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MS1-ExtraMegaSquirt v2.2 Distributor Points
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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. |
MegaSquirt requires a pulse from the ignition to syncronize the fuel injection. This sync can be obtained directly from the negative terminal of the ignition coil. No other connections or modifications to the ignition are required.
The above shows the connection and the jumper you need to add internal to the MegaSquirt (shown in green). This will work for most applications. The circuit below is a better way to wire the ignition to minimize any pick up and noise. Zener diode D8 is optional and can be replaced with a short (wire)
You can test your input connection by monitoring IRQ-1 at R11. 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)
