Tecomotive "tinyCWA"

The controller for the Pierburg CWA type water pumps


  • Engine speed independent cooling
  • Integrated cooling fan controller
  • No more overheating at engine idle
  • No thermostat necessary
  • Quick and predictive control algorithm
  • Delayed shutdown
  • LED warning system and safety functions
  • New: PWM fan control (Mercedes/SPAL/etc.)

An automotive controller for Pierburg’s electric water pumps
CWP35 / CWA50 / CWA100 / CWA150 / CWA200 / CWA400

... used by many OEM's such as BMW, Audi, VW, Porsche, Mercedes Benz ...

The Tecomotive “tinyCWA” is able to control all CWA type electric water pumps (eWP) in the appropriate manner.
It is suitable for cars or any other thing where smart cooling is required.

When activated the controller is measuring the current coolant temperature and the rate of increase with the connected
temperature sensor.
With this data it then calculates the appropriate water flow and sends a signal to the pump where the internal pump electronics then set it to the right speed. This way you will always have the right pump speed for any circumstances.

We developed this product with very special attention to quality, operational safety, ease of use and a very nice appearance.

The compact and robust case measures only 45x45x12mm. (1.77x1.77x1/2inches)

You can find more precise information about the operation, installation and use in the manual linked below.


Information:

Features:

  • Simple to set up with only one rotary switch
  • Choose your favorite target temperature from 15°C to 100°C (59°F to 212°F)
  • LED display shows the current pump speed or rough coolant temperature
  • Compact and robust case
  • Relay output for the radiator fan (optional to use)
  • Delayed shutdown of the pump and the fan after ignition turned off
  • Manually control the pump speed (e.g. for bleeding or testing)
  • LED warning system and various safety features

New:

  • New EV operating mode
  • Improved temperature indication via the LED
    • (The middle LED now corresponds to the selected target temperature)
  • PWM fan control
    • (Mercedes/SPAL/etc.)
  • Possibility to choose between several sensor characteristics
    • (to use your own temperature sensor)
    More on this in the current manual.

Contents:

  • tinyCWA controller
  • Fuse holder
  • Fuses (7,5A/15A/20A/40A)
  • Connector 8 pin (controller)
  • Connector 3/4 pin (water pump) (standard: for a CWA200 pump)
  • Connector 2 pin (temperature sensor)
  • Temperature sensor with M12x1.5 thread size
  • Interchangeable backplate with mounting holes


Download:

(Current operating instructions)
Tecomotive "tinyCWA" manual (pdf)

3D CAD files:
tinyCWA 3D CAD (zip)

(Archive)
Older manuals


The electric water pumps from Pierburg

The Pierburg CWA200 was one of the first electric water pump for line production introduced by BMW in 2004.
They and others are now widely available in the aftermarket and got many advantages over conventional mechanical pumps.
Some of which are the freedom of installation and the independence of engine revolutions.
Also the pumps are very well built and with its brushless canned motor they are practical maintenance free.

Pierburg CWA50

Name: "Pierburg CWA50"
Supply voltage: 8-16 Volt
Current consumption: max. 6,5A in operation and 0,2mA in standby mode
Differential pressure: 0.55 bar
Flow rate: 25l/min @ 0.6bar / 35l/min @ 0.3bar
Protection: IP67
Part numbers: Pierburg - 7.06033.11.0 / 7.06033.15.0 / 7.06033.44.0 / 7.06033.31.0
BMW: 11517566335 // Audi: 4F0965569 / 8K0965569 // VW: 7P0965567 // Porsche: 95860656700

Pierburg CWA100

Name: "Pierburg CWA100"
Supply voltage: 8-16 Volt
Current consumption: max. 13,5A in operation and 0,2mA in standby mode
Differential pressure: 0.85 bar
Flow rate: 30l/min @ 0.85bar / 40l/min @ 0.65bar
Protection: IP67
Part numbers: Pierburg - 7.06754.05.0 // Mercedes: A 000 500 04 86

Pierburg CWA150

Name: "Pierburg CWA150"
Supply voltage: 9-16 Volt
Current consumption: 15A max. / (I < 100mA in standby mode)
Differential pressure: ≥ 1.40 bar *
Flow rate: approx. 25 l/min @ 1.40bar / 40 l/min @ 0.80bar
Protection: IP54
Part numbers: Pierburg - 7.09578.00.0 // VW: 4KE965567B

Pierburg CWA200

Name: "Pierburg CWA200"
Supply voltage: 8-16 Volt
Current consumption: max. 16,5A in operation and 0,2mA in standby mode
Differential pressure: 0.45 bar
Flow rate: 116l/min @ 0.45bar / 166l/min @ 0.30bar
Protection: IP67
Part numbers: Pierburg - 7.02851.20.8 / 7.00294.17.0 / 7.02478.40.0
BMW: 11517586924 / 11517586925 / 11517586929

Pierburg CWA400

Name: "Pierburg CWA400"
Supply voltage: 8-16 Volt
Current consumption: max. 36A in operation and 0,2mA in standby mode
Differential pressure: 0.85 bar
Flow rate: 150l/min @ 0.85bar / 220l/min @ 0.55bar
Protection: IP67
Part numbers: 7.03665.66.0 / 7.02881.66.0 // BMW: 11517604027 / 11517596763


Advantages of electric water pumps:

The best benefit for aftermarket and motorsport application would be the freedom of installation and use.
You can mount the pump practically anywhere (yes even in the trunk) and it is completely independent of the engines revolutions.

Most of the cooling power is needed when the car is idling around in a complete standstill.
Sadly that’s the situation where a mechanical water pump got its least amount of power.
So most of the time a conventional pump is oversupplying the engine with coolant flow.

The eWP however can deliver the right amount of flow at any time it is needed.
(Only of course with the right controller that regulates the power in a smart and efficient way) ;-)


Pump supply:

We will gladly provide you with a pump in addition to the controller.
Just write us an email in this matter or take a look at our online store. :-)

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