Spring Swap thread?
04-21-2014, 12:06 PM
#1
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Spring Swap thread?
I posted here because it's suspension specific, but will understand if the thread is to be deleted or shifted to classifieds.
I know that years ago on Honda-Tech and for a moment on Nasioc there was a thread where people could offer up springs they no longer used or wanted to try. I was wondering if there were enough people who autocross/track their cars to facilitate this type of a thread here on MT.net.
For instance, I'll be acquiring a set of XIDA's soon, running 800#/500# springs. But I'm thinking that would be too stiff for New England roads for daily use and some autocross. I just didn't want to buy brandy new springs (just yet) if someone has some kicking around collecting dust.
WTB:
Diameter: 2.25"
Length: 6"
Springrate: 700#
Diameter: 2.25"
Length: 6"
Springrate: 400#
FS($70 per set)/FT:
Diameter: 2.25"
Length: 6"
Springrate: 800#
Diameter: 2.25"
Length: 6"
Springrate: 500#
I know that years ago on Honda-Tech and for a moment on Nasioc there was a thread where people could offer up springs they no longer used or wanted to try. I was wondering if there were enough people who autocross/track their cars to facilitate this type of a thread here on MT.net.
For instance, I'll be acquiring a set of XIDA's soon, running 800#/500# springs. But I'm thinking that would be too stiff for New England roads for daily use and some autocross. I just didn't want to buy brandy new springs (just yet) if someone has some kicking around collecting dust.
WTB:
Diameter: 2.25"
Length: 6"
Springrate: 700#
Diameter: 2.25"
Length: 6"
Springrate: 400#
FS($70 per set)/FT:
Diameter: 2.25"
Length: 6"
Springrate: 800#
Diameter: 2.25"
Length: 6"
Springrate: 500#
Last edited by psyber_0ptix; 04-21-2014 at 04:40 PM.
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11-08-2014, 10:07 PM
#12
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I'm sure it's been discussed before, but you can calculate spring rates for your ebay springs that should be fairly close. You need only your spring's wire dia, OD, and free length. You can calculate it by hand, or use an online calculator; here's the one I just tried:
Coil Spring Rate Calculations by Wallace Racing
I used it on some known springs and it was close-ish right off the bat. To get closer, I found I had to subtract the thickness of the paint from the wire diameter and OD - I was surprised it made such a profound difference, but if you look at the formula the wire dia gets ^4. Subtracting .005" for paint (thus .010" for the wire dia and spring OD) brought the calcs to within 3 lbs/in.
Now, I'd still take any calcs like this with a grain of salt - not only did .005" make a difference of 30 lb/in, the spring material can also make a difference depending on what the modulus is.
Coil Spring Rate Calculations by Wallace Racing
I used it on some known springs and it was close-ish right off the bat. To get closer, I found I had to subtract the thickness of the paint from the wire diameter and OD - I was surprised it made such a profound difference, but if you look at the formula the wire dia gets ^4. Subtracting .005" for paint (thus .010" for the wire dia and spring OD) brought the calcs to within 3 lbs/in.
Now, I'd still take any calcs like this with a grain of salt - not only did .005" make a difference of 30 lb/in, the spring material can also make a difference depending on what the modulus is.
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