JDM Honda Legend C20A Turbo 2.0L V6 Engine & 4-Speed Automatic Transmission

Own a rare piece of Honda’s Japanese performance history with this JDM Honda Legend C20A 2.0L turbocharged V6 engine and 4-speed automatic transmission package from J-Spec Auto Sports.

Honda offered the turbocharged C20A in select Japanese-market first-generation Legend models. Often referred to as the C20A Wing Turbo, this unusual 2.0L V6 used a variable-geometry turbocharging system and represented one of Honda’s more technically interesting performance engines from the late 1980s.

This specific drivetrain includes the C20A turbo engine together with a 4-speed automatic transmission.

Before offering the package for sale, J-Spec Auto Sports inspected and compression-tested the engine. In addition, actual product photos and an engine video allow buyers to review the specific unit rather than relying on stock images.

Because this is a rare Japanese-market drivetrain, buyers must verify compatibility before purchase.

Drivetrain at a Glance

• Manufacturer: Honda
• Vehicle Family: Honda Legend
• Engine Code: C20A
• Engine Serial Number: C20A 5006493
• Engine Type: Turbocharged V6
• Displacement: 2.0L / 1,996cc
• Valvetrain: SOHC 24-Valve
• Fuel System: PGM-FI
• Aspiration: Turbocharged
• Turbo System: Honda Wing Turbo / Variable-Geometry Turbo
• Transmission: 4-Speed Automatic
• Drivetrain Layout: Front-Wheel Drive
• Mileage: Approximately 60,000 Miles
• Condition: Used JDM Engine and Transmission
• Testing: Compression Tested
• Evidence: Actual Product Photos and Video
• Warranty: 30 Days
• SKU: A637
• Nationwide Freight Shipping Available
• Buyer Must Verify Fitment

Rare Honda Legend Wing Turbo Engine

The turbocharged C20A is one of the more unusual engines Honda produced during the 1980s.

Unlike the naturally aspirated C20A, Honda equipped the turbo version with its Wing Turbo system.

The system used variable turbine control to improve turbocharger response across different operating conditions.

As a result, the C20A Turbo combined compact 2.0-liter displacement with the smoothness of a V6 and the added torque of forced induction.

Honda rated the turbo C20A at approximately 190 PS, with significantly more torque than the naturally aspirated C20A.

For Honda collectors and JDM enthusiasts, this makes the C20A Turbo significantly more interesting than the standard non-turbo Legend engine.

Honda C20A Turbo Specifications

• Engine Family: Honda C-Series
• Engine Code: C20A Turbo
• Displacement: 1,996cc
• Configuration: V6
• Valvetrain: SOHC
• Valves: 24
• Fuel Delivery: Honda PGM-FI
• Aspiration: Turbocharged
• Turbo System: Variable-Geometry Wing Turbo
• Factory Output: Approximately 190 PS
• Factory Torque: Approximately 241 Nm / 178 lb-ft
• Cooling: Liquid Cooled
• Fuel Type: Gasoline

The turbocharged C20A was substantially different from the naturally aspirated C20A despite sharing the same basic engine family.

Therefore, buyers should not assume that naturally aspirated C20A components automatically interchange with this turbo drivetrain.

4-Speed Automatic Transmission Included

This listing includes the 4-speed automatic transmission paired with the C20A turbo engine.

That makes this package especially useful for restoration projects because sourcing a rare engine and its correct transmission separately can be difficult.

The transmission remains part of the complete drivetrain package shown in the listing.

However, buyers should still inspect the actual photographs and contact J-Spec Auto Sports to confirm exactly which accessories, brackets, electronics, and drivetrain components come with the unit.

1988–1989 Honda Legend Application

This drivetrain is associated with the late first-generation Japanese-market Honda Legend turbo application.

Therefore, I recommend targeting this product primarily toward:

• Late-1988 Honda Legend C20A Turbo applications
• 1989 Honda Legend C20A Turbo applications
• Japanese-market Honda Legend Wing Turbo restoration projects
• Specialty Honda C-Series turbo projects

Do not advertise this package as a direct replacement for every 1985–1990 Honda Legend.

Different first-generation Legend models used several engines, including naturally aspirated C20A, C25A, and C27A variants.

Therefore, the buyer must verify the original drivetrain before ordering.

Important Fitment Warning

This is a Japanese-market drivetrain.

Consequently, J-Spec Auto Sports does not recommend assuming direct plug-and-play compatibility with a U.S.-market Acura Legend.

Differences may include:

• Engine configuration
• Wiring harness
• ECU
• Turbocharger controls
• Intake system
• Exhaust system
• Fuel-system components
• Cooling system
• Sensors
• Transmission controls
• Engine mounts
• Axles
• Accessory brackets
• Emissions equipment
• Electrical connectors

Therefore, customers purchasing this drivetrain for a custom installation or conversion should expect fabrication, wiring, tuning, or component transfer.

Most importantly, verify the intended application before purchase.

Honda Legend vs. Acura Legend Fitment

Although the Japanese Honda Legend and North American Acura Legend belong to the same basic vehicle family, their engines and specifications varied considerably.

For example, many North American first-generation Acura Legends used larger naturally aspirated C-Series engines rather than the Japanese 2.0L turbo C20A.

Therefore, do not assume this engine is a direct replacement for a U.S.-market Acura Legend simply because the chassis family is related.

A custom swap may require significant mechanical and electrical work.

What Is Included?

The primary package includes:

• Honda C20A 2.0L Turbo V6 Engine
• 4-Speed Automatic Transmission

Additional components shown in the actual product photographs may remain attached.

However, unless J-Spec Auto Sports specifically identifies those accessories as included and warrantied, consider them convenience items.

Possible attached items may include:

• Turbocharger
• Intake components
• Exhaust components
• Wiring
• Sensors
• Brackets
• Accessories
• Hoses
• Transmission components

Therefore, review every actual product photograph before ordering.

Compression Tested Before Sale

J-Spec Auto Sports compression tested this engine before offering it for sale.

The engine produced excellent compression-test results according to the current listing.

Compression testing provides useful information about cylinder sealing and basic internal engine condition.

However, compression testing represents only one part of evaluating a nearly four-decade-old turbocharged drivetrain.

Therefore, buyers should also inspect:

• Oil condition
• Turbocharger condition
• Cooling system
• External seals
• Wiring
• Vacuum lines
• Transmission fluid
• Engine mounts
• Intake hoses
• Electrical connectors

Actual Engine Video

An actual video is available for this specific engine.

Engine Serial Number: C20A 5006493

Because this is a rare drivetrain, the video provides especially valuable first-party evidence.

Whenever possible, review the video together with the actual engine photos before purchasing.

Recommended Inspection Before Installation

Because of the age and rarity of this drivetrain, we recommend a thorough inspection before installation.

Inspect or service the following as appropriate:

• Engine oil
• Oil filter
• Spark plugs
• Timing components
• Water pump
• Thermostat
• Coolant hoses
• Vacuum hoses
• Turbocharger
• Turbo oil lines
• Turbo coolant lines
• Accessory belts
• Fuel hoses
• Valve cover seals
• Crankshaft seals
• Transmission fluid
• Transmission seals
• Axle seals
• Electrical connectors

In addition, replace any hose or seal that shows cracking, brittleness, leakage, or deterioration.

Older rubber components can fail even when the engine itself remains mechanically sound.

Inspect the Turbocharger

The turbocharger deserves special attention because of the age of this drivetrain.

Before installation, inspect:

• Compressor wheel
• Turbine wheel
• Shaft play
• Turbo housing
• Oil leakage
• Oil feed
• Oil return
• Coolant connections
• Variable turbo mechanism
• Vacuum or control components

Do not assume that an attached turbocharger remains serviceable simply because the engine has good compression.

Instead, evaluate the turbocharger independently before running the engine under boost.

Inspect Turbo Oil and Coolant Lines

Turbochargers depend on proper lubrication and cooling.

Therefore, inspect all turbocharger oil and coolant lines before startup.

Look for:

• Internal restrictions
• Sludge
• Cracked hoses
• Hardened hoses
• Damaged fittings
• Corrosion
• Leakage

Replace questionable components before operating the engine.

Inspect Vacuum Lines and Turbo Controls

The Wing Turbo system relies on proper control of the turbocharger.

Because vacuum hoses and related components age over time, inspect every line carefully.

Replace any hose that shows:

• Cracking
• Hardening
• Swelling
• Oil saturation
• Loose connections

A small vacuum leak can affect drivability and turbocharger control.

Cooling-System Inspection

Before operating the engine, inspect the entire cooling system.

Check:

• Radiator
• Water pump
• Thermostat
• Coolant hoses
• Heater hoses
• Turbo coolant lines
• Cooling fans
• Reservoir
• Radiator cap
• Coolant fittings

Because this drivetrain dates from the late 1980s, age-related cooling-system deterioration deserves particular attention.

Fuel-System Inspection

Older fuel hoses can become brittle.

Therefore, inspect all fuel-related components before startup.

Check:

• Fuel hoses
• Injector seals
• Fuel rail
• Fuel-pressure regulator
• Electrical connectors
• Fuel lines

Replace any questionable hose before introducing fuel pressure.

This is especially important on an older turbocharged engine.

Transmission Inspection Before Installation

The included 4-speed automatic transmission should also receive preventive service.

Before installation, inspect:

• Transmission fluid
• Fluid pan
• External seals
• Axle seals
• Electrical connectors
• Shift linkage
• Transmission mounts
• Torque converter area
• Cooler connections

Use the correct Honda-compatible transmission fluid for the specific transmission.

Additionally, inspect the transmission cooler and cooler lines before operating the drivetrain.

Prime the Engine Before Startup

Do not install this engine and immediately start it after long-term storage or transportation.

Instead, establish engine lubrication first.

Add the correct engine oil and install a quality oil filter.

Then prime the lubrication system according to appropriate service procedures before normal combustion.

As a result, engine bearings and turbocharger components can receive lubrication before operating under normal load.

Prime the Turbocharger

Turbocharger lubrication is especially important.

Therefore, establish oil flow to the turbocharger before allowing the engine to operate under boost.

Avoid immediately revving a freshly installed or long-stored turbo engine.

Instead, allow oil pressure and coolant circulation to stabilize first.

Initial Startup Checklist

Before starting the C20A Turbo:

1. Fill the engine with fresh oil.
2. Install a new oil filter.
3. Inspect all fuel hoses.
4. Inspect turbo oil lines.
5. Inspect turbo coolant lines.
6. Inspect all vacuum hoses.
7. Verify electrical connections.
8. Verify engine grounds.
9. Fill the cooling system.
10. Check transmission fluid.
11. Verify intake connections.
12. Check exhaust connections.
13. Prime the engine lubrication system.
14. Prime the turbocharger.
15. Verify there are no loose tools or hardware.
16. Start the engine and immediately inspect for leaks.

Most importantly, stop the engine if you detect abnormal oil pressure, severe mechanical noise, major fuel leakage, overheating, or turbocharger problems.

Initial Running Inspection

Once the engine starts, monitor:

• Oil pressure
• Oil leaks
• Fuel leaks
• Coolant leaks
• Turbo oil leaks
• Turbo coolant leaks
• Engine temperature
• Charging voltage
• Idle quality
• Abnormal mechanical noise
• Turbocharger noise
• Exhaust smoke
• Transmission engagement

Allow the engine to reach operating temperature gradually.

Afterward, shut it down and inspect all fluid levels again.

Do Not Immediately Run Full Boost

After installation, avoid immediately operating the engine at maximum boost or high RPM.

First, verify:

• Stable oil pressure
• Correct coolant temperature
• No leaks
• Proper turbocharger operation
• Correct transmission operation
• Proper fueling
• Correct engine-management operation

Only after confirming basic operation should the drivetrain receive heavier load.

Rare JDM Restoration and Collector Application

This drivetrain is especially suitable for someone restoring a rare Japanese-market Honda Legend Turbo.

Unlike common Honda engine families, C20A Turbo replacement parts and complete drivetrains are difficult to find.

Therefore, the value of this package comes not only from the engine itself but also from the fact that the matching-style automatic transmission accompanies it.

For a period-correct Honda Legend restoration, keeping the engine and transmission together may be particularly valuable.

Why Buy This C20A Turbo From J-Spec Auto Sports?

J-Spec Auto Sports offers:

• Rare JDM Honda drivetrain inventory
• Actual engine photos
• Engine serial identification
• Compression-tested engine
• Actual product video
• Matching 4-speed automatic transmission
• Nationwide freight shipping
• Local pickup
• Fitment assistance
• 30-day warranty

In addition, this is an actual inventory item rather than a generic catalog listing.

Nationwide Freight Shipping

J-Spec Auto Sports ships engines and transmissions throughout the continental United States.

Because this package includes both an engine and transmission, freight shipping will normally apply.

Delivery options may include:

• Automotive repair shops
• Commercial addresses
• Freight terminals
• Residential locations where freight service is available
• Local pickup from J-Spec Auto Sports

Contact our team for current freight information before ordering.

Inspect the Shipment at Delivery

Always inspect the complete drivetrain package before signing for delivery.

Check for:

• Broken pallet
• Damaged packaging
• Cracked engine components
• Broken sensors
• Turbo damage
• Oil-pan damage
• Transmission-case damage
• Broken mounting points
• Damaged connectors
• Visible fluid leakage

If visible freight damage exists, photograph it immediately and document the damage with the carrier.

Then contact J-Spec Auto Sports.

30-Day Warranty

This drivetrain currently includes a 30-day J-Spec Auto Sports warranty.

Customers should review the complete warranty terms before installation.

Because this is a rare vintage JDM drivetrain, customers should pay particular attention to what the warranty covers for the engine, transmission, turbocharger, and attached accessories.

Frequently Asked Questions

What is a Honda C20A Turbo?

The C20A Turbo is a Japanese-market 2.0L turbocharged Honda V6 used in select first-generation Honda Legend models.

Honda marketed the turbocharging system as Wing Turbo.

Is this the naturally aspirated C20A?

No.

This listing is for the turbocharged C20A drivetrain.

Therefore, it differs significantly from naturally aspirated C20A applications.

Is this engine sometimes called C20AT?

Yes.

Enthusiasts and parts references often use C20AT to distinguish the turbocharged C20A from the naturally aspirated version.

However, the engine stamping itself may still show C20A.

How much power did the C20A Turbo produce?

Published specifications generally list the turbocharged C20A at approximately 190 PS.

What makes the Wing Turbo special?

Honda used a variable-geometry-style turbocharger control system designed to improve turbo response across different engine speeds and loads.

That makes the C20A Turbo historically interesting because variable turbo technology was uncommon on gasoline production cars of this era.

Is the automatic transmission included?

Yes.

This listing includes a 4-speed automatic transmission with the C20A turbo engine.

Is this engine compression tested?

Yes.

J-Spec Auto Sports states that this engine produced excellent results during compression testing.

What is the engine serial number?

The engine serial number is:

C20A 5006493

How many miles are on the drivetrain?

The current listing states approximately 60,000 miles.

Will this fit my Acura Legend?

Do not assume direct fitment.

North American Acura Legend models commonly used different C-Series engine configurations.

Therefore, verify mechanical, wiring, electronics, mounting, and transmission compatibility before purchase.

Will this fit any 1985–1990 Honda Legend?

No.

The first-generation Legend used several different engine configurations.

Therefore, verify that your vehicle originally used the compatible turbo C20A drivetrain.

Is this plug-and-play?

Only for the correct original application should direct compatibility even be considered.

For custom conversions, expect additional wiring, fabrication, plumbing, ECU, exhaust, cooling, and drivetrain work.

Is the turbocharger included?

The actual product photographs should show whether the turbocharger remains attached.

However, attached accessories should not automatically be considered warrantied unless the invoice or warranty terms specifically state coverage.

Should I service the turbo before installation?

Yes.

Given the age of the drivetrain, inspect the turbocharger, oil lines, coolant lines, shaft play, and variable turbo controls before use.

Should I replace old hoses?

Yes.

Inspect and replace brittle, hardened, cracked, swollen, or leaking fuel, coolant, vacuum, and turbo hoses.

Should I prime the engine before startup?

Yes.

Establish engine lubrication before normal startup after installation or extended storage.

Should I prime the turbocharger?

Yes.

Verify oil reaches the turbocharger before placing it under load.

Should I service the automatic transmission?

Yes.

Inspect the fluid, seals, cooler lines, connectors, mounts, and torque-converter area before installation.

Does this drivetrain come with a warranty?

The current listing includes a 30-day warranty.

Review the complete warranty terms before purchase.

Can J-Spec Auto Sports ship the engine and transmission?

Yes.

Nationwide freight shipping is available for large drivetrain components.

Buy This Rare JDM Honda Legend C20A Turbo Drivetrain

If you are restoring a rare Japanese Honda Legend Turbo or searching for a hard-to-find C20A drivetrain, this package offers an unusual opportunity.

This specific unit includes:

• Honda C20A 2.0L Turbo V6
• Honda Wing Turbo System
• 4-Speed Automatic Transmission
• Approximately 60,000 Miles
• Compression-Tested Engine
• Engine Serial C20A 5006493
• Actual Product Photos
• Actual Engine Video
• 30-Day Warranty
• Nationwide Freight Shipping

Because complete C20A turbo engine and transmission packages are uncommon, this drivetrain is especially attractive for Honda Legend restoration, preservation, and specialty JDM projects.

Contact J-Spec Auto Sports before ordering if you need additional photos, measurements, component confirmation, or fitment information.