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Old 12-12-2001, 01:45 AM   #1
Member#: 456
Join Date: Oct 1999
Chapter/Region: NWIC
Location: Redmond, WA, USA
2008 Forester XT
Steel Gray Metallic

Default WRX US OEM vs STi/SPT sedan spring rates ... again

Here are my latest wild assed guesses:

OK, the actual FHI specs for the SPT/STi kit is:
38 N/mm F
33.4 N/mm R
(source: SOA, though they quoted N/m not N/mm).

This looks very close to the relationship between what I'd calced for front and stiffest possible for rear (lower coils bound).

That gives us for STi/SPT:
217 lbf/in F
190 lbf/in R

If you then take my prior comparisons between the springs -> 27% stiffer at front, and 107% stiffer at back (stiffest) and work backwards, then you get:

US WRX sedan:
169 lbf/in F
92 lbf/in R

Note how soft the rear is compared to the front, compare to either the rates Jamie Drummond measured for the Aussie WRX and the STI rates.


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