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The Mercedes-AMG GT family runs the M178 — the dry-sump variant of AMG's 4.0L twin-turbo V8. Like its wet-sump sibling (the M177), the M178's stock high-pressure fuel pump is the first bottleneck when pushing beyond factory output. This guide covers HPFP upgrade options specifically for the AMG GT, GTS, GTC, GTR, and Black Series. M178 vs M177 — What's Different? The M178 shares the same 4.0L twin-turbo V8 block architecture as the M177 but uses a dry-sump lubrication system instead of wet sump. This allows the engine to sit lower in the chassis for a lower center of gravity —...

Why the M177 Oil System Is Over-Engineered — and Why That Matters for Tuning AMG did not build the M177 with a simple oil pump and a filter. The 4.0-litre twin-turbo V8 uses a two-stage oil pressure regulation system, a dedicated wheel-arch-mounted oil cooler, and an oil circuit designed to survive sustained lateral G-forces on track. If you are building an M177 to 700, 800, or 900+ HP, understanding how this system works — and where it reaches its limits — is the difference between a reliable build and a spun bearing. Two-Stage Oil Pressure Regulation: How It Works The...

Mercedes-AMG M178 turbo upgrade guide for AMG GT, GTS, GTC, and GTR. Stage 3 and Stage 4 turbo options, power targets from 700 to 1,000+ WHP, supporting mods, and costs from YPG Motorsport.

The Mercedes-AMG GT is a front-mid-engine grand tourer built around the M178 4.0-litre twin-turbo V8 — a hand-assembled unit that shares its displacement and hot-vee architecture with the C63’s M177 but differs significantly in its dry-sump lubrication, engine mounts, exhaust routing, and ECU calibration. The AMG GT’s factory exhaust system is designed with emissions compliance and NVH refinement as priorities, and the catalytic converters sitting directly downstream of each turbocharger are the primary flow restriction in the system. The Factory Exhaust Restriction In the AMG GT, both turbochargers sit inside the cylinder bank vee, feeding exhaust through tightly packaged catalytic...

Mercedes-AMG uses two versions of its hand-built 4.0-litre twin-turbo V8: the M177 and the M178. They share the same bore, stroke, and hot-inside-V turbo layout — but they are not the same engine and they are not interchangeable. If you are ordering an engine build, turbo kit, or any internal component, you need to know which one you have. This guide explains the differences. Quick Comparison M177 M178 Displacement 3,982 cc (4.0L) 3,982 cc (4.0L) Configuration 90° V8, DOHC, 32-valve 90° V8, DOHC, 32-valve Turbo layout Hot-inside-V Hot-inside-V Oil system Wet sump Dry sump Block casting M177-specific M178-specific Oil pan...