understear....... is it due to not enuff grip or cause of too much grip...- (flip if too much grip) or just slide out if too little grip
try yokomo shocks it can set the rebbound and bound stroke
so if u have little grip try full bound (compresion) make sure it does not scratch the bottom chasis thats all then medium rebound ( so u can maintain grip and not change directions too fast )
or is it cause ur suspension is too stiff - little grip
what tires ? surface?
try to soften ur suspension abit then try tires with better grip
or if ur entry is too fast ... SLOW DOWN lol
aside from that what i ment by massive overstear or understear is that cause some people might set their shocks rather soft for GRIP in stock mode so they can take turns faster and once u go to mod in the same setup ... ur car MIGHT do some massive overstear (rear end flippin or squaring off turns sometimes scratching the bottom chasis by compresing too much )
and by compressing too much and bottoming out it also can cause ur car to understear .... so it depends
and some people i know runs a STIFF setup for their car on stock
so they can make the car respond very aggerasively into a turn and in other words carry more speed in the turns BUT this is only achived when u have sufficent grip on the tires and u dont need the soft setup cause more grip would mean flipping the car (or traction roll) and in one way or the other when u change into a mod motor ... u tend to understear into the turns cause the tires have already reached the maximum grip capacity this causing it to slip .......or even overstear cause the car is behaving toooo ageresively ........
well u might say these coments contradict each other but then ... its true....so the key to a good setup is BALANCE to your driving style....its easy to say but its not easyly done ...
generally setting up a car A to car B is rather similar ... its just the ballance which u will have to find
there are other dynamics which i will ahve to take into consideration but then ... this are general things which would happen one of the other things are overstear then understear or vice versa ... but i wont go into that - i have no idea how to explain those ... u need some experence to learn about those explaining wont help much ... and more of all i have NO IDEA how to explain it ... its a behaviour the car shows and its hard to put in to words without actually looking at the car running
this is just my $0.0002 cents
jee thats a LONG post !!