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MS1-Extra

MegaSquirt 1 v2.2 with Toyota
VAST Distributor

Only for use with the MS1 Extra code (MS1 - 68H908 based microprocessors)

By Philip Ringwood (daxtojeiro), James Murrey (jsmcortina) and Ken Calver (muythaibxr)

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.

This document contains a DRAFT information. It should not be used without verifying all details. Return to this document for future updates.

The Ne output of the VAST distributor is fed to the MegaSquirt pin 24 to provide ignition timing.

The MegaSquirt spark control output at pin 25 goes to the VAST distributor IGt
The VAST distributor will in turn then drive a single external coil.

Make the red connections internally in MegaSquirt 1 v2.2 as shown in the PCB drawing above. Fasten all parts and wires to the PCB with RTV to keep from vibrating.

  1. Add a 1k ohm resistor between the right side of D5 and to the banded end of D9 (+12V)
  2. Optional; remove D5 and D8 and replace with a jumper
  3. Connect XG1 to XG2
  4. For 22RE add a 220 ohm resistor (or for MR2 add a 1k ohm resistor) from D17 (the side that goes to Q9) to the +5V connection at the right of R23
  5. From D17 (the side that goes to Q9) connect a wire to X11 (adds connection to pin 25, not shown)

Note: On at least one install the input circuit had to be modified by replacing R10 with a 10k ohm resistor. Please report your experience on the forum.
 

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