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.
The 4G32 T's primary reliability risk is turbocharger bearing failure due to inadequate oil drainage in early builds, with elevated incidence in high-boost or track-use applications. Mitsubishi internal service data from 1985 indicated turbo failures in ~15% of pre-1984 engines before 80,000 km, while period MOT-equivalent records show high exhaust hydrocarbon levels due to basic catalyst design. Thermal stress and oil coking make post-drive cooldown and oil quality critical.
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.
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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.
Yes. The 4G32 T responds well to period-appropriate tuning. Boost increases (to ~0.8 bar), cam upgrades, and carburettor or MPFI recalibration can yield 130–140 PS reliably. The low 8.0:1 compression allows safe boost increases without detonation. Many owners retrofit modern TD04 or TD05 turbos with supporting fuel upgrades.
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.
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