An inboard gear cluster was used to accommodate the presence of a full-width diffuser panel at the rear of the chassis.

[1] A Magneti Marelli ignition was used in lieu of a conventional distributor, since the Judd EV had a narrower vee angle of 78°.

[2] The CG891 carried sponsorship from Leyton House (the title sponsor for the team), BP, Philips, Autoglass, Daivia, Cobra, Osama, AMK and Fiamm.

[3] The CG in the car's designation stood for Cesare Gariboldi, a Leyton House March team manager who was killed in a road accident in the winter of 1988/1989.

The French race had been particularly promising for the team; Capelli had run as high as second at one stage but retired with engine problems.