BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp — Stage 1 file (+44 hp)
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Stage 1 file for BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp
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Chip tuning for BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp ECU
BMW 4 Gran Coupé-series (2014 - F36) 35i Twinscroll (N55) 306 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 306 to 350 hp (+44 hp, +14%) and torque from 400 to 530 Nm (+130 Nm). This engine ships with different ECU variants: Bosch MEVD17.2, Bosch MEVD17.2.6, Bosch MEVD17.2.G, Bosch MEVD17.2.X. The flashing method is determined by the specific unit: OBD, Bench or Boot mode. TCU units on this engine: ZF 6HP EGS, ZF 8HPxx — each is calibrated with a separate file (torque limiter, shift maps for Stage 1). In the CHIPOK database: 6 configurations · 6 ECU variants. The 2014 generation — mid-generation petrol ECUs (MEDC17/MEVD17/Simos PCR), OBD flash on production revisions.
M GmbH is BMW's performance division, building M engines since 1972. The factory calibration on BMW petrol engines is conservative, leaving headroom for Stage 1 without hardware changes. Mid-generation petrol models use standard OBD flash. Third-party flash platforms are an industry of their own for the BMW community.
The BMW community is renowned for active tuning and a large pool of available Stage files. Stage 1 on BMW usually stays within the standard timeframe, with no particular difficulty on the standard models. On older and mid-generation BMWs, Stage 1 is flashed over OBD without Bench. The BMW premium segment is a high-output platform with Stage 2 potential. The hardware headroom allows a confident move to Stage 1 without changing the turbo. High-output engines deliver a solid gain with Stage 1 on stock hardware.
The TCU rarely needs recalibration up to Stage 1+, as the torque limiter usually copes with the Nm gain. The gearbox comes in versions by torque class, so its tolerance depends on the engine. BMW's main gearbox is a modern multi-speed automatic.
Frequently asked questions
How much does the power of the BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp increase after Stage 1?
The Stage 1 gain for the BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp is 44 hp (+14%) over the stock 306 hp, for a total of 350 hp. Torque rises from 400 to 530 Nm (+130 Nm).
What is Stage 1 chip tuning for the BMW 4 Gran Coupé-series?
Stage 1 chip tuning of the BMW 4 Gran Coupé-series is a rework of the ECU maps: boost pressure, ignition advance, target lambda and the removal of factory torque limiters. The gain is +44 hp with no hardware changes.
Is Stage 1 safe on the high-output BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp?
The high-output BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp has a conservative factory calibration aimed at the mass market. Stage 1 unlocks the engine's real potential while turbo and injector life are preserved.
How much does Stage 2 add on the BMW 4 Gran Coupé-series?
Stage 2 on the BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp means software + hardware (exhaust, intake, intercooler). The gain depends on the specific hardware combination.
Which ECUs are found on the BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp?
The BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp was fitted with different ECUs depending on the year and trim: Bosch MEVD17.2, Bosch MEVD17.2.6, Bosch MEVD17.2.G, Bosch MEVD17.2.X. The write method (OBD, Bench, Boot) is determined when the unit is read.
How many TCU units does the BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp have?
The BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp comes with 2 different automatic-transmission TCU units: ZF 6HP EGS, ZF 8HPxx. Each is calibrated with a separate file — torque limit, shift maps and launch control rpm for Stage 1.
What happens to the BMW 4 Gran Coupé-series warranty after chip tuning?
The factory warranty of the BMW 4 Gran Coupé-series does not remain valid after Stage 1 — the manufacturer withdraws its obligations once the ECU software is changed. CHIPOK provides its own warranty on its work and support.
How long does remapping the BMW 4 Gran Coupé-series take?
On the BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp: OBD flash 25-30 minutes, Bench (if required) about an hour. The file processing itself takes 5-30 minutes once the original bin is received.
Is the original file kept when chip tuning the BMW 4 Gran Coupé-series?
Yes, the original ECU firmware of the BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp is kept and can be flashed back at any time. Returning to stock via OBD takes 25-30 minutes.
What is the price of a Stage 1 remap for the BMW 4 Gran Coupé-series?
Stage 1 for the BMW 4 Gran Coupé-series 35i Twinscroll (N55) 306 hp is paid for with CHIPOK credits (1 cr = 1 €). The final amount is set in the calculator, taking the extra options (off functions) into account.