by FHRob » Mon Oct 26, 2015 4:57 pm
by JohnS » Mon Oct 26, 2015 6:36 pm
by FHRob » Mon Oct 26, 2015 6:51 pm
JohnS wrote:I'm not sure on the physics of these. I guess I could google it but I can adjust the braking. That's about all I can do
by JohnS » Mon Oct 26, 2015 7:02 pm
by jalsina » Mon Oct 26, 2015 7:24 pm
by Ericmopar » Mon Oct 26, 2015 11:11 pm
jalsina wrote:A problem with the SD75M is that it accelerates and decelerates too fast. It seems like overpowered. It is quite difficult drive it in a yard below 15mph.
The brakes are not ok either, but are better than other old DLC.
by jalsina » Mon Oct 26, 2015 11:40 pm
Ericmopar wrote:I don't know how to adjust it, but I think it's the tractive effort vs speed and tractive effort vs throttle settings.
It' got the same physics as the SD70s.
by dtrainBNSF1 » Tue Oct 27, 2015 9:10 am
by jalsina » Tue Oct 27, 2015 9:27 am
by dtrainBNSF1 » Tue Oct 27, 2015 9:54 am
jalsina wrote:Besides the Tractive Effort vs Speed there is also a Tractive effort vs Throttle curve.
I believe the issue with the deceleration is related to this second curve because when you cut throttle the speed falls pretty fast.
These two curves are easy to edit but i don´t have reliable data, other than trial and error.
The SD75 pack has the two models, the SD70M and the SD70I
The SD75I has no simulation folder. This means it must be using the same data than the SD70M, which may be right, but not sure. I read somewhere that the difference was the whisper cab for the I model.
by dtrainBNSF1 » Tue Oct 27, 2015 10:07 am
dtrainBNSF1 wrote:jalsina wrote:Besides the Tractive Effort vs Speed there is also a Tractive effort vs Throttle curve.
I believe the issue with the deceleration is related to this second curve because when you cut throttle the speed falls pretty fast.
These two curves are easy to edit but i don´t have reliable data, other than trial and error.
The SD75 pack has the two models, the SD70M and the SD70I
The SD75I has no simulation folder. This means it must be using the same data than the SD70M, which may be right, but not sure. I read somewhere that the difference was the whisper cab for the I model.
It's using the same data as the SD75M, which is actually the same data used in the SD70Ace packs.
To calculate the curves you need to know the following:
1) The loco's maximum continuous tractive effort
2) How much horsepower the loco can still use after going through the alternator (DC locomotives usually still have somewhere in the vicinity of 80% of their horsepower left after transmission, AC locomotives are usually higher, around 90% or so).
from there plug it into this formula:
kN=(kW*3.6)/speed(km/h).
by JohnS » Tue Oct 27, 2015 12:24 pm
by FHRob » Tue Oct 27, 2015 2:17 pm
JohnS wrote:I did find something interesting. The sim doesn't read Horsepower. It only reads in KW. weird! Anyway, looking at the spec sheet for the engine it's 4300 horsepower @ 3200KW. The manual says that 1KW = 1.341Hp. So if want 4300Hp put 3200KW in this field not the horsepower of the engine.
by dtrainBNSF1 » Tue Oct 27, 2015 2:32 pm
FHRob wrote:JohnS wrote:I did find something interesting. The sim doesn't read Horsepower. It only reads in KW. weird! Anyway, looking at the spec sheet for the engine it's 4300 horsepower @ 3200KW. The manual says that 1KW = 1.341Hp. So if want 4300Hp put 3200KW in this field not the horsepower of the engine.
Just to clarify:
In the simulation.bin file, change 4300 to 3200KW or 3200 without KW? And do capital letters matter?
by jalsina » Tue Oct 27, 2015 2:39 pm
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