1991 Mitsubishi Eclipse GSR-4

 

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

Chassis: stock;

Forced induction: Custom 20G/16G turbo with internal WG and upgraded actuator, 1JZ  FMIC;

Engine: Stock block 4G63;

Injection: Port injection, 560cc/min lowZ EVO 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 the stepper motor idle control valve which was eliminated.

Mods to the PCB included:

• CMP signal pulled up to +5V using 470R resistor and then input to CPU pin 11 through 1k resistor
• CKP signal pulled up to +12V
• D14 pulled to +5V (using RHS of R23) through 1k resistor and then output to PTU for coils 1 & 4
• D16 pulled to +5V (using RHS of R27) through 1k resistor and then output to PTU for coils 2 & 3

Pin configuration with the v3 PCB Megasquirt:

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

Optional connections included:

• Launch control on pin 29 (blue/white) using X13
• Coil output A on pin 27 (blue/white) using X12
• Secondary trigger input on pin 25 (pink) using X11, goes to  DSM pin 22
• Coil output B on pin 31 (brown) using X14 to DSM 55
• Switchable maps on Fidle (using non banded end of D9 to bring out to DB30)

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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