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A Volkswagen Golf being tuned on a customer's driveway, bonnet up, laptop connected

Premium mobile ECU tuning · Northern Ireland

Properly calibrated.
Proven safe.
On your driveway.

We come to you anywhere in Northern Ireland. Every car gets a health check, a data log before and after, and a written report, so you can see exactly what your engine is doing. Proof, not just our word for it.

Check your car See a real report
  • Health check
  • Logged before & after
  • Full written report

Mobile, all of Northern Ireland

We come to you

Tuned on your driveway or at your work, anywhere in Northern Ireland. No dropping the car at a unit and no day off work, and you deal with the person who does the work from start to finish.

A Ford Transit Custom tuned at the customer's premises

The process

How every car is tuned

  1. 01

    Health check

    Before anything changes, we scan the car for faults and log it exactly as it is. If something isn't right, you hear it from us first.

  2. 02

    A calibration written for your car

    Not a percentage added to a generic file. Every map is shaped by hand: a nice smooth boost map, not a square % change added to the corner.

  3. 03

    Logged and refined on the road

    We drive it, log it and refine it until the ECU and the engine agree. The log always gets the last word.

  4. 04

    Your written report

    Emailed to you: what your engine was doing before, what it's doing now, and the measured power and torque curves from your own car.

3D view of one of our boost maps: a smooth, even surface3D view of one of our torque to injection quantity maps
From our own calibrations: smooth maps shaped across the whole rev range.

What you get

Proof, not "trust me"

Every tune comes with an ECU tuning report built from your car's own data: airflow, boost, fuelling, exhaust temperature and the measured curves, stock against tuned. Here's a real one, with the owner's details removed.

Page from a real BOSS ECU tuning report: your car and your tune
Your car and your tune
Page from a real BOSS ECU tuning report: stock against tuned, from the logs
Stock against tuned, from the logs
Page from a real BOSS ECU tuning report: measured power and torque
Measured power and torque

Drivability and longevity

Calibrated for how your car drives

Big numbers are the easy part to shout about. We calibrate for smooth, usable power right through the rev range, built to stay safe on stock hardware, so the car feels the way it should have left the factory and keeps feeling that way for years.

"We're not the cheapest and we're not trying to be. A cheap remap is a file flashed in five minutes with no checks and no proof. We do it properly, document it, and prove it's safe. That's what you're paying for, and that's why it lasts."

Recent cars

Cars and vans, petrol and diesel

Reviews

What our customers say

100% recommend · all our reviews on Facebook →

  • Cannot recommend Darren enough.

    Was told to go to him by a work colleague as he has worked with him in the past and I can't fault a thing. Logged the car first to see how it was, gave me advice from there that helped the car run better, whilst the issues couldn't be felt they were there as once the old parts were removed you could see the damage. Then proceeded to remap the car and it has never ran better. Car feels so much more alive! Overall a fantastic experience through and through and will be my first call from now on for every car I own

    Adam M. · Facebook review, October 2026

  • Highly recommend Darren at Boss ECU Calibrations. For almost a year my Mercedes E350 had an intermittent limp mode that multiple garages couldn't solve, with some just guessing at the issue.

    Darren stepped in and diagnosed the root cause in less than 30 minutes. He found the issue mapped the car properly and took it for some test runs.

    A month later and the car is still driving flawlessly, noticeably better on fuel and incredibly smooth. He completely restored it to its best performance! with a bit of extra power ofcourse 🔥

    Daniel K. · Mercedes E350 · Facebook review, October 2026

  • Just had my Skoda Superb remapped by Boss Performance and I'm really impressed with the results. The car feels so much smoother to drive, the gear changes are a lot cleaner, and there's definitely more power when you put your foot down.

    What surprised me most is that I'm also getting better miles per gallon, so it's not just quicker, it's more economical too. The car now pulls better through the gears and feels much more responsive whether you're driving around town or on the motorway.

    Overall, it's completely transformed the way the car drives. Brilliant service from Boss Performance and I'm absolutely delighted with the remap. Highly recommended. Thanks Darren.

    Lee H. · Skoda Superb · Facebook review, June 2026

What could we do for your car?

Pop in your reg and tell us what you're after. We'll come back to you with what we'd do for your car, and we're always happy to answer any questions.

Check your car

We come to you!