Kinugawa TD06H-25G 8cm 4" Anti-Surge Turbo for Toyota Land Cruiser 1HD-T / 1HD-FT / 1HD-FTE – 350–380HP

The Kinugawa TD06H-25G 8cm 4-inch Anti-Surge Turbocharger is the largest turbo in the OFM4x4 Kinugawa Land Cruiser 1HD range and is designed for high-output Toyota 1HD-T, 1HD-FT and 1HD-FTE 4.2-litre turbo diesel applications.

Kinugawa currently rates this TD06H-25G configuration for approximately 350–380HP crank / flywheel power for diesel applications. It combines a large 60.5 / 78.0mm 25G compressor wheel with a substantially larger 58.8 / 67.2mm TD06H turbine wheel and an 8cm / A/R .57 turbine housing.

Unlike the smaller 3-inch Kinugawa Land Cruiser turbos in this range, the TD06H-25G uses a dedicated 4-inch Anti-Surge compressor housing. The Anti-Surge housing is standard on this model and is not currently offered with a Non Anti-Surge housing option.

The TD06H-25G also provides a choice of Oil & Water Cooling or Oil Cooling, allowing the centre housing configuration to be selected according to the vehicle build and installation requirements.

Power Capability: 350–380HP potential crank / flywheel power

Recommended Use: Extreme-performance, motorsport, competition and heavily modified high-output Land Cruiser builds.

Engine Compatibility: Toyota 1HD-T / 1HD-FT / 1HD-FTE 4.2L Turbo Diesel

Compressor Housing: 4-inch Anti-Surge

Cooling Options: Oil & Water Cooled or Oil Cooled

Important: Turbocharger horsepower capability is not a guaranteed engine output. Actual performance depends on engine condition, fuel delivery, boost pressure, intercooling, intake and exhaust flow, engine specification and professional tuning.

Choose the Right Kinugawa Turbo for Your Land Cruiser

OFM4x4 offers six Kinugawa performance turbochargers for Toyota Land Cruiser 1HD diesel engines, covering responsive daily-driver upgrades through to serious high-output builds.

The TD06H-25G should not be viewed simply as “one step above” the TD05H-18K based purely on horsepower. The two turbos have different characteristics. The TD06H-25G uses a significantly larger TD06H turbine and 8cm housing, making it particularly suitable where increased exhaust-flow capacity and reduced restriction at high load are priorities.

Why Choose the TD06H-25G?

The TD06H-25G differs substantially from every other turbo in this six-product Land Cruiser range.

The smaller options use the TD05H turbine family and predominantly 7cm turbine housings. The 25G moves to the substantially larger TD06H turbine assembly, together with an 8cm / A/R .57 turbine housing and large 4-inch Anti-Surge compressor cover.

This configuration is particularly relevant for engines operating at sustained high load and high exhaust flow.

• 350–380HP potential crank / flywheel capability
• Large TD06H turbine architecture
• 60.5 / 78.0mm 25G compressor wheel
• 58.8 / 67.2mm TD06H turbine wheel
• 8cm / A/R .57 turbine housing
• 4-inch Anti-Surge compressor inlet
• A/R .60 compressor housing
• CT26-style 4-bolt turbine inlet
• CT26-style 4-bolt turbine outlet
• Internal wastegate
• Oil-only or Oil & Water cooling options
• Multiple compressor wheel options
• Multiple turbine wheel configurations
• Multiple actuator spring pressures
• Journal bearing with 360-degree performance thrust bearing

Engine & Vehicle Compatibility

Toyota Land Cruiser 80 Series – 1HD-T & 1HD-FT

Kinugawa specifically lists the TD06H-25G for 1991–1997 Toyota Land Cruiser HDJ80 / HDJ81 / HDJ82 models equipped with the 1HD-T or 1HD-FT 4.2-litre turbo diesel.

It is designed as a performance replacement / upgrade for Toyota turbo references:

• 17201-17010
• 17201-17030

The turbine housing retains the Toyota CT26-style flange configuration, allowing it to bolt to the compatible factory exhaust manifold and dump pipe despite the substantially larger TD06H rotating assembly.

1HD-FTE Compatibility

The TD06H-25G is also intended for compatible Toyota 1HD-FTE applications.

For vehicles using Toyota turbo reference 17201-17040, applicable vehicles include:

• Toyota Land Cruiser HDJ78
• Toyota Land Cruiser HDJ79
• Toyota Land Cruiser HDJ100
• Toyota Land Cruiser HDJ105 / applicable converted installations

Kinugawa advises confirming the compressor housing requirement for these installations. This TD06H-25G is supplied around the large 4-inch Anti-Surge compressor housing, and intake arrangements must be suitable for the 4-inch inlet.

If ordering for a 1HD-FTE application, please confirm the vehicle model and existing turbo arrangement so the installation requirements can be checked.

Technical Specifications

Available Configuration Options

The TD06H-25G has a different configuration menu from the smaller Kinugawa Land Cruiser turbochargers.

The 4-inch Anti-Surge compressor housing is standard and is not currently shown with a Non Anti-Surge alternative. The selectable options are instead focused on cooling type, compressor wheel, turbine wheel and actuator pressure.

Compressor Housing

4-inch Anti-Surge – Standard / Fixed Configuration

The TD06H-25G uses a large A/R .60 Anti-Surge compressor housing with a 4-inch inlet.

Unlike the 3-inch TD05H products, there is no current Anti-Surge / Non Anti-Surge housing selection for this product. The Anti-Surge housing is part of the defining specification of this TD06H-25G.

Compressor Wheel Options

• Cast 6+6
• Billet 6+6 – focused towards stronger low-end torque
• Billet 11+0 – focused towards stronger top-end speed and airflow

The TD06H-25G compressor wheel measures approximately 60.5 / 78.0mm.

The Billet 6+6 configuration is particularly relevant where response and torque delivery remain important, while the Billet 11+0 configuration is intended to favour higher-speed compressor airflow.

Turbine Wheel Options

The current Kinugawa product configurator provides the following selectable turbine-wheel choices:

• 12 Blades STD
• 9 Blades STS
• 10 Blades STS 55

The TD06H turbine wheel measures approximately 58.8 / 67.2mm.

Turbine wheel selection affects rotating inertia, exhaust-flow capacity, turbine efficiency and spool characteristics.

Cooling Type Options

• Oil & Water Cooled
• Oil Cooled

This is an important difference from the previous five turbochargers in this Land Cruiser range.

The customer can select either the traditional Oil & Water Cooled centre housing arrangement or an Oil-Cooled configuration.

The correct choice depends on the vehicle installation, cooling-line arrangement and build requirements.

Spring / Actuator Pressure Options

The standard actuator setting is:

1.0 bar / 14.7 PSI – Default

Alternative actuator pressures available include:

• 0.3 bar
• 0.5 bar
• 0.8 bar
• 1.0 bar – Default
• 1.2 bar
• 1.5 bar
• 1.7 bar
• 2.0 bar

Important: Actuator pressure must be selected according to the intended boost target, engine specification and boost-control strategy. A stronger actuator spring does not automatically provide safe additional horsepower.

60.5 / 78mm 25G Compressor

The TD06H-25G uses the largest compressor wheel in this six-product Kinugawa Land Cruiser range.

At approximately 60.5mm inducer / 78mm exducer, it is substantially larger than the compressors used on the TD05H models.

This provides the airflow capacity required for high-output 1HD engine builds while the available compressor-wheel designs allow the turbo to be tailored further towards either torque response or top-end airflow.

Large TD06H Turbine – 58.8 / 67.2mm

One of the most important differences between the TD06H-25G and the previous five turbochargers is the substantially larger turbine wheel.

The TD06H turbine measures approximately 58.8 / 67.2mm, providing significantly greater exhaust-flow capacity than the TD05H turbine family used by the smaller turbochargers.

This can be particularly beneficial on high-output diesel engines operating at sustained boost and high exhaust mass flow, where reducing turbine-side restriction becomes increasingly important.

8cm / A/R .57 Turbine Housing

The TD06H-25G uses an 8cm / A/R .57 turbine housing.

This is another major difference from the 7cm / A/R .49 housing used on the smaller TD05H products.

Kinugawa identifies the 8cm / A/R .57 nozzle area as being equivalent to the referenced stock CT26 turbine housing size.

The larger housing provides greater turbine-side flow capacity than the 7cm configuration, which becomes increasingly important as engine power and exhaust flow rise.

Why TD06H Instead of TD05H?

As engine output increases, the exhaust side of the turbocharger becomes just as important as compressor airflow.

A turbine that is too restrictive can increase:

• Exhaust manifold pressure
• Exhaust gas temperature
• Pumping losses
• Thermal load
• Restriction at high engine speed

The TD06H-25G addresses this by moving to a substantially larger turbine wheel and larger 8cm housing.

For this reason, the TD06H-25G can make sense even where its published horsepower rating overlaps with the TD05H-18K. The two turbochargers achieve their performance using very different compressor and turbine combinations.

4-Inch Anti-Surge Compressor Housing

The TD06H-25G uses a dedicated 4-inch Anti-Surge compressor cover.

The ported Anti-Surge inlet helps increase the compressor's usable operating range and is particularly relevant with a large high-flow compressor operating across varying engine speeds and boost conditions.

There is no current Non Anti-Surge housing option shown for this product.

Important 4-Inch Intake Requirement

The 4-inch compressor inlet is substantially larger than the factory turbocharger intake connection.

The compressor inlet / air-filter pipe must therefore be modified or replaced to suit the 4-inch turbo inlet.

A suitably sized intake is also important from a performance perspective. Restricting a 78mm compressor with an undersized intake system can compromise compressor efficiency and airflow.

CT26-Style Exhaust-Side Fitment

Despite the much larger compressor and TD06H turbine, Kinugawa retains the Toyota CT26-style turbine housing flange arrangement.

• Toyota CT26 4-bolt turbine inlet
• Toyota CT26 4-bolt turbine outlet
• Internal wastegate

This allows the turbocharger to connect to the compatible factory exhaust manifold and dump-pipe arrangement without requiring conversion to a completely different T3 or V-band turbine flange.

Oil & Water Cooling Option

The Oil & Water Cooled configuration uses engine oil for lubrication together with engine coolant through the centre housing for additional thermal management.

This configuration may be preferred where the vehicle already has suitable coolant plumbing or where additional centre-housing heat management is desirable.

Oil-Cooled Option

The TD06H-25G can alternatively be selected as an Oil-Cooled turbocharger.

This eliminates the need for water-cooling connections to the turbocharger centre housing and may simplify certain custom installations.

The oil supply and return must still be correctly sized, routed and unrestricted, and appropriate turbo warm-up and cool-down procedures remain important.

Journal Bearing with 360° Performance Thrust Bearing

The TD06H-25G uses a journal-bearing centre housing with a 360-degree performance thrust bearing.

The full-circumference thrust system is designed to support the increased axial loading created by a large performance compressor operating at elevated airflow and boost levels.

350–380HP Performance Capability

Kinugawa currently rates this exact TD06H-25G configuration for approximately 350–380HP crank / flywheel power for diesel applications.

This should be treated as the turbocharger's potential airflow capability rather than a guaranteed vehicle power figure.

Actual engine output depends on:

• Engine condition and compression
• Fuel delivery capability
• Injection pump or ECU calibration
• Injector specification
• Boost pressure
• Intercooler efficiency
• Intake-system flow
• Exhaust-system flow
• Exhaust gas temperature
• Engine cooling capacity
• Ambient temperature and altitude
• Supporting engine modifications
• Professional calibration

TD05H-18K vs TD06H-25G

Choose the TD05H-18K where a compact 7cm TD05H configuration and very high compressor capability are the priority.

Choose the TD06H-25G where you want the larger TD06H turbine, larger 8cm housing, 4-inch Anti-Surge compressor cover and increased turbine-side flow capacity.

TD06H-25G vs TD05H-20G

The difference between the TD05H-20G and TD06H-25G is substantial.

The TD05H-20G is intended for approximately 250–300HP builds and retains a smaller compressor, smaller TD05H turbine and response-focused 7cm housing.

The TD06H-25G moves to much larger compressor and turbine dimensions, making it more suitable for high-output engines where airflow at sustained high load is the priority.

Who Is the TD06H-25G For?

The TD06H-25G is primarily aimed at heavily modified Land Cruisers rather than mild performance upgrades.

Typical applications include:

• High-output 1HD-T engine builds
• High-output 1HD-FT engine builds
• Modified 1HD-FTE applications
• Competition Land Cruiser 80 builds
• Motorsport and extreme off-road vehicles
• High-load performance applications
• Vehicles with substantial fuel-system upgrades
• Vehicles with large high-efficiency intercoolers
• Vehicles with high-flow exhaust systems
• Custom engine builds requiring greater turbine-side flow capacity

Supporting Modifications

A TD06H-25G should be considered part of a complete high-performance engine package.

Depending on the engine specification and target output, supporting upgrades may include:

• High-capacity fuel system
• Injection-pump upgrades on mechanically injected engines
• Appropriate ECU calibration on electronically controlled engines
• Injector upgrades where required
• High-efficiency intercooler
• Large free-flowing air intake
• Free-flowing exhaust system
• Correct boost-control system
• Boost-pressure monitoring
• Exhaust-gas-temperature monitoring
• Engine cooling-system upgrades
• Engine internal upgrades depending on target power
• Drivetrain assessment for increased torque

Professional installation and dyno tuning are strongly recommended.

What’s Included

• 1 × Kinugawa TD06H-25G turbocharger
• 1 × Oil supply set
• 1 × Water coolant and return set
• 1 × Gasket set
• 1 × Kinugawa balance report with anti-counterfeit tag

Note: The manufacturer lists the water coolant and return set within the supplied kit even though an Oil-Cooled turbo configuration can be selected.

Manufacturing & Balancing

The TD06H-25G is supplied brand new.

Kinugawa states that the turbocharger receives full balancing using Schenck MBRS equipment in Germany and is supplied with an individual balance report and anti-counterfeit identification tag.

Installation Notes

• Toyota CT26-style 4-bolt turbine inlet
• Toyota CT26-style 4-bolt turbine outlet
• Internal wastegate
• Designed to bolt to the compatible factory exhaust manifold and dump pipe
• 4-inch compressor inlet requires intake / air-filter pipe modification
• 1HD-FTE installations should confirm the required compressor / intake arrangement
• Select Oil & Water Cooled or Oil-Cooled configuration according to the installation
• Oil supply and return must be correctly installed
• Water lines must be correctly installed when the Oil & Water Cooled version is selected
• Turbocharger must be primed with clean engine oil before first start-up
• Check the intake system for restrictions and leaks
• Check all exhaust connections for leaks
• Verify boost pressure before full-load operation
• Fuelling must be calibrated to the engine and turbo specification
• EGT monitoring is strongly recommended on high-output diesel builds

Professional installation and tuning are strongly recommended.

Frequently Asked Questions

Q1: Which engines does the Kinugawa TD06H-25G fit?
A: Kinugawa lists this turbo for Toyota Land Cruiser 1HD-series applications including the 1HD-T, 1HD-FT and compatible 1HD-FTE 4.2-litre turbo diesel engines.

Q2: How much power can the TD06H-25G support?
A: Kinugawa currently rates this exact 4-inch TD06H-25G configuration at approximately 350–380HP crank / flywheel power for diesel applications.

Q3: Does it fit the Toyota Land Cruiser 80?
A: Yes. Kinugawa specifically lists 1991–1997 HDJ80 / HDJ81 / HDJ82 vehicles fitted with the 1HD-T or 1HD-FT engine.

Q4: Does the TD06H-25G fit the 1HD-FTE?
A: Kinugawa also references compatible 1HD-FTE applications including HDJ78, HDJ79, HDJ100 and HDJ105. The intake and compressor housing configuration should be confirmed for the vehicle.

Q5: Is the compressor housing Anti-Surge?
A: Yes. This TD06H-25G uses a 4-inch Anti-Surge compressor housing as standard.

Q6: Can I select a Non Anti-Surge compressor housing?
A: The current Kinugawa product configuration does not show a Non Anti-Surge housing option for this TD06H-25G. The 4-inch Anti-Surge housing is the standard configuration.

Q7: What size compressor wheel does the TD06H-25G use?
A: The compressor wheel measures approximately 60.5 / 78.0mm.

Q8: What compressor wheel options are available?
A: The current product configurator offers Cast 6+6, Billet 6+6 and Billet 11+0 compressor wheel configurations.

Q9: Which compressor wheel is aimed at low-end torque?
A: Kinugawa identifies the Billet 6+6 configuration as the option focused towards stronger low-end torque.

Q10: Which compressor wheel is aimed at top-end performance?
A: Kinugawa identifies the Billet 11+0 configuration as the option focused towards stronger top-end speed and airflow.

Q11: What size turbine wheel does the TD06H-25G use?
A: The TD06H turbine wheel measures approximately 58.8 / 67.2mm.

Q12: What turbine wheel options can I select?
A: The current product configurator offers 12 Blades STD, 9 Blades STS and 10 Blades STS 55.

Q13: What turbine housing does it use?
A: The TD06H-25G uses an 8cm / A/R .57 internally gated turbine housing.

Q14: Is the 8cm turbine housing larger than the other Kinugawa LC80 turbos?
A: Yes. The smaller TD05H options in this range predominantly use 7cm / A/R .49 housings, while the TD06H-25G uses an 8cm / A/R .57 housing and a substantially larger turbine wheel.

Q15: What size is the compressor inlet?
A: The Anti-Surge compressor cover uses a 4-inch inlet.

Q16: Does the intake pipe require modification?
A: Yes. Kinugawa states that the compressor inlet / air-filter pipe must be modified to suit the 4-inch compressor inlet.

Q17: Does it bolt to the factory exhaust manifold?
A: On the stated compatible applications, yes. The turbine inlet uses the Toyota CT26-style 4-bolt mounting arrangement.

Q18: Does it connect to the factory-style dump pipe?
A: On compatible applications, yes. The turbine outlet retains the Toyota CT26-style 4-bolt arrangement.

Q19: What cooling options are available?
A: The TD06H-25G can be selected as Oil & Water Cooled or Oil Cooled.

Q20: What is the standard actuator pressure?
A: The standard actuator pressure is 1.0 bar / 14.7 PSI.

Q21: What alternative actuator pressures are available?
A: Kinugawa lists 0.3, 0.5, 0.8, 1.2, 1.5, 1.7 and 2.0 bar alternatives in addition to the standard 1.0 bar configuration.

Q22: What bearing system does the TD06H-25G use?
A: It uses a journal-bearing system with a 360-degree performance thrust bearing.

Q23: What is included with the turbo?
A: The set includes the TD06H-25G turbocharger, oil supply set, water coolant and return set, gasket set and Kinugawa balance report with anti-counterfeit tag.

Q24: What is the difference between the TD05H-18K and TD06H-25G?
A: The TD05H-18K uses a smaller TD05H turbine, 7cm housing and 55.1 / 75mm compressor. The TD06H-25G uses a significantly larger 58.8 / 67.2mm TD06H turbine, 8cm housing and 60.5 / 78mm compressor. The TD06H therefore places greater emphasis on turbine-side flow capacity.

Q25: Why does the TD05H-18K have a similar or even higher published horsepower rating?
A: Turbocharger capability cannot be judged solely by the published horsepower figure. The TD05H-18K and TD06H-25G use very different compressor, turbine and housing combinations. The TD06H-25G provides substantially greater turbine-side flow capacity and may be better suited to engines operating at sustained high exhaust flow.

Q26: Does the TD06H-25G require professional tuning?
A: Yes. Correct fuelling, boost control, intercooling and calibration are essential with a turbocharger of this capacity. Professional installation and dyno tuning are strongly recommended.

Why Buy from OFM4x4.CO.UK

• Specialists in Toyota Land Cruiser performance upgrades
• Complete six-model Kinugawa 1HD turbo range
• Turbo options for 1HD-T, 1HD-FT and 1HD-FTE engines
• Responsive TD05H and high-flow TD06H turbo options
• Compressor wheel configuration choices
• Turbine wheel configuration choices
• Oil or Oil & Water cooling options on the TD06H-25G
• Multiple actuator pressures available
• Technical assistance when selecting the correct turbo configuration
• Supporting Land Cruiser performance upgrades available
• UK-based customer service