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Old 05-21-2004, 08:49 AM   #13
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Join Date: Jul 2003
Chapter/Region: NESIC
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2006 Ford E350
Parked in a school zone


Originally posted by BriDrive
Most manufacturers' equip their cars with spring rates geared toward an overall road going strategy and how those spring rates work together with the particular struts, control arms, stock ride height, tires and a whole list of intangibles that came together through their own R&D.
Very nice post, but i have to throw in a little caveat with this particular issue. This would be correct if you take the wheel rate (the effective spring rate of the car that the wheel sees, determined by spring rate and the motion ratio of the spring on that particular corner of the car). For the Subarus and 1990+ Porsches, the motion ratios front to rear are about the same, but there are cases (any BMW 3-series from 1983-present comes to mind) where the actual spring rates may be a different ratio than the weight distribution (in the case of the BMW's, the actual spring rates are higher in the rear proportional to weight distribution). This slightly more broad generalization also accounts for other types of springs as well (leaf springs, torsion bars, etc)
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