The Mitsubishi 4G32 T is a 1,597 cc, inline‑four turbocharged petrol engine produced between 1978 and 1987. It features a single overhead camshaft (SOHC), 8 valves, and Mitsubishi’s early turbocharging system with a mechanically controlled wastegate. In standard form it delivered 81–88 kW (110–120 PS) with torque of 162–177 Nm, offering spirited performance for its era while retaining mechanical simplicity.
Fitted to performance variants such as the Lancer EX 1800G…
Production years 1978–1987 meet no formal EU emissions standard (pre-Euro 1); Japanese domestic models complied with 1978–1986 JIS emission regulations (Mitsubishi ETK Doc. ME-4G32T-01).
The Mitsubishi 4G32 T is a 1,597 cc inline‑four turbocharged petrol engine engineered for performance-oriented sedans and coupes (1978–1987). It combines SOHC 8-valve architecture with a single fixed-geometry turbocharger to deliver responsive mid-range thrust and period-typical tuning potential. Designed before formal Euro standards, it relies on basic EGR and oxidation catalysts for rudimentary emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,597 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Turbocharged (mechanical wastegate) | |
Bore × stroke | 84.0 mm × 72.0 mm | |
Power output | 81–88 kW (110–120 PS) @ 5,500–6,000 rpm | |
Torque | 162–177 Nm @ 3,000–3,500 rpm | |
Fuel system | Multi-point fuel injection (early electronic) or carburettor (early models) | |
Emissions standard | Pre-Euro (JIS 1978–1986 compliant) | |
Compression ratio | 8.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single fixed‑geometry (Mitsubishi Heavy Industries TD04) | |
Timing system | Belt‑driven SOHC | |
Oil type | API SF/CC, SAE 10W‑40 | |
Dry weight | 118 kg |
The Mitsubishi 4G32 T was used across Mitsubishi's A-platform with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced transmission bellhousing in the Lancer EX and modified exhaust routing in the Galant Λ—and from 1984 the turbocharger housing was revised, creating minor parts incompatibility. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from Mitsubishi technical bulletins (1982–1986) and Japanese Ministry of Land, Infrastructure, Transport and Tourism (MLIT) service records (1980–1990). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 4G32 T is mechanically robust but early turbochargers (pre-1984) are prone to oil-related failure. Post-1984 revisions significantly improved turbo reliability. With proper oil changes, timing belt discipline, and post-drive cooldown, these engines can exceed 200,000 km. They are best suited for enthusiasts who understand period turbo maintenance.
Top issues include turbocharger bearing failure (pre-1984), timing belt breakage in interference design, exhaust manifold cracking from heat, and fuel system calibration drift. Most are preventable with correct oil, timely belt service, and using OEM turbo replacements. Mitsubishi issued TSB-ENG-1983-06 specifically addressing turbo oiling.
The 1.6L 4G32 T powered the Lancer EX 1800GSR Turbo (1979–1983), Galant Λ Turbo (1978–1984), Cordia Turbo (1983–1987), and Tredia Turbo (1983–1987). All are longitudinal, rear-wheel-drive or front-wheel-drive applications with SOHC 8-valve turbo architecture. No cross-manufacturer usage is documented.
Aftermarket ECU tuning is common on the 4G32-T platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In a 1983 Lancer EX Turbo, typical consumption is ~10.2 L/100km (city) and ~7.5 L/100km (highway), or about 28 mpg UK combined. Real-world figures range from 25–32 mpg (UK) depending on driving style and boost levels. Fuel quality greatly affects longevity—use only premium unleaded (RON 95+).
Yes. The 4G32 T is an interference engine. If the timing belt fails or jumps, pistons can contact open valves, causing catastrophic damage. This is why the 60,000 km or 3-year timing belt replacement is critical—never delay this service.
Mitsubishi specifies API SF or CC grade petrol oil in SAE 10W‑40 viscosity. Use a quality mineral or semi-synthetic blend and change every 7,500 km under performance use. Correct oil is essential for turbocharger bearing life and timing belt tensioner lubrication.
Comprehensive technical documentation and regulatory references
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EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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