Godspeed MonoRS Coilover Shock+Spring for Jaguar XJ8 03-09, XJR 04-10 Air to Coil

New in box: Coilover Lowering Kit (Not allow set factory height)

Godspeed MONO-RS Coilover

Application:
Jaguar XJ8 (X350/X356/X358), 04-09
Jaguar XJR (X350/X356/X358), 04-10

Note: Air to Coil Compatible
Note: Electronic suspensions - a warning light will be illuminated for the adaptive damping system but the vehicle will function normally.

Key Features:

• Lowered Ride Height:  Unleash an aggressive look and embrace improved handling like never before. The lowered stance will turn heads wherever you go, while the enhanced aerodynamics will boost your performance on the road and track.
• Precise Rebound Adjustment:  Take control of your suspension with 32 levels of rebound adjustment in the Mono-tube shocks. Fine-tune your driving comfort and performance to match your driving style and conquer any terrain with ease.
• Enhanced Spring Rate:  Experience the thrill of sharper responsiveness and reduced body roll with the upgraded spring rate. Feel more connected to the road and confidently tackle curves and corners with enhanced stability.
• Durable Construction:  The Godspeed Project MonoRS Coilover Damper Kit is crafted with precision using a combination of CNC aluminum components and high-strength carbon steel alloy where needed. This meticulous engineering ensures both robustness and reliability, while the strategic use of carbon steel alloy adds a weight-reducing property, contributing to improved agility and reduced unsprung weight.

Air to Coil Conversion Tips:

1. Damper and Air Pressure Spoofing
Factory air struts feature electronic damping valves and pressure sensors. When the system detects these are missing, it throws a fault.

• The Fix: You need electronic cancellation modules. These are essentially dummy load resistors or CAN bus spoofers wired into the factory harness at each corner to trick the ECU into reading the correct voltage and resistance, making it believe the air struts and electronic dampers are still plugged in and fully pressurized.

2. Ride Height Sensor Calibration
Air suspension systems use mechanical linkage arms attached to the lower control arms to read the vehicle's ride height. This data isn't just used for the air bags; it feeds into the headlight auto-leveling system, traction control, and ABS.

• The Fix: When installing coilovers, you often need to lock these height sensor arms into a fixed, neutral position (using custom brackets or zip-ties in a pinch). If the sensors drop to full droop because the air bag is gone, the car will assume it has suffered a catastrophic suspension collapse.

3. Disabling the Air Compressor
With coilovers installed, the ASM will continuously try to fire up the air compressor to inflate the "missing" air bags, which will eventually burn out the compressor motor.

• The Fix: You must pull the main fuse and relay for the air suspension compressor.

The Software Alternative: CCF Editing

Instead of using physical cancellation modules, the cleanest way to convert a car to coilovers is through software. Using a dealership-level diagnostic tool (like the JLR SDD software for Jaguar/Land Rover platforms), you can dive into the Car Configuration File (CCF).

By editing the CCF, you can completely remove the "Air Suspension" build string and tell the car's network that it rolled off the assembly line with passive coil springs. This disables the ASM entirely, meaning you can bolt on your coilovers, strip out the heavy compressor, air tank, and valve blocks, and never see a dashboard warning light.

The E-Diff Interaction

The XFR is equipped with an active Electronic Differential (E-Diff) that communicates continuously with the Adaptive Dynamics module to vector torque.
If your suspension throws a fault (because you didn't bypass the shocks properly), the car will also restrict the E-Diff's aggressiveness to keep you "safe." Fixing the shock fault via resistors or a CCF edit instantly restores the E-Diff's full locking capabilities.