I may be experiencing this same 'sound'. I only have CBE system installed. The sound I hear is similar to the 'struggling rattle' sound of a clutch. It does not affect the performance in anyway, just an annoying sound. I tend to hear this on a hot day when i am cruising in 3rd at 2500rpm and suddenly punch the throttle and there goes the rattle until i reach 3000rpm and goes away. I also hear it on hard acceleration in 1st gear but again , it goes away once 3000rpm is reached. Its an on and off thing.
Your explanation seems to be on point. But just to confirm, could I be hearing the same noise as OP?
Quote:
Originally Posted by DOOMMONKEY777
Ok i know what ur talking about the bearing hitting sound comming from the engine under high stress low rpm and then goes away after 3k rpm, i have that sound 2 and my car only has an oil cooler, i belive its normal sound due to LOW rpm HIGH stress, any engine does that sound Ex: my dad has a hybrid civic when he stops engine is off when he presses gas and he puts the pedal innnn the engine starts and allready in gear under immidiate stress low rpm u can also hear the bearing sound, but after it reaches higher rpm it goes away, it did that for the last 75k miles and still i hear it also so does my z since i bought it 18k miles.
Am not saying am an expert nor i know exactly what ur sound is, but the description maches.
Anyone plz correct me if am wrong.
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