Auto Racing: Suspension, wrc cars, stiff suspension


Question
QUESTION: I didnt mean to say you said it was neccessary because i was in school and i was getting rushed off the computer. i was asking about y is it neccessary in the snow. but you answered that without a direct question. thanx man. but i do have alot of questions. I understand that a higher ride hieght will be needed for rough terrain. also a more negative camber angle will be needed in contrast of the load shifting of higher ride height and soft suspensions. So i understand about soft suspensions and ride hieght due to comfort and performance. But for hard suspensions i dont understand to much. I heard that it was a such thing as suspensions to hard and stiff. how is that a negative thing in performance? i hope i dont bother you with to many questions.

ANSWER: no bother at all man... this is why i am here

hard suspension gives you best stability given that the road surface is smooth... hard suspension will decrease body roll to a bare minimum and car will be very low thus able to take corners without fear of flipping

problem is with bumpy surfaces were hard suspension will tend to cause the wheels to slightly fly of the surface of the road and accordingly grip is lost and the car will tend to move around and bounce and the control is not so good

you can see that F1 cars got very stiff suspension 'cause they run on smooth circuits but on WRC cars they run on normal roads, cut corners and some times even jump so that kind of "F1 hardness" is not good for WRC cars

things will get softer and softer as the roads go more rough... OK the soft suspension is not so good in corners but if you have too stiff suspension you will have problems every were 'cause your car will keep on "dislocated" of the line you are going even on a straight line.

also this effect will have an impact on acceleration and braking... since your tires are constantly jumping off the road surface then your braking/acceleration will be intermittent as well and your braking power and acceleration rate will suffer badly

MMamdouh

---------- FOLLOW-UP ----------

QUESTION: Ok u did answer most of my question. but i guess i didnt ask a certain one right. On smooth Road surface y is it possible that the car can have an overstiffness to the suspension? y cant they be hard as possible?

Answer
it is simply because their aren't any 100% smooth roads out their to be suitable for a car with such stiff suspension as you described... what you are aiming at is kinda like frozen water surface

any road surface no matter how smooth it is will have some bumps and will be un even... this is why suspension system has to interact with them and the more bumpy the road the less stiffness you need to let the suspension handle the bumps and keep the car stable

suspension can be as stiff as you want... the problem is their isn't any roads that are smooth enough for that.

MMamdouh