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Home › Case studies

Tuning case studies

We have tuned more than 50,000 cars since 2011. These 110 are the ones we photographed, measured and wrote up properly: what the car made standard, what we changed, and what it made afterwards on our own rolling road. Your car does not need to be on this list – we hold data for thousands more.

50,000+Cars tuned since 2011
110Written up here
23Makes
2000bhpMustang AWD dyno

110 case studies

Bugatti

Bugatti Veyron Tuning: Oakley Design

Oakley Design brought us their carbon-bodied Bugatti Veyron EB 16.4 to map. Strapped to our Mustang AWD 2000bhp dyno it made 987bhp…

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Audi

EV Servicing, Repairs and Tuning

We service, MOT, diagnose and modify electric cars, and on the Porsche Taycan and Audi e-tron GT we can recalibrate the drive…

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Volkswagen

VW Transporter Tuning and ECU Remapping

A Stage 1 remap takes the T6 and T6.1 Transporter's 150bhp 2.0 TDI to around 190bhp and 420Nm, and the 204bhp twin…

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Ford

Ford Focus Tuning and ECU Remapping

The Focus is one of the most common cars through our workshop, and one where the headline power figure is the most…

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Mercedes

Mercedes Sprinter Tuning and ECU Remapping

A Stage 1 remap takes the W906 Mercedes Sprinter 316 CDI from 163bhp and 360Nm to around 210bhp and 460Nm, and the…

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Audi

Audi S3, S4 and S5 Tuning and ECU Remapping

With the S cars, the badge on the back tells you far less than the engine underneath it. An S4 might be…

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BMW

BMW Plug-In Hybrid Tuning: 330e, 530e, 545e, X5 45e and i8

The complaint we hear about plug-in hybrid BMWs is always the same, and it is not that they are bad cars. On…

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McLaren

MCLAREN 720S TUNING

A Stage 1 remap takes the McLaren 720S from 720bhp and 770Nm to around 820bhp and 880Nm on our rolling road, with…

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Porsche

PORSCHE 911 GT3 EXHAUST & TUNING

The 991 GT3 leaves the factory with 475hp and 440Nm in 3.8 form (991.1) and 500hp and 460Nm as the 4.0 (991.2).…

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Tesla

TESLA MODEL 3 Highland LOWERING SPRINGS

The Model 3 Highland sits high as standard, so on our own 2025 fleet car we fitted Unplugged Performance moderate lowering springs…

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Mercedes

MERCEDES-BENZ MD1/MG1 ECU UNLOCK

MD1 and MG1 are Bosch's current ECU generation, MD1 on diesel and MG1 on petrol, and they are locked far harder than…

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Ford

Ford Transit Custom & Ranger Tuning (2019-2026)

A Stage 1 remap takes the Ford Transit Custom 2.0 EcoBlue to around 190bhp and 480Nm whether it started at 105, 130…

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Mercedes

MERCEDES AMG GT TUNING

A Stage 1 remap takes the 462hp Mercedes AMG GT to around 560bhp and 800Nm on our rolling road, and the 510hp…

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Toyota

TOYOTA YARIS GR TUNING

Toyota claims 0 to 62mph in 5.5 seconds for the 261PS GR Yaris (2020 to 2023), and 5.2 seconds for the 2024…

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BMW

BMW M5 TUNING

The F90 M5 makes 600hp and 750Nm as standard, or 625hp in Competition form, from the 4.4 litre twin-turbo S63 V8. Our…

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Mercedes

MERCEDES A45, CLA45, GLA45 AMG TUNING

Stage 1 on a 381PS A45 (W176, 2015 to 2018) is worth around 420PS and 550Nm on our rolling road. The later…

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Mercedes

MERCEDES A35, CLA35, GLA35 AMG TUNING

A Stage 1 remap takes the Mercedes-AMG A35 from 306hp and 400Nm to around 330hp and 490Nm on our rolling road. The…

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BMW

BMW M135i & M235i TUNING

A Stage 1 remap takes an F20 LCI M135i from 326PS and 450Nm to around 390PS and 525Nm on our rolling road,…

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BMW

BMW M140i, M240i TUNING

A Stage 1 remap takes the BMW M140i and M240i from 340bhp and 500Nm to around 420bhp and 640Nm on standard hardware.…

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Audi

AUDI RS6 & RS7 TUNING

The C7 RS6 and RS7 share the 4.0 TFSI twin-turbo V8 at 560hp and 700Nm, or 605hp and 750Nm in Performance form.…

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Audi

DSG / S-TRONIC GEARBOX TUNING

DSG and S-tronic are the same thing, a dual-clutch automatic, and both have a separate gearbox control unit with its own software.…

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BMW

BMW GXX Series M3 & M4 Tuning

A Stage 1 remap takes a G80 M3 from 480PS and 600Nm to around 600PS and 700Nm on our rolling road, and…

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Audi

AUDI R8 V10 TUNING

A Stage 1 remap takes the 540hp Audi R8 V10 to around 630bhp on our rolling road, and the 570hp and 610hp…

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Audi

AUDI RS6 & RS7 TUNING

The C8 RS6 and RS7 make 600hp and 800Nm from the 4.0 TFSI twin-turbo V8 with mild hybrid assistance. Our Stage 1…

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Audi

AUDI RS4 / RS5 TUNING VAG 2.9T

A Stage 1 remap takes the B9 Audi RS4 and RS5 from 450bhp and 600Nm to around 520bhp and 750Nm on our…

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Audi

Audi RS3 8V Tuning (2015-2017)

The 2015 to 2017 RS3 8V makes 367hp and 465Nm from its five-cylinder 2.5 TFSI. Our Stage 1 calibration takes it to…

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Audi

Audi RS3 (8Y: 2020-)

A Stage 1 remap takes the 8Y Audi RS3 from 400bhp and 480Nm to around 470bhp and 620Nm on standard hardware. The…

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Audi

Audi RS3 8V Tuning (2017 On)

A Stage 1 remap takes the 400hp Audi RS3 8V to around 470bhp and 620Nm on our rolling road, and the earlier…

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Land Rover

Boost your Land Rover Hybrid Performance with our Stage 1 Tune

The 3.0 litre Ingenium mild hybrid diesel in the current Defender and Range Rover can be remapped through the OBD port. On…

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Prepare Your Car For Winter

Stay safe on icy roads with our guide!

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Lamborghini

Lamborghini Urus QuickSilver Exhaust

The factory Urus exhaust closes its valves on throttle lift to satisfy noise regulations, which muffles the 4.0 twin-turbo V8. The Quicksilver…

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Toyota

The Yaris GR – Stage Tuning

A Stage 1 remap takes the GR Yaris from 261PS and 360Nm to around 305PS and 400Nm on our rolling road, with…

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Abarth

Introducing Workshop 2: Expanding Our Reach for Exceptional Vehicle Servicing

We are thrilled to announce a major milestone at JF Automotive - the opening of Workshop 2! As a testament to our…

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McLaren

Unleashing the Power: JF Automotive’s Expert McLaren Car Servicing and Tuning

We are an independent McLaren specialist in Maidstone, Kent. We service, repair, MOT and tune them, working to the manufacturer schedule so…

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Volkswagen

Golf MK8 R, Clubsport & GTI Tuning

The Mk8 Golf R makes 320PS and 420Nm from the factory. Our Stage 1 remap takes it to around 420bhp and 500Nm…

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AdBlue Faults: Warning Lights, Errors and Repairs

An AdBlue warning usually means the SCR system has failed a self-test, not that the tank is empty. NOx sensors, the dosing…

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Siemens SIMOS 19.6 & 19.3 Now Supported

Simos 19.3 and 19.6 are Continental's latest petrol ECUs in the VAG range, and they are the units that stopped a lot…

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The Hidden Truths Behind The Tuning Industry!

ECU Remapping - High BHP figures quoted to sell maps!

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ECU Remapping – Unlocking Your Car’s True Potential

Remapping rewrites the software your engine's ECU runs on. The engine is the same; the instructions it follows are not. Manufacturers leave…

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Alfa Romeo

Alfa Romeo Giulia Quadrifoglio Tuning

A Stage 1 remap takes the 510bhp Giulia Quadrifoglio to around 560bhp and 720Nm on our rolling road for the 2016 to…

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ADAPTIVE TUNING MODULE

A Speed-Buster is a plug-in module that sits between the engine's sensors and the ECU and alters the signals, usually fuel pressure…

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Autowatch Ghost Immobiliser

Don't Leave Your Car Without It!

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McLaren

McLaren 570s Tuning

A Stage 1 remap takes the McLaren 570S from 570bhp and 600Nm to around 620bhp and 680Nm on our rolling road, with…

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Abarth

2021 Abarth Tuning – A Worlds First!

Abarths built from 2021 onwards have a factory-locked ECU that blocks the usual OBD remap, and for a while the industry treated…

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Audi

Audi RS6/7 C8 Tuning

A Stage 1 remap takes the C8 Audi RS6 and RS7 from 600bhp and 800Nm to around 700bhp and 950Nm on our…

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Power Maxed Racing Partnership!

JF Automotive Form Partnership with Power Maxed Racing

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Partnership with Praga Racing Drivers Chris and Ed Bridle

JF Automotive announce partnership with Praga Racing Drivers Chris and Ed Bridle

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Toyota

Yaris GR Tuning Package

Yaris GR Engine Tuning First off with our adaptive tuning module that uses multi-channels to take the mighty Yaris GR to 301BHP…

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What’s so special about the Eventuri Intakes?

Most aftermarket intakes bolt a cone filter straight onto the inlet tube, so the air has to squeeze from the wide filter…

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Toyota

Tuning The GR Yaris – What we have in store

Tuning the most anticipated car in the automotive industry.

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Tesla

Our Latest Development Car – Tesla Model 3

Our Tesla Model 3 Performance development car shows what we offer for the Model 3 without touching the drivetrain: H&R lowering springs…

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Toyota

The A90 Supra – Tuning The Iconic JDM’s Successor

The A90 Supra arrived carrying the weight of the Mk4's reputation, and the first question everybody asks is whether it lives up…

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Audi

Audi SQ5 3.0TFSI Tuning

The petrol SQ5 makes 354hp and 500Nm from its 3.0 TFSI V6, the same single-turbo engine used in the S4 and S5.…

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Audi

Audi RS3 Tuning

The RS3 is the car that made the five cylinder respectable again, and the 2.5 TFSI responds to tuning as well as…

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Audi

Audi R8 V10 Supercharger Kit Tuning

The naturally aspirated 5.2 FSI V10 in the R8 leaves little on the table for a software-only tune: the catalogue Stage 1…

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BMW

BMW M5 F90 Tuning

A Stage 1 remap takes the F90 BMW M5 from 600bhp and 750Nm to around 710bhp and 1,050Nm on our rolling road.…

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Bentley

Bentley Continental GT Tuning

The Continental GT Supersports makes 630hp and 800Nm from its 6.0 litre twin-turbo W12. Our Stage 1 calibration takes it to around…

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Alfa Romeo

Alfa Romeo Stelvio N-Ring Edition

A Stage 1 remap takes the Stelvio Quadrifoglio from 510bhp and 600Nm to around 560bhp and 700Nm on our rolling road. The…

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Volkswagen

Golf R Big Brake Kit Install

The standard Golf R brakes are fine for a standard Golf R. Add 60 or 70PS and use the car on track…

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BMW

BMW 335D Tuning

A Stage 1 remap takes the F30 335d xDrive from 313PS and 630Nm to around 365PS and 710Nm on our rolling road.…

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Audi

Audi RS6/RS7 C7 Engine Tuning

Audi RS6/RS7 C7 Engine ECU Remapping And Tuning

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Kia

Poor Throttle Response? We Can Fix That – Kia Sedona 2.9 CRDi

Whether you're trying to join a small gap at a roundabout or merging on to the main road at a junction, poor…

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Vauxhall

The Infamous Corsa VXR Injectors: Why Do We Change Them?

The Corsa VXR's 1.6 turbo runs port injectors that age badly, and a leaking or lazy one shows up as a rough…

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Mercedes

Mercedes GLS 63 AMG Tuning

A Stage 1 remap takes the 585hp GLS 63 AMG to around 660bhp and 1,100Nm on our rolling road, and the later…

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Audi

Audi TT 1.8 TFSI Tuning

The 8S Audi TT 1.8 TFSI makes 180hp and 250Nm as standard. Our Stage 1 calibration takes it to around 220hp and…

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Milltek Exhaust Guide: Everything You’ll Need To Know Before Buying Milltek

The two choices that decide what a Milltek system sounds like are whether it is resonated and which tip you pick. A…

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BMW

BMW 650i Tuning

The F12 and F13 650i with the Valvetronic N63 make 449hp and 650Nm as standard. Our Stage 1 calibration takes the 4.4…

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What to do on the day

First time having a car tuned? Not sure where to go, or what to do when you get to us - here's…

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Audi

Budget builds – VAG 2.0TFSI

The BWA is the 200PS 2.0 TFSI that Volkswagen launched around 2005, best known from the Mk5 Golf GTI and Mk2 Leon…

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Audi

Audi RS4 B9 Engine Tuning

Audi RS4 B9 Engine ECU Remapping & Tuning

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Abarth

Tuning the ‘Untuneable’ Abarth 124

The Abarth 124 Spider uses Fiat's 1.4 litre MultiAir turbo making 170hp, not the naturally aspirated Mazda engine from the MX-5 it…

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Abarth

JFA260 Conversion Kit – Big power for the little Abarth

The JFA260 is our own Stage 3 turbo conversion for the Abarth 500, 595 and 695. It takes a standard 135bhp car…

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EVC WinOLS Tuning File Reseller Database

WinOLS is the software almost every professional file writer uses to open and modify an ECU map, and the EVC database is…

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Preparing for your visit to JFA

There's nothing worse than having to turn away a customer due to their car being unsafe, or not in a fit condition…

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Abarth

Abarth Actuator Upgrades – Why You Probably Don’t Need One

An adjustable wastegate actuator only makes an Abarth faster if it is set up wrongly. Fitted correctly it holds the same boost…

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Fuel Additives – Do they actually work?

An octane booster raises the knock resistance of the fuel in your tank, which is not the same as adding power. On…

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Induction kits – a worthwhile mod?

Extensive testing of an induction kit, showing the benefits and improvements in performance that can be had even without mapping alterations.

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BMW

JFA Performance & Sound Kit – 440i, 340i, 140i

The BMW M Performance Power and Sound Kit, or MPPSK, pairs a plug-in power module with an M Performance exhaust and a…

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BMW

BMW 114i ECU Remapping – A Factory Restricted Vehicle

The BMW 114i is the entry-level F20 1 Series, and its 102hp comes from a 1.6 litre turbocharged N13 that BMW also…

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BMW

GTS Software Upgrades – F8X M2/M3/M4

When BMW built the M4 GTS they did rather more than turn the boost up. The car reviewers raved about was the…

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Touch Tune – Multiple Maps & Remote Home Tuning

What is it, why do you need it, and what can it do for your car?

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OBD Remapping with Alientech’s KESS – How it works

KESS is Alientech's tool for reading and writing engine ECUs, and the current KESS 3 does OBD, bench and boot work in…

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Bench Tuning with Alientechs KTAG – How it works

Bench tuning means taking the ECU off the car, opening it and communicating with it directly on the bench rather than through…

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Chiptuning / Chipping – Do I need it?

Chip tuning originally meant exactly that: removing the memory chip from the ECU and soldering in a replacement holding a different map.…

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Calculating Horsepower

Power is not measured directly. A dyno measures torque and engine speed, and power is calculated from the two: multiply torque by…

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BMW

BMW GEARBOX TUNING

XHP Flashtool rewrites the BMW ZF automatic's transmission control unit rather than the engine ECU. It shortens shift times, raises the gearbox…

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Water Methanol Injection – What & Why?

Water methanol injection sprays a fine mist of water and alcohol into the engine's intake. It drops intake charge temperature sharply and…

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McLaren

McLaren 675LT Engine Tuning

The McLaren 675LT makes 675hp and 700Nm from its 3.8 litre twin-turbo V8. Our Stage 1 calibration takes it to around 730hp…

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Mercedes

Mercedes E63/S Tuning

A Stage 1 remap takes the W213 Mercedes-AMG E63 S from 612bhp and 850Nm to around 700bhp and 1,050Nm, and the 571bhp…

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Jaguar

Jaguar F-Type 3.0S Tuning Packages

A Stage 1 remap takes the 340hp supercharged V6 F-Type to around 400hp and 500Nm on our rolling road, which is the…

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Volkswagen

Golf R Tuning and ECU Remapping

A Stage 1 remap takes a Mk7 Golf R from 300PS and 380Nm to about 365PS and 500Nm; the 310PS Mk7.5 reaches…

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BMW

BMW M3 / M4 ECU Remapping

A Stage 1 remap takes the F82 BMW M4 from 431bhp and 550Nm to around 510bhp and 720Nm, and the 450bhp Competition…

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Audi

Audi RS3 2.5 TFSI ECU Remap

How we tuned the Audi RS3 2.5 TFSI

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Fiat

Fiat 500 Abarth Engine ECU Remapping

Every 1.4 T-Jet Abarth uses the same engine, and the badge on the back tells you which software Fiat put on it…

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BMW

BMW 340i ECU Remapping

The BMW 340i has the B58B30: a 3.0 litre twin-scroll turbocharged straight-six making 326PS (322bhp) and 450Nm as standard. It arrived with…

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Volkswagen

VW Golf MK7 GTi ECU Remapping Packages

A Stage 1 remap takes the Mk7 Golf GTI from 220bhp and 350Nm to around 300bhp and 450Nm on standard hardware. The…

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Porsche

Porsche 991 911 Turbo

The 991 911 Turbo makes 520hp and 660Nm as a 991.1 and 540hp and 660Nm as a 991.2, from the 3.8 litre…

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Abarth

Abarth ECU Remapping

We have owned and developed our own Abarths and remap every 1.4 T-Jet from the 135hp 500 to the 190hp 695, including…

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Alfa Romeo

Alfa Romeo ECU Remapping

We remap the Alfa Romeo range at our workshop in Maidstone. The 2.9 twin-turbo V6 in the Giulia and Stelvio Quadrifoglio goes…

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Aston Martin

Aston Martin ECU Remapping

We remap the full Aston Martin range, from the 4.3 and 4.7 V8 Vantage and the 5.9 V12 DB9 and DBS to…

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Bentley

Bentley ECU Remapping

We remap Bentleys at our own workshop in Maidstone: the W12 and V8 Continental GT, the Flying Spur and the Bentayga. These…

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Ferrari

Ferrari ECU Remapping

A Stage 1 remap takes the Ferrari 488 GTB and Spider from 670bhp and 760Nm to around 720bhp and 850Nm, and the…

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Ford

Ford ECU Remapping

We remap the whole Ford range, from the Fiesta and Focus ST and RS through to the Transit and Ranger. The EcoBoost…

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Jaguar

Jaguar ECU Remapping

A Stage 1 remap on the 180hp 2.0 diesel F-Pace takes it to around 210hp and 490Nm, and the 150hp E-Pace D150…

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Lamborghini

Lamborghini ECU Remapping

A Stage 1 remap takes the Huracan LP580-2 from 580bhp to around 630bhp, and the LP610-4 from 610 to about 630bhp, so…

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Land Rover

Land Rover ECU Remapping

Land Rovers and Range Rovers are heavy, and that is rather the point of tuning one. Peak power matters less than whether…

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McLaren

McLaren ECU Remapping & Engine Tuning

A Stage 1 remap takes the McLaren 540C from 540bhp and 540Nm to around 620bhp and 680Nm, and every 570 variant, the…

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Seat

Seat ECU Remapping

Seat and Cupra sit on the same VAG engines as Volkswagen, Audi and Skoda, which is good news, because these are engines…

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Skoda

Skoda ECU Remapping

Skoda uses the same VAG engines as Volkswagen, Audi and Seat, so the Octavia vRS, Superb and Kodiaq respond much as their…

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BMW

BMW S1000RR 2010 ENGINE TUNING

This 2011 S1000RR came to us for more mid-range, and a diagnostics scan first found a disconnected exhaust valve and a camshaft…

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