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Specialist ECU, TCU & Performance Tuning

Professional in-house tuning, servicing and diagnostics from our Horsham workshop using Autotuner and Alientech KESS3 for safe, reliable results.

  • ECU unlocks for selected 2022+ BMW, VW Group & Mercedes
  • TCU mapping for DSG, ZF and other autoboxes
  • Stage 1 / Stage 2 tuning and bespoke packages
  • DPF / EGR / AdBlue solutions where applicable
  • Vehicle servicing, DSG servicing & performance upgrades
  • OBD flash on-site • Bench ECU mapping available
Professional Workshop ECU & TCU Specialists Advanced Diagnostics
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Specialist Workshop Services | RPM Sussex
Specialist Workshop Services

Built around performance, diagnostics, and specialist workshop support

From ECU & TCU remapping to advanced diagnostics and Stage 2 performance upgrades, RPM Sussex offers workshop-based services tailored to BMW and VW Group vehicles.

ECU and TCU remapping equipment at RPM Sussex

ECU & TCU Remapping

Workshop-based engine and gearbox tuning for selected BMW and VW Group vehicles, including OBD and bench mapping where required.

Stage 1 from £240 OBD & Bench DSG / TCU Support BMW & VW Group
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Vehicle diagnostics and software investigation service

Diagnostics & Software Solutions

Fault diagnosis, coding, software investigation, and specialist support for warning lights, drivability issues, and platform-specific vehicle problems.

Fault Finding Coding Software Investigation Workshop Support
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Stage 2 performance upgrades and tuning at RPM Sussex

Performance Upgrades

Stage 2 package routes combining the right supporting hardware with a matching ECU calibration, tailored to your vehicle, current mods, and goals.

Stage 2 Packages Hardware + Software BMW & VW Group 0% Payment Assist
Stage 2 Parts

Service Overview

From OBD and bench ECU remapping to diesel ECU solutions, performance upgrades and servicing — planned, installed and supported in-house.

BMW & VAG Specialists OBD & Bench Mapping 0% Instalments Transparent Pricing

ECU & TCU Remapping

Eco / Blend (Popular) / Performance calibrations written via OBD or bench (ECU out) as required — smooth, dependable gains tailored to your goal.

  • OBD & bench capability in-house
  • Pre-tune health check & backup
  • Stage 1 from £240
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Delete & Solutions

EGR / AdBlue / DPF ECU solutions to resolve persistent faults and limp-mode strategies. Supplied strictly for off-road/motorsport use.

  • OBD where supported; bench if required
  • Stop constant regens & warning lights
  • From £260 per system
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Performance Upgrades

Supply & fit — intercoolers, intakes, turbo inlets, downpipes and exhausts — matched to your map for reliable, repeatable performance.

  • Neat fitment & correct torque specs
  • Transparent parts & labour quotes
  • Book for a quote
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Car & DSG Servicing

Quality oils and filters, DSG gearbox servicing, fault scans and pre-tune checks to keep your car healthy before and after calibration.

  • Health check & diagnostics
  • DSG servicing available
  • Book online
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Choose Your Service
Select the service you’re interested in, whether that’s Stage 1 remapping, Stage 2, exhaust upgrades, servicing, diagnostics, or one of our specialist ECU solutions.

Add Your Vehicle & Contact Details
Enter your registration number, contact details, and a few notes about what you’d like done. The more detail you include, the easier it is for us to point you in the right direction and give accurate advice.

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Once we’ve reviewed your enquiry, we’ll get back to you with the best route for your vehicle, along with pricing or the next steps.

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Flexible Payment Plans

Manage your costs effortlessly with Payment Assist. Enjoy the ease of splitting payments into 3 equal monthly installments with zero interest.

  • ✔ No hidden fees
  • ✔ Quick & easy approval
  • ✔ Hassle-free payment process

Example Payment Plans

£240 3 x £80
£480 3 x £160
£900 3 x £300

Interested? Let us know and explore your finance options today!

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BMW 420i in for upgraded charge pipes. The original charge pipes are plastic, which can become a weak point under load and heat, especially once the car is tuned or driven hard. These upgraded aluminium charge pipes are much stronger and help reduce the risk of cracking, splitting, or boost leaks. The new pipes were fitted with fresh O-rings and seated correctly to ensure a secure fitment and proper seal. A very nice overall setup and a worthwhile upgrade for reliability and performance.BMW M4 Competition in for a Ridgeline Motorsport Ring Spec GT4 rear wing. This one involved a fair bit of measuring and prep before any drilling. We carefully marked out the boot lid to make sure the wing sat in the correct position, then measured everything properly to get the drill holes lined up as accurately as possible. Once marked, we drilled through the boot lid and removed the inner boot trim to gain access from underneath. This allowed us to run the bolts through properly and tighten everything down securely. We also sealed around the bolt holes with silicone to help keep everything watertight. Once fitted, the wing felt solid with no flex in the mounts and sat securely on the car. While it was with us, we also remounted the number plates as they were starting to peel off, and re-seated the rear Competition badge as the spacing needed adjusting. Really happy with how this turned out — it completely changes the rear end and gives the car a much more aggressive track-focused look.Full service carried out on this Golf GTD. This included fresh oil, oil filter and air filter, along with a full vehicle inspection and general health check. We also completed an overview report with our findings, giving the customer a clear picture of the car’s current condition and anything worth keeping an eye on.BMW 320d in for a back box delete, upgraded rear diffuser, and quad carbon-finish exhaust tips. We started by marking and cutting the OEM exhaust to remove the original back box, then sleeved the new pipework into place. It was definitely a bit of a mission getting everything lined up properly, especially as the system was originally designed for one exit each side. We made it work with two tips each side, converting the rear end into a proper quad-exit setup while still using the OEM hangers. Really happy with how this one turned out — looks aggressive, sits nicely, and gives the rear end a much better finish.Full ZAERO body kit fitted to this Golf GTI and it’s completely changed the look of the car. We fitted the full kit, including the front splitter, side skirts, rear diffuser and rear spoiler. Everything went on really nicely and the fitment was spot on, giving the car a much more aggressive and finished look without going over the top. Subtle but sharp, and it suits the GTI perfectly. A proper transformation from every angle. If you’re looking to upgrade the look of your car with quality styling parts fitted properly, get in touch with RPM Sussex.BMW in with us for a TCU tune, interim service and full service checks We had planned to carry out the Stage 1 as well, but unfortunately this one is fitted with a locked ECU. BMW started locking a lot of these post-June 2020, so this one will need an Autotuner mail-in unlock before software tuning can be completed. We still carried out the TCU tune, which sharpens up the gearbox response, improves shift speed and makes the car feel more direct to drive. Alongside that, we completed an interim service, carried out service checks, and updated the iDrive so everything is fully up to date. If your BMW is post-2020 and you’re unsure whether it can be tuned, get in touch with your reg and we can check it for you.