Haltech E8 - Manual (Page 54)

Haltech E11/E8 Instruction Manual
• RPM Threshold - A/C output is disabled when the engine speed exceeds this RPM. This is to
prevent over revving the air con compressor on some high performance engines.
• Time Interval (s) - In order to prevent the A/C compressor from making rapid transitions with rapid
changes in throttle, the minimum time interval between on and off transitions can be specified
here.
See the Digital Inputs section for information on how to setup the input required for Air Conditioning
control to function.
Alternator Control (Mazda)
Some Mazda alternators require a PWM actuated signal to maintain a steady output voltage. This feature
allows the ECU to control the PWM output to achieve the desired alternator output voltage
Actual alternator control values from a NB Mazda Miata MX5:
Figure 49
• Frequency – The frequency required to control the given alternator.
• Start Duty Cycle – This duty cycle will be run when the engine is cranking, this is also the duty
cycle that the controller starts the control process at.
• Gain – Controls the sensitivity of the control system, the larger the gain the larger the change in
duty when there is an error between the actual battery voltage and the desired battery voltage.
• Target Voltage – Sets the target output voltage of the system.
• Min Duty – The minimum duty cycle the control system will output.
• Max Duty - The minimum duty cycle the control system will output.
Aux Fuel Pump
Running two fuels pumps continuously, or a single very large flow-rate pump means excessive noise and
heating of the fuel. A street vehicle with very high potential output will not need a large fuel supply at all
times. The second pump would only be activated when load demands require that the extra flow be
available.
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Note : The extra fuel pump cannot be driven directly by the ECU. The ECU can
be made to drive a relay to power the pump.