Quote:
Originally Posted by Kayshart
For track situations, what would happen with a sticky tyre like AD08R with springs which are not stiff enough? Would this mean the suspension will be hitting the bumpstops through the corners? Would this worsen the car's handling? Would stiffening the damping help?
But wouldn't it still be better than having stiffer springs but crappy tyres?
Just for reference, my setup is koni shocks with RCE yellow springs 4.5kg square.
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If the car isn't tuned to utilize the bump stops it will probably create erratic behavior if the body roll is high enough and the bump stops are stiff enough. Basically the car will all of a sudden get an extremely high spring rate once the suspension gets compressed into the bump stops, any changes in the road surface like a bump or kerb when the car is riding on the bump stops will jolt the chassis likely causing a loss of grip, even potentially a very small one. Whether or not this would be the case with the soft-ish Ohlins or B16's (which are nearly double the spring rate of OE) and AD08's I can't say, but bump stops can be shortened.
On a smooth course with well chosen bump stops maybe nothing will happen, totally unnoticeable, I've heard that the new ND miata is rather bump stop active from the factory. But bump stops can create some very undesirable behavior, namely sudden at the limit under or oversteer.
Again, I don't know if the AD08's are sticky enough to cause this behavior, they are geared for street/track use and a somewhat reasonable life expectancy means they aren't total gumballs, it will also depend on the track and setup (raising the car up will allow for more travel and more predictable suspension behavior). When you start getting into this level of detail even people with similar setups may not be comparable as they run big fast courses where they load up the car a ton vs. quick short courses that won't generate the g's to overwork the suspension with that level of grip.
Agreed with racecomp, damping would only help reduce roll in the scenario where your cornering isn't sustained, like an autocross and that would be a crutch where you're removing ultimate grip in order to band-aid another problem (springs not being stiff enough, ride height too low, bump stops too tall/stiff).