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MS1-ExtraMegaSquirt v3.0 Crane XR700 IgnitionOnly for use with the MS1 Extra code (MS1 - 68H908 based microprocessors) By Philip Ringwood (daxtojeiro), James Murrey (jsmcortina) and Ken Calver (muythaibxr) |
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Please Note:
All of these instructions / diagrams are to be used at your own risk, like most things there is more than one way to do the same thing, what we have tried to do is to offer a method that we have tested or that others have tested for us. No warranty expressed or implied. Use at your own risk. |
Below is the wiring for the Crane optical trigger driving the MegaSquirt ECU. Only the optical trigger of the Crane XR700 is required. The amplifier/coil driver is not needed since MegaSquirt v3 has its own coil driver. Add a 510 ohm 1 watt resistor to MegaSquirt as shown in green. Alternately change R12 to 1k ohm and connnect Optoin to +12V. Make all the other green jumper connections as shown.
You can test your input connection by monitoring IRQ-1 at R13. First set up MS to monitor IRQ with the center front panel LED. Disconnect power to the coil. Put on the hand brake and the car in neutral. Now turn the engine such that the crank pulley passes from 20º BTDC to TDC. The IRQ LED should go from On to OFF at ~10º BTDC for most cars with distributor (but it may be from 5º to 15º, usually this is called the static timing)
If you don't have the Crane XR700 ignition, you can purchase the optical trigger and shutter. The optical trigger and shutter look like this. On the left is the mounting plate with the optical trigger and a free standing shutter, on the right is an assembled distributor.
Using the optical trigger as a rpm and position indicator, MegaSquirt then drives a single coil for ignition.
