The ECU's EGR solenoid output can be used to control aftermarket systems instead of the stock EGR valve. Such systems include nitrous oxide systems and water or alcohol injection systems.
The ECU's EGR output provides a switch to ground when activated. This is a low current ground which must not be used to drive aftermarket solenoids and such directly. Rather, higher current devices should be driven via a relay which can be switched on/off by the ECU's EGR output. Refer to the examples on our website (wiki) for more information.
Enable user-defined settings allows the ECU to control the EGR based on the user-defined parameters below.
When Enable user-defined Settings is not checked, Enable normal (factory) settings permits normal factory operation of the EGR. Check the Enable normal (factory) settings checkbox only when the stock EGR solenoid is connected to the ECU's EGR output.
If something other than the factory EGR solenoid is wired to the ECU's EGR output, uncheck the Enable normal (factory) settings checkbox to prevent inadvertent activation of whatever device is connected. For example, if the EGR output is used to control a nitrous oxide system, inadvertent activation can lead to an explosion in the intake manifold or an unintended engine output-power increase. Similarly, when used to control water or alcohol injection, inadvertent activation can result in hydro-locking the engine.
When user-defined settings are enabled, Activate above specifies the rpm above which activation of the ECU's EGR output is permitted (provided that the rpm is below the but below rpm).
but below specifies the rpm above which the ECU's EGR output will not activate.
When user-defined settings are enabled, And TPS above specifies the throttle position above which activation of the ECU's EGR output is permitted.
When user-defined settings are enabled, And speed above specifies the throttle position above which activation of the ECU's EGR output is permitted.
When user-defined settings are enabled, And knock below specifies the amount of knock below which activation of the ECU's EGR output is permitted. This is particularly useful in shutting off a nitrous oxide system if the ECU sees excessive knock indicated by the engine's knock sensor.
Retard timing by specifies the number of degrees that ignition timing will be retarded when the user-defined EGR output activates. This is particularly useful for retarding ignition timing when the ECU's EGR output is used to control a nitrous oxide system.
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