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12-12-2001, 01:45 AM | #1 |
Scooby Guru
Member#: 456
Join Date: Oct 1999
Chapter/Region:
NWIC
Location: Redmond, WA, USA
Vehicle:2008 Forester XT Steel Gray Metallic |
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. Believeable? Glenn
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12-12-2001, 11:38 AM | #2 |
Scooby Specialist
Member#: 4431
Join Date: Feb 2001
Chapter/Region:
NWIC
Location: Lynnwood,WA,USA
Vehicle:MY07 STi and '06 WRX Urban Grey & WRC Blue |
Seems really low value for the rear spring rates (what were they thinking?) but believable given the rear end dance the rear does on throttle lift off in a corner!
Also would explain the huge improvement in lift on your car under acceleration |
12-12-2001, 12:12 PM | #3 |
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Join Date: Aug 1999
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Location: Austin, Texas, USA
Vehicle:The 93 W/EJ20K-sold Subaru-less :( |
hmmmmm
169 for the front seems really high the 110-120 #s sound better a differance in the stock spring rates that big would create some intesting handeling if you use the same 101% gain figure with th front you get ~106 .. which i think is closer side note: notice the similarities in the sti/spt spring rates vs the v.5 spring rates (very simmilar) with in ft/lbs |
12-12-2001, 09:21 PM | #4 | |
Scooby Guru
Member#: 456
Join Date: Oct 1999
Chapter/Region:
NWIC
Location: Redmond, WA, USA
Vehicle:2008 Forester XT Steel Gray Metallic |
Quote:
DEFINITELY there is a huge spring rate difference between the front and rear OE springs. The rear is very soft. Glenn |
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12-13-2001, 03:11 AM | #5 |
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Location: Fire Caves
Vehicle:2019 Macan 4cyl 1993 Impreza FWD WRX swap |
Very interesting... Wonder if someone might try to put a pair of the front springs on the back to compensate? (I know it will screw up the geometry, but it might be worth trying to see)
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12-13-2001, 10:40 AM | #6 |
Scooby Guru
Member#: 456
Join Date: Oct 1999
Chapter/Region:
NWIC
Location: Redmond, WA, USA
Vehicle:2008 Forester XT Steel Gray Metallic |
I seem to recall there are diameter differences at the top (or bottom?)
Glenn |
12-13-2001, 12:52 PM | #7 | |
Scooby Specialist
Member#: 4431
Join Date: Feb 2001
Chapter/Region:
NWIC
Location: Lynnwood,WA,USA
Vehicle:MY07 STi and '06 WRX Urban Grey & WRC Blue |
Quote:
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