10-19-2011, 12:30 PM | #1 |
Private First Class
28
Rep 159
Posts |
Turbo Cool Down
I don't know much about Turbo advancements lately, but I recall something about the old-time turbos where you had to let them cool down before shutting off the car. Anyone remember those days?
With the advancements in Turbo technology, I'm assuming that is no longer an issue coming off the highway or an extended trip.... Thoughts?
__________________
2012 X3 35i | Space Gray | Sand Beige | Sienna
Packages | M-Sport | Cold I & II | Tech | Premium | Sound | BMW Apps, HUD, Net |
10-19-2011, 01:07 PM | #2 | |
Enlisted Member
0
Rep 41
Posts |
Quote:
|
|
Appreciate
0
|
10-19-2011, 01:45 PM | #5 | |
Live for today tomorrow never comes
2010
Rep 9,522
Posts |
Quote:
__________________
Live for now, life is too short.
2023 LCI M5 Marina Bay Blue/ Smoked White Leather, the very last of the F90 M5. |
|
Appreciate
0
|
10-19-2011, 02:56 PM | #7 |
Major
67
Rep 1,041
Posts |
Sorry, don't think so... The N55 engine uses a variable displacement mechanical oil pump. However, the coolant pump is electric.
The oil pump is driven by a small roller chain and some sprockets that look like they were lifted from an old Motobecane! When the engine stops turning, the oil stops flowing to all bearings, including the turbo's. With modern turbos having a liquid cooled turbine/compressor shaft and bearings, along with modern oil formulations, cool down is a thing of the past. Bearing destruction due to oil turning to carbon "coking" when the engine is shut down, does not happen as long as the coolant is at the appropriate level. Last edited by Lotus7; 10-19-2011 at 04:19 PM.. |
Appreciate
0
|
10-19-2011, 03:07 PM | #8 |
Lieutenant General
424
Rep 12,276
Posts |
According to the documentation I've read, the only thing that requires a cool-down period after driving a BMW is your temper, from sitting behind the "left lane hogs".
__________________
I think it is bad luck to be superstitious |
Appreciate
0
|
10-19-2011, 11:26 PM | #9 |
Private First Class
28
Rep 159
Posts |
Nice, thanks guys
I figured as much. Thanks for the input.
__________________
2012 X3 35i | Space Gray | Sand Beige | Sienna
Packages | M-Sport | Cold I & II | Tech | Premium | Sound | BMW Apps, HUD, Net |
Appreciate
0
|
10-20-2011, 05:17 AM | #10 |
Lieutenant Colonel
45
Rep 1,876
Posts |
+1
__________________
|
Appreciate
0
|
10-20-2011, 05:52 AM | #11 | |
First Lieutenant
16
Rep 367
Posts |
Quote:
Engine temperature dictates the need for turbo cool down via engine idle or a turbo timer in trucks / machinery etc. Couldn't imagine these engines getting to those insane temperatures to require it. |
|
Appreciate
0
|
10-20-2011, 05:56 AM | #12 |
Enlisted Member
5
Rep 44
Posts |
I highly doubt that any cool down or idle period is required - anyway, with the STOP/START function it is difficult to do this....unless you switch the feature off every time.
__________________
F25 X3 3.0 d MSport
|
Appreciate
0
|
10-20-2011, 06:40 AM | #13 | |
First Lieutenant
27
Rep 350
Posts |
Quote:
Also I remember that one other problem was that turbo was still rotating quite fast even though in idle. And if the oil was very warm and therefore only thin layer on turbo's axel (ie. bearings), the oil layer ran out when engine was stopped and turbo still rotating fast and no new oil pressed into the bearings. |
|
Appreciate
0
|
10-20-2011, 06:42 AM | #14 | |
First Lieutenant
16
Rep 367
Posts |
Quote:
A turbo timer is simply an electronically controlled oil accumulator which feeds oil to the turbo after car/truck/machine has been shut down through ignition. |
|
Appreciate
0
|
10-20-2011, 11:31 PM | #15 | |
Private First Class
5
Rep 125
Posts |
Quote:
Have to admit I'm an old fashioned guy and still give my cars a little time to breath and cool (water, oil, brakes) before shutting it down, especially after extended time at high(er) speeds on the autobahn. When coming home this happens automatically cause I need 15/20 minutes from autobahn. But I really watch it when going to a rest or gas station, or after driving steep mountain passes. |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|