BMW 320d Remap Southampton & Hampshire

BMW 320d Remap — Stage 1 Power, Torque & Drivability

The BMW 320d is one of the most remapped diesel saloons in the UK. Across the E90, F30 and G20 generations, the 2.0-litre four-cylinder turbodiesel (N47, then B47) has substantial headroom built in by BMW — conservative factory mapping leaves a clear gap to a Stage 1 remap. Whether you drive an EfficientDynamics, SE, Sport, M Sport, xDrive, Touring or LCI facelift, a Stage 1 remap is the single best-value upgrade you can make.

At Boostcore, we remap 320ds across Southampton, Hampshire, Eastleigh, Totton, Romsey, Fareham, Portsmouth and Winchester every week. The result is a sharper throttle, stronger mid-range pull, easier overtaking and — on a fuel-economy-leaning map — a measurable MPG improvement on longer runs.

Engine Generations We Remap

The 320d badge covers three very different engines, and the right remap file depends on which one is under the bonnet. We work with all three:

E90 (2005–2011) — N47D20, 163 bhp / 340 Nm (or 177 bhp from 2007). EDC17 ECU. Read via OBD.
F30 (2011–2019) — N47D20 / B47D20, 184 bhp / 380 Nm (LCI facelift raised it to 190 bhp). EDC17 (N47) or MD1 (B47 LCI). OBD read on most, bench on the very latest B47 protected ECUs.
G20 (2019–present) — B47D20, 190 bhp / 400 Nm. MD1CP004 / MD1CS001 ECU. Bench or OBD depending on ECU variant.

Each generation responds differently. The N47 is very well-understood, with a huge global file library and proven safe gains. The B47 is more tightly mapped from the factory and benefits from a more carefully developed file with attention to DPF, AdBlue and EGR operation. We confirm the exact ECU type and software level before quoting, so the file is matched to your specific car — not pulled from a generic library.

Real-World Gains

Example BMW 320d Stage 1 Remap Gains

Typical Stage 1 figures for the three 320d generations. Final figures depend on your specific ECU variant, fuel quality and vehicle condition — we confirm after diagnostics.

BMW 320d (E90, N47)

E90 2005–2011 · 2.0d N47D20

Stage 1

Generation: E90 2005–2011
Engine: 2.0d N47D20
ECU: EDC17
Fuel: Diesel

Power (BHP)

Standard 163 bhp

Tuned 215 bhp

+52 bhp (+32%)

Torque (Nm)

Standard 340 Nm

Tuned 420 Nm

+80 Nm (+24%)

The earliest 320d in the line-up and the one with the most to gain — a Stage 1 file opens up real headroom on the standard turbo and injectors.

BMW 320d (F30, N47 / B47)

F30 2011–2019 · 2.0d N47 / B47

Stage 1

Generation: F30 2011–2019
Engine: 2.0d N47 / B47
ECU: EDC17 / MD1
Fuel: Diesel

Power (BHP)

Standard 184 bhp

Tuned 235 bhp

+51 bhp (+28%)

Torque (Nm)

Standard 380 Nm

Tuned 460 Nm

+80 Nm (+21%)

The most common 320d on UK roads. The extra torque in 4th and 5th is what owners notice most — overtaking stops being a downchange.

BMW 320d (G20, B47)

G20 2019+ · 2.0d B47D20

Stage 1

Generation: G20 2019+
Engine: 2.0d B47D20
ECU: MD1CP004 / MD1CS001
Fuel: Diesel

Power (BHP)

Standard 190 bhp

Tuned 245 bhp

+55 bhp (+29%)

Torque (Nm)

Standard 400 Nm

Tuned 480 Nm

+80 Nm (+20%)

Tightly mapped from factory; the gains are noticeable even on a car that already feels quick. Bench work on the latest protected ECUs.

Figures shown are typical examples based on available tuning data for the 320d platform. Final results depend on vehicle condition, ECU type, fuel quality, software availability and suitability for tuning. Boostcore will confirm options after checking your vehicle details.

What you'll notice

What a 320d Stage 1 Feels Like

Mid-Range Pull

The biggest single difference. Around 2,000–3,500 rpm — the part of the rev range you actually use day-to-day — the 320d pulls harder and earlier. Overtaking on the M27 or A3 stops being a downchange-and-pray manoeuvre.

Sharper Throttle

BMW's drive-by-wire throttle is conservative on the 320d. A remap trims the pedal map, removing the delay between pressing the throttle and the engine responding. The car feels more eager, more connected.

Fewer Gear Changes

On the auto (ZF 8HP) you'll find the box holds gears longer and drops down less often. On a manual, you'll reach for third less in town. The flatter torque curve makes the engine usable lower in the rev range.

Better MPG on Long Runs

On an economy-leaning map, motorway MPG typically improves 5–10%. You'll see it most on long, steady runs (M3 to London, M27 to Portsmouth) where the engine doesn't have to work as hard to maintain speed.

How We Remap a 320d

The job takes around 60–90 minutes on a 320d, start to finish, and is done at your home or workplace anywhere in Southampton, Hampshire or the surrounding area. Here's what happens:

Pre-job diagnostic check. We read fault codes, check live data (boost pressure, DPF pressure, EGR position, injector corrections, maf readings) and confirm the engine is healthy enough to tune. If something's off — a tired injector, a sticky EGR, a clogged DPF — we'll flag it before writing any new software.
Read the original ECU file. Via the OBD port (E90, most F30) or on-bench (very latest B47 protected ECUs on later G20s). The original file is saved — this is your safety net and your return-to-stock file.
Write the Stage 1 file. Adjusted around your engine, your fuel and your goals (performance, economy, or a balance). We don't load generic maps — the file is calibrated to the platform and refined for the typical duty cycle of a 320d owner.
Post-job checks. We re-read fault codes, re-check live data, log a short road-test pull to confirm the car is pulling cleanly across the rev range, and hand the original file back to you on a labelled USB stick.

Total time on site: roughly an hour. You can work from home, watch, ask questions — whatever you prefer.

Compatibility & Hardware

Stage 1 vs Stage 2, and What You Don't Need to Change

Standard Hardware

Stage 1 is software-only. No new intercooler, no decat, no intake, no downpipe. The OEM turbo, injectors, DPF, EGR and AdBlue all stay. The car looks completely standard, which matters for warranty, insurance and resale.

Auto & Manual

We tune both the 6-speed manual and the ZF 8HP automatic 320d. The auto's torque limiters are recalibrated to handle the increased torque without the box protecting itself. We log the gearbox adaptation data after the remap.

xDrive & Touring

The xDrive and Touring variants tune the same as the saloon. The added weight of the Touring (around 80 kg) and the additional driveline of xDrive are well within the safety margin of a Stage 1 file.

DPF & EGR

Stage 1 keeps the DPF and EGR fully operational. No warning lights, no limp mode. The DPF regeneration cycle continues to run normally. If your DPF is already partially blocked, we may recommend a diagnostic clean first.

AdBlue / SCR

AdBlue dosing and SCR system are preserved. If your 320d is throwing AdBlue-related fault codes, we can diagnose and address those separately, but they aren't removed by a Stage 1 remap.

Stage 2 (Heads-Up)

Stage 2 — typically +80–110 bhp — requires hardware: a high-flow downpipe, an uprated intercooler, an intake, and often a clutch on manuals. We develop Stage 2 files in-house and quote on application once hardware is fitted.

Get a quote

How Much Does a 320d Remap Cost?

The honest answer is: it depends on the exact ECU variant and what you want. The cost varies between the older E90 / F30 N47 and the latest B47-protected G20 (which needs bench work), and every quote is all-in with no hidden extras.

Send us your registration with a quick message and we'll come back with the exact price for your specific 320d, plus a confirmed booking slot. No obligation, no deposit until you're happy.

Message Us For A Full Quote Check Your Specific Gains

All quotes include travel across Southampton and Hampshire, the pre-job diagnostic, the Stage 1 file, the post-job check, the original file on USB, and the same lifetime software warranty we offer on every remap.

Common Questions

BMW 320d Remap FAQs

Under UK consumer law, a manufacturer cannot void your entire warranty just because the car has been remapped — they have to prove the remap caused a specific failure. We save your original ECU file, and if you ever need a return-to-stock for a warranty claim, the file is restored to factory condition in about 20 minutes. We also offer a return-to-stock service separately if you need it.

You must declare the remap to your insurer. Most UK insurers either accept it with no premium change (common with mainstream providers) or charge a small uplift. We've never seen a remap-only claim refused. If your insurer asks, the file is calibrated to OEM safety levels and is fully reversible — we can return the car to stock in about 20 minutes.

No. Stage 1 keeps the DPF, EGR and AdBlue system fully operational. Regeneration cycles continue as normal, no warning lights, no limp mode. The 320d's emissions equipment is left in place. If your DPF is already showing signs of blockage (regen too often, pressure high), we'll flag it during the pre-job diagnostic and recommend a clean before tuning.

Around 60–90 minutes on a 320d from start to finish, including the pre-job diagnostic, the ECU read/write, the post-job check and a short road test. The car is off the road for about an hour in total.

Yes — fully and at any time. We keep your original ECU file (and hand it to you on USB) so the car can be returned to factory standard in about 20 minutes. We also offer a return-to-stock booking service for customers who want us to handle it for them — useful for dealers and trade customers.

Related Boostcore Services

ECU Remapping

Full overview of our ECU remapping service for cars, vans and commercial vehicles.

Economy Remap

MPG-focused map for diesel drivers covering high motorway miles.

DPF & EGR Solutions

Diagnostics, fault finding and repair-focused solutions for diesel warning lights and limp mode.

Vehicle Gains Lookup

Estimate Stage 1 power and torque gains for your specific car.

Return To Stock

Restore your ECU to factory software — useful for warranty work, sales or trade.

What Is ECU Remapping?

Beginner-friendly guide to what remapping is, how it works, and what to look for.

Other Vehicles We Remap

Popular Vehicles We Remap

Boostcore remaps a wide range of turbocharged petrol and diesel cars, vans and commercial vehicles. Here are two more popular platforms we see regularly across Southampton and Hampshire.

VW Golf GTI Mk7 Remap

Stage 1 EA888 Gen 3 2.0 TSI remap with optional DSG TCU re-cal. Typical +80 bhp and +100 Nm.

Ford Transit Custom Remap

Stage 1 2.0 TDCi EcoBlue remap for 105, 130, 170 and 185 bhp variants — manual and 10-speed auto.

Ready to book?

Talk to Boostcore About Your Vehicle

Get a tailored quote, check estimated power and torque gains, or pay a booking deposit to secure your slot. Mobile service available across Southampton, Hampshire and surrounding areas.

Check Power Gains Get a Quote Book Deposit £50