GT4 Performance Springs


GT4 Swift Spring upgrade kit:

Upgrade your stock springs to 448lb in front and 560lbs in the rear! These spring rates have shown to reduce camber loss during cornering and can improve tire wear while on track. Fortunately the factory OEM shocks are capable of handling these stiffer springs without the need to revalve. Stiffer spring rates are also needed to handle higher aerodynamic loads. These springs will help compensate for the increased loads. 

This Swift Springs upgrade Kit includes 2 front springs and 2 rear springs along with helper springs for the rear. We chose to use a longer front spring without helper springs so we can increase the amount of usable stroke in the front suspension by 1/2" when compared to other spring kits for the GT4. 

Swift's innovative designs have made us a staple in the performance tuning world. Our products are the result of over 90 years of experience in industrial spring manufacturing. Our engineers have spent countless hours developing and re-developing our springs, in order to create a product that is light, durable, and compliant, while still maintaining linear spring rates.

Many enthusiasts will swap springs from brand to brand with the only noticeable difference being a stiffer or softer ride. But what if a spring could offer a noticeable increase in traction, smoother weight transfer, better ride quality, lower tire temperatures, and a more predictable feel? The engineers at Swift have taken that "what if" and turned it into reality.

All Swift Springs are manufactured using( H5S.TW.) which is far superior to silicone chrome steel and allows us to wind our springs with less coils, resulting in reduced un-sprung weight and increased stroke.

3D Scanning & Prototyping

Each DBJ product goes through several rigorous design phases. Starting from scratch, we collect high accuracy scanned data from cars to ensure great fitment. Data is then processed and models and designs are created using CAD software. Prototyping using 3D rapid prototyping printers are used to confirm scans and fitment. Sometimes we are able to print out entirely functional parts for road and track testing. 

Computational Fluid Dynamics

Initial designs are tested using both finite element analysis (FEA) and computation fluid dynamics (CFD). Both these methods require several iterations to ensure proper performance and optimization of DBJ parts. 

Real world testing

Finally once the design is completed, we test our prototypes on the street and track! Thoroughly test driving our products helps ensure that our customers have nothing but the best experiences when it comes to installation and performance results.