Hi everyone. As you all can tell, I just signed up on this board. I’m a newbie when it comes to audio and recording. I just recently purchased an Audio-Technica ATR3350iS Lavalier Microphone to use with my iPhone. I mounted my phone on a suction cup mount inside my car, and wired the microphone out the window onto my rear bumper. I placed the mic about 20 inches away from my exhaust tips and tried recording a video. Video looks great, but the audio, not so much. The audio that has been recorded sounds very staticy. (for the lack of better words).
I was wondering if there is any way that I could improve the sound, whether it is by editing with audacity, or anything else. Any lights shed on this would be greatly appreciated! Thank you 
You are overloading the microphone or the recorder. The sound is much too loud for the method you’re using.
Import the sound into Audacity and select View > Show Clipping. All those red stripes indicate permanently damaged sound. That’s assuming you’re not moving. If you are, flapping, popping wind noise is going to kill your recording.
Koz
Making the California Coast® BMW Commercial isn’t as easy as it looks.
I’d probably shoot the motor non-moving in a quiet environment and dub it in with post production. Play the video to the driver so they can match the motions. Do it multiple times.
Koz
Sound kills more shows than video…
Koz