Quote:
Originally Posted by norcalpb
How are you liking that spring rate? I imagine it’s similar to the oem STi springs which would mean we have another oem+ option on our hands. Did you notice a drop at all when you did your Traction mod?
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F 2.7k BRZ springs
R 3.4k MY17 -> 4.0k GR86 springs
FSB 18mm stock
RSB 15mm Impreza or MY17
The ride height changes with loads are manageable. Before installing the Traction Mode, I was worried about the saggy butt with loads, since my rear diffuser has a small gap from the parking lot stoppers. The up-rated rear springs make it manageable.
After installing the Traction Mode, I noticed a squat angle on launches, but it disappears quickly. I think the springs suppress the squat angle.
The ride comfort is the same or softer even with the up-rated springs. But the stock Sachs dampers (from MY17) sometimes fail to dampen the oscillations from the road surface at a certain frequency (usually high freq.).
The rear is more responsive but not too much. I guess it would be too rear-biased if I used those springs without the Traction Mode. I like the current settings.
Without a spare tire or a jack in the trunk, the static ride height was not changed or only slightly changed. But the ride height changes when loaded are almost the same even with the up-rated rear springs. It means that just sitting in the driver seat could make it lower than before without changing the spring rate.
Before the installation:
After installing 4.0k springs at the rear and the Traction Mode.
