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Tuning file service · since 2011Dyno developedtuning files for dealersStage 1 to 3, gearbox, deletes. Around 16 minutes. Any tool.

Upload the read from your tool, tick the options, and a file written on our own rolling road lands in your account in around 16 minutes. Stage 1 to Stage 3, gearbox, and every delete and patch. No contract, no minimum.

Open a free portal account → See file prices →

703 files last month · 833+ dealers · 24 countries

ECU JFA ~16 minutes 1 · Read 2 · Upload 3 · Portal 4 · Download 5 · Write Any slave or master tool · files written in Maidstone, UK
703Files last month
24Countries
833+Dealers
16Minutes average turnaround
What is covered

Files for every stage and every fix

Every file is written for the exact ECU and software version you read, by a tuner, not by a database lookup. If the engine is one we have not seen before, we say so and quote it rather than guess.

Performance

Stage 1 software on a standard car. Stage 2 for cars with an intercooler, exhaust or intake. Stage 3 for hybrid turbos and built engines, quoted per car.

Gearbox

DSG, DCT, ZF 8HP and other TCU files: faster shifts, higher torque limits, launch control and raised rev limits to match the engine file.

Deletes and patches

DPF, EGR, AdBlue, O2, swirl flap, start-stop, GPF/OPF, cylinder on demand, AGS, cold start, DTC, hot start fix, MAF off, Vmax, CVN fix, injector and MAP sensor scaling.

Character

Pop and bang, antilag, launch control, sports display calibration and custom requests. Some options are off-road only and the portal says which.

Stage 1Stage 2Stage 3Gearbox / DSG / TCUDPF deleteEGR deleteAdBlue deleteO2 / decatSwirl flap deleteStart / stop disablePop and bangAntilagLaunch controlDTC deleteGPF / OPF offCylinder on demand offAGS deleteCold start deleteHot start fixMAF offVmax removalCVN fixSports display calibrationInjector scalingMAP sensor scalingImmo deleteCustom requests
How it works

Read, upload, download, write

1

Open a free account

2 minutes

Register on the dealer portal. No joining fee, no contract, no minimum order.

2

Top up, pay per file

Stage 1 £50

No bundles, no monthly fee. Top up your account in your own currency and each file is deducted from the balance as you order it. The balance stays on your account until you use it.

3

Upload your read

Any tool

Read the ECU with your tool, upload the original file and tick the options you want.

4

Download and write

~16 minutes

Your tuned file lands in your account. Write it, hand the keys back, invoice the job.

Slave or master?

A slave tool reads and writes files encrypted to one file supplier: simpler, cheaper, and you get our finished file back ready to write. A master tool gives you the decrypted file to edit yourself, and our master files come with the original for comparison. Most new dealers start with a slave tool and never need more.

Boost target · mbar load ↑   rpm → 10017701825188019351990204521002155221022652225218521452105881660171517701825188019351990204521002155211520752035199576155016051660171517701825188019351990204520051965192518856414401495155016051660171517701825188019351895185518151775521330138514401495155016051660171517701825178517451705166540122012751330138514401495155016051660171516751635159515552811101165122012751330138514401495155016051565152514851445161000105511101165122012751330138514401495145514151375133510001500200025003000350040004500500055006000650070007500 Recalibrated by the tuner Factory value, untouched
What a tuning file is

One file, a few hundred cells changed

Your engine control unit runs on maps: tables of fuel, boost and ignition timing for every engine speed and load. A tuning file is that software with the right cells recalibrated, checksum corrected, ready to write back.

Every JFA base file starts on our own rolling road, then is matched to the exact ECU and software version you read. Not a generic file from a database.

Why JFA files

Written on a dyno, backed by people

  • Every base file developed on our own AWD rolling road in Maidstone, with the comparison sheets to prove it
  • A tuner writes your file, checks it against our database of that ECU, and takes responsibility for it
  • Live chat and a help centre while the car is on the ramp, so you are never stuck with a customer waiting
  • Revisions free, and the file credited back to your account if we cannot tune the car
  • Pay per file and no monthly fee, so a quiet month costs you nothing
  • Fifteen years of files, 22+ years in the automotive trade, and a workshop that tunes cars every day
20003000400050006000 500 bhp rpm 420 bhp · 500 Nm was 320 bhp · 420 Nm Stage 1 power Stage 1 torque Standard VW Golf R 2.0 TSI · JFA rolling road

VW Golf R 2.0 TSI, standard against Stage 1, from our database. Ask for the sheet on any engine you quote.

Tools

Works with every tuning tool

Slave or master, OBD, bench or boot. Upload the read and we write for the tool that made it. Do not have a tool yet? We sell, train on and support Autotuner, KESS3, Flex and CMD.

Autotuner tool

Autotuner

The tool we recommend to most new dealers: one payment, wide coverage, and no renewal to remember.

£2,650£2,100ex VAT, next-day delivery
Autotuner →
MagicMotorsport Flex case

MagicMotorsport Flex

Our choice for dealers who want the widest coverage and plan to add bench and boot work.

from £1,600ex VAT, slave
Flex →
Flashtec CMD tool

Flashtec CMD

For established dealers who do a lot of bench work and want the diagnostic suite in the same box.

from £3,105ex VAT, slave
CMD →
Alientech KESS3

Alientech KESS3

For dealers who tune more than cars: the coverage across bikes, marine, agricultural and trucks is unmatched.

from £1,700ex VAT, slave
KESS3 →
GYSFLASH 100.12

GYS GYSFLASH 100.12

Every dealer, every write. It is the cheapest insurance in the workshop.

from £814.98ex VAT
GYS 100A →
Research and development

Cars we developed files on this year

The engines below were mapped on the dyno at JFA and the files are in the portal. Ask for the before and after sheets.

VW Transporter Tuning and ECU RemappingThe Transporter splits neatly into two conversations: everything up to the T6.1, which is…
Mercedes Sprinter Tuning and ECU RemappingA Sprinter is a working vehicle, so the reason to remap one is rarely peak power. It is ho…
Audi S3, S4 and S5 Tuning and ECU RemappingWith the S models, the badge on the back tells you much less than the engine under the bon…
Ford Focus Tuning and ECU RemappingThe Focus is one of the most common cars we see, and one where the headline number is the…
Free for dealers

A vehicle search tool for your own website

Dealers get our registration lookup and tuning figures to embed on their own site, so your customers can see what their car will make before they call you. Ask the team when you register.

Dealers on the service

What dealers say

★★★★★

“I started using JFA around a year ago with a MK7 Golf GTI. Since then I have tuned over 150 vehicles using their service and my remap turnover is up by 40 percent over the previous year. Ask to see the dyno comparisons.”

Luke Oliver, Hy-Torque · Google
★★★★★

“Fast service, customer-waiting jobs are no problem, and the support from the staff is second to none.”

Jamie White, JRW Elite Automotive · Google
Dealer enquiry

Ask us anything about files, tools or joining

A real person from the tuning team replies, usually the same working day. No sales script.

We use your details to answer this enquiry. See our privacy policy.

Dealer portal

Register on the dealer portal. No joining fee, no contract, no minimum order.

Open a free portal account →

01622 321500
  • Live chat and a help centre while the car is on the ramp, so you are never stuck with a customer waiting
  • Revisions free, and the file credited back to your account if we cannot tune the car
  • Pay per file and no monthly fee, so a quiet month costs you nothing
John Ford, JF Automotive
Speak to John Message me on WhatsApp. I read these myself. WhatsApp us
Questions

File service questions

What do I need to start?

A tuning tool that can read the ECU (any brand) and a free portal account. Read the car, upload the file, tick the options and download; the file is deducted from your account balance.

How much does a file cost?

A Stage 1 is £50, a Stage 2 £80, and options such as DPF or AdBlue are added on top. You top up your account in your own currency and each file is deducted from the balance. See the file prices page for the full list and a calculator.

What are your opening hours for files?

If the file is already in our database, our system matches it and sends it straight back to your account, 24/7, weekends included. New files are written by hand Monday to Friday 8am to 5pm and Saturday 8am to 1pm, UK time. Our average turnaround last month was 16 minutes. Tell us on live chat if a customer is waiting.

Can I get the original file back?

Yes. Every request keeps the original read alongside the tuned file in your account, so a car can always go back to standard.

Do you write for vans, trucks and motorhomes?

Yes. Light commercials and motorhomes are a large part of the service, and we cover most Sprinter, Transit, Crafter and Ducato engines. Ask about heavy trucks and agricultural.

Are deletes legal?

Some deletes make a vehicle illegal for road use in the UK and in most of Europe, and the portal marks which. They are supplied for off-road and motorsport use and the dealer is responsible for how a file is used.

Next

Related

File prices

A Stage 1 is £50, a Stage 2 £80, a gearbox file from £50, and each option has a fixed price on top. Top up your account in your own currency and each file is deducted from the balance as you order it. No bundles, no monthly fee.

See file prices →

Tuning tools

Autotuner, Alientech KESS3, MagicMotorsport Flex, Flashtec CMD and the GYS battery stabiliser, with free training and a year of subscription where the tool has one.

See tuning tools →

Become a dealer

Live chat and a help centre while the car is on the ramp, a free vehicle search tool for your website, marketing help, and discounted tuning on your own cars.

Become a dealer →

WinOLS / EVC

Master files, EVC credits and how we work with tuners who edit their own maps.

Read more →
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The JF Automotive team
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.

Meet the team →
Newsletter

Offers on parts and tuning, first

A short email now and then: new vehicle support, parts deals, open days. Nothing daily.