Haltech Generic Duty Map

[Brian MP5T]

Background:

Belt Driven Water Pump turns at the Speed Of the Engine. The time you need it the most (Stopped at a Light) it is turning the least. The Time when you need it the least, (Blasting down the highway with full air passing the radiator) it is at maximum.

A water pump robs HORSEPOWER, it is a Draw on the crank through the Belt.
A alternator robs HORSEPOWER, it is a Draw on the crank through the Belt.

An Electric Water Pump robs the same as belt driven Water Pump unless... it is only on as much as needed.

A normal cooling system has a thermostat to allow the engine to maintain a set temperature. The coolant is always flowing very quickly and as required the thermostat opens to let some cool off in the rad. If the engine gets hotter, more coolant is passed through the radiator.

MP5T:

Has No Thermostat or Heater Core.
100% Of the coolant must travel through the radiator.
normally that would mean that the car would never reach an operating temperature unless it was very very warm outside.

The Haltech knows what the engine temperature is and can control an output known as a Digital Pulsed Output. (Duty Cycle)

It is a variable output based on a table.

I am using the speed of the pump to replace the thermostat.

Every ounce of power that can go to the wheels will go there and only what electricity is required to run the coolant pump will.

It also lets me unload the pump in times of extreme throttle position (When I am Accelerating hard, less power is used by the pump and more is allowed to go to the wheels)

A Screen capture of ECU Management. This Map is what I designed to control the Electric Cooling System in the Mazda Protege 5 Turbo. It Has TPS and CTS as X and Y. The Z is the Pump Duty Cycle. If there is a large application of Throttle, the pump reduces in speed leaving more HP to make the car move. Once the acceleration is done, the pump returns to normal. The Large hump seen in the near area is to check the pump before starting the car. I can turn on the ignition and push the TPS to 20% with the engine cold. This should make the pump run up to 60% and clear out any air trapped in the system before the car is started.







Edit: An alternate application is what was done for real world driving. Once the engine passes above 15 PSI, the pump goes to Full Duty. Because the pump can flow three times more coolant than stock, it is easily able to put massive cooling into the engine to offset the heat that is about to be dumped into the cooling system.

It is about CONTROL