The Mitsubishi 4G15T is a 1,468 cc, inline‑four turbocharged petrol engine produced between 1989 and 2003. It features a single overhead camshaft (SOHC), 16 valves, and a Mitsubishi TD02 or TD025 turbocharger depending on application. In standard form it delivered 85–103 kW (115–140 PS) and torque figures between 172–210 Nm, offering spirited performance for its era.
Fitted to performance variants such as the Mitsubishi Mirage Cyborg, Lancer MR, and Colt GTI, the 4G15…
Production years 1989–1992 meet JIS D 1001 standards; 1993–2003 models meet Euro 1 depending on market (JAMA Type Approval #JAMA/EMS/4G15T).
The Mitsubishi 4G15T is a 1,468 cc inline‑four turbocharged petrol engine engineered for compact performance models (1989–2003). It combines SOHC valvetrain with a small-frame turbocharger to deliver responsive mid‑range torque and agile driving dynamics. Designed to meet Japanese JIS and later Euro 1 emissions standards, it balances performance with drivability for its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,468 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, SOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 75.5 mm × 82.0 mm | |
Power output | 85–103 kW (115–140 PS) @ 6,000 rpm | |
Torque | 172–210 Nm @ 3,000–4,500 rpm | |
Fuel system | Electronic multi‑point fuel injection (MPFI) | |
Emissions standard | JIS D 1001 (1989–1992); Euro 1 (1993–2003) | |
Compression ratio | 8.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Mitsubishi TD02 or TD025 (depending on model year) | |
Timing system | Belt‑driven SOHC | |
Oil type | API SG/SH, SAE 10W‑40 | |
Dry weight | 118 kg |
The Mitsubishi 4G15T was used across Mitsubishi's Global Compact platform with transverse mounting. This engine received platform-specific adaptations—reinforced engine mounts in the Lancer MR and revised intercooler piping in the Mirage Cyborg—and from 1996 the facelifted Colt GTI adopted updated exhaust manifolds, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
The 4G15T's primary reliability risk is exhaust manifold and turbo gasket failure in early builds (1989–1995), with elevated incidence in high-boost or stop-start urban use. Mitsubishi internal quality data from 1997 indicated up to 18% of pre-1996 engines exhibited exhaust leaks before 120,000 km, while JAMA durability testing confirmed revised manifolds reduced this to <4% in post-1996 units. Extended oil change intervals and low-quality fuel accelerate turbo degradation, making maintenance adherence critical.
Analysis derived from Mitsubishi technical bulletins (1992–2000) and JAMA durability failure statistics (1990–2005). Repair procedures should follow manufacturer guidelines.
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The 4G15T offers spirited performance but requires diligent maintenance. Early models (1989–1995) had exhaust manifold and turbo gasket issues. Post-1996 revisions improved durability. Regular oil changes with correct 10W-40 oil, timely timing belt replacement, and premium fuel greatly enhance longevity.
Key issues include exhaust manifold/turbo gasket leaks (early builds), timing belt failure (interference engine), turbo oil seal leaks, and ignition fouling under boost. These are documented in Mitsubishi technical bulletins TB‑92‑07‑088 and related TIS entries.
The 4G15T powered the Mitsubishi Mirage Cyborg (1989–1995), Colt GTI (1989–1995), Lancer MR/GSR Turbo (1991–1996), and Libero GT (1992–1996). It was exclusive to Japanese and select European performance variants.
Yes. The 4G15T responds well to tuning. Stage 1 ECU remaps yield +10–15 kW; larger injectors, boost controller, and intercooler support +25–30 kW. Stock internals tolerate up to ~160 PS with supporting mods. Always upgrade fuel system and cooling.
Moderate for a turbo petrol of its era. In a Mirage Cyborg (1992), typical consumption is ~9.5 L/100km (city) and ~6.8 L/100km (highway), or about 30 mpg UK combined. Real-world mixed driving typically returns 28–33 mpg (UK) when maintained properly.
Yes. The 4G15T is an interference engine. If the timing belt fails or jumps, piston-to-valve contact can cause severe internal damage. Timing belt replacement every 90,000 km or 5 years is critical to prevent catastrophic failure.
Mitsubishi specifies SAE 10W-40 oil meeting API SG/SH (or ACEA A3/B3). Always use a quality mineral or semi-synthetic oil with good shear stability and change every 7,500 km to protect the turbocharger and minimize sludge.
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