What lowering spring should I get?
08-05-2014, 08:15 PM
#23
Originally Posted by tcjensen' timestamp='1405442232' post='23244816
MY08:
(Averaging front and rear)
Average corner weight: 700
Average spring rate: 287
Average free length: 10.64
Average motion ratio: .71
Average compression: 3.44
Average compressed length: 7.2"
To solve for X (free length):
X - ((700/350)/.71) = 6.2
X = 9" FL
So, revisit nmrado's equation in a recent thread and double check the math, but from my working it, a 9" FL 350 lb spring should lower the car 1" and be pretty well handled by the stock shock. 2.5" ID should work well with the stock top hats. Hypercoil makes the best springs.
(Averaging front and rear)
Average corner weight: 700
Average spring rate: 287
Average free length: 10.64
Average motion ratio: .71
Average compression: 3.44
Average compressed length: 7.2"
To solve for X (free length):
X - ((700/350)/.71) = 6.2
X = 9" FL
So, revisit nmrado's equation in a recent thread and double check the math, but from my working it, a 9" FL 350 lb spring should lower the car 1" and be pretty well handled by the stock shock. 2.5" ID should work well with the stock top hats. Hypercoil makes the best springs.
Found this chart:
Any other alternatives if Hypercoil doesn't make a 9", 350 lb spring, with a 2.5" ID.
Swift custom 6.25K (350/56) rate (or 6k) and 228mm free length (9x25.4)
08-05-2014, 08:19 PM
#24
08-06-2014, 10:43 AM
#25
08-06-2014, 01:43 PM
#26
Community Organizer
08-06-2014, 02:11 PM
#27
Community Organizer
When I was younger I would've just slapped some lowering springs on to my car and called it a day. Lol! Now I'm also concerned about ride quality, degradation of handling, quality of the product, etc... and I just find this topic mildly interesting. Hopefully these Q&A will help at least one other person make better informed decisions! Based on twohoos research paper, there's no doubt that the Swift Sports springs are a good match for an early AP1 damper and the Spec R are an excellent match for the CR. I realize that the Spec R will fit and work with any year shock and some owners have given some positive feedback; that being said, the CR is the only S2000 from the factory with stiffer springs up front. Might putting this spring on other models negatively affect the drive/handling in other years (i.e.MY'00/'01 came with 219/291 spring rates; Spec R are at 419/391)?
Originally Posted by tcjensen' timestamp='1407298782' post='23274912
10-14-2014, 09:36 PM
#28
The math says that 8.5" FL Hypercoils in 450f/400r would give a nice 1.2" drop to the front and 1.4" drop to the rear of a CR, slightly reducing the stock rake for a little better rear grip, and keeping things within the range of the stock CR shocks, as well as a linear spring feel as opposed to progressive. Just another option. And hypercoils can be had from gtmotoring for $240 shipped. Cheaper than Swift. And Hypercoils have been measured by spring calipers to be more accurately rated, fyi. But nothing wrong with the swift spec R idea either.
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