EPAC2™ electronic power steering system

EPAC2  Our most powerful system yet


Designed and manufactured in house by precision engineers, our EPAC electronic power steering systems provide a truly exceptional driving experience whilst maintaining the originality of your vehicle. With over 500+ systems supplied and fitted worldwide we are the preferred choice of Aston Martin and classic car specialists.


EPAC is the perfect answer to the age old problem of heavy steering. We’ve been restoring and servicing classic cars for over 40 years so we fully understand the requirements of our customers and their cars.  When we are designing a steering system we firstly engineer it to be more robust than the original, we aim to conceal the system either under the dash or behind shrouds as much as possible so the vehicle appears untouched and once fitted it requires no maintenance.


We make use of sophisticated solid modeling software package to design and engineer every system whilst utilising highly tested components from renowned OEM manufacturers to ensure safety and reliability. Every system also comes with a 3 year return to base warranty in the unlikely event something requires attention.


Our systems are speed sensitive meaning that at low speeds, the assistance offered is greater while at high speed, less assistance is offered. The driver also has the ability to easily fine tune the assistance via a small rotary switch offering five different settings allowing the system to be tailored to suit each and every specific driver.


Key Features


•  Fully Adjustable Speed Sensitive Assistance

•  Powerful Heavy Duty Electric Motor

•  Precision Engineered Components

•  Maintenance Free

•  Concealed

•  3 Year RTB Limited Warranty

•  Bespoke Systems Available On Request

EPAC stands for Electric Power Assisted Column. It is also known as Electric Power Steering (EPS or EPAS). It is the most advanced type of the steering system being used on modern vehicles today. The main purpose of any type of power steering system is to reduce the driver effort required to steer the vehicle i.e. the torque applied on the steering. Unlike a hydraulic power steering system that is continuously driven by a hydraulic pump, the main advantage of electronic power steering is that it powers the assist motor only when necessary. Depending upon the speed of the vehicle, electronic power steering systems also offer variable assist to the steering gear. At low speeds, the assist offered is greater while at high speed, less assistance is offered by the system.


Steering Angle and Torque sensor

The steering angle sensor and torque sensor are responsible for measuring the position of the steering wheel and the torque applied by the driver on the steering wheel respectively. When the steering wheel is turned a small torsion bar inside the unit allows the shaft to twist slightly, deforming a magnetic field. The sensor detects the amount of torque applied by measuring the change in the magnetic field. Basically, the harder the steering wheel is turned, the greater the change in the magnetic field, the greater the power assist.


Assist Motor and Reduction Gear

The assist motor consists of a powerful heavy duty electric motor. The motor is highly efficient so that it puts minimum strain on the vehicle’s electric circuit. The motor is also designed in a way that if it stops working the mechanical linkage between the steering rack and the steering wheel is not affected. A reduction gear is used for the final output from the motor to keep the load on the motor to a minimum whilst getting the work done through minimum electrical load.


Control System

The control system consists of a Vehicle Interface Unit that collects data from various sensors and sends them on to an OEM ECU. The ECU has a set of algorithms that calculates the amount of assist torque required based on steering force, steering angle and the speed of the vehicle which in turn signals the assist motor to apply the appropriate amount of torque to the steering shaft.



The EPAC system has been designed using highly tested components from a world renowned OEM manufacturer to ensure reliability and safety. The ECU constantly monitors operation and in the event a fault is detected by the ECU the system will default to a zero assist state but still allow the vehicle to be driven albeit without steering assistance until the fault can be rectified.



The wiring and control system can be easily hidden away under the dashboard. All our systems are fused by a high amperage in line fuse to the ECU and connected directly to the battery where possible to minimise strain on the vehicle existing wiring. The system operating voltage is 13.8V DC with a typical maximum current draw during normal operation of 30 amps. All systems are available for both positive or negative installations.

Current Applications


Aston Martin DB2/4

Aston Martin DB2 MKIII

Aston Martin DB4

Aston Martin DB5

Aston Martin DB6

Lagonda Rapide


Guide Price £2850 Ex VAT


All EPAC systems are supplied complete with fitting kit, wiring harness, installation guide and any additional hardware that may be required for installation.


We are continually developing our system for other marques and have also installed bespoke systems in classics such as Jaguar XK140 & XK150, Alvis TA & TD21 and Facel Vega HK500 to name a few.


To discuss a conversion for your car or to be notified of future developments and availability please  contact us with your requirements.

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Aston Martin DB2

Aston Martin DB2/4

Aston Martin DB2/4 MKIII


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