Upgrading to electric power steering (EPS) dramatically improves drivability in classic vehicles and EV conversions. This 800-word guide covers everything from model-specific adaptations to detailed installation steps and troubleshooting.
Vehicle-Specific Preparation
For Classic Car Applications
Older vehicles often require custom solutions. You’ll need to fabricate or source adapter brackets to mount the EPS motor to your existing steering column. Pay special attention to clearance issues in cramped engine bays, and ensure the additional weight (typically 8-15 lbs) won’t affect your suspension geometry.
For EV Conversions
Modern electric vehicles demand careful power system integration. Verify your EPS kit’s voltage requirements match your battery system (common options include 12V, 24V, or 48V). The controller should be mounted in a well-ventilated area protected from moisture, with wiring routed away from high-voltage cables to prevent interference.
Step-by-Step Installation Process
Essential Tools Checklist
Gather these before starting:
– Metric and SAE wrench sets
– Digital multi meter for electrical testing
– Torque wrench (30-50 ft-lbs capacity)
– Angle grinder (for bracket modifications)
– Wire strippers and heat shrink tubing
– Thread locking compound
Mechanical Installation
Begin by completely disconnecting your battery. Remove the steering wheel and any existing hydraulic components if present. Mount the EPS motor using the provided brackets, applying threadlocker to all fasteners. The motor should align perfectly with your steering shaft – even slight misalignment can cause vibration or premature wear.
For the control unit, choose a location protected from heat and moisture. Under-dash mounting works well for most applications, but EV conversions may require near-battery placement for optimal wiring runs.
Electrical Connections
Proper wiring is crucial for reliable operation:
- Connect motor leads to the controller using the supplied harness
- Run power directly to the battery with an inline fuse (typically 40A)
- Install the torque sensor between the steering wheel and motor
- Ground all components to the same point on the chassis
For high-voltage EV systems, add a DC-DC converter if needed to step down to your EPS kit’s required voltage. Always double-check polarity before powering up the system.
Testing and Calibration
After installation:
- Reconnect the battery and turn the ignition to “ON”
- Verify the controller’s status lights indicate normal operation
- Slowly turn the steering wheel lock-to-lock to check for binding
- Take a low-speed test drive to evaluate assist levels
Most systems allow adjusting steering effort through:
– DIP switches on the controller
– Bluetooth-connected mobile apps
– Manual potentiometer adjustment
Troubleshooting Common EPS Issues
When encountering steering stiffness, begin by verifying your battery maintains proper voltage (minimum 10.5V for 12V systems). Check all power and ground connections at the battery, controller, and motor. Clean any corrosion and ensure terminals are tightly secured. If voltage drops during steering inputs, test your alternator’s output and consider upgrading wiring if undersized.
Electrical noises like whining or buzzing usually point to grounding problems. Inspect all ground points for clean metal contact and proper tightness. Adding supplemental ground straps between the chassis, engine, and steering components often resolves these issues. For high-pitched electrical noise, install ferrite chokes on power wires near the controller.
Intermittent operation frequently stems from wiring issues. Carefully examine the entire harness for:
– Chafed or pinched wires
– Loose connector terminals
– Corroded contacts
Pay special attention to areas near moving components or sharp edges.
Warning lights indicate sensor-related faults. Most quality EPS kits feature diagnostic LEDs that flash error codes in specific patterns. Common codes include:
– Torque sensor calibration errors
– Motor circuit faults
– Over-temperature conditions
– Communication failures
Always consult your specific manual for code definitions and reset procedures. Many sensor-related warnings can be cleared by recalibrating the system or reseating connectors. For persistent faults, verify sensor alignment and wiring integrity before considering replacement.
Remember that some steering issues may originate from mechanical problems rather than the EPS system itself. Before extensive troubleshooting, verify your tires, suspension components, and wheel alignment are in proper condition.
Maintenance and Product Recommendations
Plan to inspect all mounting hardware and electrical connections every 3-6 months. The CMVTE EPS Pro kit stands out for its robust construction and adjustable assist curves, making it ideal for both classic cars and EV conversions. Their 24V version works particularly well with modern electric vehicle electrical systems.
For optimal longevity, keep the motor and controller clean and dry. Consider applying dielectric grease to all electrical connectors in humid climates. Some advanced systems offer firmware updates that can improve performance – check the manufacturer’s website periodically.
Final Thoughts
A properly installed EPS system transforms the driving experience, offering precise control with minimal effort. While the installation requires mechanical and electrical skills, the result is well worth the effort. Always follow the manufacturer’s instructions precisely, and don’t hesitate to consult a professional if you encounter challenges beyond your expertise. With careful installation and proper maintenance, your EPS system should provide years of trouble-free operation. Checking out EPS page and select suitable EPS for your vehicles.
https://cmvte.com/product-category/eps-ehps/
