Quote:
Originally Posted by rhyary
Say you calculate and get the numbers
How would you translate that into a setup?
For example, I had a 900 rear spring (divorced) in the rear and I felt a stiffer spring would help. So I got 1100. All I know it is stiffer and I can rotate the car better.
How would a calculation help me arrive at the 1100 spring?
Please connect for me the calculation and how would I know what I need.
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Well firstly, I'd need to know your front spring rate for reference. Comparing front and rear wheel rates gives a good insight into the steady-state handling balance the car will have. Sway bars also come into play but at the moment we will ignore them, they can later be added into the equation to get a fuller picture.
Since the front MR is so high (0.96), the effective wheel rate at the front is very close to spring rate of the physical spring. Most people are running divorced setups, and a divorced setups wheel rate is very low compared to the physical spring rate of the spring itself.
A 1000lb/in rear spring is roughly a wheel rate of ~330lb/in. If your front spring is in the region of 600-800, your front wheel rate is ~550-730lb/in. You can immediately see that the front of the car is substantially stiffer then the rear. To get a more neutral steady-state handling balance you would want to either increase the rear spring rate (by quite a bit as divorced spring rates increases result in small increases of wheel rate), or soften the front - or a combination of both.
I don't have a public spreadsheet available at this time but can declutter my personal one and make it available to all if enough people are interested..