About JR Tuning
JR Tuning is the retail brand of ByteFLASH, a specialist automotive software company. We're not just another tuning shop; we're backed by the people who write the software.
JR Tuning is the retail brand of ByteFLASH, a specialist automotive software company. We're not just another tuning shop; we're backed by the people who write the software.
JR Tuning is the customer-facing retail brand of ByteFLASH, a specialist automotive software company that develops ECU and TCU tuning files, supplies technical training to the trade, and supports a nationwide network of approved installers. Most tuning companies source their files from third-party suppliers; we're part of the company that writes them.
This means every remap carried out by JR Tuning is built on the same software platform that ByteFLASH provides to installers across the UK and beyond, developed, tested and refined by a dedicated in-house engineering team.
Our workshop is located in Headcorn, Kent, approximately 15 miles from Maidstone. We provide Engine ECU and Gearbox TCU remapping directly to customers, with both in-workshop and mobile appointments available across Kent, London and the South East.
For customers further afield, ByteFLASH's network of approved installers means the same software is available nationwide, and the ByteFLASH handheld OBD programmer extends that reach worldwide.
We don't use generic off-the-shelf files. Every calibration is developed by the ByteFLASH engineering team using real vehicle data, refined through extensive testing and validated against manufacturer specifications. When you book a remap with JR Tuning, you're getting software built by specialists, not resold from a generic library.
We believe in transparency; we're happy to sit down with any customer and walk through exactly what is being changed in their vehicle's ECU and why. No smoke and mirrors, no vague promises of "up to X% more power" without evidence to back it up.
Software-led. Customer-focused. No compromises.
Every remap is backed by our lifetime software warranty and a no-quibble 14-day money back guarantee. If you're not satisfied, we'll restore your original software and refund you in full. We can offer that guarantee because we're confident in the quality of the software behind it.