Remote ECU tune · 4.2L naturally aspirated V8 (EA824 FSI)
A custom Stage 1, 2 or 3 calibration for your Audi RS4 / RS5 4.2 FSI (B8 / B8.5), built by hand by a real tuner from your own stock file and datalog, and back with you within three hours of the file arriving. We tune these cars remotely, worldwide: you read and flash with your own HP Tuners interface, and you pay only once the tune is delivered.
Stock vs tuned
From the factory the Audi RS4 / RS5 4.2 FSI (B8 / B8.5) makes 444 hp and 317 lb-ft (430 Nm). A Stage 1 tune typically adds 15–20 hp and 11–22 lb-ft, for around 459–464 hp in total. With bolt-ons and a Stage 2 calibration that grows to +20–35 hp, and a Stage 3 build — bolt-on supercharger kit + intercooler — typically lands at 544–574 hp.
| Stage | Added power | Added torque | Total power | Total torque |
|---|---|---|---|---|
| Stock | — | — | 444 hp | 317 lb-ft (430 Nm) |
| Stage 1 | +15–20 hp | +11–22 lb-ft (+15–30 Nm) | 459–464 hp | 328–339 lb-ft (445–460 Nm) |
| Stage 2 | +20–35 hp | +11–33 lb-ft (+15–45 Nm) | 464–479 hp | 328–350 lb-ft (445–475 Nm) |
| Stage 3 | +100–130 hp | +89–118 lb-ft (+120–160 Nm) | 544–574 hp | 406–435 lb-ft (550–590 Nm) |
Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
Tuner's notes
As a naturally aspirated engine, software alone adds only about 15-20 hp, mostly by raising the rev limit and changing ignition timing.
Supported versions
HP Tuners lists 2 Audi RS4 / RS5 4.2 FSI (B8 / B8.5) entries covering 2010–2017, with 4.2-litre engines. Interface: MPVI2 or newer.
| Years | Model / engine as HP Tuners lists it | Controller | Credits | Interface |
|---|---|---|---|---|
| 2010–2017 | RS5 4.2L FSI (B8/B8.5) (MED17.1.1) | Engine | 6 | MPVI2/2+/3/4 |
| 2012–2017 | RS4 4.2L FSI (B8.5) (MED17.1.1) | Engine | 6 | MPVI2/2+/3/4 |
Support data per HP Tuners' supported-vehicle list (June 2026). Check your exact car on HP Tuners' vehicle list before you buy credits.
Stages & prices
One flat price per stage, the same for every car: $250 for Stage 1, $450 for Stage 2 and $650 for Stage 3. Ordering is free and you pay only once the finished tune is delivered. 2 free revisions are included with every order. Gearbox (TCM) shift tuning is included wherever your car's transmission controller can be accessed.
Software only. Every map in the MED17.1.1 is recalibrated for the Audi RS4 / RS5 4.2 FSI (B8 / B8.5) as it sits today — spark, fuelling, throttle response and limiters — against the datalog you send.
For a Audi RS4 / RS5 4.2 FSI (B8 / B8.5) with bolt-ons fitted — intake, exhaust, headers or downpipe, and an intercooler where the car has one. The airflow and fuelling are rebuilt around the hardware you actually have.
Stage 3 on the Audi RS4 / RS5 4.2 FSI (B8 / B8.5) means bolt-on supercharger kit + intercooler. The fuel, spark and boost maps are written from scratch for your exact combination.
Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
Before you order
How it works
FAQ
Typically 15–20 hp and 11–22 lb-ft (15–30 Nm) over the stock 444 hp, for around 459–464 hp in total. Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
An HP Tuners interface (we recommend the MPVI4), the HP Tuners credits needed to license the MED17.1.1 for writing, and your stock file plus a datalog of a drive. You read and flash the car yourself; we build the calibration.
Your custom tune is delivered within three hours of your stock file arriving. Six tuners work three shifts, so a file that lands in the middle of the night is picked up just as fast.
Stage 1 is $250, Stage 2 is $450 and Stage 3 is $650, flat. Ordering is free and you pay only once the finished tune is delivered. 2 free revisions are included with every order.
Stage 3 on the Audi RS4 / RS5 4.2 FSI (B8 / B8.5) means bolt-on supercharger kit + intercooler. The maps are written from scratch for your build, and typical results are 100–130 hp over stock. Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
