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gold28
Forums Junkie

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Madrid - Spain
Registered:
August 2002

Re: AE86 front suspension	Wed, 09 June 2004 06:34

Progressive rate springs are different because the spring stiffness is dependent on the amplitude of oscillation. You could put together a simple program to integrate the equations of motion and simulate it but I don't think it will have much of an influence. My reasoning is as follows; the dampers have the biggest influence on the system as the motion approaches the nominal position (ride height) this is because this is when the undamped system's maximum velocity is reached. Progressive rate springs only start to increase in stiffness as the coils begin to bind. that is at large deflections. At this point of the travel the velocity is low and the dampers will have little influence on the movement. This is a fairly loose assumption and I am sure if you were keen enough you could show some kind of influence on large displacements due to the progressive rate, but for most driving conditions displacements are small and the assumption holds true. Spring rates are easy to measure accuratly with the right equipment. If you don't you could always measure the guard height and then get someone to sit on it and then remeasure it. Knowing their weight and the ammount of movement, you can measure the spring rate. ie kg/mm. This is very rough and will under estimate the rate due to the strut angle, but it will bet you in the ball park. Well I'm going home now..... [Report message to a moderator]

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