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Old 02-02-2013, 07:07 PM   #3 (permalink)
03threefiftyz
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Debated on posting this in the general thread, but it may help...

Again these are highly generalized....using a STOCK 370Z nismo and 350z motion ratios. Taking ~75lb off the rear of the car for light exhaust, no spare/tools, and a minus a few gallons of gas (OP's set-up). This would likely shift the WD from 53/47 (stock) to a bout 55/45 or so...

Front frequencies using 350z MR (OEM LAYOUT), 3240lb with 55/45 WD and equal L/R weights (not going to happen), and taking 65lbs per corner off for unsprung weight...

900lb spring: 2.25hz
1000lb spring: 2.37hz
1100lb spring: 2.48hz
1200lb spring: 2.60hz
1300lb spring: 2.70hz

Rear with same stuff as above...

800lb spring: 2.23hz
850lb spring: 2.29hz
900lb spring: 2.36hz
950lb spring: 2.43hz
1000lb spring: 2.49hz
1100lb spring: 2.61hz

Also in case those are wanting to do the math on their own. Wheel rate = spring rate * motion ratio^2. Sprung weight = corner weight - unsprung weight.

350z motion ratio is .688 front and .649 rear.

Last edited by 03threefiftyz; 02-02-2013 at 07:12 PM.
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