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The Terminator
Suspension Modifications
Coilover Spring Rate question (IRS)
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<blockquote data-quote="Teej281" data-source="post: 11120823" data-attributes="member: 61920"><p>Taken right from Maximum Motorsports website:</p><p></p><p>Q. How do I compare a Mustang front coil-over spring rate to a conventional Mustang spring in the stock location?</p><p></p><p>A. The spring rates must be converted into wheel rates. The wheel rate is the spring rate measured at the wheel. The conversion is done through the use of what's called the motion ratio. For a stock Fox Mustang front suspension, the wheel rate is 25% of the stock location spring's rate. For example, an 800 lb/in stock location spring has a wheel rate of 200 lb/in. For a coil-over suspension, the wheel rate is approximately 90% of the coil-over spring's rate. For example, a front coil-over spring rated at 350 lb/in would result in a wheel rate of about 315 lbs/in. Note: The exact motion ratio conversion of the wheel rate for a front coil-over suspension is determined by the angle of the strut. That angle is the result of the camber and caster settings, and by the SAI (Steering Axis Inclination). </p><p></p><p>Q. How do I compare a Mustang rear coil-over spring rate to a conventional spring in the stock location on my independent rear suspension (IRS) equipped Mustang?</p><p></p><p>A. The wheel rate for the rear of a Mustang with IRS is approximately 33% of the spring rate in the stock location. For example, a 600 lb/in stock location spring has a wheel rate of 198 lb/in. For a coil-over suspension, the wheel rate is approximately 50% of the coil-over spring rate. </p><p></p><p>I'm personally running 325lb front springs and 525lb rear springs. I'd say what you got is probably decent for road racing/auto-x. I'd be running stiffer springs but I couldnt get the dampers necessary to run the higher spring rates. Soon though. I'd stick with what you got with the stock shocks and struts though. Maybe go to the spring ratings that I have. BTW, you have to get the shocks grooved to accept the coilover kit. Not the struts though, just the shocks.</p><p></p><p>BTW, my MM coilovers aided in me getting 5th at the auto-x at Mustang Week in Myrtle Beach...in my IRS-GT with minor bolt-on's. Best of luck! :beer:</p></blockquote><p></p>
[QUOTE="Teej281, post: 11120823, member: 61920"] Taken right from Maximum Motorsports website: Q. How do I compare a Mustang front coil-over spring rate to a conventional Mustang spring in the stock location? A. The spring rates must be converted into wheel rates. The wheel rate is the spring rate measured at the wheel. The conversion is done through the use of what's called the motion ratio. For a stock Fox Mustang front suspension, the wheel rate is 25% of the stock location spring's rate. For example, an 800 lb/in stock location spring has a wheel rate of 200 lb/in. For a coil-over suspension, the wheel rate is approximately 90% of the coil-over spring's rate. For example, a front coil-over spring rated at 350 lb/in would result in a wheel rate of about 315 lbs/in. Note: The exact motion ratio conversion of the wheel rate for a front coil-over suspension is determined by the angle of the strut. That angle is the result of the camber and caster settings, and by the SAI (Steering Axis Inclination). Q. How do I compare a Mustang rear coil-over spring rate to a conventional spring in the stock location on my independent rear suspension (IRS) equipped Mustang? A. The wheel rate for the rear of a Mustang with IRS is approximately 33% of the spring rate in the stock location. For example, a 600 lb/in stock location spring has a wheel rate of 198 lb/in. For a coil-over suspension, the wheel rate is approximately 50% of the coil-over spring rate. I'm personally running 325lb front springs and 525lb rear springs. I'd say what you got is probably decent for road racing/auto-x. I'd be running stiffer springs but I couldnt get the dampers necessary to run the higher spring rates. Soon though. I'd stick with what you got with the stock shocks and struts though. Maybe go to the spring ratings that I have. BTW, you have to get the shocks grooved to accept the coilover kit. Not the struts though, just the shocks. BTW, my MM coilovers aided in me getting 5th at the auto-x at Mustang Week in Myrtle Beach...in my IRS-GT with minor bolt-on's. Best of luck! :beer: [/QUOTE]
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