Weistec Engineering – Mercedes-Benz M256 ECU Tune

Description

Weistec Engineering ECU tune for the M256-powered Mercedes-Benz models (2017-2026) with the Turbocharged 3L I6 (M256). Weistec’s crank figures put the tuned engine at 540 hp and 566 lb-ft, up from 497 hp and 476 lb-ft stock, from a recalibration of the factory ECU software.

Key Features:

• Up to +43 hp / +90 lb-ft: Weistec’s crank estimate of 540 hp and 566 lb-ft, from Dynojet testing; real gains depend on fuel, conditions and supporting modifications.
• Stage calibrations: W.1 (Stock Vehicle) and W.2 (Race Exhaust fitted), so the calibration matches the hardware on your car.
• Optional add-ons: CPC Module (2019+) and 9 Speed TCU Tune (2019+), each selectable when you order.
• Reflash of the factory ECU: the original module is recalibrated rather than replaced with a stand-alone or piggyback unit.
• What changes: improved throttle response, optimized fuel and spark, increased boost and top speed limiter removed.
• Tuning method: Cypher Pro Dealer: installed through a certified Weistec Cypher Pro dealer.

Fitment:

• Mercedes-Benz AMG GT43 4 Door Coupe 2018-2024 (X290) – Turbocharged 3L I6 (M256)
• Mercedes-Benz AMG GT53 4 Door Coupe 2018-2024 (X290) – Turbocharged 3L I6 (M256)
• Mercedes-Benz CLE53 AMG 2024-2026 (C236 / A236) – Turbocharged 3L I6 (M256)
• Mercedes-Benz CLS450 2018-2021 (C257) – Turbocharged 3L I6 (M256)
• Mercedes-Benz CLS53 AMG 2018-2021 (C257) – Turbocharged 3L I6 (M256)
• Mercedes-Benz E450 2021-2023 (W213 / S213 / C238 / A238) – Turbocharged 3L I6 (M256)
• Mercedes-Benz E53 AMG 2018-2024 (W213) – Turbocharged 3L I6 (M256)
• Mercedes-Benz GLE450 2019-2021 (V167) – Turbocharged 3L I6 (M256)
• Mercedes-Benz GLE53 AMG 2019-2026 (V167 / C167) – Turbocharged 3L I6 (M256)
• Mercedes-Benz GLS450 2020-2023 (X167) – Turbocharged 3L I6 (M256)
• Mercedes-Benz S450 (EU) 2017-2020 (W222) – Turbocharged 3L I6 (M256)
• Mercedes-Benz S500 2017-2021 (W222 / W223) – Turbocharged 3L I6 (M256)

Not legal for sale or use on pollution-controlled motor vehicles; intended for competition use. Talk to us before ordering to confirm the right stage and tuning method for your car.