Quote:
Originally Posted by jluetjen
Bill, you make an interesting point about zero roll couple equals zero roll. While reducing role may be a good thing -- why don't all race cars have zero roll couples???? Because doing this makes the car very "wooden" and it lacks feel. To put it differently, the driver will have a hard time feeling what the car is doing. So some roll is desirable -- how much depends on the sensitivity of the driver. Novices will most likely respond better to relatively larger roll couples while Michael Schumacher would quite likely be very fast with a very small roll couple.
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Gonna have to disagree, the roll center can never be raised to the height of the cg because of the geometry of the components, the best you can do is keep it as high as you can while lowering the cg as much as you can. This will minimize the length of the roll couple. I haven't seen 911 mapped out but on 964/993 the rollcenter goes under the pavement unless the RS suspension pieces are used.
steering feel comes primarily from caster and secondarily from toe, the more caster the more self centering the wheel will be, the less toe(to 0) the faster the response to steering inputs
a non assisted 911 wheel feels alive because there is little rubber, lots of caster, little toe and what bump steer exists is transmitted directly into the steering wheel. Lots of people dislike the later assisted steering because of on center numbness, the truth of the matter is that the steering is actually much faster but also has more rubber in the actuation path, reduce or remove the rubber and max caster/min toe brings back a lot of the liveliness, but not all because there is still the power steering hydraulics damping the system, the latest electronic boost steering is much better in this regard but can never be as good as the original 911 steering where there is very little isolating the tire from the steering.
the whole point of stiffer springs is to reduce suspension reaction times, softer springs to a point will generate more grip but it will also take longer to transition and be more disorienting to the driver.