Originally Posted by
gigaplex
Sounds like my touring cars. Does the pitch of the sound change when you change the drive frequency in the ESC?
Drive frequency was the problem! I had both my 2wd and 4wd ESCs set to "Zero Timing" using the OTA connector and phone app. I assumed that meant all settings were identical. However the PWD on the 2wd as set to 1K, the 4wd was 2K. I changed the 2wd to 2K and the cars sound identical now.
Thank you gigaplex! This was really driving me nuts.