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.
- Add a 1k ohm resistor between the right side of D5 and to the banded
end of D9 (+12V)
- Optional; remove D5 and D8 and replace with a jumper
- Connect XG1 to XG2
- 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
- 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.