My installation of the Eibach Pro-kit (part# 38146.140 - 0.8"/0.9" drop)
BEFORE - STOCK with OE wheels/tires
AFTER - Eibach Pro-Kit with OE wheels/tires
AFTER - Eibach Pro-Kit with TSW 20" Interlagos / Toyo Proxes T1R
Eibach aftermarket spring to OEM spring comparison
- Linear single rate spring
- Progressive rate spring
The change to a progressive rate spring translates into a smooth comfortable ride while driving modestly and a stiffer rate will get engaged when driving more aggressively when body wants to roll, dive and squat more. This technology is actually derived from motorsports by stacking springs of different rates to provide the best balance of mechanical grip. The result is having the best of both worlds in one suspension kit.
- 7.00 lbs (front)
- 7.40 lbs (rear)
- 9.20 lbs (front)
- 10.05 lbs (rear)
The OEM springs have increased mass due to the additional coils and heavier coils. To reduce body roll, nose dive and squat a heavier spring rate is required. To lower the center of gravity with a heavier spring rate the working rate of the spring will need to be shorter, however additional coils are required to take up the travel to full droop (to prevent the spring from popping out of its spring perch) and add some progressivity.
(Information derived from an interview with Eibach Suspension)