Main Index of MS2-Extra Manuals

Layout of Components -- Suggested Supply points -- List of common components and part numbers

Trigger return distributor

Setting up the Distributor -- Wiring mods for Hall Sensors -- Settings

Only available in MS2/Extra 2.x codes.
This is typically used for Hall effect distributors where the code can use both edges of the trigger vane for timing information. The edge of one vane is placed around cranking advance e.g. 10BTDC and is used during cranking, the other edge of the vane is closer to 60BTDC and is used during running.
The MS2/Extra implementation treats this type of trigger like a simple toothed wheel.

Hall or Optical input sensors

Wiring for V3.0 PCB -- Wiring for a V2.2 PCB

V3.0 PCB Wiring:

Hall or Optical input sensor wiring for V2.2 PCB

When hall sensor output is 5V use:

When hall sensor output is 12V use:

Settings

For correct operation it is critical that the Ignition Input Capture, Trigger Angle and Angle between main and return are specified correctly. For assistance in setting attach crank timing tape to your damper and disconnect the coil, then enable "middle LED indicator" on the More Ignition page. Now rotate the engine to 10 Deg BTDC (Assuming this is where you want your cranking advance). Place the vane so the Middle LED just turns off. (see above diagram). Now turn the engine backwards (this is so we keep on the same vane) the LED will come ON imediatley as it will see the vane. Continue to turn it untill the LED goes out again. From the timing tape you can determine the Trigger Angle.

Also make a note of the number of degrees the LED is lit. This is for the Angle between main and return.

Ignition Input Capture Setting:
All Hall sensors we have tested appear to ground the supply when switching. We need to know when it switches the supply down to ground, i.e. when it see's a tooth or when it see's the gap between teeth. To do this, turn the engine backwards until the edge is well out of the Hall sensor. Measure the output voltage from the Hall sensor Turn the engine forward until the edge has passed through the Hall sensor. Measure the output voltage.

If the sensor switches to ground when it sees a tooth and goes high (12 or 5V) when it see's a gap then set the Ignition Input Capture to "Rising Edge"

If the sensor switches to ground when it sees a gap and goes high (12 or 5V) when it see's a tooth then set the Ignition Input Capture to "Falling Edge"

Once the engine is running double check your timing using a strobe. (To fix the angle at say 10deg to make reading it easier set the "Fixed Advance" to Fixed and set the "Timing for Fixed Advance" to 10deg. Change the Fixed Advance to "Use Table" once youve finished!!) If it is out then alter your Trigger Angle untill it is correct.

Suggested points for Supplies inside the V3.0 ECU

Component Pinouts

Pull up circuit diagram

List of component part numbers used in the ignition section:

Please note: Above part numbers will need checking, some components will come with a minimum order in multiples of 5 and 10.

If you have a question, comment, or suggestion for this FAQ please post it on the forum.

No part of this manual may be reproduced or changed without written permission from James Murray, Ken Culver and Philip Ringwood.