Euro Truck Simulator 2

Euro Truck Simulator 2

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Knottypine Feb 7, 2013 @ 5:20pm
Retarder
What does this setting do? How is it used?
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Showing 1-14 of 14 comments
Maverick Feb 7, 2013 @ 5:32pm 
It works like the Jake Brake but you can increase/decreases it's effect.

WIKI: Diesel powered vehicles

Diesel engined vehicles do not have a throttle. Diesel engines regulate power output purely by the volume and timing of fuel injected into the cylinders combustion chambers. The engine braking generated by creating partial vacuum with a closed throttle at each intake stroke in petrol/gasoline engines does not apply to diesel engined vehicles - diesel engines are quite 'free-running'. However Clessie L. Cummins, founder of Cummins Engine Company, realized that by opening the cylinder exhaust valves when the piston reached top dead centre, rather than at the end of the power stroke, the accumulated compressed air in the cylinder could be vented before it could act as a 'spring' to drive the piston back down again. By doing this, the engine acts as an air compressor, with the energy coming from the transmission used to compress the air, hence slowing the vehicle. The amount of power extracted from the transmission can be up to 90% of the rated power of the engine for certain engines.
Last edited by Maverick; Feb 7, 2013 @ 8:06pm
Knottypine Feb 7, 2013 @ 5:33pm 
So when it's enabled, is it automatically engaged when I press the brakes or jake brake?
Maverick Feb 7, 2013 @ 5:37pm 
No. When it's engaged (with a switch/button/keystroke) it continues to operate but you must have speed for it to work. It transfers power from the trans to create compression. You can actually leave your throttle wide open and it stills works.

A "beautiful" sound when going downhill fully loaded :)

EDIT - Just for the record, the Jake Brake (which istechnically an exhaust brake - rather than an engine brake - is the one that is supposed to be engaged and stay engaged when you take the foot off rather than the on/off use as in ETS2.
Last edited by Maverick; Feb 7, 2013 @ 5:51pm
Knottypine Feb 7, 2013 @ 7:03pm 
Ah thanks.
Xivios Feb 7, 2013 @ 7:05pm 
^ Jake Brakes aren't exhaust brakes, they can utilize the exhaust valves and dump compression to the exhaust system, but they aren't considered exhaust brakes because they don't utilize exhaust gases directly, rather they utilize the compression within the closed cylinder.

Exhaust brakes cause a restriction in the exhaust to slow a vehicle, Jake brakes release compression in the cylinder so that it can't push the piston back down to slow a vehicle.

Jake brakes were already in the game prior to the patch.

I asked a former trucker what the retarder actually was, the retarders added to the game are hydraulic retarders, acting on the transmission. Wikipedia describes them as such;

Hydraulic retarders use the viscous drag forces between dynamic and static vanes in a fluid-filled chamber to achieve retardation. There are several different types which can use standard transmission fluid (gear oil), a separate oil supply, or water.

A simple retarder uses vanes attached to a transmission driveshaft between the clutch and roadwheels. They can also be driven separately via gears off a driveshaft. The vanes are enclosed in a static chamber with small clearances to the chamber's walls (which will also be vaned), as in an automatic transmission. When retardation is required, fluid (oil or water) is pumped into the chamber, and the viscous drag induced will slow the vehicle. The working fluid will heat, and is usually circulated through a cooling system. The degree of retardation can be varied by adjusting the fill level of the chamber.

Hydraulic retarders are extremely quiet, often inaudible over the sound of a running engine, and are especially quiet in operation compared to engine brakes.
Krusty Feb 7, 2013 @ 7:19pm 
A Retarder acts on the Torque Converter, not the transmission.
Maverick Feb 7, 2013 @ 7:53pm 
Originally posted by Xivios:
^ Jake Brakes aren't exhaust brakes, they can utilize the exhaust valves and dump compression to the exhaust system, but they aren't considered exhaust brakes because they don't utilize exhaust gases directly, rather they utilize the compression within the closed cylinder..[/i]
w/o spliiting hairs, a Jake Brake can also be an exhaust brake - it can use a valve to close of the exhaust creating higher engine compression. Jake Brakes use one of several systems - the one you described is another. (see http://www.jacobsvehiclesystems.com/technology/)

(EDIT - I'd argue that the JB in ETS2 is an exhaust brake too. You don't get that burble off a compression release system from memory.)

And yeah, judging by the sound of the new "retarder" in ETS2 it's hydraulic.

And Krusty - Allison make a hydraulic retarder that works on the trans on driveshaft side of gearbox, (and one on the TC - input side). What one are you talking about? I'm assuming you have a different brand/type in mind? (Cat?)

For the sake of brevity for non-technically-minded, ETS2 employs a "Jake Brake" - ON/OFF and a new "retarder" with variable control.
Last edited by Maverick; Feb 7, 2013 @ 8:01pm
Rumpelcrutchskin Feb 7, 2013 @ 8:13pm 
I dont know what it actually does but I like the sound it makes when braking. :p
Last edited by Rumpelcrutchskin; Feb 7, 2013 @ 8:18pm
Maverick Feb 7, 2013 @ 8:18pm 
Originally posted by Rumpelcrutchskin:
I dont know what it actually does but I like the sound it makes when breaking. :p
Try not to break it - it won't work when you need it for braking :)
Rumpelcrutchskin Feb 7, 2013 @ 8:20pm 
Originally posted by Maverick:
Originally posted by Rumpelcrutchskin:
I dont know what it actually does but I like the sound it makes when breaking. :p
Try not to break it - it won't work when you need it for braking :)

Oops, 10 seconds before my brain figured out that something was slightly wrong lol.
Gimme a break, It's 6.00 here and I havent got my coffee yet. :p
Last edited by Rumpelcrutchskin; Feb 7, 2013 @ 8:22pm
Knottypine Feb 8, 2013 @ 1:14pm 
So I see an option to select which controls increase/decrease the retarder, but no not actually see how to engage it. :/ Am I missing something?

**Ok I guess I just need to upgrade my gearbox.
Last edited by Knottypine; Feb 8, 2013 @ 1:41pm
TfR Magic Feb 8, 2013 @ 2:32pm 
Originally posted by Krusty:
A Retarder acts on the Torque Converter, not the transmission.

The transmssions fitted to the trucks in the game don't have a torque convertor. iShift, ASTronic, Opticruise etc are electronically controlled range change and splitter transmissions.
Keyboard Cat Feb 8, 2013 @ 6:12pm 
Originally posted by bulwark5:
So I see an option to select which controls increase/decrease the retarder, but no not actually see how to engage it. :/ Am I missing something?

**Ok I guess I just need to upgrade my gearbox.

Yeah, you have to upgrade it, but even then there's no "on" switch or anything. You just hit the increase button to switch it into the first setting.
Trollgaard Nov 25, 2013 @ 2:10pm 
Here's a video. No marketing intended. It was just the video I used to figure out how the hell it works. http://www.youtube.com/watch?v=6O5p1gXdKto
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Date Posted: Feb 7, 2013 @ 5:20pm
Posts: 14