4.2 V8 FSI - 420ch Tuning
Audi RS4 — Detailed power and torque gains by stage.
Gains by stage(4)
Power
420 hp
Torque
410 Nm
essence
Power
420→440ch
+20 ch
+5%
Torque
410→455Nm
+45 Nm
+11%
OriginalTuned
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Everything about 4.2 V8 FSI - 420ch tuning
Tuning the 4.2 V8 FSI - 420ch found in the Audi RS4 is one of the most popular performance upgrades. This engine offers excellent potential for power and torque gains.
On ChiptuneMAP, find verified gain data for each stage, compare tuner prices and find the ideal professional for your project.
Gains summary by stage
On the Audi RS4 4.2 V8 FSI - 420ch, tuning delivers up to +60 hp and +90 Nm depending on the stage. Stock vs tuned figures:
| Stage | Power | Torque | Indicative price |
|---|---|---|---|
| Stage 1 | 420 → 440 hp | 410 → 455 Nm | — |
| Stage 2 | 420 → 480 hp | 410 → 500 Nm | — |
| E85 Flexfuel | 420 → 420 hp | 410 → 410 Nm | — |
| E85+ | 420 → 440 hp | 410 → 455 Nm | — |
Frequently asked questions
What gains can I expect from tuning the 4.2 V8 FSI - 420ch?
Tuning the 4.2 V8 FSI - 420ch (Audi RS4) delivers significant power and torque gains depending on the chosen stage. Stage 1, with no hardware modifications, offers the best gain-to-reliability ratio.
Is tuning reliable on the 4.2 V8 FSI - 420ch?
Yes, the 4.2 V8 FSI - 420ch is known for its reliability when tuned, especially at Stage 1. It's essential to use a certified tuner with maps tailored to your engine.
How much does Audi RS4 tuning cost?
Prices vary by stage and tuner. Check our directory to compare rates from professionals near you.
Should I get a tuning box or an ECU remap?
ECU remapping (modifying the engine control unit map) delivers better results and integration than a plug-in tuning box. It's customized for each engine.
How do I find a tuner for my Audi RS4?
Use the ChiptuneMAP directory to find a certified tuner near you. Compare reviews, prices and specialties.