11-21-2014, 09:33 AM
navin Wrote:I've been trying to get into the "math" of suspension dynamics, and figuring out I hate math.. You might want to read this <!-- m --><a class="postlink" href="http://www.worksevo.com/Spring_Rates_1.pdf">http://www.worksevo.com/Spring_Rates_1.pdf</a><!-- m --> to see if helps with determining what spring rates you might want to run.
Maybe DJ will chime in as well since he is a nerd about this kind of stuff.
Motion Ratios work, until they don't. An E36 with good motion ratios handles like dog shit and is slow. That's not the case for every car though. Calculating out the motion ratios for an E36 has the rear with STUPID high spring rates that make the car almost undriveable. Case of Science Lab /= Real World Experience
There are also so many mistakes that can happen when calculatng motion ratios (such as unsprung weight vs sprung weight for control arms since they are half sprung/half unsprung, spring rate converted to wheel rate, and "spring rate" of a tire can all effect the outcome.
8k/7k sounds close though to what you want. 12k/16k on some street cars makes me laugh so hard when "bros" go OMG it handles like it is on rails just because it is so overly stiff and instead skipping and not gripping.
Again, I am not super familiar with setting up spring rates on a FWD car, just know when you are on the extreme and want to back down.
2020 Ford Raptor
2009 Z06
1986.5 Porsche 928S
2009 Z06
1986.5 Porsche 928S