Mitsubishi Galant VR4

1991 Mitsubishi Galant VR4

16VT’s involvement: Wired in plug and play Megasquirt to control fuel and ignition. Calibrated to suit.

Chassis: stock;

Forced induction: Precision GT3582RLE with internal WG and DSM flange, 780x330x76 mm core FMIC;

Engine: 2.3L stroker kit, 4G63 engine code, ARP head studs, Manley connecting rods with ARP rod bolts, JE forged 8.5CR 86mm pistons;

Injection: Port injection, 1000cc/min lowZ PTE injectors at stock FPR, DSM coolant and GM intake temp sensors, DSM wastespark coilpack with external ignitor;

Description: The objective of this install was to use the original wiring loom with the Megasquirt. To do this, an old DSM ECU was cannibalised and turned into an adapter. All the original sensors and actuators were used, with the exception of a the stepper motor idle control valve.

Mods to the PCB included:

CMP signal pulled up to +5V using 470R resistor and then input to CPU JS8 through 1k resistor
CKP signal pulled up to +12V
D14 pulled to +5V through 1k resistor and then output to PTU for coils 1 & 4
D16 pulled to +5V through 1k resistor and then output to PTU for coils 2 & 3

Pin configuration with the v3 PCB Megasquirt:

MS GROUNDS (8,9,10,11) go to 101, 104, 106 (black)
MS SENSOR GROUNDS (19) go to 17, 24 (black)
MS MAT (20) goes to 8 (red/black)
MS CLT (21) goes to 20 (yellow)
MS TPS SIGNAL (22) goes to 19 (blue)
MS O2 SENSOR SIGNAL (23) goes to 4 (blue)
MS PIN 24 to primary tach input CKP pin 21 (blue)
MS TPS Vref (26) goes to 23 (white)
MS coil control (Coil A) goes to 54 (brown)
MS +12V (28 ) goes to 110, 13, 11, 102 (red)
MS FIDLE (30) wired up externally (lime yellow)
MS INJ1 (32,33) goes to 51, 61 (yellow)
MS INJ2 (34,35) goes to 52, 60 (green)
MS FUEL PUMP (37) goes to 56 (green)

Optional connections included:

Launch control on pin 3 (SPR1) (yellow)
Switchable tables, pin 4 (SPR2) (blue)
General purpose 'Output 2', pin 5 (SPR3) (green) using PN2222
Secondary tach input, pin 25 (IAC1A) goes to 22 (green)
Nitrous, pin 27 (IAC1B) (pink) using PN2222
Shift light (output 1), (pin 29, IAC2A) was fed to warning light 64 (white) using ztx450
Additional coil driver (coil B), pin 31 (IAC2B) (lime yellow)

Unused ECU connections included:

VSS on 18 (pink)
MPI control relay on 63,66 (not wired up)
Wastegate control on 105 (not wired up)
AC relay on 65 (lime yellow)
AC switch on 7 (blue)

Crank signal was decoded using MSnS-E HR 10d code. Trigger angle 73. Trigger position A was 1, Trig pos B 2.

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