SAK Turbo
4JJ3 44mm Turbo Upgrade - SAK Turbo
4JJ3 44mm Turbo Upgrade - SAK Turbo
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SAK 44mm Gated Bolt-On Turbo for the 4JJ3-TCX
Isuzu D-MAX, Isuzu MU-X and Mazda BT-50 (2020 on)
The SAK 44mm is the proven 4JJ3 turbo upgrade for D-MAX, MU-X and BT-50 owners chasing strong mid-range torque without giving up response. It bolts straight to the factory 4JJ3 exhaust manifold, runs an external wastegate actuator, and comfortably supports tuned street and touring builds well beyond what the stock unit can move.
Specifications
| SAK 44mm 4JJ3 Bolt-On Turbo | |
|---|---|
| Engine | Isuzu 4JJ3-TCX 3.0L turbo diesel |
| Vehicles | Isuzu D-MAX (2020 on), Isuzu MU-X (2020 on), Mazda BT-50 (2020 on) |
| Compressor | 44mm, 6/6 blade |
| Turbine | 11 blade |
| Flange | Stock 4JJ3 manifold pattern, direct bolt-on |
| Rear housing | Size 12 standard (small and large A/R available to order) |
| Control | External wastegate actuator (gated) |
| Boost capability | Approx 30 to 40 psi, build and tune dependent |
| Power range | Approx 240 to 280 rwhp with tuning and supporting mods |
| In the box | SAK 44mm turbocharger, wastegate actuator, oil feed line with banjos and copper washers, oil drain fitting with hose and clamps, gasket set |
Details
Fitment Notes
Suits the 4JJ3-TCX platform only: D-MAX, MU-X and BT-50 from 2020 on. It mounts directly to the OEM exhaust manifold with no manifold change required. Running a 4JJ1? The 44mm can be adapted to DPF 4JJ1 models with a custom exhaust, so message us with your VIN and we will confirm the right option for your vehicle.
Installation Notes
- The factory turbo oil drain hose must be cut to length and joined to the supplied drain pipe.
- A professional ECU remap is required to set safe boost, rail pressure and fuelling, and to actually realise the gains.
- DPF-equipped vehicles may require custom dump or exhaust adaptations.
Ensure all modifications comply with your local laws. On-road emissions tampering may be illegal. Intended for off-road and competition use where applicable.
Which Turbo Suits My Build?
The SAK 44mm is the response-focused option: quick spool, strong mid-range, ideal for touring, towing and tuned daily builds in the 240 to 280 rwhp range. Chasing bigger top-end numbers? The FLEX F55 turbo for 4JJ3 runs larger 48.5mm wheels and supports up to around 300 rwhp on well-supported builds. Not sure which way to go? Send us your power goal and mod list and we will point you at the right unit.
Warranty & Returns
Covered under our standard warranty and Australian Consumer Law. Full terms are in our Refund, Returns & Warranty Policy.
Shipping
Free express shipping Australia wide with tracked dispatch. See our Shipping Policy for details. Afterpay, Humm, Klarna and Zip are available at checkout.
Frequently Asked Questions
Will the SAK 44mm bolt straight onto a stock 4JJ3?
Yes. It is designed for the stock 4JJ3 manifold pattern and reuses most factory locations. Minor oil feed, drain and intake adjustments may be needed depending on your setup.
Do I need an ECU tune after a 4JJ3 turbo upgrade?
Yes. A professional remap is required to set safe boost, rail pressure and fuelling targets. Without a tune you will not see the gains and you risk unsafe EGTs.
How much power does the SAK 44mm support?
Typical tuned builds land around 240 to 280 rwhp with supporting mods such as an upgraded intercooler, high-flow intake and exhaust, and appropriate injectors at the upper end.
What boost should I run?
Typical tuned setups see around 30 to 35 psi. Targets up to about 40 psi are possible on well-supported builds. Always follow your tuner's guidance.
Does this suit 4JJ1 models?
This listing targets the 4JJ3 (2020 on). It can be adapted to DPF 4JJ1 models with a custom exhaust. Message us with your VIN for the correct 4JJ1 options.
