BMW 4 Series GC · Stage 1

BMW 420d Stage 1 Remap

Name: BMW 420d Stage 1 Remap
Brand: BMW

On BMW 420d diesel engines a Stage 1 remap recalibrates the fuel quantity, injection timing, boost pressure and torque limiter maps. No hardware is changed and the original software is backed up. The same engine is sold with different stock outputs across generations, so the gain depends on your version.

How much bhp does BMW 420d chip tuning add?

It depends on the generation and the stock output. 420d engines with 163–190 bhp reach 220 bhp with a Stage 1 remap; the largest gain is +57 bhp (F36 420D 163hp). Pick your version in the table below.

Book an appointment BMW 4 Series GC: all engines & Stage 1

BMW 420d: Stage 1 figures by generation and year

Year / chassis: F36 - May/2016+

Engine	Power	Torque	Gain
BMW 4 Series GC 420D 190hp	190 → 220 bhp	400 → 440 Nm	+30 bhp

Year / chassis: F36 - 2014 - 2016

Engine	Power	Torque	Gain
BMW 4 Series GC 420D 163hp	163 → 220 bhp	380 → 440 Nm	+57 bhp
BMW 4 Series GC 420D 184hp	184 → 220 bhp	380 → 440 Nm	+36 bhp

In Taiwan

Where can this be done near you?

GP Power ECU applies the software at its workshop in Hukou, Hsinchu, using EcuPrime-developed files; workshops can also order the file directly.

ENGINE FAMILY

About the BMW 2.0 diesel (N47 and B47: 116d, 118d, 120d, 318d, 320d, 520d, X1, X3)

BMW's four-cylinder 2.0 diesel is the brand's most common engine, used in the 1, 2, 3, 4 and 5 Series and X1, X3 and X4 as the N47 (2007–2014) and B47 (2014 onwards), from 116 to 231 hp. Hardware is largely shared across outputs.

How a Stage 1 remap works on the BMW 420d

Stage 1 recalibrates rail pressure, injection, boost and the torque limiter. The gain is especially clear on the 116d, 118d, 316d and 318d outputs. A full low-rev torque curve results, matched to the 8-speed automatic; the character moves towards the next output up.

Pre-remap checklist

Timing chain and tensioner on the N47 (located at the back of the engine, a known issue).
Swirl flap mechanism and EGR cooler.
DPF load and, on the B47, the AdBlue system.
Boost leaks and intercooler hoses.

This section is based on GP Power ECU workshop experience; the power and torque figures come from the catalogue measurement above.

Frequently asked questions

How much bhp does BMW 420d chip tuning add?

It depends on the generation and the stock output. 420d engines with 163–190 bhp reach 220 bhp with a Stage 1 remap; the largest gain is +57 bhp (F36 420D 163hp). Pick your version in the table below.

What is the difference between Stage 1 and Stage 2 on the BMW 420d?

Stage 1 is software only: no part of the car is changed and the figures in the table apply to this software. Stage 2 is software prepared for hardware changes such as the exhaust, intercooler or intake; the hardware comes first, then the software.

Will chip tuning damage the engine?

No. Values stay inside the safety margin the manufacturer leaves; engine, gearbox and turbo limits are not exceeded. Every file is verified with a road test and data logging. If the car needs maintenance first (worn injectors, blocked filter, weak clutch) we tell you before starting.

Will my fuel consumption go up?

With the same driving style it usually drops, because you hold the same speed at lower revs and less throttle. If you use the extra power, consumption naturally rises. It is down to your right foot.

How long does it take? Do I leave the car?

Most cars take 1–2 hours and you get the car back the same day; no need to leave it. Some models need the ECU removed, which takes longer — we tell you when booking.

Can I go back to stock later?

Yes. The original file is read and archived before any work. We restore the factory software free of charge whenever you ask.

What is checked on the BMW 420d before remapping?

Before working on the BMW 2.0 diesel (N47 and B47: 116d, 118d, 120d, 318d, 320d, 520d, X1, X3) we check: Timing chain and tensioner on the N47 (located at the back of the engine, a known issue). Swirl flap mechanism and EGR cooler. DPF load and, on the B47, the AdBlue system. Boost leaks and intercooler hoses. If something needs attention, maintenance comes first; the remap is applied to a healthy engine.