Stage 1 / Stage 2 Remap Service
Custom ECU calibration with live data logging — mobile across West & North London.
Stage 1 Remap
A Stage 1 remap is carried out on a standard, unmodified vehicle. We connect to your ECU, read the factory calibration file, and adjust the parameters BMW, VAG, Mercedes, or your manufacturer deliberately set conservatively — boost pressure targets, fuel rail pressure, torque limiters, injection timing, and throttle response maps. The adjusted file is written back to your ECU. No hardware changes. No parts. Software only.
Every job starts with a full diagnostic scan. If there are active fault codes or signs of mechanical issues — worn injectors, a tired turbo, timing chain symptoms — we flag it before tuning, not after.
Stage 2 Remap
Stage 2 is for vehicles with supporting hardware already fitted — larger intercooler, uprated injectors, or a hybrid turbo. The ECU file is written specifically around that hardware. Running a Stage 2 map on stock hardware is something we won’t do — the file has to match what the engine is actually breathing.
What “custom” means here
We don’t download a generic file and flash it. Your car’s ECU is read on the day, and the file is built from your live data — your engine’s actual boost response, your fuel quality, your current torque limiter thresholds. If your vehicle has 130,000 miles and shows slightly lower compression, that affects how we calibrate fuelling. A file built for a fresh vehicle is not the same file.
After flashing, we data log boost pressure, air-fuel ratio, and coolant temperature on the road. If the numbers are where they should be, the job is done. If they’re not, we adjust. You don’t leave until the data confirms it’s right.
Your original file is kept on record
Before any changes are made, we read and store a full copy of your ECU’s original calibration file. This is retained securely against your vehicle’s registration. If you ever sell the car, want to return to stock for a dealer visit, or simply change your mind, we can reload the original map at any time. There is no time limit on this — your file stays on our system indefinitely.
Want to understand exactly how ECU remapping works, what gets changed, and what results to expect? Read our guide: What Is Chip Tuning (ECU Remapping) and How Is It Done?.
Typical Stage 1 Results — Common Engines We Tune
| Engine | Car | Stock | Stage 1 | Gain |
|---|---|---|---|---|
| BMW N47 2.0d | 120d / 320d / 520d | 177 bhp / 350 Nm | ~215 bhp / ~430 Nm | +38 bhp / +80 Nm |
| BMW N57 3.0d | 530d / 730d / X5 30d | 258 bhp / 540 Nm | ~310 bhp / ~630 Nm | +52 bhp / +90 Nm |
| VAG 2.0 TDI CR | Golf / Passat / A4 | 150 bhp / 340 Nm | ~195 bhp / ~420 Nm | +45 bhp / +80 Nm |
| BMW B58 3.0T | 340i / 440i / M140i | 326 bhp / 450 Nm | ~400 bhp / ~560 Nm | +74 bhp / +110 Nm |
| Ford 2.0 EcoBoost | Focus ST / Mondeo ST | 250 bhp / 360 Nm | ~310 bhp / ~440 Nm | +60 bhp / +80 Nm |
| Mercedes OM654 2.0d | C220d / E220d / GLC 220d | 194 bhp / 400 Nm | ~235 bhp / ~480 Nm | +41 bhp / +80 Nm |
Figures are typical for a healthy engine on stock hardware. Results vary with engine condition, fuel quality, and ambient temperature. Every remap is verified with live data logging.
Frequently Asked Questions
Yes, ECU remapping is legal in the UK. However, the vehicle must remain roadworthy and compliant with MOT emissions requirements. Any modifications should also be declared to your insurance provider.
Yes. A professional remap always includes saving the original factory ECU software. The vehicle can be returned to stock at any time if required, for example before selling the car or returning a lease vehicle.
Not necessarily. Under normal driving conditions, many vehicles see equal or slightly improved fuel economy due to improved torque and efficiency. Fuel consumption will increase only if the additional power is used frequently.
It can be, provided the vehicle is mechanically sound. This is why pre-remap diagnostics are essential. A well-maintained high-mileage engine can safely benefit from a conservative Stage 1 ECU remap.
A properly tuned Stage 1 ECU remap should not cause MOT issues, as long as emissions systems remain intact and the vehicle passes emissions testing. Poor-quality remaps or removal of emissions equipment can lead to MOT failure.
Most Stage 1 ECU remaps take between 1-3 hours, depending on the vehicle and ECU type. Some models may take longer if bench or boot-mode access is required.
A custom ECU remap is generally superior to a tuning box. Remapping directly adjusts multiple engine parameters in a controlled way, whereas tuning boxes typically manipulate limited sensor signals and offer less precise control.