Below is a list of all the known cheats for Rally Championship.
To enable the cheat enter the code as the name of player four.

CHEAT CODE	FUNCTION
arcade action	Play pong on your windscreen!
arcade unlimited	Play any arcade level
turbo challenge	A8 cars in time trial mode
world class	Unlock A8 championship
give me time	Press 't' in service area for a minute extra
captain reversi	Reverse the tracks
spud car	Drive the Turboater
lambaaghini	Drive the Lambaaghini
mooserati	Drive the Moo 1.8bse turbo
furry dice	Drive Bernie's dice mobile
skip	Drive the Skip
radio car	Drive the Radio Control Car
tree hugger	Drive the welsh sheep wagon
max power	Drive the Max power car
mf hotback	Drive the MF hothatch
group b	Drive the MF Turbo
precious things	Drive the Local Shop
throw me a bone	Drive the Max Power WRC
dont touch the things	Unknown
toe the line	Unknown
down the road	Unknown
blarby garby	Unknown
head transplant	Unknown