Terry Shepherd Tuning

Electronics

Most modern engines now feature engine management systems, including fuel injection, and when an engine is modified for increased performance, it will usually require re-mapping or re-calibration to achieve the best results. This can be done in several ways, the two most popular being:

  • The system may be a self-adjusting (Closed Loop) system. This means that the Electronic Control Unit (ECU) is programmed to use the input of sensors fitted in the exhaust system to modify the ignition curve or amount of fuel injected. It may also be possible to insert an after-market unit into the wiring loom which modifies the commands issued by the ECU. An example unit used with this method is the Power Commander from Dynojet. This conversion costs from £225.00 plus programming work and vat, depending on the hardware requirements, but may not be ideal for a fully tuned racing engine, as its adjustment capabilities are limited.


  • Alternatively, a new ECU can be fitted into the system. This replaces the original component, accepting input from the original sensors and is fully programmable in all functions. Such an ECU may include the use of aftermarket sensors, and could possibly use the input from appropriate sensors in the exhaust to convert the system into a closed loop, self-adjusting system when suitably programmed. Such an installation will generally cost around £2000.00 or more, including a modified wiring loom and will be the most effective for a fully tuned racing engine.

We can supply the most cost effective solutions for any engine, including alternative throttle bodies, injectors, and pressure regulators as required. We can convert carburetted engines to a fully managed EFI system for either road or racing and will be happy to provide a quote for any system. We can also make wiring looms to MilSpec standards for ultimate reliability. In our experience, electrical faults can almost always be traced to poor wiring looms.