Quote:
Originally Posted by John_01
Rear springs aren't too difficult to upgrade. I previously had BMW performance springs and swapped some rear coilover springs with higher rates. I'm using HPA height adjuster and some spring pad adapters to fit the 65mm ID springs.
Front springs are harder. E92 Non-M spring should be possible, though M3 springs won't fit as the spring perch diameter is different. I'm using the BMW performance front springs with matching bump stops.
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I think the 201 lbs front spring are my real issue, leading to the body lean. Swift purposely designed the Spec-R with relatively low rate (soft) within the dampening limits of the crappy OE 1-serie shocks.
The highest rate Spec-R spring application is for the F82/M4 platform at 279 lbs/in and 726 lbs/in. I assume the electronic dampers (EDC system) can handle a little more spring rate ...