Rossiters Diesel Tuning

Rossiters have over 30 years’ experience in diesel tuning. We were the first company to launch the plug-in style turbo diesel tuning system in the UK, in the mid 1990’s. Others then jumped on the bandwagon, but none have the same years of experience of this type of tuning. We are now dealers for AC Schnitzer diesel tuning for BMWs and MINIs, and for Steinbauer tuning which covers almost every modern diesel vehicle, including cars, light and heavy commercials and agricultural machinery. Both AC Schnitzer and Steinbauer offer astonishing improvements in both performance and economy, with the great backup and depth of experience you can only get at Rossiters. Call us on 01485 540000 for an honest conversation about the pros and cons of the different tuning methods available.

AC Schnitzer

AC Schnitzer is the premium diesel tuning solution for BMW and MINI. Combined with extraordinary research and development carried out at the Nürburgring and on public roads, AC Schnitzer are the only tuning company to offer a 3 year warranty on the engine and drivetrain, to run concurrently with the manufacturer’s warranty. In other words, if there is a problem with the tuned engine and the manufacturer steps aside from their warranty, AC Schnitzer can step in and cover the cost of repairs. This situation is incredibly rare, but the AC Schnitzer warranty allows you to fully enjoy your tuned engine with complete peace of mind.

A 20% increase in power is typical and, if driven sensibly, a slight reduction in fuel consumption is possible.

Prices start at around £3000 + fitting. Visit for further details. AC Schnitzer also make performance upgrades for petrol and hybrid cars.

Diesel bmw engine - Rossiters Ltd



Steinbauer diesel tuning is the cost-effective but high performance solution for all modern diesel (and some petrol) turbo engines. Unlike some of the cheaper engine tuning “boxes” available elsewhere, which simply increase fuel rail pressure to produce power gains, Steinbauer is a well-researched and developed system that integrates with your vehicle’s electronics perfectly. This level of control prevents unwanted side effects such as engine management lights, black smoke or excessive fuel consumption from over-fuelling.

As with AC Schnitzer a 20% increase in power is typical and a slight increase in MPG is possible.

Prices start from £399, please call for a quote on your specific model.

Fitting for both AC Schnitzer and Steinbauer is available from £81 inc vat.

Diesel E1479313155147 - Rossiters Ltd