Evo I/II/III Engine and Drivetrain

Cooking a turbo, best served hot

Mitsubishi Lancer Evolution I was introduced in October 1992.

Engine Specs:
    * Engine - 4G63T -in-line 4-cylinder, 16-valve DOHC.
    * Bore/Stroke 85.0/88.0mm
    * Compression 8.5:1
    * Displacement 1,997cc
    * Standard Power - 250 Bhp
    * Standard Torque - 228 ft/lb

Drivetrain Specs:
    * Type - Full-time 4WD with Centre Viscous Coupling Unit
    * Gearbox - 5 Speed Manual - with or without Front LSD
    * Gear Ratios -
      1st 2.571
      2nd 1.600
      3rd 1.160
      4th 0.862
      5th 0.617
      Reverse 3.166
      Final Ratio 5.433
    * Clutch Type - Single Dry-Plate with Diaphragm Spring

Mitsubishi Lancer Evolution II was introduced in January 1994.
(My engine is this one!)
Engine Specs:
    * Engine - 4G63T -in-line 4-cylinder, 16-valve DOHC.
    * Bore/Stroke 85.0/88.0mm
    * Compression 8.5:1
    * Displacement 1,997cc
    * Standard Power - 260 Bhp
    * Standard Torque - 228 ft/lb

Drivetrain Specs:
    * Type - Full-time 4WD with Centre Viscous Coupling Unit
    * Gearbox - 5 Speed Manual - with or without Front LSD
    * Gear Ratios -
      1st 2.570
      2nd 1.684
      3rd 1.160
      4th 0.862
      5th 0.617
      Reverse 3.166
      Final Ratio 5.433
    * Clutch Type - Single Dry-Plate with Diaphragm Spring

Mitsubishi Lancer Evolution III was introduced in January 1995.
Engine Specs:
    * Engine - 4G63T -in-line 4-cylinder, 16-valve DOHC.
    * Bore/Stroke 85.0/88.0mm
    * Compression 8.8:1
    * Displacement 1,997cc
    * Standard Power - 270 Bhp
    * Standard Torque - 228 ft/lb

Drivetrain Specs:
    * Type - Full-time 4WD with Centre Viscous Coupling Unit
    * Gearbox - 5 Speed Manual - with or without Front LSD
    * Gear Ratios -
      1st 2.570
      2nd 1.684
      3rd 1.160
      4th 0.862
      5th 0.617
      Reverse 3.166
      Final Ratio 5.358
    * Clutch Type - Single Dry-Plate with Diaphragm Spring

(Source: www.evo123.net)

NOTES

1. Evo I and II has a lower engine compression than Evo III (8.5:1 vs 8.8:1)

2. Internal actuator spring rate for Evo I/II/III is 72 Kpa or 0.7 bar (14.7 PSI)- Stock boost

3. Safe maximum boost for Evo I and II with stock internal is 1.2 bar and for Evo III is 1.0 bar (due to higher engine compression). Just make sure you have necessary supporting parts to increase the boost (e.g. Wideband tuning, Walbro high-pressure 255lph fuel pump).

4. Evo I/II/III is using Viscous Limited Slip Differential (VLSD) for the front

5. Evo I/II/III stock bottom end's is good up to 350 whp before it starts breaking up. Get it forged if you want to go more than 350 whp safely although some people managed to run 500 whp on stock internals, very2 risky though.

Currently, I am running at 0.7 bar on low boost setting and 1.0 bar for high boost setting although sometimes it creep up to 1.65 bar due to my 3" turbo-back exhaust piping (especially during cold night).

Turbo boost is now engaged!

Scramble boost set to increase another 0.2 bar for 11 seconds in case I need an extra push for extraordinary occasion, *grin*.