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I Dont Like The Sound Of This...

rednut

By rednut,
in General Maintenance

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rednut Collaborator

rednut

Posted
Posted

Hoping someone can put my mind at ease and give me an idea of what this awful sound might be... :boohoo:

If i driving along and rev the car with anything more than half throttle over 3.5k/4k rpm, a real loud, mechanical type noise comes from under the bonnet. It almost sounds like a whistle being blown into really, really, really hard - like by compressed air or something. Now if the car is idle and i floor it and rev over 4k rpm, this sound does not occur.

I initially thought it was my turbo, so i had a cry, started cursing randomly, kicking things and abusing random passers by from my balcony. I then composed myself and thought about it and went for a drive. In 4th at 100km/h, i floor it and sure enough, full boost comes on and i'm away - but no sound (not that i could hear anyway). So i was a but confused after this...for reference, below i have listed previous issues by car has had and current mods

Previous Issues:

1 - my power steering belt just came off one night under normal driving. They have 3 "ribs" and one of them just sheared off!

2 - on a HOT (track temps 50 deg +) track day at Eastern Creek my power steering fluid shat itself all over my engine bay, refilled it and all seemed well

Mods:

Apexi PowerFC

3" cat back exhaust

Pod type ir filter

Bleed type Boost Controller (boost now up to 11-12psi)

My bro reckons it could be my injectors but after writing this and seeing the 2 issues with the power steering - maybe its that...anyone?

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https://www.sau.com.au/forums/topic/62034-i-dont-like-the-sound-of-this/
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GTRgeoff Grand Master

GTRgeoff

Posted
Posted

Just a starter, try checking the gaskets on the exhaust and inlet. Do this cold with the car running and use a spray bottle to get the water onto the intake and exhaust manifold joins on the head and the turbo mount. If you have bubbles it's a leak. if not that's one less cause.

Timd Community Regular

Timd

Posted
Posted

my rb20 was making the same whistling sound. It was an exhaust gasket. Would only happen at certain revs, very annoying. the gasses play the gasket like a reid .DOnt know which gasket it was as there were a few gone. Check them like Geoff said. It should be pretty obvious if its leaking that bad

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