JMR Motorsport is a specialist in preparing and tuning engines for competition, with a broader focus on engine electronics and performance components. Based in Cornellà del Terri, Spain, the company offers services that include engine preparation, engine testing, rolling-road testing, engine tuning, electrical installations, gearbox and differential work, and CNC machining. It also provides turnkey engines and supports customers with testing and setup services.

Its product range covers engine management and data systems, including Marelli ECU kits, engine control units, dataloggers, CAN readers and converters, and electronic accessories. Other products include gear-shift displays, warning lights, ignition coils, injectors, fuel pumps and pressure regulators, alternators and regulators, and sensors for pressure, temperature, speed, position, acceleration, and rotation. JMR Motorsport also supplies load cells, lap-timing instruments, and related measurement equipment. The site lists performance and engine-component brands such as CP-Carrillo, Schrick, AT Power, Acuity, Ripca, and Kent Cams. With technical services and specialist products under one name, JMR Motorsport serves the needs of competition engine preparation and management.