09-22-2004, 06:06 AM
Join Date: Sep 2004
Location: Norwich, UK
Hey no probs, glad you like it. Just remember that this does not take into account roll bars etc, just purely the main spring. I use these figures in my setup sheet which then tells me the % front roll stifness.
You calculate this by:
Front wheel rate / (front + Rear wheel rate)*(100)
I.E, say the springs and positions you are using give the following wheel rates...
Front wheel rate = 180g/mm
Rear wheel rate = 165g/mm
180 / (180+150) = 0.545 * 100 = 54.5%
That tells you that the front of the car is 54.5% of the total cars roll stiffness - simply the front is slightly stiffer than the rear.
In an absolutely ideal world, with good weight distribution, sensible roll centers, CofG etc (*can opening, worms everywhere!!!!*) around 50% front should equal a near neutral car, less than 50% front should equal lots of front end and greater than 50% front should equal gradual push or more rear grip.
I like a very aggressive car, so, depending on the tyres I usually start around 46 - 48% front and fine tune with damper oil, roll bars, ride hight etc.....