4.0i V8 - 420ch Tuning
BMW 3-serie — Detailed power and torque gains by stage.
Gains by stage(4)
Power
420 hp
Torque
400 Nm
essence
Power
420→446ch
+26 ch
+6%
Torque
400→430Nm
+30 Nm
+8%
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Everything about 4.0i V8 - 420ch tuning
Tuning the 4.0i V8 - 420ch found in the BMW 3-serie 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 BMW 3-serie 4.0i V8 - 420ch, tuning delivers up to +70 hp and +70 Nm depending on the stage. Stock vs tuned figures:
| Stage | Power | Torque | Indicative price |
|---|---|---|---|
| Stage 1 | 420 → 446 hp | 400 → 430 Nm | — |
| Stage 2 | 420 → 490 hp | 400 → 470 Nm | — |
| E85 Flexfuel | 420 → 420 hp | 400 → 400 Nm | — |
| E85+ | 420 → 446 hp | 400 → 430 Nm | — |
Frequently asked questions
What gains can I expect from tuning the 4.0i V8 - 420ch?
Tuning the 4.0i V8 - 420ch (BMW 3-serie) 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 4.0i V8 - 420ch?
Yes, the 4.0i V8 - 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 BMW 3-serie 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 BMW 3-serie?
Use the ChiptuneMAP directory to find a certified tuner near you. Compare reviews, prices and specialties.