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Old 02-23-2015, 11:36 AM   #20 (permalink)
GSS138
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Join Date: Mar 2013
Location: Mission Viejo, CA
Posts: 769
Drives: '12 370Z 6M Sport
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Quote:
Originally Posted by 03threefiftyz View Post
Debated on posting this in the general thread, but it may help...


350z motion ratio is .688 front and .649 rear.
370 oem rear is somewhere around .55, if you switch to true type it is closer to .65, our front oem are around .65/.68. I think this measurement is also affected by your tire width as well because the tire is "extending the lever" a bit. Not 100% sure the correct way to calculate where to measure to, but common sense sort of tells you that if you put a wider tire on it is going to make this number a tad lower, hence needing a stiffer spring.

I still daily my car but have finally settled on 12k/10k full stiff stillen front and I ended up pulling the rear bar completely. I think 12k/ 8 or 9K with a rear OEM bar would probably be nearly equivalent. For autoX nice smooth surface you could definitely go higher, but I think I am at or near the limit of what you would want to DD.

That's a little soft by some standards, but our tracks in socal are not very smooth for the most part, have a lot of elevation changes, and I still need to get over those damn bumps in my office's parking lot.
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Last edited by GSS138; 02-23-2015 at 11:45 AM.
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