M178 ECU Tune

The M178 is AMG's first clean-sheet V8 built specifically for a single car, the AMG GT, continuing a V8 lineage Mercedes proudly traces all the way back to the legendary 300 SEL 6.8 AMG racer. Like the M156 and M159 before it, every M178 is hand-built in Affalterbach under AMG's "one man, one engine" principle, the builder's own signature stamped onto the engine plate. What truly sets it apart technically is its "hot inside V" layout, which tucks both turbochargers inside the cylinder banks rather than outside them for a more compact, better-breathing package, combined with dry-sump lubrication that lets the 4.0-liter twin-turbo V8 mount low in the GT's chassis for a lower center of gravity and razor-sharp handling balance.

Weistec's ECU tune for the M178 is a software recalibration of the factory engine management, built around the hot-vee turbo layout and dry-sump architecture AMG already engineered. The gain is substantial, 456 to 605 horsepower and 443 to 624 lb-ft of torque from the factory hardware, delivered through an OEM-level calibration process, with knock protection, thermal management, and the GT's factory diagnostics fully preserved. A hand-built masterpiece of an engine, taken to a level even Affalterbach didn't send it out the door with.