Ignition System

Ignition System


Ignition Mode

Direct Fire

Selected when there is one ignition coil per cylinder. Eg. If there are 8 cylinders there will be 8 ignition outputs that will be used with a total of 8 ignition coils. Ignition Outputs are to be wired to Cylinder Number (Ignition#1 to Cylinder#1, Ignition#2 to Cylinder#2, etc.), and the Firing Order on the Engine Configuration page is controlling the sequencing.

Wasted Spark

Selected when each ignition coil is supplying spark to 2 cylinders, or when each ignition output is triggering two coils. Eg. If there are 8 cylinders there will be 4 ignition outputs that will be used with a total of 4 ignition coils, or 4 pairs of ignition coils. Ignition Outputs will be fired in sequence and the Firing Order will be ignored.

Distributor

Selected when a distributor is being used to control which cylinder is supplied spark from a single ignition coil. This will have only Ignition#1 wired to a single coil.

Twin Distributor

Selected when two distributors are being used to control which cylinder is supplied spark from two ignition coils. Eg. The Toyota 1UZFE V8 engine has one distributor on each bank of its V8 engine. This will use Ignition#1 for Bank 1, and Ignition#2 for Bank 2.

Single Wire CDI

Selected only when a Haltech Power Select 4, 6, or 8 CDI system is being used. This will use Ignition#1 for the multiplexing signal to the CDI, Ignition#2 for the automated power selection function on a 4-stroke engine, and Ignition#3 for the automated power selection function on a rotary engine


Edge

The output edge which is used to fire the ignition coil at the required time. This is determined by the type of ignition module being used to fire the ignition coil. There is only one correct setting for each ignitor module type and selecting a wrong setting may cause ignitor module and/or ignition coil damage. (Default = Falling)

Falling

When Falling is selected the output will normally be at 0V, will begin charging the ignition coil on the Rising Edge as the output drives to the 'Pull Up Voltage', and fire the coil on the Falling edge as it drops from the 'Pull Up Voltage' to 0V. The amount of time is called the charge time. The Falling edge used by almost all OEM ignition systems, and many aftermarket ignition systems.

Rising

When Rising is selected the output will normally be at the 'Pull Up Voltage', will begin charging the ignition coil on the Falling edge as 0V is output, and fire the coil on the Rising edge as it rises from 0V back to the 'Pull Up Voltage'. This amount of time is called the charge time. The Rising edge is used with some CDI ignition systems designed for points-style ignition, and some OEM Honda distributors.

Trailing Edge

The setting is only used when the Engine Type is set to Rotary. Settings are the same as for Edge and only apply to the outputs controlling Trail ignition coils. Lead coils are controlled by the Edge setting.

Dwell Mode

The ignition coil charging method, determined by the type of ignition module being used. There is only one correct setting for each ignitor module type and selecting a wrong setting may cause ignitor module and/or ignition coil damage. (Default = Constant Charge)

Constant Charge

Selected when the ECU is directly controlling the charge time of the ignition coil. This is used by almost all OEM ignition systems where the ECU is controlling the ignition advance, and can include standalone ignition modules or ignition coils with the module built-in. Selecting Constant Charge will enable a Dwell table with 3D mapping, and adjustment in milliseconds (ms). The value itself is determined by the ignition coil and information on this should be provided by the ignition coil manufacturer.

Constant Duty

Selected when the ignition module is controlling the charge time of the coil. This is used by some CDI ignition systems designed for points-style ignition, and some older OEM ignition modules such as Ford TFI. Selecting Constant Duty will enable the Dwell Duty setting.

Trailing Dwell Mode

The setting is only used when the Engine Type is set to Rotary. Settings are the same as for Dwell Mode and only apply to the outputs controlling Trail ignition coils. Lead coils are controlled by the Dwell Mode setting.

Dwell Duty

The duty at which the ignition output will operate. The value is a percentage (%) of cycle time. Most CDI systems and OEM systems that use Constant Duty will use a value of 50%, and this should be confirmed with the ignition manufacturer before proceeding.

Pull Up Voltage

The voltage that all ignition outputs will be pulled up to, regardless of the function assigned to that output. Default = Battery Voltage.

Time Offset

The time in microseconds that the ECU will advance the timing of the ignition outputs. This is used to compensate for the potential time delay between when the ignition output triggers the coil, and the spark reaching the combustion chamber. Default = 0 microseconds.


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