Phoenix Arizona I assume.
For off road nitro in Phoenix you have Scottsdale RC Speedway, Papago RC Raceway and The Nito Pit. All excellent facilities
For 1/10 scale nitro on-road Scottsdale RC Speedway
For Nitro Dirt and Asphalt oval RC sports mania
no 1/8th scale on road nitro as of right now
Other nitro off road tracks in Arizona
Yuma Kiwanis Park
Havasu RC Raceway
Big Time RC (Tucson)
Competitition Hobbies (Tucson)
HobbyTown (Tucson)
There are threads under the Racing Thread just above this one
The tracks change for all but the oval (obviously) 3 to 4 times a year.