Toyota FJ Cruiser 4.0L Supercharger Kit: 39% More Power from the 1GR Engine
FJ Cruiser 4.0L Supercharger Kit: 39% More Power
Quick Summary: The Toyota FJ Cruiser's 1GR-FE 4.0L V6 produces 272hp from the factory — enough for stock driving, but not enough once you add larger tyres, bumpers, and recovery gear. The VT Eaton TVS1320 supercharger kit pushes that to a dyno-tested 379hp and 541Nm, a 39% horsepower and 42% torque increase, through a bolt-on installation that preserves your factory cooling system.
Why the Stock 1GR-FE Runs Out of Power
Toyota's 1GR-FE is a 4.0-litre dual-overhead-cam V6 that has powered the FJ Cruiser since its launch. In factory trim it makes 272hp and 380Nm — respectable for a naturally aspirated platform, but numbers that show their limits fast in real-world conditions.
Owners who fit 285/65 R17 all-terrain tyres, steel bumpers, roof racks, and recovery gear know the problem. The added mass and drag eat into available power. Highway overtakes, steep hill climbs, and high-altitude trails expose the gap between what the engine delivers and what the vehicle demands.
The 1GR-FE's bottom end is well-engineered. A cast-iron block and forged crankshaft handle additional stress comfortably. That engineering headroom is exactly why forced induction works so well on this platform — unlike bolt-on NA modifications that yield marginal gains at best.
VT Eaton TVS1320 Supercharger Kit
VT now uses the Eaton TVS (Twin Vortices Series) platform across all Toyota 3.5L and 4.0L supercharger kits. The FJ Cruiser kit is built around the Eaton TVS1320 supercharger — a positive-displacement, roots-type blower with four-lobe rotors that deliver consistent, linear boost from just above idle to redline.
Unlike turbochargers that depend on exhaust gas velocity to spool, the TVS1320 is mechanically driven from the crankshaft. Boost is available the instant you open the throttle. No lag, no power band to wait for, no sudden torque surge that breaks traction on loose surfaces.
What's in the Kit
The Toyota FJ Cruiser 4.0 VT Supercharger Kit includes the complete hardware package for a bolt-on installation:
- Eaton TVS1320 supercharger unit with 3-year Eaton warranty
- Water-cooled intercooler system — reduces intake charge temperatures for consistent power
- Dedicated oil cooling system — maintains supercharger lubrication independent of engine oil
- CNC-machined mounting brackets — engineered for the FJ Cruiser engine bay
- Belt drive system — complete serpentine arrangement with tensioner
- Silicone hoses and clamps — high-temperature-rated throughout
Dyno-Tested Results
All figures below were recorded on a chassis dynamometer with the FJ Cruiser running on 285/65 R17 all-terrain tyres — the same rubber most owners use, not stripped-down road tyres that would flatter the numbers.
| Metric | Stock 1GR-FE | With TVS1320 Kit | Gain |
|---|---|---|---|
| Horsepower | 272 hp | 379 hp | +107 hp (+39%) |
| Torque | 380 Nm | 541 Nm | +161 Nm (+42%) |
The 42% torque increase matters most for FJ Cruiser owners. Torque pulls you up sand dunes, through deep ruts, and past slower traffic without downshifting. The additional 161Nm transforms the driving experience in ways that intake and exhaust modifications cannot replicate.
Installation and Cooling Design
The VT kit is a true bolt-on system. No cutting, welding, or permanent modification to the chassis or engine. The factory cooling system, intake routing, and accessory drive layout are all preserved.
Water-Cooled Intercooler
Compressing air generates heat, and hot intake air reduces power and increases detonation risk. The VT kit uses a dedicated water-cooled intercooler circuit. Coolant flows through the intercooler core, pulling heat from the compressed charge before it enters the manifold. This is more compact than a front-mounted air-to-air intercooler and doesn't require cutting the bumper or blocking airflow to the radiator — critical for slow-speed off-road conditions where airflow is minimal.
Dedicated Oil Cooling
The TVS1320 has its own oil supply separate from the engine oil. The kit includes a dedicated oil cooling system to maintain optimal lubricant temperatures regardless of ambient conditions or sustained high-load driving.
Factory Cooling Preserved
The stock radiator, thermostat, and cooling fans remain untouched. The supercharger's cooling systems operate independently, so factory engine cooling capacity is fully retained.
Key Benefits
- 39% more horsepower, 42% more torque — dyno-verified on AT tyres in real-world configuration
- Linear power delivery — positive-displacement design provides progressive, predictable boost with no turbo lag
- Instant throttle response — mechanically driven boost available from just off idle
- Strong low-end torque — additional 161Nm available low in the rev range where off-road driving demands it
- High-altitude stability — the supercharger compensates for reduced air density at elevation
- Bolt-on installation — no cutting, welding, or permanent modification
- Independent cooling — water-cooled intercooler and dedicated oil cooling operate without burdening factory systems
- 3-year Eaton warranty — the supercharger core is backed by Eaton's own coverage
For owners exploring alternatives, VT also offers the Toyota FJ Cruiser V6/4.0 HKS Supercharger Kit as another forced induction option for the 1GR-FE.
Frequently Asked Questions
Will the kit work with my existing lift and tyre setup?
Yes. The VT kit was dyno-tested on 285/65 R17 AT tyres, reflecting a common FJ Cruiser build. It mounts within the existing engine bay and does not interfere with suspension, body, or tyre modifications. The additional torque is particularly beneficial for vehicles running larger, heavier tyres.
Is ECU tuning included?
No. ECU tuning is not included and must be sourced separately. This is intentional — the calibration needs to account for your fuel type, altitude, and other modifications. A tailored tune ensures optimal power, fuel economy, and engine protection.
Does the supercharger affect reliability for off-road use?
The kit preserves the 1GR-FE's durability. Factory cooling remains untouched while the supercharger operates with its own independent water-cooled intercooler and oil cooling. The Eaton TVS1320 is backed by a 3-year warranty and requires minimal maintenance.
How does it perform at high altitude?
This is one of the biggest advantages over staying naturally aspirated. At altitude, air density drops and NA engines lose power proportionally. The TVS1320 compensates by mechanically forcing a greater volume of air into the cylinders, maintaining power where a stock engine would struggle.
What's the difference between the VT and HKS kits?
VT standardises on the Eaton TVS platform for all Toyota 3.5L and 4.0L applications. The VT Eaton TVS1320 kit features water-cooled intercooling and dedicated oil cooling. The HKS kit uses HKS's own supercharger design. Both are bolt-on systems for the 1GR-FE.
Related 1GR-FE Supercharger Kits
The FJ Cruiser shares the 1GR-FE engine with several Toyota and Lexus models. VT offers kits for the full 4.0L family: