BMW 4-serie M40i 374 hp — Stage 1 file (+46 hp)
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Stage 1 file for BMW 4-serie M40i 374 hp
Target +0 hp. Custom development for your engine.
Chip tuning for BMW 4-serie M40i 374 hp ECU
BMW 4-serie (2019 - G22-G23) M40i 374 hp — premium petrol engine of the passenger segment of the BMW Group (Mini, Rolls-Royce, BMW Motorrad) group (Германия, 1916). Stage 1 chip tuning raises power from 374 to 420 hp (+46 hp, +12%) and torque from 500 to 580 Nm (+80 Nm). This engine ships with different ECU variants: Bosch MG1CS003, Bosch MG1CS201. The flashing method is determined by the specific unit: OBD, Bench or Boot mode. TCU units on this engine: ZF 8HPxx, ZF 8HPxx-Gen3 — each is calibrated with a separate file (torque limiter, shift maps for Stage 1). In the CHIPOK database: 4 configurations · 4 ECU variants. A modern petrol engine built in 2019 — a generation with encrypted ECU protection (Tricore TPROT); top engines require Bench.
BMW is a premium manufacturer from Munich, founded in 1916 as an aircraft-engine works. The factory calibration on BMW petrol engines is conservative, leaving headroom for Stage 1 without hardware changes.
The BMW community is renowned for active tuning and a large pool of available Stage files. Top BMW engines confidently reach Stage 2 with a downpipe + intake + intercooler. Protection on top BMW models is the toughest in the group and requires Bench. Bench reading is the standard procedure for top engines in modern models. Top BMW engines sit at the power ceiling, and the gain is significant. A well-known base once hardware is added (downpipe + intake + intercooler).
The gearbox comes in versions by torque class, so its tolerance depends on the engine. Mini and FWD compacts use a different TCU platform with its own tooling base. BMW's main gearbox is a modern multi-speed automatic.
Frequently asked questions
What power gain do you get after chip tuning the BMW 4-serie M40i 374 hp?
After Stage 1 the power of the BMW 4-serie M40i 374 hp rises from 374 to 420 hp, a gain of 46 hp (+12%). Torque rises from 500 to 580 Nm (+80 Nm).
How does Stage 1 differ from stock on the BMW 4-serie?
Stage 1 on the BMW 4-serie M40i 374 hp is a software ECU calibration with no hardware changes. The key maps (boost/ignition/lambda/torque) are adjusted while factory tolerances are preserved. The gain is +46 hp with no hardware changes.
What does Stage 1 give on the top-spec BMW 4-serie M40i 374 hp?
Stage 1 for the BMW 4-serie M40i 374 hp unlocks the potential built in by the factory but artificially capped to meet mass-market targets. A base of 750-800 hp is achievable once hardware is added.
How does Stage 2 differ from Stage 1 on the BMW 4-serie M40i 374 hp?
Stage 2 on the BMW 4-serie M40i 374 hp means software + hardware (exhaust, intake, intercooler). The gain depends on the specific hardware combination.
How many ECU variants does the BMW 4-serie M40i 374 hp have?
The BMW 4-serie M40i 374 hp has 2 ECU variants: Bosch MG1CS003, Bosch MG1CS201. Before flashing you need to read the specific unit — calibration is done for the exact hardware/software.
Which TCUs are found on the BMW 4-serie M40i 374 hp?
The BMW 4-serie M40i 374 hp was fitted with different automatic-transmission units: ZF 8HPxx, ZF 8HPxx-Gen3. All are supported via Bench reading; the Stage 1 calibration is done for the specific TCU after the revision is identified.
Does Stage 1 void the warranty on the BMW 4-serie?
Stage 1 on the BMW 4-serie voids the factory warranty on the engine and transmission — this is standard for all manufacturers. CHIPOK provides its own warranty on the quality of the remap.
How quickly is chip tuning of the BMW 4-serie M40i 374 hp done?
The full remap cycle for the BMW 4-serie — from reading to writing the final file — takes 30-90 minutes depending on the ECU access method. The file is prepared at CHIPOK in 5-30 minutes.
Can you return to stock after Stage 1 on the BMW 4-serie?
The original BMW 4-serie ECU is always saved before flashing. Rolling back to the factory firmware is done with the same programmer in 25-30 minutes.
How much does Stage 1 cost for the BMW 4-serie M40i 374 hp?
The cost of Stage 1 for the BMW 4-serie M40i 374 hp is calculated in the calculator on this page — you select the options (DPF off, EGR off, AdBlue off, DTC off, etc.) and the price is capped by the package Max Price. Payment is by credits (1 cr = 1 €), with no subscriptions.