Product Details
The Swift Spec-R Lowering Springs for the 2017-2020 Honda Civic Si (FC1/FC3) give the 10th-gen Si a sportier stance and sharper handling that the turbocharged 1.5L platform is more than capable of using. These FC1/FC3 Civic Si lowering springs deliver an approximate 1.1" front and 1.1" rear drop with spring rates of 4.1 Kg/mm front and 5.7 Kg/mm rear, engineered to work with the Si's adaptive dampers. Built in Japan from Swift's proprietary H5S.TW spring steel, these Civic Si springs reduce body roll and improve cornering confidence for autocross events, HPDE track days, and spirited daily driving.
Swift Spec-R Technology
- Proprietary H5S.TW high-tensile spring steel, manufactured in Japan
- Optimized ride height to maximize suspension geometry at lowered position
- Increased spring rates tuned to usable shock stroke for balanced performance
- Fewer coils reduce unsprung mass and completely eliminate coil bind
- Quicker transient response for improved traction and road feedback
- Vehicle-specific bump rubber engineering to prevent bottoming out
Features
- Track-proven in HPDE and SCCA competition
- Lowered center of gravity for improved cornering grip
- Reduced body roll and sharper handling response
- Comfortable enough for daily driving
- Compatible with OEM and aftermarket shocks/struts
- Direct bolt-on installation with no modifications required
Specifications
| Part Number | 4H918R |
| Part Name | Swift Spec-R Lowering Springs |
| Vehicle | 2017-2020 Honda Civic Si |
| Chassis Code | FC1/FC3 |
| Spring Rate - Front | 4.1 Kg/mm |
| Spring Rate - Rear | 5.7 Kg/mm |
| Approximate Drop - Front | 1.1" |
| Approximate Drop - Rear | 1.1" |
Vehicle Fitment
- 2017 Honda Civic Si (FC1/FC3)
- 2018 Honda Civic Si (FC1/FC3)
- 2019 Honda Civic Si (FC1/FC3)
- 2020 Honda Civic Si (FC1/FC3)