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Every car ›Mercedes
Make · Maidstone, Kent · Est. 2011
Mercedes ECU remapping733 engines on file, each with its standard and Stage 1 figures.
Pick the model, then the engine, and you get what it makes as standard, what Stage 1 does to it and the parts that fit it. Or put the registration in and we find the engine for you.
733Engines
+22%Typical Stage 1 gain
+150 bhpBiggest gain
353 / 350Diesel / petrol
Models
Mercedes models we tune
A49 engines
AMG GT10 engines
AMG GT 4-door Coupé4 engines
B29 engines
C107 engines
Citan6 engines
CL14 engines
CLA32 engines
CLC5 engines
CLK15 engines
CLS39 engines
E100 engines
G18 engines
GL15 engines
GLA28 engines
GLB9 engines
GLC21 engines
GLE20 engines
GLK14 engines
GLS8 engines
Maybach3 engines
ML21 engines
R10 engines
S50 engines
SL20 engines
SLC6 engines
SLK11 engines
SLR1 engine
SLS1 engine
Sprinter22 engines
V7 engines
Vaneo3 engines
Viano8 engines
Vito24 engines
X3 engines
Biggest Stage 1 gains
Where Stage 1 makes the most difference on a Mercedes
Mercedes remapping
What a Mercedes remap actually does
A remap rewrites the software in your car's engine ECU. On a modern turbocharged Mercedes that is worth around +22% on power and more again on torque, and on the strongest Mercedes engines we hold it is as much as +150 bhp. The peak figure is the part people quote, but it is not the part you feel. What you notice on the road is torque arriving earlier, a sharper response to the throttle and a much wider band of usable power, so the car pulls where you actually drive it instead of only at the top.
We hold data for 733 Mercedes engines across 35 models, 353 diesel and 350 petrol, each with its standard and Stage 1 figures. Put your registration in and we will show you yours rather than a range.
Every file is written for the specific engine and proven on our own Mustang AWD rolling road here in Maidstone. We keep your original file, so the car can be put back to standard at any point.
Stage 1
Software only
No hardware changes. The car keeps its standard turbo, exhaust, intercooler and catalyst, and stays road legal and MOT-ready. This is what most Mercedes owners have, and it is where the value is.
Stage 2
Software plus hardware
A file written around parts you have fitted, usually a downpipe with a sports cat, an intercooler or an intake. The hardware on its own does very little; the gain comes from mapping around it.
Stage 3
The build
Turbo, injectors, fuelling and often internals, calibrated from scratch on the dyno. A project rather than an appointment, and we will tell you honestly whether your engine is a sensible base for one.
How we do it
Reading and writing a Mercedes ECU
The right tool for the unit
We run Alientech, Magic Motorsport, Flashtec and bFlash. Between them they cover the Bosch and Continental ECUs used across the Mercedes range, old and current. Which tool a car needs is decided by its ECU, not its badge.
OBD or bench
Most cars are read and written through the diagnostic port with nothing removed. Some locked or later units have to come out and go on the bench. We do bench work here rather than posting your ECU away, so it is the same visit.
Proven, not assumed
Our research and development bay holds a Mustang AWD linked dyno rated to 2000bhp. Book runs with your remap and you leave with a printed before-and-after graph for your own car.
Gearbox tuning
The gearbox has its own control unit and its own torque limiter, which can clip an engine remap. We tune the 7G-Tronic and 9G-Tronic automatics: faster and firmer shifts, raised limiters, quicker response to the paddles and a manual mode that holds a gear instead of changing up on its own.
- Your original file is kept, so the car goes back to standard whenever you want
- Health check before we write anything, and a road test after
- Over 50,000 cars tuned since 2011, rated 4.8 from 2,200+ reviews
- Maidstone, Kent, with a mobile service and a trade file service for garages
Questions
Mercedes tuning, asked and answered
How much power will a Mercedes remap add?
It depends entirely on the engine, which is why we publish the figures per engine rather than a headline number. Across the 733 engines we hold, Stage 1 is typically worth around +22% on power, and as much as +150 bhp on the strongest. A modern turbo engine gains far more than a naturally aspirated one. Put your registration in and you will get the figures for your exact car.
Is remapping a Mercedes safe for the engine?
It is when the limits are respected. We work inside the tolerances the engine was designed with, check the car over before we write anything and road test it afterwards. What damages engines is chasing a number past what the hardware can take, or a generic file written for a different specification of the same car.
Will a remap affect my Mercedes warranty?
A main dealer can detect a remap and may decline an engine or drivetrain claim because of it. We keep your original file and can return the car to standard before a dealer visit, and we offer an optional engine warranty on Stage 1.
How long does it take and can it be undone?
Most cars are done in about two hours through the diagnostic port, or the same day if the ECU has to come out for a bench read. It is fully reversible: we hold your original file and can write it back.
Will it use more fuel?
Usually less on a steady motorway run, because the engine is working less hard to hold the same speed. Driven harder, it will use more. The gain in economy is real but it is not the reason to do it.
Do I need to book, and where are you?
We are in Maidstone, Kent, and we also run a mobile tuning service. Send us the registration and which stage you are interested in and we will come back with what your car needs, what it will make and a fixed price, usually the same working day.
Case studies
Case studies: Mercedess we have written up
Mercedes Sprinter Tuning and ECU RemappingA Sprinter is a working vehicle, so the reason to remap one is rarely peak power. It is how the van pulls…Read the case study →
Mercedes MD1 MG1 ECU UnlockMERCEDES-BENZ MD1/MG1 ECU UNLOCK At JF Automotive, we’re thrilled to announce that we can now remap 2021+ engines on select Mercedes-Benz models,…Read the case study →
Mercedes AMG GT 2017+MERCEDES AMG GT TUNING (2017 - Present)Through our expert upgrades and meticulous calibrations, we aim to elevate your Mercedes AMG GT to…Read the case study →
Mercedes A45, CLA45, GLA45 AMG 2018+MERCEDES A45, CLA45, GLA45 AMG TUNING (2018 - Present)The Mercedes A45 CLA45 GLA45 AMG has garnered numerous positive reviews since their releases.…Read the case study →
Mercedes A35, CLA35, GLA35 AMG 2018+MERCEDES A35, CLA35, GLA35 AMG TUNING (2018 - Present)Mercedes AMG models A35, CLA35, and GLA35 are popular choices for tuning enthusiasts due…Read the case study →
Introducing Workshop 2: Expanding Our Reach for Exceptional Vehicle ServicingWe are thrilled to announce a major milestone at JF Automotive – the opening of Workshop 2! As a testament to our…Read the case study →Fixed price
Ask about your Mercedes
Registration and which stage. We come back with what it needs, what it makes and what it costs, usually the same day.
Meet the team
The team behind every job
Technicians, calibrators and the front desk, all in Maidstone. No call centre and no subcontracting - the person who books you in is the person you can ask about the job.
Newsletter
Offers on parts and tuning, first
A short email now and then: new vehicle support, parts deals, open days. Nothing daily.