Nforcd BMW 335i N55 Tuning UK – ECU Remap/ECU Flash/Chip Tuning | Custom Live Mapping, Hub Dyno Proven | Stage 1 400bhp / Stage 2 420bhp | 3 Series E90/E92/E93/F

BMW 335i N55 Performance Software Upgrade – Bespoke ECU Calibration, Dyno Proven

Give your BMW 335i N55 a serious step up in pace with our custom ECU calibration. This tailored engine software is built and refined on our hub dynamometer in Warwickshire to deliver crisp throttle response, strong mid-range pull and factory-smooth manners when cruising. Expect up to 400 bhp with our entry calibration and up to 420 bhp with our higher-output setup, subject to vehicle condition, fuel quality and suitable hardware.

Why this calibration

• Fully custom map for your specific car – not a generic file.
• Hub dynamometer and road validated for repeatable gains you can feel.
• Safety-first approach with comprehensive pre-tune health checks.
• Developed by experienced European calibrators for performance and reliability.
• Smooth, OEM-like drivability at light throttle with serious acceleration when you want it.

Power levels

• Level One: up to 400 bhp – ideal for a fast, dependable daily driver.
• Level Two: up to 420 bhp – for cars with appropriate supporting modifications focused on maximum performance.

Please note: figures are indicative and vary with vehicle condition, fuel and supporting hardware.

What is included

• Pre-mapping inspection and baseline power assessment.
• Bespoke ECU flash for the BMW 335i N55 on our hub dyno.
• Before and after power graphs so you can verify results.
• Optional features:
  • Cold start noise reduction delete option.
  • Adjustable burble overrun to suit your preference.
  • GTS-style start-up roar.
• ECU bench unlock available for later control units that cannot be written via the OBD diagnostic port.

How it feels

Stronger acceleration across the rev range, improved pedal response and a more engaging, effortless drive. We run this calibration on our own cars and customer feedback has been consistently excellent for both levels.

Our process

1. Initial vehicle health checks plus baseline dyno run.
2. Tailored ECU mapping for your BMW 335i N55.
3. Verification on the hub dyno and on-road where appropriate.
4. Handover with dyno printouts.

Fitting, dyno and booking

Professional installation and rolling road calibration is available at MJ Modifications in Warwickshire. To request a quote or book your BMW 335i N55 tuning, email info@mjmodifications.co.uk.

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