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 .
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.
01-01-2011, 09:26 AM
So, no motor oil circulates thru the supercharger at all?
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:
12-26-2011, 04:54 PM
Here is a great Service Training manual download of the engine :
That was excellent. I spent the last couple of hours reading.
02-02-2012, 11:50 AM
Just finished reading this and wanted to say thanks for posting it!
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.