A dark grey D-Max with a roof rack and a Legendex door decal on red dirt

Performance · stages

Isuzu 4JJ1 3L

Isuzu D-Max 2007–2020 · Isuzu MU-X 2013–2020 · Holden Colorado RC 2008–2012

What this engine has actually gained

One chart per version of the engine, because the same code is not the same job. The years and the vehicle it went into change what it makes standard and what there is to find. Each chart is a single vehicle: a standard run the day it arrived, and the best run after the work, in 4th gear.

3.0L 4JJ1, Holden Colorado RC / RG

2008–2020

Measured on our dyno

Road speed in km/h

Tuned, measured
Standard

83 → 137 kW at the wheels

Hover or tap the chart to read both curves at any speed.

The standard run and the tuned run are one vehicle, measured at the wheels on our own dyno, corrected to DD ATMC3 (factor 1.033), 30°C ambient, 2WD, both in 4th gear.

Best result: +54.8 kW+66.3%

This vehicle’s own before and after, whatever stage it ended up at. It is not a promise for a particular stage, and your 4WD is not this 4WD.

3.0L 4JJ1, D-Max

2007–2020

Measured on our dyno

Road speed in km/h

Tuned, measured
Standard

85 → 132 kW at the wheels

Hover or tap the chart to read both curves at any speed.

The standard run and the tuned run are one vehicle, measured at the wheels on our own dyno, corrected to DD ATMC3 (factor 1.003), 24°C ambient, 2WD, both in 4th gear.

Best result: +46.6 kW+54.6%

This vehicle’s own before and after, whatever stage it ended up at. It is not a promise for a particular stage, and your 4WD is not this 4WD.

3.0L 4JJ1, MU-X

2013–2020

Measured on our dyno

Road speed in km/h

Tuned, measured
Standard

71 → 125 kW at the wheels

Hover or tap the chart to read both curves at any speed.

The standard run and the tuned run are one vehicle, measured at the wheels on our own dyno, corrected to DD ATMC3 (factor 1.002), 29°C ambient, 2WD, both in 4th gear.

Best result: +54.8 kW+77.7%

This vehicle’s own before and after, whatever stage it ended up at. It is not a promise for a particular stage, and your 4WD is not this 4WD.

The stages

Stage 1

adds service, intake clean and tune

from $2,570.00parts, tune and servicing, everything in Stage 1

Get a fitted quote

Service, clean and tune. We service the engine properly, chemically clean the intake and EGR, then tune it to the engine as it actually is on the day: fuel, timing and boost, set on our own dyno.

Most of what you feel is low down, between 1,500 and 2,500 rpm, which is where a loaded 4WD lives on a hill or in sand.

The work in the price

Custom Dyno Tune, Stage 1 and 2$1,250.00
4WD Minor Service$660.00
Intake and EGR chemical clean, single manifold$660.00

Stage 1, 3.0L 4JJ1, Holden Colorado RC / RG

Projected from our own dyno

Road speed in km/h

Tuned, projected
Standard

83 → 110 kW at the wheels

Hover or tap the chart to read both curves at any speed.

The standard run below it is one 3.0L 4JJ1, Holden Colorado RC / RG, measured at the wheels on our own dyno, corrected to DD ATMC3 (factor 1.033), 30°C ambient, 2WD, in 4th gear.

The upper curve is 50% of what that same 4WD gained: the share a calibration carries before the exhaust and the intercooler go on. We dyno a vehicle as it arrives and again when the work is done, never once per stage, so this rung is worked out rather than measured.

Stage 2 Power

would add intercooler and intake, for power

Get a fitted quote

No intercooler, intake or transmission cooler is listed in this stage for the 4JJ1, so there is no Stage 2 Towing either. Ask us. There may be another way to get there.

The work in the price

Custom Dyno Tune, Stage 1 and 2$1,250.00
4WD Minor Service$660.00
Intake and EGR chemical clean, single manifold$660.00

Stage 3

would add high-flow injectors and a bigger turbo

Get a fitted quote

GTurbo publish no injector or turbo step for the 4JJ1. Ask us. There may be another way to get there.

The work in the price

Custom Dyno Tune, Stage 3$1,690.00
4WD Minor Service$660.00
Intake and EGR chemical clean, single manifold$660.00

Stage 4

would add larger injectors and a larger turbo again

Get a fitted quote

GTurbo publish no second injector or turbo step for the 4JJ1. Ask us. There may be another way to get there.

The work in the price

Custom Dyno Tune, Stage 4$2,450.00
4WD Minor Service$660.00
Intake and EGR chemical clean, single manifold$660.00

Before you choose a stage

We will tell you what your build needs to stay road legal before any work starts.

Where to next

Put your rego in the builder. It works out which of these parts fit your vehicle rather than your engine code.
Every dyno result we publish. The other engines and models, same rules.
Suspension and GVM. Power a loaded 4WD cannot put down is power you paid for twice.
Servicing and the intake clean. Stage 1 starts here, and on a high-kilometre engine it has to.
Ask us what yours would do