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RENNtech ECU+ Upgrade | Aston Martin | DBX V8 | 644 HP / 676 LB-FT | 4.0L V8 BiTurbo | M177 | MY2021+

ECU+ Upgrade | Up to 644 HP / 676 LB-FT | Gains: +102 HP & +94LB-FT
Retail price without tax: $3,480.00
aston martin dbx dyno

RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980s! Our experience, countless hours of in-house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability.

The Aston Martin DBX is powered by by one of Mercedes-Benz most powerful and successful engines, the M177. Developed by Mercedes-AMG this 4.0L V8 BiTurbo is used in a variety of models, including the AMG GT Family, E 63 AMG, S 63 AMG, C 63 AMG and many more. The experience gained on the Mercedes-AMG helped RENNtech to develop one of the most powerful ECU Upgrades for the Aston Martin on the market.

RENNtech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicle's entire power band. By modifying ignition timing and throttle mapping, optimizing air-to-fuel ratios, increasing the engine's rev limiter and modifying boost mapping for turbo-charged vehicles, RENNtech performance software unleashes the true potential of your Aston Martin.

With the proprietary RENNtech ECU Tuning the Aston Martin DBX V8 gains up to +102 HP and +94 LB-FT, based on power numbers measured by RENNtech. Please note that the Mercedes M177 engine performance when measured, obtains higher numbers than rated from factory. The maximum power number reached with the RENNtech ECU Upgrade for the Aston Martin DBX V8 is 644 HP and 676 LB-FT.




  • We have found the M177 engine stock performance numbers vary from the baseline figures claimed by Aston Martin. 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 16% Drivetrain loss on AWD vehicles.
  • Numbers published by Aston Martin 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 


Aston Martin DBX V8 (MY2021+ | M177 | 4.0L V8 BiTurbo) Stock Performance (at crank):

  • Rated by Aston Martin (avg.):                        542 HP @ 5,500-6,250rpm; 557 LB-FT @ 1,750-4,500rpm
  • Dyno measured by RENNtech (peak):               554 HP @ 5,450rpm; 582LB-FT @ 3,050rpm
    • Note: Mercedes M177 engine performance when measured on the dyno obtains higher power numbers than rated from factory. Performance numbers published by Aston Martin 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.  

Aston Martin DB V8 (MY2021+ | M177 | 4.0L V8 BiTurbo) Modified Performance (at crank):

  • Rated by RENNtech (peak @crank):              644 HP @ 6,150rpm; 676 LB-FT @ 3,350rpm
  • Rated by RENNtech (peak @wheel):              541 whp @ 6,150rpm; 568 wtq @ 3,350rpm
    • Crank Performance Numbers are calculated with a 16% Drivetrain loss on AWD vehicles.

For detailed explanation on crank HP, wheel HP, drivetrain loss, etc. please click here.


Dyno-Graph for Performance measured at the wheels:


Contact us

7825 SW Ellipse Way, Stuart, FL 34997
(+1) 561 - 845 7888
Mon - Fri 9am - 6pm


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7825 SW Ellipse Way - Stuart, FL 34997
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