Differences between the 1G and 2G DSM

Differences between the 1G and 2G DSM

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The DSM is the acronym that stands for Diamond Star Motors, the partnership between Mitsubishi, Eagle and Chrysler. Most import enthusiasts have come to know the DSM or Eclipse / Talon / Laser as a very affordable turbocharged 4 cylinder that loves to be modified.

We’ve built and raced these motors for 20 + years now, and while these cars are older, nothing warms our heart like a well built DSM. The legendary 4G63 has had many changes over the years, to finally find itself in the Evolution in 2003. The problem occurs when customers get confused about the differences between the 1G and 2G DSM.

 

This comparison article was first our How To Identify DSM injectors Guide, shown here. These used injectors are great upgrade options for people looking to bolt on a turbocharger kit or supercharger kit.

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The DSM injectors are colored to match the flow and impedance range in question. Here’s a quick breakdown of the available Mitsubishi injectors and the flow they provide.

Pink – 240cc – (1g 2.0L NT)
Tan – 390cc – (1g turbo AUTO)
Blue – 450cc – (1g turbo MT)
Black – 450cc – (2g turbo)
Yellow – 510cc – (Evolution 1-3)
Pink – 560cc – (Evolution 7-9)

These colors can help you identify the flow and exactly what kind of injector you are looking at. You can also use the casting or injector part numbers to get the job done. Here’s a few sets of corresponding part numbers you will need to figure out what you’ve got.

  • Non-Turbo 1.8L – N210H Injectors-casting #INP-057 (210cc High Impedance)
  • Non-Turbo 4G63 – N240H Injectors-casting #INP-059 (240cc High Impedance)
  • Turbo 4G63 A/T – B390L Injectors-casting #INP-008 (390cc Low Impedance)
  • Turbo 4G63 M/T – B450L Injectors-casting #INP-009 (450cc Low Impedance)
  • 2G Turbo BlackTops -MDL450 casting #IPN-081 (450cc Low Impedance)
  • 2.4 – MDH275-casting #IPN-065 (275cc High Impedance)

As this DSM guide has grown, we’ve combined the chart below provided by a good friend of the website John G. Gauthier. This chart helps you identify what the differences are between the year ranges and what parts and components are different.

Year 90 91 92 92.5 93 94 95 96 97 98 99
Generation Early 1G Late 1G Early 2G Late 2G
MAS / MAF Less air flow More air flow
Cam Angle Sensor Yes No Yes
Crank Angle Sensor No Yes
SMIC Larger core, smaller inlet/outlet Smaller core, larger inlet/outlet
BOV Steel Plastic
Throttle Body Elbow Smaller Larger
Throttle Body 60mm 52mm
Intake Manifold Larger Smaller
Cylinder Head Ports Larger, more air flow Smaller, less air flow
Combustion Less efficient More efficient
Fuel Injectors M/T 450cc, A/T 390cc Both 450cc
Fuel Pressure Regulator M/T 36.3psi, A/T 42.7psi Both 43psi
Connecting Rods Big Small
Compression 7.8 : 1 8.5 : 1
Flywheel 6-bolt 7-bolt
Ex. Manifold Less air flow More air flow
Turbo M/T 14B, A/T 13G T-25
O2 Housing Less air flow More air flow
Rear Differential 3-bolt 4-bolt
Suspension System Stronger More agile
ABS (# of channels) One Two Four
Front Calipers Single piston FWD Single piston, AWD Dual piston
Front Rotors 10.2″ FWD 10.2″, AWD 11″
Rear Calipers Single piston * Single piston
Rear Rotors 10.5″ * 10.5″
Emergency Brake Uses the disc brake caliper. Uses a seperate drum brake built into the rotor’s hat.
Rims 16″ FWD 16″, AWD 17″
Oil Cooler Air Water
E-PROM ECU’s Some Most None
Crankwalk Almost completely unheard-of 20% to 35%

* = Some early 1995 rear rotors were larger and vented with different calipers.

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This does it for our Differences between the 1G and 2G DSM Guide, please let us know if you have any questions or comments below!

Submitted by John G. Gauthier and John Huh.

Don’t forget to check out our other DSM articles!

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