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The Terminator
Suspension Modifications
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<blockquote data-quote="DCguy" data-source="post: 16845987" data-attributes="member: 196849"><p>No, the stiffer rear springs is due to the IRS. As the rear axles articulate individually and the suspension geometry of an IRS, you need more spring pressure per side compared to an SRA swapped car.</p><p></p><p>For example, an SRA car, having the same 400# springs up front, would use a 250-300# rear, compared to the IRS car's 500-600# rear.</p><p></p><p>Typically, you need more spring pressure where there is more weight in order to keep the forces in check. In a front engine car like ours you'd need stiffer springs in the front than in the rear, however the IRS changes that relationship a bit.</p><p></p><p>Most coilovers for our cars are 2.5in in front and 2.25in in rear so the front coil is always bigger/beefier than the rear. I think there are some companies that offer a 2.5in in the rear as well, but you'd likely run into some clearance issues with the underside of the rear shock towers with those bigger units.</p><p></p><p>For guys running aluminum blocks instead of iron blocks or for those that have stripped a large amount of weight out of their cars, this also means that you don't need as stiff of a spring.</p><p></p><p>The weight savings from a Teksid block is about 80 pounds, so an iron block car with a 400# front spring would feel not too different from an aluminum block car with 350ish# springs. That's a pretty rough example, as it completely excludes shock valving which is something you also want to take into account, but you get the idea.</p></blockquote><p></p>
[QUOTE="DCguy, post: 16845987, member: 196849"] No, the stiffer rear springs is due to the IRS. As the rear axles articulate individually and the suspension geometry of an IRS, you need more spring pressure per side compared to an SRA swapped car. For example, an SRA car, having the same 400# springs up front, would use a 250-300# rear, compared to the IRS car's 500-600# rear. Typically, you need more spring pressure where there is more weight in order to keep the forces in check. In a front engine car like ours you'd need stiffer springs in the front than in the rear, however the IRS changes that relationship a bit. Most coilovers for our cars are 2.5in in front and 2.25in in rear so the front coil is always bigger/beefier than the rear. I think there are some companies that offer a 2.5in in the rear as well, but you'd likely run into some clearance issues with the underside of the rear shock towers with those bigger units. For guys running aluminum blocks instead of iron blocks or for those that have stripped a large amount of weight out of their cars, this also means that you don't need as stiff of a spring. The weight savings from a Teksid block is about 80 pounds, so an iron block car with a 400# front spring would feel not too different from an aluminum block car with 350ish# springs. That's a pretty rough example, as it completely excludes shock valving which is something you also want to take into account, but you get the idea. [/QUOTE]
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