Shut off car and I hear this.... - Page 2

nhouck · 03-29-2008, 12:59 PM

My brother who tends to know these things told me that sound is the turbo spooling down. Nothing to worry about, you just got a cool ass sounding car.

Philip Swanson · 03-31-2008, 06:56 PM

The sound your hearing is the TURBO winding down and it is normal. You will hear this even if you let the engine idle before shutting down. The reason is because most turbo's spin at approx. 60 - 90,000 RPM , this is why oil change intervals are so critical in these cars. The only time you really may want to let the turbo cool down is when it's been driven very hard (as in racing) or comming diectly off a long drive at highway speeds.

pablo_ottawa · 04-06-2008, 07:33 AM

Quote:

Originally Posted by nhouck

My brother who tends to know these things told me that sound is the turbo spooling down. Nothing to worry about, you just got a cool ass sounding car.

HEY GUYS!!!!

UPDATE! THIS IS NOT YOUR TURBO SPOOLING DOWN. It's the fans from your climate control system. How do I know??? Well I tend to knw these things lol.

No, I was curious because for a turbo fan to spool down that long, it would have to be quite big and VERY free of any resistance. Oil, regrdless of it's viscosity is still quite restrictive, and it has to be because it needs to be thick enough to maintain a lubricating film over engine parts at high temperatures therby doing it's job. OK I'm rambling.

The reason I know this is because last night I turned the key to the on position. Of course, climate control kicked in and I distinctly heard the fans SPOOL UP. When I turned the key to the off position, the fans spooled down thus making the noise we all know and love. TRY IT AND SEE FOR YOURSELF.

So NHOUK, your brother is WRONG LOL

ste2008 · 08-10-2008, 05:21 PM

Guys I think the sound you are hearing is not the turbo or air con but the fuel pump switching off.

s3forspeed · 08-15-2008, 02:46 AM

I have the same noise on my S3

alexbnk · 08-15-2008, 08:07 AM

It's the fans in my opinion , especially when u turn off with AC on , and i actually like this, though it should not be loud , slightly noticeable . Really lound might point on some fans bearings wear.

03-31-2008, 06:56 PM	#12 (permalink)
Philip Swanson Newbie Join Date: Oct 2007 Location: Audirondacks Posts: 9 Gallery: (0)	The sound your hearing is the TURBO winding down and it is normal. You will hear this even if you let the engine idle before shutting down. The reason is because most turbo's spin at approx. 60 - 90,000 RPM , this is why oil change intervals are so critical in these cars. The only time you really may want to let the turbo cool down is when it's been driven very hard (as in racing) or comming diectly off a long drive at highway speeds. __________________ AUDIRONDACK CRUIZER

08-10-2008, 05:21 PM	#14 (permalink)
ste2008 Newbie Join Date: Aug 2008 Posts: 1 Gallery: (0)	Sound Guys I think the sound you are hearing is not the turbo or air con but the fuel pump switching off.

08-15-2008, 08:07 AM	#16 (permalink)
alexbnk Newbie Join Date: Jan 2007 Posts: 8 Gallery: (0)	Jet engine off :) - i like it and i think is normal It's the fans in my opinion , especially when u turn off with AC on , and i actually like this, though it should not be loud , slightly noticeable . Really lound might point on some fans bearings wear.

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03-29-2008, 12:59 PM	#11 (permalink)
nhouck Newbie Join Date: Mar 2008 Posts: 6 Gallery: (0)	My brother who tends to know these things told me that sound is the turbo spooling down. Nothing to worry about, you just got a cool ass sounding car.

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08-15-2008, 02:46 AM	#15 (permalink)
s3forspeed Newbie Join Date: Jul 2008 Posts: 6 Gallery: (0)	I have the same noise on my S3

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