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2011-2014 Mustangs
Driveline/Suspension
OEM Boss springs+ Koni's on a GT/Brembo car?
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<blockquote data-quote="lsxjunkie" data-source="post: 14351887" data-attributes="member: 82556"><p>I wanted more transition stiffness and it was cheap. If I were to do it over, I'd go with the stock rear bar and a stiffer front bar. Steady state cornering, I haven't pushed the car hard enough to know which end is going to wash out first. The mountain roads around here are too tight for that.</p><p></p><p></p><p></p><p>Boss 302 front and rear springs and Koni Yellows? Can you describe this jittery feeling better? Would the car skip over bumps? Was the problem coming from the front or the rear? What did you have your shocks set at? The Boss springs are much stiffer in the rear than in the front, and I'm wondering if I shouldn't go with the 55D springs in the rear instead to get the car at the height I want it but with a softer rate to match the front.</p><p></p><p></p><p></p><p>Boss springs are 148 front and 186 rear. There are hundreds of people using Koni Yellows with BMR's springs, which are 165F and 165 R. Sam Strano ran Koni Yellows on his autocross Brembo car with stock springs, at 131F and 167R initially. I really don't think that the spring rate is too soft for the additional compression damping in the Koni Yellows. The Laguna Seca shocks are stiffer on both compression and rebound than the base Boss 302 shocks, but the front springs are 11lbs softer.</p><p></p><p>Additionally, both the Steeda Sports and the Steeda Ultralites, which are sold by Sam Strano as a package with the Konis, come with a 175lbs rear spring, softer than both the Boss (186) and the LS (191) rear spring.</p><p></p><p></p><p>See also, this thread.</p><p></p><p><a href="http://www.svtperformance.com/forums/showthread.php?893081-koni-yellows-w-stock-brembo-springs" target="_blank">http://www.svtperformance.com/forums/showthread.php?893081-koni-yellows-w-stock-brembo-springs</a></p><p></p><p>However, be careful in there, because some people use Boss springs to refer to OEM boss springs, like Highway Star, and some people use Boss springs to refer to the Steeda Boss springs, which are a drop spring and significantly stiffer.</p><p></p><p>At the end of the day, I just wish someone would sell a spring at BMR rates with the Boss drop. I need the ground clearance and I do NOT want to mess with pinion angle. Also, I do not want a progressive rate spring.</p></blockquote><p></p>
[QUOTE="lsxjunkie, post: 14351887, member: 82556"] I wanted more transition stiffness and it was cheap. If I were to do it over, I'd go with the stock rear bar and a stiffer front bar. Steady state cornering, I haven't pushed the car hard enough to know which end is going to wash out first. The mountain roads around here are too tight for that. Boss 302 front and rear springs and Koni Yellows? Can you describe this jittery feeling better? Would the car skip over bumps? Was the problem coming from the front or the rear? What did you have your shocks set at? The Boss springs are much stiffer in the rear than in the front, and I'm wondering if I shouldn't go with the 55D springs in the rear instead to get the car at the height I want it but with a softer rate to match the front. Boss springs are 148 front and 186 rear. There are hundreds of people using Koni Yellows with BMR's springs, which are 165F and 165 R. Sam Strano ran Koni Yellows on his autocross Brembo car with stock springs, at 131F and 167R initially. I really don't think that the spring rate is too soft for the additional compression damping in the Koni Yellows. The Laguna Seca shocks are stiffer on both compression and rebound than the base Boss 302 shocks, but the front springs are 11lbs softer. Additionally, both the Steeda Sports and the Steeda Ultralites, which are sold by Sam Strano as a package with the Konis, come with a 175lbs rear spring, softer than both the Boss (186) and the LS (191) rear spring. See also, this thread. [url]http://www.svtperformance.com/forums/showthread.php?893081-koni-yellows-w-stock-brembo-springs[/url] However, be careful in there, because some people use Boss springs to refer to OEM boss springs, like Highway Star, and some people use Boss springs to refer to the Steeda Boss springs, which are a drop spring and significantly stiffer. At the end of the day, I just wish someone would sell a spring at BMR rates with the Boss drop. I need the ground clearance and I do NOT want to mess with pinion angle. Also, I do not want a progressive rate spring. [/QUOTE]
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OEM Boss springs+ Koni's on a GT/Brembo car?
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