CamSwitch3 – 3D Sequential Camshaft Activation (VVL/VTEC etc)


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Cam Switch 3 – What it does

3D Sequential Cam Activation for up to two camshafts (eg VVL, VTEC) independently

Cam Switch 3 – Inputs

2 x 0-5 volt sensor inputs eg MAP, MAF, TPS, Coolant temp 1 x 0/5 volt timing signal. 1, 2, 3 or 4 spark per revolution input eg smart coil, ECU signal to distributor (Max 5 volt)

Cam Switch 3 – Outputs

2 x Switched 12 volt output, max 3 amp per output. (Solenoids are connected to constant 12v+ source, activation occurs by completing ground circuit.) 2 x 5 volt signal. For external ECUs. Tells your ECU when the cams are activated. 2 x 5 volt sensor power. 0.5 amp Max per sensor.

Cam Switch 3 – Wiring Diagram

The wiring diagram and instructions can be found in the user manual which can be donwloaded in PDF

Cam Switch 3 – How it works

3D sequential & conditional activation of two 12 volt switches. Order of activation “Sensor 1 Theshold” > “RPM” > “Sensor 2 Threshold”. When sensor input is higher than the threshold set, CamSwitch 3 will look at next threshold in chain until all thresholds have been exceeded

Cam Switch 3 – Deactivation

When Sensor 1 threshold or RPM threshold is no longer met for relay 1, both relays are deactivated together  

CamSwitch 3 was designed to activate camshafts on engines which use dual profile camshafts, specifically Nissan’s VVL/Honda VTEC

CamSwitch 3 will trigger any camshaft/s which are switched on or off with a 12 volt source which uses less than 3 amps.


A minimum of one 0-5v sensor

RPM signal 0-5v which occurs 1,2,3 or 4 times an engine revolution.

Android phone with Bluetooth

The Cam Switch 3 Bluetooth App

Knowledge of automotive wiring and mechanical systems.


Q. Do I have to trigger two camshafts?

A. No. If you just need to trigger one camshaft, just connect one camshaft!

Q. Can I use it to activate other things?

A. Sure but you need to familiarise yourself with the way the relays are activated and how they are deactivated. From an electrical point of view the maximum current draw for the relays in 3 amps per relay, 5 amps total. Download the instruction manual for more information.

Q. Do I need to connect my phone to the Cam Switch 3 every time I use the Cam Switch 3?

A. Absolutely not! Connecting to your phone is only for adjusting the trigger settings and to troubleshoot.

99.999% of the time the Cam Switch 3 is a fit and forget device. Wire it up, tune your engine to find the optimum settings and your done, no need to do anything with it until you want to change your settings.

Q. I only need to trigger the camshaft using RPM and one 5 volt sensor signal. Is that possible?

A. Absolutely. Set the trigger threshold for Sensor 2 to zero. If the sensor value for Sensor 2 is bouncing around unacceptably connect the Sensor 1 signal to Sensor 1 and Sensor 2 input on the Cam Switch unit.


Example Usage

Activation Conditions

-Camshaft 1 activation at 30% MAP sensor signal & over 5000 rpm & coolant temp sensor over 70% signal

-Camshaft 2 activation at 30% MAP sensor signal & over 5500 rpm & coolant temp sensor over 70% signal

-Delay timer set to 1 second


Deactivation for both camshafts will happen at the same time one second after MAP sensor signal drops below 30% MAP or RPM drops below 5000rpm.


Cam Switch 3 – Colours

There are two indicator bars at the top of the app. These bars expand when the relay is activated. The left bar is Relay 1/intake cam. The right bar is Relay 2/exhaust cam. The colour of the bars can be changed through the options menu. (See the instruction manual)

Cam Switch 3 – Names

Default names are Relay 1, Relay 2, Sensor 1 and Sensor 2. These names can be changed in the Options Menu.

Cam Switch 3 – Test Relays

You can test the activation of the cams without the engine running.

Enter the options menu and choose the “Test Relays” option. This will disable the activation of the camshafts in normal engine running (so don’t forget to close the “Test Relay” menu when your testing is complete).

If the colours of the buttons are not changing, click the “Read Sensors” button again.



Unit power 12-24 volts with 1 amp inline fuse (fuse not included)

2 x 5 volt sensor inputs

1 x 5 volt timing signal. 1,2,3 or 4 sparks per engine revolution


2 x 12 volt output with 5 amp inline fuse on positive (fuse not included). Permanent 12 volt to solenoid/motor, switch on negative side.\

2 x 5 volt output. For external sensors eg you want to use a MAP sensor but engine does not have one. 0.5 amp current draw maximum per sensor.


This video shows the process of setting up your cam switch points. The interface is from the CamSwitch1.

The CamSwitch3 interface is slightly different but the principles are the same

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