different torque at given rpm --> different fuel economy?

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chung390
Posts: 14
Joined: 04 Jan 2017 12:22

different torque at given rpm --> different fuel economy?

#1 Post by chung390 » 20 May 2017 13:34

I made some sort-of-bus engines with almost no power before 1400rpm (to simulate the crappy turbos)
engine: 1500nm
torque_curve[0]: (300, 0)
torque_curve[1]: (450, 0.61)
torque_curve[2]: (900, 0.65)
torque_curve[3]: (1300, 0.71)
torque_curve[4]: (1400, 1)
torque_curve[5]: (2000, 0.78)
torque_curve[6]: (2900, 0.34)

and according to the 'instant' consumption screen,
about 1350-->1400rpm in fifth (6sp) has consumption of 50.6-51.0l/100km
when the needle comes to 1500rpm it is 68.1l/100km.
Experiences with in-game stock engines tell me they aren't like that. Is torque a parameter?
b101uk
Posts: 361
Joined: 21 Dec 2012 08:35
Location: UK

Re: different torque at given rpm --> different fuel economy

#2 Post by b101uk » 26 May 2017 09:29

you have more power at 1400rpm than you do at 1300rpm, you have more power at 2000rpm, than at 1400rpm, you even have more power at 2900rpm than you do at 1300rpm

thus by logical extension, 1500rpm will use more fuel than 1400rpm, 1600rpm will use more fuel than 1500rpm, 1700rpm will use more fuel than 1600rpm etc etc etc, assuming you are using all the available power at that particular rpm point.

which tells us, that if we use a flat g/kWh figure, that at any incremental RPM above >1300rpm and below <2900rpm will use more fuel than 1300rpm itself, if we are using all the available power at that RPM point, in reality g/kWh graph across the rpm range are concave in shape with the lowest thus most efficient point being centred on the peak torque RPM, and the least efficient highest points being somewhere between peak power and rated power RPM points (should peak power and rated power be at different RPM's)
RichardDiaz
Posts: 1
Joined: 11 Jul 2017 11:26

Re: different torque at given rpm --> different fuel economy?

#3 Post by RichardDiaz » 11 Jul 2017 11:30

Good to know!
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