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The Terminator
Suspension Modifications
Sloppy, Squishy Front End Feel
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<blockquote data-quote="Bingo13" data-source="post: 13193989" data-attributes="member: 4923"><p>Here is the quick cheat sheet (at MM and a few other places)-</p><p>Wheel rate is the effective suspension spring rate as measured at the wheel. Depending upon suspension arrangement and geometry, the wheel rate is usually a fraction of the spring rate. A heavier wheel/tire package increases wheel rate.</p><p>A stock '79-'04 Mustang's front wheel rate is 1/4 of the spring rate. A Mustang Cobra independent rear suspension (IRS) has a wheel rate that's 1/3 of the spring rate. For example, a stock '03 Mustang Cobra has 600-lb/in springs front and rear.</p><p></p><p>Front wheel rate = 600 lb/in x 1/4 = 150 lb/in</p><p>Rear wheel rate = 600 lb/in x 1/3 = 200 lb/in</p><p>Front coilovers have a wheel rate of 9⁄10 the spring rate. Rear IRS coilovers have a wheel rate that’s 1⁄2 the spring rate. For example, an ’03 Mustang Cobra with coilovers has 400-lb/in front springs and 650-lb/in rear springs.</p><p></p><p>Front wheel rate = 400 lb/in x 9⁄10 = 360 lb/in</p><p>Rear wheel rate = 650 lb/in x 1⁄2 = 325 lb/in.</p><p>-----------------------------------------------</p><p></p><p>I ran either 375/575 or 425/650 depending on the track I visited along with the daily driving duties. The problem with this car is that most people will underspring the front end when switching to coilovers. You end up with a '70's era bounce in the car and will unnecessarily shorten the lifespan of the struts. 350 is the minimum and honestly 375 is where I based my optimal street setup. The difference between 400 to 425 is minimal in ride harshness but 425 seemed to pair better with 650 rears on the technical tracks.</p></blockquote><p></p>
[QUOTE="Bingo13, post: 13193989, member: 4923"] Here is the quick cheat sheet (at MM and a few other places)- Wheel rate is the effective suspension spring rate as measured at the wheel. Depending upon suspension arrangement and geometry, the wheel rate is usually a fraction of the spring rate. A heavier wheel/tire package increases wheel rate. A stock '79-'04 Mustang's front wheel rate is 1/4 of the spring rate. A Mustang Cobra independent rear suspension (IRS) has a wheel rate that's 1/3 of the spring rate. For example, a stock '03 Mustang Cobra has 600-lb/in springs front and rear. Front wheel rate = 600 lb/in x 1/4 = 150 lb/in Rear wheel rate = 600 lb/in x 1/3 = 200 lb/in Front coilovers have a wheel rate of 9⁄10 the spring rate. Rear IRS coilovers have a wheel rate that’s 1⁄2 the spring rate. For example, an ’03 Mustang Cobra with coilovers has 400-lb/in front springs and 650-lb/in rear springs. Front wheel rate = 400 lb/in x 9⁄10 = 360 lb/in Rear wheel rate = 650 lb/in x 1⁄2 = 325 lb/in. ----------------------------------------------- I ran either 375/575 or 425/650 depending on the track I visited along with the daily driving duties. The problem with this car is that most people will underspring the front end when switching to coilovers. You end up with a '70's era bounce in the car and will unnecessarily shorten the lifespan of the struts. 350 is the minimum and honestly 375 is where I based my optimal street setup. The difference between 400 to 425 is minimal in ride harshness but 425 seemed to pair better with 650 rears on the technical tracks. [/QUOTE]
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