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1987 S3 HCI (turbo ?) whistling - Induction/Turbo/Manifold/Exhaust - The Lotus Forums Jump to content
nanardos

1987 S3 HCI (turbo ?) whistling

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Hi Everyone

 

There is a harsh "whistling" that comes from the engine bay when I change gears up at high revs

(from around 4.000 rpm)

I suspect this comes from the turbo , any ideas ?

 

Regards

 

Nanardos

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Upgrade today to remove Google ads and support TLF.

it`s supposed too enjoy it!

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I am not talking about a pleasant turbo whistle

but rather a loud hiss

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Then you should look for a leak in the induction system.

Maybe your dump valve?

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Check for leaks around the plenum.

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Is it defo air hiss or a screaming type of whistle....... If it's screaming - check oil supply.....

Turbo hose popped off is always a favourite ......

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It is the screaming type

Short but very loud when I change gears above 4.000 rpm

I was also thinking of turbo worn bearings ?

 

Anyway thanks everyone for your help

 

nanardos

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He the hoses off and check for end float in the turbo impeller

Any wobble will be obvious,, make bad noises, and usually go bang in a few hundred miles

Take not he......am I the only one that has issues on iphings !!

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Barry - is that the mushrooms speaking :)

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On my car, One of the brass fittings in the intake from plenum to the carbs had s slight crack in, obviously only appeared when nailing it.

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