Keep in mind that I’m totally new to this, but isn’t a simple way to calculate springs just by dividing the weight of the car plus downforce?
My Camaro is 2,996 with 56% front. So 2,996 x .56 = 1,677.76, plus 100 lbs for dowforce and I’m at 1,777.67. Divide that by 2 and I have 888.88 for the front. Same thing with the rear only using 44% and 200 lbs of downforce, I get 759.12.
Is it that simple, or am I missing something?
ahh but if you do it that way you are not taking into account for the cars ride height the math you are doing is similar to what TG Wormburner posted in the fm3 days… i will explain
you will need to do this equation for front and rear it can give some ok settings and sometimes not.
take cars total weight add in total downforce (front and rear) next multiply by cars weight balance % (convert into a decimal) take this number and divide by cars ride height next multiply this by the cars lat G’s (found on tuning menu at the bottom left)
alot of tuners tune by feel … there are some that tune using math others by throwing settings at the car and see what sticks
I have been known to use all three of these methods. LOL. But it usually ends up looking like I just threw settings at it to see what sticks. I like the math idea as a basic starting point, and then I tune for “feel”, which is pretty much “throwing settings” to see what sticks. I like to think its more of a knowledge based toss of the settings, mainly because it makes me feel better.
I like your advise though. If I had to offer anything different it would be this:
Try different settings, but only one adjustment at a time. Be drastic at first, to get a real sense of what changed, but don’t save that adjustment. Then, with a knowledge of what will happen, go back and make small adjustments to achieve the desired affect.
Peace.
That makes sense… I’ll give that a shot and see what happens.
Reminds me of Moneyball! 
You found that 1777.67 pounds were going to be pushed down on the front @ 60 mph. Spring settings are in pounds per inch of compressed spring. Therefore, the relationship you’ve chosen is to have a spring that is 50% as strong as the weight of the car, per inch. That’s it. There’s not some magic relationship where the springs can only have one setting, or even one ratio. Changing the front to back ratio of the springs changes turn entry and exit, so don’t be afraid to fiddle around with that. With the springs (and ride height) you should be trying to get them to get good frequency response; that means getting them to be soft enough to absorb the bigger undulations smoothly while being stiff enough to throw your car into the turn (without bottoming out in braking/turning/accelerating).
Fiddle around, see what happens.