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I race a late model in New Zealand, they're are called super saloons here. We have to run steel block engines 6" forward, the #1 plug has to be in line with the centre of the front spindles. To compensate for this and to gain more rear % we run our radiators mounted over the rear end. We have a sliding scale for total car weight versus engine capacity. My car runs a 358ci so has to weigh 2390lbs with me in it, we normally run around 2450lbs to allow for fuel burn off, alcohol in our case. The car has 54-55% rear, what front coil rates would you advise? I should mention our engines have ally heads. Our tracks are mainly stop and go, flat, narrow 1/4 miles. Thanks.
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The actual spring rate is going to depend on the control arm/spring leverage point to get an actual wheel rate. Meaning a spring that mounts more towards the center of the lower arm vs a coil over type set up that is really close to the ball joint will be totally different spring rates to get the same wheel rate. Could be like 500# spring for the spring in middle of arm vs 350# spring close to the ball joint = the same wheel rate.Originally posted by kiwi1955 View Post
So hard to say without knowing the motion ratio of the front suspension, COG, momentum arm, ETC your using. For the most part there isn't a right or wrong answer to some of these things, just different ways of doing things.
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