GLC63 AMG Stage 1 vs Stage 2 ECU Tune — M177 4.0T V8 Power Comparison
GLC63 AMG — Stage 1 vs Stage 2 ECU Tune
The Mercedes-AMG GLC63 S pairs the hand-built M177 4.0-litre twin-turbo V8 with a practical SUV body — 510 HP stock, but with significantly more left on the table. Here's how Stage 1 and Stage 2 ECU tunes transform the GLC63 into one of the fastest SUVs on the road.
Power Comparison
| Specification | Stock | Stage 1 | Stage 2 |
|---|---|---|---|
| Engine | M177 4.0T V8 — Twin-Turbo, Handbuilt | ||
| Peak Horsepower | 510 HP | ~620 HP | ~680 HP |
| Peak Torque | 700 Nm | ~820 Nm | ~900 Nm |
| Hardware Required | — | None — ECU only | Downpipes + intake |
| 0-100 km/h (est.) | 3.8s | ~3.3s | ~3.0s |
Stage 1 — ECU Calibration Only
Stage 1 is a software-only modification — no parts to install. The ECU calibration is rewritten to optimize boost pressure, ignition timing, and fuel delivery within the M177's factory hardware limits. The result is approximately 110 HP and 120 Nm over stock, with improved throttle response and a more aggressive power delivery across the entire RPM range. The GLC63 shares the same M177 platform as the C63 AMG and GT63, so tuning potential is identical.
Stage 2 — ECU + Hardware
Stage 2 adds catless or high-flow downpipes and typically an upgraded intake. The reduced exhaust backpressure allows the turbos to spool faster, sustain higher boost, and breathe more efficiently at the top of the RPM range. Combined with a Stage 2 ECU calibration, the GLC63 reaches approximately 680 HP — a 170 HP gain over stock that completely transforms the SUV's character.
Beyond Stage 2
For owners chasing 800+ HP, a full Stage 3 package with upgraded turbos, fueling, and forged internals is the path — proven on YPG's world-record 9.97s C63 W205 platform.