper/Lower) Front lower Tiebar(Neuspeed X Brace) a Roll cage will greatly reduce chasis flex, thats about it.


Oh ya, For more information Read THIS

 
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a) Remove front sway bar.
b) Thicker rear anti sway bar.
c) Yeah... stiffer struts.
d) X-brace and strut bars.

 
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Guess what... a stiffer suspension is gonna make everything worse unless you've got tires to take it. So reverse your plans. Buy good tires FIRST, then stiffen everything up. Otherwise the tires are just going to break loose faster.

 
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wow, great info....thanks everyone!

 
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Wait, now i have a question:

Boilermaker, define what tires will take a stiffer suspension!!! I am going to freak out. I've got falkens, but they are 215/40s.

 
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ANYTHING but stock shitstones. Stiffening your suspension is going to make things messy since the tires are so hard and flimsy. The car understeers severely without any bars, now tie everything together and reduce the lateral movement of all the suspension components and the car body... that means the tires have to take the lateral movement, which they can't handle, so the car will slide and understeer worse. Since I got rid of the stock tires and got my Yokohamas, I have not been able to break the car loose a single time except when I'm autocrossing, but you drive twice as hard on the track than on the street. Its doubtful that a "touring" type tire (aka granny tire, plain old road tire with no grip) is going to be able to take too much with out sqealing... but if you've got a decient set of tires, even performance all seasons (Like a potenza 900-series, or a Falken Ziex) you should be fine.

 
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Pick your tires by speed rating and of course by what purpose the tire is for... such as all-season performance, max-performance, ultra-max performance, etc. check out http://www.tirerack.com.

All-season performance tires will last longer than a max performance tire tire. The more you push towards performance, the more you sacrafice a tire's purpose to last long, as well as risking comfort such as road noise. Every tire is different though and it's not impossible to find a worthwhile performance tire that last but the good ones tend to be quite expensive. It's a personal choice. Do some research and before you ask anyone which tire you should get, SEARCH the forums.