Do i need to let the car idle afterwords to "cool down" the supercharger

skiracerblah · 12-30-2010, 07:49 AM

I came from the turbo world and know minimal about superchargers. In the S4, do i need to let the engine idle for a minute or two after stopping to cool down the supercharger?

I know with turbo'd cars, you should do it to let oil circulate thru the turbo to prevent the oil from burning up inside .

Aggie88 · 01-01-2011, 08:10 AM

Turbocharger impellers are driven by hot exhaust gases and build a lot of heat. The supercharger rotor(s) are driven by a belt.

skiracerblah · 01-01-2011, 09:26 AM

So, no motor oil circulates thru the supercharger at all?

Aggie88 · 01-01-2011, 10:28 PM

There is oil in the supercharger. But I don't know if it is internal to the engine sump or external. But the oil does not see those extreme temps like a turbocharger sees. Here is a great Servie Training manual download of the engine:

http://www.s4-mtm.com/images/925803_3.0V6TFSIengine.pdf

skiracerblah · 01-02-2011, 08:14 AM

Sweet, thank you!

tianxiai · 01-05-2011, 05:41 PM

so can also

tenspeed · 12-26-2011, 04:54 PM

Quote:

Originally Posted by Aggie88

Here is a great Service Training manual download of the engine :

That was excellent. I spent the last couple of hours reading.

dtmurf · 02-02-2012, 11:50 AM

Just finished reading this and wanted to say thanks for posting it!

auditechjs · 02-09-2013, 01:57 PM

To the OP, no, you don't have to let it idle. The car has what's called an "after-run coolant pump" that circulates coolant thru the supercharger intercoolers so they don't overhead from heat soak.

-Jesse

01-01-2011, 08:10 AM	#2
Aggie88 AudiWorld Member Garage is empty, add now Join Date: Jan 2007 Posts: 351	Turbocharger impellers are driven by hot exhaust gases and build a lot of heat. The supercharger rotor(s) are driven by a belt. __________________ ...........The Good.............................The Bad..........and..................The Ugly........... (Start George Thorogood guitar line here)

01-01-2011, 09:26 AM	#3
skiracerblah AudiWorld Member Garage is empty, add now Join Date: Dec 2010 Location: Los Angeles Posts: 443	So, no motor oil circulates thru the supercharger at all? __________________ Sorry for newbie questions, this is my 1st Audi Current:'2011 S4 S-Tronic Premium Plus, Sports Rear Diff, JL Audio subwoofer upgrade Old cars: Evo X MR-Touring stock, but tuned by RRE: 290whp, 313 lbs/torque @ 24psi 91 octane Evo IX tuned by RRE: 383whp, 383 lbs/torque @ 28psi E85 ethanol fuel Evo VIII: Lemon POS!

01-01-2011, 10:28 PM	#4
Aggie88 AudiWorld Member Garage is empty, add now Join Date: Jan 2007 Posts: 351	There is oil in the supercharger. But I don't know if it is internal to the engine sump or external. But the oil does not see those extreme temps like a turbocharger sees. Here is a great Servie Training manual download of the engine: http://www.s4-mtm.com/images/925803_3.0V6TFSIengine.pdf __________________ ...........The Good.............................The Bad..........and..................The Ugly........... (Start George Thorogood guitar line here)

01-02-2011, 08:14 AM	#5
skiracerblah AudiWorld Member Garage is empty, add now Join Date: Dec 2010 Location: Los Angeles Posts: 443	Sweet, thank you! __________________ Sorry for newbie questions, this is my 1st Audi Current:'2011 S4 S-Tronic Premium Plus, Sports Rear Diff, JL Audio subwoofer upgrade Old cars: Evo X MR-Touring stock, but tuned by RRE: 290whp, 313 lbs/torque @ 24psi 91 octane Evo IX tuned by RRE: 383whp, 383 lbs/torque @ 28psi E85 ethanol fuel Evo VIII: Lemon POS!

02-02-2012, 11:50 AM	#8
dtmurf AudiWorld Member Garage is empty, add now Join Date: May 2008 Location: Belgium Posts: 139	Just finished reading this and wanted to say thanks for posting it! __________________ Q5 2.0T Moonlight Blue PP (order 27 Oct 11)

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01-05-2011, 05:41 PM	#6
tianxiai AudiWorld Newcomer Garage is empty, add now Join Date: Jan 2011 Posts: 3	so can also

02-09-2013, 01:57 PM	#9
auditechjs Audiworld Junior Member Garage is empty, add now Join Date: Feb 2013 Posts: 13	To the OP, no, you don't have to let it idle. The car has what's called an "after-run coolant pump" that circulates coolant thru the supercharger intercoolers so they don't overhead from heat soak. -Jesse

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