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4.0 TFSI S8 ECU Tune
Purchase 4.0 TFSI S8 ECU Tune
  • SKU: 4L_TFSI_S8_ECU_Tune

    4.0 TFSI S8 ECU Tune

  • Advertised gains are estimates of HP and Torque “at the engine” calculated from gains as measured on a Dynojet Dynamometer in ideal conditions and typically show the largest possible change.  Actual gains are dependent on the following: Learn More

    Model – Manufacturers use the same engine in multiple model vehicles and often times they are in a different state of tune, for example: 2008 C63 and a 2008 CLK Black Series.  Both have the same engine, but the C63 has 451hp while the CLK63 has 500hp.  Naturally the C63 will show more gains as it starts at a lower level.

    Model Year – Similar to above, as time progresses, Manufacturers tend to slightly increase power output via software from one year to the next or offer “Performance Packages” with increased power.  The engines remain largely unaltered and as a result, final tuned output remains the same, while the gains are lower as the starting point is now higher.

    Fuel – Fuel quality is HIGHLY important with performance vehicles.  Low quality and/or low octane fuel will greatly impact engine output and potentially even engine health.  Top tier brand premium fuels should always be used to achieve the best results possible.

    Drivetrain – All wheel drive has higher drivetrain losses than rear wheel drive.  This results in lower numbers when testing on a chassis dyno.  Wheel/tire size and weight will also impact chassis dyno results

    Weather/Conditions – Temperature, humidity, altitude, and air density all impact engine performance.  Heat, high humidity, and thin air will all work towards reducing engine output

    Engine Health – Higher miles tends to result in increased build up and lower compression which can and will impact engine output.  Properly maintained engines will have better performance than abused or neglected engines.

    Supporting modifications – The highest power levels require supporting modifications.  Depending on the engine, this could mean forged internals, built transmission, upgraded fuel system, 110+ octane race fuel, etc.

  • $2,499.00 $2,124.15

    Black Friday 15% Off: $374.85

  • Prop 65 warning

    This product can expose you to chemicals including carbon black, silica - crystalline, formaldehyde, and lead which are known to the State of California to cause cancer, and lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

Weistec Horsepower 689
Weistec Torque 738
Manufacturer Weistec
Street legal in all the US States No
Engine Family 4.0L TFSI
Stock Horsepower 576
See more
year make model trim engine
2018 Bentley Flying Spur S (D1) Twin Turbo 4L V8 (TFSI)
2017 Bentley Flying Spur S (D1) Twin Turbo 4L V8 (TFSI)
2020 Bentley Flying Spur Base (MSB) Twin Turbo 4L V8 (TFSI)
2019 Bentley Flying Spur Base (MSB) Twin Turbo 4L V8 (TFSI)
2018 Bentley Flying Spur Base (D1) Twin Turbo 4L V8 (TFSI)
2017 Bentley Flying Spur Base (D1) Twin Turbo 4L V8 (TFSI)
See more

ECU Tuning Process: How do I get my ECU tuned?

The 4.0L TFSI engine is a potent and capable powerplant in addition to being paired to the famous AWD systems Audi/Porsche are known for.  Through rigorous testing on both the street and dyno, the Weistec 4.0 TFSI ECU Upgrade for the 4.0 Liter Twin Turbo V8 engines reliably extracts massive gains in the mid range of the powerband as well as substantial gains in the top end making it a top performer in all driving situations.  

Toggle between W.1 and W.2 above to see various levels of power gains achievable with our tuning. 

ECU Tuning Process: How do I get my ECU tuned?

Key Features:

  • Increased Boost
  • Optimized Fueling
  • Optimized Ignition Timing
  • Removed Speed Limiter
  • Increased Cruise Control Speed Limit
  • Removed Neutral Rev Limit
  • Optional Burble
*Power gains vary based on model, modifications, fuel, and running conditions.