Technical data Resources (Engines and gearboxes)

[Snoman]

Big thanks for @rookie_one who's make this compilation of manufactures technical data sheet or brochure.

So guys, I'm in a progress of making realistic engines for ATS, covering CAT C15 ACERT, Cummins N14 Plus and Detroit Diesel 60 Series, and all this would be impossible if not because his compilation of data.

Now I'm facing this issue, how am i calculate the best rpm range low gear and rpm range high gear to get the most realistic settings. I think i need a little bit of help from our engine guru Mr. @galimim

Regards,
AJ

Realistically most of those engines would have been paired with a manual, but this is how I setup my engines

rpm_range_low_gear: I set this up to shift at lower rpm, because this is how you would shift a manual and you have the gear ratio advantage. Some of the trucks I have driven IRL are setup to shift at higher rpm in low gears and lower rpm in high gears though. So creating something realistic is sometimes very difficult.
A good rpm range for skip shifts is 600-700rpm

rpm_range_high_gear: I set his up to shift at higher rpm since you no longer have the gear ratio advantage and you need to spin the engine a little more to maintain acceleration
A good rpm range to not skip shifts is 450-550rpm

rpm_range_power: I set this up to a range that works well for the specific gearbox I plan on using for thie engine. typically its around (1100, 1600) depending on the torque curve and hp peak rpm

Here are some examples from my cascadia

DD13: I set this up to shift at a bit higher rpm range because the power levels are typically lower
rpm_idle: 600
rpm_limit: 1900
rpm_range_low_gear: (800, 1400)
rpm_range_high_gear: (1050, 1550)
rpm_range_power: (1100, 1650)
rpm_range_engine_brake: (1300, 1900)

DD15: Middle rpm range to achieve better economy
rpm_idle: 600
rpm_limit: 1900
rpm_range_low_gear: (750, 1350)
rpm_range_high_gear: (975, 1500)
rpm_range_power: (1025, 1625)
rpm_range_engine_brake: (1300, 1900)

DD15V: This is what I call a vocational tune that will shift much higher and I typically use in day cabs that do many deliveries over short distances. Like in real life
rpm_idle: 600
rpm_limit: 1900
rpm_range_low_gear: (850, 1500)
rpm_range_high_gear: (1025, 1625)
rpm_range_power: (1025, 1625)
rpm_range_engine_brake: (1300, 1900)

[Aji Damarjati]

@Snoman Gee, thanks for sharing! I will tr it out that setup. Some engines have their peak torque up to 1600, 1700 rpm, should i count it as consideration to set the rpm range for gear changing?

[Snoman]

Most newer diesels reach peak torque around 1400-1500, but there are a few cummins that push it out to 1600. Then there are engines like the detroits and international that peak between 900-1000rpm but the torque carries out to 1400rpm or so.

This is how I think about it. Keeping a diesel in its peak torque range, is using the engine most efficiently. You have the most pulling power, but you are keeping the rpms lower which improves fuel economy. The trade off is slower overall acceleration. Revving a diesel out closer to its peak HP improves acceleration at the cost of fuel economy. When I create my mods I try to reach a balance between economy and pulling power, but also make each truck have its own driving style.

Trucks like the W900 and 379 I only drive with a manual, so I have not done a custom engine tune on those.
Full sleeper trucks I tend to use more economy based tunes and lower differential ratios for good economy over long drives.
Day cab trucks I tend to use lower hp engines with higher rpm tunes with higher differential ratios, so they can still pull heavy loads if needed.

I drive with a controller. In the game I changed the adaptive automatic transmission setting to Eco mode. This allows me to force a downshift or shift a little past the engine settings depending on load and throttle position. Because of this the settings I use may not act the same way for your game setup.

At the end of the day you mod the engine to suit your driving style. That is why we mod and that is what makes the game much more enjoyable.

[Aji Damarjati]

N14 Celect+ & DD 60 Series (2007 14.0L) done, each have about 12ish variants. I have a little problem with Cat C15 regarding it's clutch engagement torque. For N14, i found it's the same in the entire variant, 900 lb.ft @ 800 rpm, and for DD 60 Series, i found one from Australia's Detroit brochure that their DD60 have 962 lb.ft but not stating the rpm, since N14 and DD60 have similar displacement, so i assume their clutch engagement torque could be similar at 800 rpm.

In the other hand though, i cannot find clutch engagement torque for Cat C15 ACERT. For now, I'm using ETS2/ATS default torque curve for the C15 (300, 0 ; 440, 0.5)

[Snoman]

I have 940lbft at 700rpm in my notes, but dont have a spec sheet that confirms it.

@rookie_one there are some Australian MP10 specs around. Probably not the exact same curve as a NA model but it gives a tuner a starting point.
https://www.macktrucks.com.au/powertrai ... 10/#charts

[rookie_one]

Thanks @Snoman , but I think the north american version of the Volvo D16 might be a better starting point, since they are basically the same engine with a slightly different tune

[Snoman]

Yeah that is true, Mack just likes to add 5-15hp to the Volvo engine and usually 10lbft of torque, just so they can say its a more powerful engine lol.

I did find the following options for a 2013 US Mack Titan, but still no power curves.
MP10-525C 525hp@1500-1700
MP10-565C 565hp@1600-1800
MP10-605C 605hp@1600-1800
MP10-515M 515hp@1500-1900
MP10-555M 555hp@1500-1900

[al_batros]

"As an Industry-first, IVECO-FPT now includes Torque-curves on some of their engine datasheets."
(Excuse my sarcasm, but this seems to be new, as some time ago, their datasheets didn't have any torque/hp curves included, now I was able to see them on at least a few engines.)
So if you want to buy some lottery-tickets, ...
https://www.fptindustrial.com/en/engines/Onroad/Trucks -> Cursor 9, 11, 13
https://www.fptindustrial.com/en/engine ... /CURSOR-11
https://www.fptindustrial.com/en/engine ... /CURSOR-13 -> Klick on Datasheet for PDF Download, open to check for hit or miss.
The one XCursor Engine I checked, didn't have a curve

Same here with bus engines:
https://www.fptindustrial.com/en/engines/Onroad/Buses -> Cursor 9 -> 294KW has a torque curve, didn't check the others as this is the engine in the Evadys.

second topic:
Cummins L9 torque curves:
https://www.internationaltrucks.com/engines/cummins-l9 -> Scroll down page for link to spec.pdf with multiple curves.
same procedure for the B6.7:
https://www.internationaltrucks.com/engines/cummins-b67

[Aji Damarjati]

Looking for Cummins NTC Big Cam specs, thanks.

[Aji Damarjati]

Hi @rookie_one, i accidentaly found Cat C-15 data sheet from 1999, so it's a pre-ACERT motors and i safely assume it's the legendary 6NZ C-15. It covers 435-550 hp ratings.
Feel free to add this to your Google Drive folder. Cheers.
Link : https://drive.google.com/file/d/1ZADgbl ... drive_link
[ external image ]