Ringing sound and noise from the hood
 

Noticed when I'm driving i hear almost like a ringing sound after switching gears, give it more gas, its gone, is this natural? Also on two occasions I have heard almost a knocking sound well a sound from the hood, heard it only twice, dont hear it most of the time. Any ideas on what it may be? I kno its not much to go on, just wondering if any of yall wanna take a shot.

If it's a screechy kind of sound, I have it too. I believe it's the brake shield or something to that effect. You're definitely not alone, seems to happen to a lot of people.

wow
 

i was wondering that too..
im from socal and i caught my eyes on your thread
:)
i hate that noise. i get that all the time.
when i idle in gear. it goes *KNOCK KNOCK KNOCK.... on and on*
until i gas....
*sigh*
i want to get rid of that sound.
at first i thought it was my suction kit reloaded
but i took it off and it was still there... lol

Wait I think we're talking about a different noise. Yours is transmission-related. If you do a search in the tech forum, you'll find other people talk about it. I remember reading about it before.

16.The high frequency sound you hear under the hood when the key is on but the engine is off is the electric throttle actuator pushing the throttle butterfly toward closed, waiting for you to start the engine.
17.Every time you first start driving the RX-8 there is an audible “thump” heard from the car. That is the ABS braking system performing a self-test.
36.The Power train Control Module (PCM) carries out a full sixty step test of the Metering Oil Pump (MOP) every twelfth time the engine is turned off.
Maybe this can help!