RENNtech ECU+ Upgrade | 167 | GLS / GLE 580 EQ Boost | 592 HP / 704 LB-FT | 4.0L V8 BiTurbo EQ Boost | M176 | MY2020+

ECU+ Upgrade | Up to 592 HP / 704 LB-FT | Gains: +68 HP & +120 LB-FT

RENNtech HHT (Hand Held Tuner) is the number one ECU programmer for Mercedes-Benz and AMG. Do it yourself tuning, no ECU removal or mechanical modifications necessary!

RENNtech’s proprietary tuning module contains both the Tuned file as well as your vehicles Stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU. Programming takes only a few minutes and the vehicle can be re-flashed at any time as many times as you wish.

With the proprietary RENNtech ECU Tuning gains up to +68 HP and +120 LB-FT (13% increase), based on power numbers measured by RENNtech. Please note that the Mercedes M176 engine performance when measured, obtains higher numbers than rated from factory. The maximum power number reached with the RENNtech ECU Upgrade for the GLS 580S EQ Boost+ is 592 HP and 704 LB-FT. 

Notes:

• We have found the M176 engine stock performance numbers vary from the baseline figures claimed by Mercedes-Benz. We typically see higher baseline numbers than claimed by the factory.
• Power gains are calculated based on stock numbers measured by RENNtech. Crank Performance Numbers are calculated with a 17% Drivetrain loss on 4MATIC+ vehicles.
• Numbers published by MBUSA are an average over a 750rpm range for HP and a 2,000rpm range for TQ. Power gains are calculated based on the peak stock performance measured by RENNtech.
• Our numbers will be dependent on conditions and fuel quality. 93+ Octane gasoline is mandatory with this Performance Upgrade.
• States known for poor fuel quality have to be supplied with a lower power setup. Please call for details and Race fuel options +1-561-845-7888.

Performance Numbers Overview    GLS 580 EQ Boost (MY2020+ | X167 | M177 | 4.0L V8 BiTurbo EQ Boost) Stock Performance (at crank): Rated by Mercedes-Benz:                        483 HP @ 5,500rpm-6,500rpm; 516 LB-FT @ 2,000 - 4000 rpm Dyno measured by RENNtech:               524 HP @ 5,670rpm; 584 LB-FT @ 3,000rpm Note: Mercedes M176 engine performance when measured on the dyno obtains higher power numbers than rated from factory. Performance numbers published by MBUSA are a calculated average within a specific rpm range, which obviously result  in lower power numbers than at the peak. HP and TQ gains calculated by RENNtech are always based on peak stock results measured by RENNtech and upgraded peak results measured by RENNtech. For transparency and comparability, RENNtech published the average stock power during the rpm range set by MBUSA and the peak stock performance    GLS 580 EQ Boost (MY2021+ | X167 | M176 | 4.0L V8 BiTurbo EQ Boost) Modified Performance: Rated by RENNtech (peak @crank):              592 HP @ 5,110 rpm; 704 LB-FT @ 2,870 rpm Rated by RENNtech (peak @wheel):              491 whp @ 5,1100 rpm; 585 wtq @ 2,870 rpm Crank Performance Numbers are calculated with a 17% Drivetrain loss on 4MATIC+ vehicles.