Flex
FLEX 4JJ3 F55 Turbo Bolt-On
FLEX 4JJ3 F55 Turbo Bolt-On
Regular price
$1,999.00 AUD
Regular price
$2,250.00 AUD
Sale price
$1,999.00 AUD
Unit price
per
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FLEX 4JJ3 F55 Turbo Bolt-On
High-Performance Bolt-On Turbo for 4JJ3 | Bigger Inlet (3.25") | Free Express AU Shipping
🧩 Product Overview
Unlock serious performance with the FLEX 4JJ3 F55 Turbo Upgrade. Built as a bolt-on for 4JJ3 platforms, this unit is engineered to support high boost targets while maintaining strong response. Ideal for tuned builds with the right supporting mods.
🔧 Suits
- Isuzu D-MAX – 4JJ3-TCX (2020-on)
- Isuzu MU-X – 4JJ3-TCX (2020-on)
- Mazda BT-50 – 4JJ3-TCX (2020-on)
Direct bolt-on to 4JJ3 manifold. Intake inlet is 3.25", adapter/coupler required to suit your intake pipe.
📊 Key Specs
- Compressor wheel: 48.5 mm (6/6)
- Turbine wheel: 48.5 mm (11-blade)
- Inlet size: 3.25" (larger than OEM)
- Boost capability: ~35–40 psi (build/tune dependent)
- Power potential: up to ~340 rwhp with tuning & supporting mods
📦 What’s Included
- FLEX 4JJ3 F55 Turbocharger
- Wastegate actuator
- Turbo inlet gasket
- Oil drain tube & gasket
- Oil feed line with turbo feed bolt
🛠️ Install Notes
- Oil drain: Trim the factory drain and join to supplied drain tube with the included oil-rated hose.
- Intake: 3.25" turbo inlet will require additional adapter/coupler to suit your intake pipe.
- Tuning required to achieve safe fuelling and EGT control.
- DPF-equipped vehicles may require custom dump/exhaust adaptations. Ensure all modifications comply with local laws. Emissions tampering may be illegal on public roads; intended for off-road/competition use where applicable.
- Other supporting mods may be required to fully utilise this turbo.
💳 Payment & 🚚 Shipping
- 💳 Afterpay, Humm, Klarna & Zip available
- ✈️ Free Express Shipping Australia-Wide — fast, trackable dispatch
Frequently Asked Questions
Do I need an ECU tune after fitting this turbo?
Yes. A professional remap is strongly recommended to set safe boost, rail pressure and fuelling, and to get the best performance.
Will this bolt to the factory manifold and lines?
Yes, it’s designed for the 4JJ3 manifold pattern. The turbo inlet is larger (3.25"), so you’ll need an adapter/coupler for your intake pipe.
What supporting mods do you recommend?
Front-mount intercooler, high-flow intake and exhaust, quality monitoring (boost/EGT), and injectors/fuel system as required for your power goal.
How much boost should I run?
Typical tuned builds run ~35 psi. Higher targets up to ~40 psi are possible with appropriate hardware and careful tuning—follow your tuner’s advice.
Is this suitable for daily driving and towing?
Yes—when tuned correctly and paired with the right cooling and exhaust, it offers responsive midrange and reliable performance for daily use and towing.
