BHP+20 hp (5%)
Standard
420 hp
Tuned
440 hp
Torque+25 Nm (6%)
Standard
430 Nm
Tuned
455 Nm
Suitability
Limited (3.5/10)Gains Profile
Limited headroomHeadroom
LowAudi RS4 4.2 FSI V8 420hp ECU Remapping
Considering an ECU remap for your Audi RS4 4.2 FSI V8 420hp? A Stage 1 remap can take this B7 - 2004 - 2008 petrol engine from 420 BHP to 440 BHP and from 430 Nm to 455 Nm of torque (naturally aspirated). This engine scores 3.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your Audi RS4 can achieve.
How this engine compares
- 5thof 5 Audi RS4 engines by power gain
- 14%of the 9,842 engines we hold gain data for see a smaller power increase
- 14%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
The Audi RS4 4.2 FSI V8 420hp is a 4.2L naturally aspirated petrol engine producing 420 BHP and 430 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 440 BHP and 455 Nm — a gain of around 20 BHP (5%) and 25 Nm (6%).
This engine has limited remap suitability, though the available headroom is limited, so gains are modest compared to higher-output variants. The tuning headroom is classified as limited, based on the percentage gain available from the factory output.
From a technical perspective, the ECU is typically a Bosch MED9/MED17 (varies), and the transmission is manual and dsg/s tronic automatics are common depending on model/engine. some dsg/dual-clutch gearboxes have torque management; calibration may be torque-limited. at this torque level, transmission and driveline servicing history becomes especially important..
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.. High tuned torque: check transmission torque capacity and service history.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.
Considerations
!Naturally aspirated engine: gains are usually limited; results vary widely.
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