MLWAudio/Searchlight Sims' GE 7FDL Stream

[thecanadianrail]

The RPM numbers are all information I gathered while running with Loco Monitor open on one of the IFDs.

The purpose of the engine holding 1050 RPM is to bring the oil temperature down (especially for the turbo) after being worked hard.

If the engine is maintaining the same amount of RPMs and thus producing the same amount of heat in the engine block for those 45 seconds, how can the oil temperature go down in the meantime? I suppose you could reduce the temperature of the combustion by reducing the turbo's boost pressure via opening up of the wastegate. But if they were employing that method, doing so reduces horsepower and under the same amount of load from the traction motors should logically result in a drop in RPMs. Unless of course the load was somehow reduced as the turbo boost was reduced.... then I can see the 1050 RPMs being maintained.

Also... merely reducing the RPMs in an engine would reduce the oil temperature by default due to less heat being produced by the engine. So delaying an engine RPM ramp down to me seems like simply delaying when it enters a lower notch at which the engine runs cooler. So consider me baffled as to what the 45 second delay really accomplishes or how.

With the load demand reduced (aka the traction motors not asking for more power from the engine) the actual physical demand on the engine will lighten up a bit because of the load change. now keep in mind that the engine oil is at an almost constant temperature which is hot yes but you must remember that a turbo is run from the exhaust which is a much higher temperature than the engine oil, so the turbo is actually going to be much hotter than the oil thus the need for a cool down time.

[buzz456]

With the lightened load the air fuel mixture changes to a lot more air and a lot less fuel so the exhaust gas temperature goes way down thus cooling the turbocharger. From my farming days I remember the John Deere manual stating that their turbo charged engines were to be run at "high idle" for two minutes before shutdown to cool the turbo before shutdown if coming off a high load condition.

[BNSFdude]

Absolutely. You'll notice EMDs with Dash 3 tech or MACs, ACes, and the like wont drop below N3 speeds if the temp is abovery a certain number in order to cool the turbo off.

[BNSFdude]

Another sample. I'm changing some things here and there while I work on the IFD screen textures to make it even more immersive.
https://soundcloud.com/anthony-wood/mlw ... fdl-sample

[BNSFdude]

Yet another, as we've been adding in functioning IFD's I've been plugging sounds into the locomotives to make it follow prototype.
The EOT Pressure change can be heard (when Brake Pipe changes +/- 2psi on the rear), as well as the distance counter. Other highlights include the new traction motor and ambient cab noise of wind. The horn changes dynamically based upon speed to immerse the user further. One can also hear the compressor switch toggle on and off, the computer controlled drain valve solenoid activating the GW 580 dump valves on the main reservoirs and much more!
https://soundcloud.com/anthony-wood/d9sample2