Exclusively BMW & VAG Performance Tuning Specialists
The N57 35d is one of BMW's finest engines – but it leaves serious performance on the table from the factory. With over 14 years specialising exclusively on the N57 platform, we build every tune completely
from the ground up on the dyno. Customers travel from all over the UK to have their car tuned by us.
BMW 335d & 435d Remap - 385-390bhp Dyno Proven Results
Unlock the full potential of your BMW 335d or 435d with a custom ECU remap from DC Remapping UK. Our N57 diesel tuning packages deliver dyno-proven gains of 385–390bhp and up to 750-780Nm of torque all from your factory engine, with no reliability compromise.
What Is a BMW 335d / 435d Remap?
The BMW 335d and 435d both use the N57 3.0-litre twin-turbo diesel engine, one of the most remapping-friendly engines BMW has ever produced. From the factory, BMW deliberately limits the engine's output to protect powertrain components under warranty and to differentiate the range from more expensive models. A professional ECU remap from DC Remapping UK rewrites the engine management software to optimise boost pressure, fuel delivery, injection timing, and torque limiters. The result is a significantly more responsive, more powerful, and in many cases more fuel efficient vehicle, all using your standard hardware.
What's Included With Every BMW 35d Remap
🔬 Custom-Written ECU File Every remap is written specifically for your car — not a generic file pulled from a database. We account for your fuel quality, hardware condition, and driving style.
📈 Rolling Road (Dyno) Session Your car is strapped to our in-house 4WD linked rolling road before and after the remap so you see exactly how much power and torque we've added. You leave with your printed dyno sheet.
🔧 Pre-Remap Vehicle Health Check We check for fault codes, boost leaks, and turbo health before touching your ECU. If something's wrong, we tell you — no nasty surprises.
📄 Before & After Dyno Sheet You receive a printed copy of your power run showing stock and remapped figures side by side. Proof you can show at meets, track days, or when selling the car.
🔒 Secure File Backup Your original factory ECU file is backed up before we begin. Your map can be reinstated at any time if you ever need to return to stock.
💬 Lifetime Tuning Support Got a question six months after your remap? We're here. All customers get ongoing support for the life of their tune.
How It Works
-
Get a quote — enter your reg and we'll send expected gains and pricing.
-
Book in — choose a slot online; 0% finance available.
-
Custom tune — we map and verify on the dyno, typically 2–3 hours.
-
Drive away — smoother power, stronger torque, a sharper car.
Why BMW Owners Choose DC Remapping UK
We're not a generalist garage that remaps everything from tractors to lorries. DC Remapping UK focuses exclusively on BMW and VAG Group vehicles and that specialisation shows in our results.
Our technicians have mapped hundreds of N57-equipped BMWs. We know exactly where the factory limits sit, which parameters respond best to adjustment, and what the real-world reliability ceiling looks like on a standard drivetrain. That knowledge is what separates a safe 390bhp tune from a damaging one.
Every car we work on is dyno-tested, not bench-tested. We don't quote numbers we haven't physically achieved on our rolling road. The 385–390bhp figure on this page is a result we've hit repeatedly on multiple N57 vehicles not a theoretical maximum from a brochure.
Visit us: DC Remapping UK, Unit 20 Trinity Court, Birchwood, Warrington, Cheshire, WA3 6QT — minutes from the M6, M62 and M56, serving Warrington, Birchwood, Risley and the surrounding Northwest.
Tel: 01925 819002 · sales@dcremappinguk.com
What Our BMW 35d Customers Say
★★★★★ — "Had my BMW 335d F31 remapped to Stage 2. The before and after dyno results were unbelievable — nearly 80bhp gained and the car pulls like a train from 1,500rpm. Professional service from start to finish." — James H., BMW 335d Touring
★★★★★ — "Took my 435d xDrive in for an engine and xHP gearbox combo. The difference in shift speed and throttle response is night and day. DC Remapping clearly know the N57 inside out. Highly recommended." — Mike T., BMW 435d xDrive Coupé
★★★★★ — "Really impressed with how thorough the process was. They checked the car over first, showed me the stock dyno run, did the remap, then showed me the after figures. 387bhp on the sheet. Absolutely chuffed." — Rachel S., BMW 335d Saloon
BMW 335d & 435d Remap - Frequently Asked Questions
How much power does a BMW 335d remap add?
A remap of the BMW 335d depending on the stage selected. A Stage 1 remap brings the N57 engine to approximately 385/390bhp (from 313bhp stock). A Stage 2 remap can achieve 400/410bhp with up to 830Nm of torque, as demonstrated on DC Remapping UK's in-house rolling road.
Will remapping my BMW 335d void the warranty?
If your BMW is still under a manufacturer warranty, a remap will technically void the powertrain warranty in the remapped areas. Most 335d and 435d models are now out of BMW manufacturer warranty, meaning this is not a concern for the majority of owners. If you are within a used-car dealer warranty period, check the terms before proceeding.
Is a BMW 335d remap safe?
Yes, when performed by a specialist with experience on the N57 platform. The N57 twin-turbo diesel is a robust engine with significant headroom above stock figures. DC Remapping UK conducts a pre-remap vehicle health check on every car and works within safe parameters that have been tested across hundreds of N57 builds. All our remaps are dyno-verified before and after.
How long does a BMW 335d remap take?
A Stage 1 remap typically takes 2–3 hours including the pre-remap health check and dyno session.
Can I remap my BMW 335d and also do an xHP gearbox tune?
Yes and we recommend doing both together. The N57 engine remap and xHP ZF8 gearbox flash complement each other perfectly. You can book both as our combined Engine & Gearbox package, which includes a discount compared to booking separately. The xHP tune adjusts shift firmness, shift speed, launch control, and driving mode behaviour.
Yes and we recommend doing both together. The N57 engine remap and xHP ZF8 gearbox flash complement each other perfectly. You can book both as our combined Engine & Gearbox package, which includes a discount compared to booking separately. The xHP tune adjusts shift firmness, shift speed, launch control, and driving mode behaviour.