40i - 326ch Tuning
BMW 4-serie — Detailed power and torque gains by stage.
Gains by stage(4)
Power
326 hp
Torque
450 Nm
essence
Power
326→420ch
+94 ch
+29%
Torque
450→580Nm
+130 Nm
+29%
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Everything about 40i - 326ch tuning
Tuning the 40i - 326ch found in the BMW 4-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 4-serie 40i - 326ch, tuning delivers up to +134 hp and +190 Nm depending on the stage. Stock vs tuned figures:
| Stage | Power | Torque | Indicative price |
|---|---|---|---|
| Stage 1 | 326 → 420 hp | 450 → 580 Nm | — |
| Stage 2 | 326 → 460 hp | 450 → 640 Nm | — |
| E85 Flexfuel | 326 → 326 hp | 450 → 450 Nm | — |
| E85+ | 326 → 420 hp | 450 → 580 Nm | — |
Frequently asked questions
What gains can I expect from tuning the 40i - 326ch?
Tuning the 40i - 326ch (BMW 4-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 40i - 326ch?
Yes, the 40i - 326ch 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 4-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 4-serie?
Use the ChiptuneMAP directory to find a certified tuner near you. Compare reviews, prices and specialties.