Press ~ (tilde) to access console then enter following cheats:

Cheat - Result:

PASS - Win Race
FAIL - Lose Race
WIREFRAME - Wireframe
SHOWSOMEDEBUG - Show Debug
MEMREPORT - Report Memory
AUTOMEMREPORT - Report Memory (causes performance lag)
EXIT - Exit Game
VER - Shows Engineversion
FPS - Framespersecond Counter
FAILEDURMISSION - Unknown effect
NEXTURMISSION - Unknown effect
ATVAIRECORD - Unknown effect
TELEPORT - Unknown effect
USEDTEX - Unknown effect
UNUSEDTEX - Unknown effect
VSYNC - Unknown effect
PRINTMLPSTACK - Unknown effect
GETTIMESCALAR - Unknown effect
SETTIMESCALAR - Unknown effect
SETWARNINGLEVEL - Unknown effect
VBSWITCH - Unknown effect
TEXSWITCH - Unknown effect
VERTEX - Unknown effect
POLY - Unknown effect
PATHSTEPSIZE - Unknown effect
AISTEPSIZE - Unknown effect
CUTMISSION - Unknown effect
FREECAM - Unknown effect
CUTTIME - Unknown effect
CUTSAMPLE - Unknown effect
CUTINDEX - Unknown effect
CAMERAEDITOR - Unknown effect
SETSTEPSIZE - Unknown effect
GIMMESOMETIME - Unknown effect
JUMP - Unknown effect
LENSFLARE - Unknown effect
FLARESAVE - Unknown effect
SHOWNODES - Unknown effect
SHOWRESPAWNS - Unknown effect
SHOWSOUNDS - Unknown effect
REIGNINBLOOD - Unknown effect
INTROCAMEDITOR - Unknown effect
GAMEDEBUGSTUFF - Unknown effect
CANNON - Unknown effect
NEXTURMISSION - Unknown effect
MINIGUN - Unknown effect
TELEPORT - Unknown effect
GOD - Unknown effect
CARCAMEDIT - Unknown effect
CARCAMSETLERP - Unknown effect
CARCAMSETVIEWCAR - Unknown effect
CARCAMSETATTACHED - Unknown effect
SAVECARCAM - Unknown effect