Mazdaspeed 3 Suspension Set Up

dooodstevenn wrote: All this talk about motion ratios and rates (in Hz) has left me even more confused.

Hz is a nice way of comparing spring rates between dissimilar suspension setups.

Yep.

Read here and click around for more info:

http://farnorthracing.com/autocross_secrets5.html

FWIW with struts and FWD the 2.2-2.5hz thing may be a little light based on some other successful FWD setups.

flatlander937 wrote: FWIW with struts and FWD the 2.2-2.5hz thing may be a little light based on some other successful FWD setups.

Possibly, but have we established what the OP is doing with the car before jumping right into nationals level autocross setups?

In reply to MCarp22:

No Auto X, just HPDE.

Well that's some important info then. I didn't read hard enough into the "banked corner" part the first time.

FWIW a national 2 driver did a time attack yesterday with 700/600 rear, running TWO heavy rear sway bars, no front bar, and loved it FWIW.

Keep in mind, the 2 has an axle and doesn't get toe changes the same way as the 3's multilink.

MCarp22 wrote: Keep in mind, the 2 has an axle and doesn't get toe changes the same way as the 3's multilink.

What is the equation you used to calculate natural frequencies based on motion ratios you posted about earlier in the thread?

Assuming you're using lbs/in:

3.14 * ((({springrate} * ({motionratio}^2)) / {cornerweight})^(1/2))

I use this calculator here:

http://farnorthracing.com/autocross_secrets16.html

Tire spring rates will technically bring down the frequency too. That's a bit more interesting to calculate.