Supercharge Mitsubishi Pajero/Montero 6G72

[Tracy Macgrady]

The Mitsubishi has various models of their full size SUV are using 6G72 engine. This model of motor has been in the market for more than 20 years, way back to the early Dakar racing. There are still large amount of pajeros on road running this engine, v6 3000cc displacement with 12-valve and 24-valve version. The engine is durable but in general lack of power. The 3.0L engine yields about 147 horse power by the spec.

My Montero has ran 400K millage, it still behaves as it should. Along the engine rebuild, I decide to supercharge the engine with a Toyota SC14 supercharger, let’s see how it goes.

6 steps in general,

1. Do the math, it gives you a theoretical validation of what I try to achieve.
2. Mounting, to put the supercharger mount on the engine, and put on the right pullet and bells.
3. Piping put on all kind of hose to connect the supercharger to the intake and air filter.
4. Build the supercharger controller circuit, which includes a microcontroller with a step motor driver, supercharger clutch control, and all kind of input signals (RPM, TPS and etc).
5. Write a small piece of software to control the air bypass valve (ABV) and supercharger clutch when the accelating pedal is pressed at the right RPM.
6. Tuning, with different parameters of opening the ABV and engage the supercharger at different RPM and TPS angles.


I bought a SC14 supercharger from a junk yard, it’s easy to aquire and with a reasonable price.





the SC14 has 1420cc on 1 cycle, the 3000cc engine would suck in 1500cc with 1 cycle of cranking， therefore the SC14 would have to rotate slightly faster than the crank to fill in the same amount of air as it is running as a natural aspirated engine. When we try to boost the engine, we would definitely want to pump in more air with the supercharger. As I want to make a quick test, I used the original pullet, driving the supercharger with the wheel that drives the power steering. I measure the diameter of the driving pullet has 1.2 timers bigger than the pullet on the supercharger, so it should work, I decided to start from there.

[Tracy Macgrady]

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[Tracy Macgrady]

[Tracy Macgrady]

The mounting was not so difficult, but still take quite a while, as you need to it the mounting on and off to manipulate the position and make the supercharger fit in the engine bay

[Tracy Macgrady]

one the mounting is done, I started to piping and connect the hose in between the intake ,supercharge, air filter and the ABV. I bought a air filter case of the jeep Cherokee, and it’s cheap and narrow enough to fit in the engine bay. Of course, I still need to modify the tube to fit in the airflow sensor.

[Tracy Macgrady]

eventually it looks okay…


I bought and trimmed a 135-degree aluminum tube into 2 pieces, one on the intake side, one on the airfilter size, fully utilized.


I disassembly the supercharger, it’s pretty simple indeed. Two fly wheels with two air blades, 4 bearings and a magnetic clutch, that’s the SC14 all about.