Acculight Ignition Systems Help (Version 2) Click on Spyke Logo to return spyke1.com home page. Home Index Wiring Installation

About Sensors and Ignition Curves- A drop down list can be selected to display various ignitions curves based on the sensor state. There is one unique advance curve available for each sensor state. There can be up to four different sensor states and thus four different advance curve graphs.  If None is selected as one of the sensors only 2 curves are available and if None is selected for both sensors you will only have 1 curve graph. It is important to understand that each sensor state can have a unique Rev. Limit, Rpm 1 & 2 Start/Stop RPM, Number of Transitions, Number of Sparks, Number of Transitions and Notes section.

Digital sensors can have either a grounded (tied to negative of the battery) or ungrounded state (not tied to negative of the battery). When the status field says "Digital" it means that sensor is configured as a digital sensor.

Analog sensor values are limited to a range of 0-4 Volts in 1/10 volt increments. The voltage in the sensor status field represents the transition point between the activation of the two advance curve graphs created for each sensor. One graph for cases when the voltage is greater than or equal ( > ) to the transition voltage and one when the voltage is less ( < ) than the spark advance transition voltage.

Note: These are examples and are not necessarily recommend for any specific engine.

Sensor State  Sensor 1             Sensor 2 Grounded            Grounded	Example Uses for Sensors: Some Possible Analog Sensor Uses - A variable voltage map sensor can initiate curve changes based on a set point that can be adjusted across the whole range of engine vacuum.  A variable voltage temperature sensor could be used to improve cold starting (putting the ignition in triple spark) or limiting engine RPM when the engine is cold.  The temperature at which the curve transitions can be varied in software by changing the transition voltage. Some Possible Digital Sensor Uses-  An engine temperature switch can control timing and lower the Rev. limit until the engine reaches operating temperature. A manifold vacuum switch (VOES) can be used to change timing under low vacuum situations.  A relay hooked to a nitrous oxide solenoid that when grounded or ungrounded can select a NOS curve. A manual switch can be used to select a desired timing curve by the operator. The graphs to the left have both sensors configured as digital.
Sensor State Sensor 1                Sensor 2   Grounded            Ungrounded
Sensor State    Sensor 1               Sensor 2 Ungrounded            Grounded
Sensor State    Sensor 1                 Sensor 2   Ungrounded            Ungrounded