The factory M139 Quattroporte suspension, particularly the early Skyhook system, is now an aging platform often compromised by component wear and potential electronic failures. The ASM Engineering Coilover System is a comprehensive, direct-fit solution engineered to replace every critical component, restoring and radically enhancing the chassis dynamics of your Quattroporte.
Developed through years of obsessive setup and R&D on Maserati transaxle platforms, this kit is built on a modular philosophy. This allows us to provide a system with precision-tuned handling characteristics while ensuring every individual component is fully serviceable. This design improves performance while representing a significant upgrade in long-term serviceability over the OEM "sealed" units.
This is a complete bolt-on conversion, replacing all four dampers, springs, top mounts, and lower bushes.
Key Dynamic Improvements
Installation of the ASM system provides a quantifiable transformation in handling fidelity:
- Improved Turn-In: Delivers significantly more positive front-axle response and stability.
- Reduced Brake Dive: Chassis dive under hard braking is dramatically reduced, maintaining platform stability.
- Enhanced Rear Traction: Improves rear-end tracking and stability, especially in long, sweeping high-speed turns.
- Superior Yaw Control: Optimizes the car's ability to manage weight transfer in rapid transitions (e.g., switchbacks, winding roads).
- Full Adjustability: Complete ride height control, from OEM to aggressive lowering, independent of spring preload.
Technical Specifications
- 30-Way Damping Adjustment: Manual mono-tube damper adjustment, easily accessible from the engine bay (front) and trunk (rear).
- Independent Ride Height: Full-tap threaded body allows ride height to be set without compressing the spring, preserving damper stroke and ride quality at any height.
- Serviceable Design: All parts are available individually. The system is designed for straightforward disassembly and long-term maintenance.
- Precision Top Mounts: Engineered for durability and precise feedback.
- High-Durability Lower Bushes: Replaces the failure-prone OEM lower bushes.
System Variants: Select Your Profile
We have engineered two distinct valving and spring-rate profiles to cover 90% of owner requirements.
Variant 1: GT (Grand Touring)
This kit is the ideal solution for owners seeking to restore and improve upon the factory Sport GT feel. It is engineered to provide OEM-level comfort comparable to the standard "Sport" mode or the Bilstein GTS suspension, but with vastly superior body control and handling precision.
- Application: DuoSelect & ZF Automatic
- Profile: The perfect go-to for repairing a worn factory suspension while gaining a significant performance advantage.
Variant 2: GTS (Grand Touring Sport)
This is our high-performance configuration. With firmer spring rates and a revised damping bias, the GTS kit is aimed squarely at exploiting the M139's transaxle layout for maximum driver engagement. It is designed to deliver handling characteristics similar to a GranTurismo MC. While comfortable for long-distance highway use, its performance focus is more evident on rough roads.
- Application: Primarily recommended for DuoSelect models to maximize transaxle chassis dynamics.
- Profile: For the owner who prioritizes ultimate handling response and a "connected-to-the-road" feel.
Available Options & Upgrades
- Skyhook Delete Kit: An essential electronic module that integrates with the factory ECU to eliminate any dash warning lights from the removal of the original electronic suspension.
- Hydraulic Lift System: An optional front-axle lift system, similar to the factory option on Ferrari and Lamborghini, for navigating steep driveways and obstacles. (Please inquire for lead time and pricing).