Car Ringing Quietly

[Galois]

Hey guys,

I was listening to the car idle yesterday with my head in the engine bay and noticed a slight ringing, trying to think og how to describe it, maybe like rotating a bell so that the tongue thing grazes around the outside rather than shaking it to cause impact between the tongue and bell. that was poor haha

yeah, so anyways what exactly does pinging sound like? and has anyone noticed this before? it'd be fantastic if i just had to tighten a bolt, but it's never that easy.

car is an r34 gtt with cat back exhaust, stock elsewhere but running an indicated 12-13psi for reasons i have not yet found

thanks for any help/advice!

[SlowSkyline]

if ur running that much boost that could be the sound of your turbo on the way out, does it get louder as revs rise or when u hit boost? pinging is a yucky noise it sounds like pieces of metal tapping loudly together.

[Galois]

ahh, that's good news about pinging and bad about the turbo. figuring out why the boost is so high is now top of the list lol.

it was only ringing on idle, and it couldn't be heard in the cabin, so not sure if the noise is there on boost. i used the throttle control in the engine bay to increase revs and it disappeared, then reappeared very faintly at (guessing) 2500rpm, like it was something vibrating.

if it was the turbo, would it only make noise on boost?

what does high boost stress from the turbo, the impeller or compressor? and im guessing a new stock gtt turbo is pretty costly?

[SlowSkyline]

it would make more noise on boost normally, like a loud shreaking noise, or grinding if its blown a turbo.

a second hand one in good nick is usually $300, so not that much, can also get them reconditioned.

im no mechanic, and fairly new with these cars, best bet is take it to a mechanic or better a performance shop they could tell you in minutes.

[Galois]

sweet, thanks mate. it's just making a clean spooling noise when on boost, so hoping its something else. i'll have to find a performance shop round here (newcastle) to have a look

[mad082]

if you are getting pinging at idle then you have issues. but i'd say that it isn't pinging and it is possibly a worn bearing in the clutch. or a pulley bearing. but it is very hard to say without hearing it.

also turbo noise would get worse when you hit boost if it was dying.