Omex 200 Ignition Management System

• Distributorless ignition for up to 4 cylinders
• Single coil distributor ignition for up to 8 cylinders
• Supports twin plug systems
• Programmable load and speed sites
• TPS or MAP can be used for main load sensing
• Wide range of crank trigger patterns are suitable (user programmable)
• Security protected calibrations
• Inbuilt ignition rev limiter (with programmable soft and hard cuts)
• Tachometer and shift light outputs
• Magnetic or Hall Effect crank sensors
• Automatic interpolation between mapped sites
• Programmable battery compensation and RPM compensation for dwell times
• Scatter spark ignition advance for engine idle when cold (and stable idle when warm)
• User settable ignition retard based on air temperature
• User settable ignition retard based on coolant temperature
• Separate start advance for cranking provides easy starting for high compression engines
• Maximum recommended engine speed 12500rpm
• Weight less than 400g
• High strength aluminium case for physical and electrical protection
• All ignition drivers inbuilt for reliability and cost
• AND LOADS MORE

Engine Speed and position is read from a pattern of teeth on the crank. Most manufacturers patterns are already known such as Ford 36-1, Bosch 60-2, Rover (18-1 twice and late K series), Toyota 36-2 etc If using an engine without a crank trigger pattern, an external trigger wheel can be fitted. The trigger wheel is a general-purpose part and will require machining to fit the crank pulley with the crank position sensor mounted facing it.

The ECU needs an input of engine load. The Omex ECU can use an input of either throttle position or manifold absolute pressure (MAP). Most normally aspirated engines will use an input of throttle position as this gives excellent throttle response. Forced induction engines need to use MAP as there is no direct relationship between throttle angle and engine load due to the variable of boost pressure. However, forced induction still requires throttle position sensor (TPS) input for idle condition information.

Omex stocks a variety of different throttle position sensors to suit different carburettors. Many are supplied with a mounting bracket to allow them to be fitted with no modifications.

The ECU needs an input of engine load. The Omex ECU can use an input of either throttle position or manifold absolute pressure (MAP). Most normally aspirated engines will use an input of throttle position as this gives excellent throttle response. Forced induction engines need to use MAP as there is no direct relationship between throttle angle and engine load due to the variable of boost pressure. However, forced induction still requires throttle position sensor (TPS) input for idle condition information. In some cases a MAP sensor can be used on a normally aspirated engine for load.

The rating of MAP sensors is absolute, not boost pressure. Therefore a 2bar sensor is for up to 1bar boost and a 3bar for up to 2bar boost. Normally aspirated engines if using manifold pressure for load would use a 1bar sensor.

The coolant temperature sensor is used to give user definable ignition retard based on coolant temperature. The input from the coolant temperature sensor can be user calibrated in the ECU software allowing nearly all standard sensors to be used. Omex can supply a sensor with a known calibration if required.

The air temperature sensor is used to give user definable ignition retard based on inlet air temperature. The input from the air temperature sensor can be user calibrated in the ECU software allowing nearly all standard sensors to be used. Omex can supply a sensor with a known calibration if required.

The ECU can control either a single coil with distributor or a DIS (wasted spark) coil pack. If using the single coil, the distributor is used simply to point the sparks to the correct cylinder, not for any timing information.

A dedicated shift light output allows an LED or bulb to be set to light at a user definable engine speed to indicate the optimum gearshift point. Omex can supply a 5mm or 10mm ultrabright LED with mounting bezel.

An adjustable frequency output allows most tachos to be controlled by the ECU.

The 200 series ECU can have any of its parameters (inputs, outputs, and all the calculations in between) recorded whilst connected live to a PC. The results of this logging can be viewed using the analysis tool DATA2000.