Series 60 dual power (370/430 or 430/470) -- how does it work?

They aren't.

There's your clue. Does it make a difference using the 1-2-3 switch? For example going from 2 to 3, do you notice a difference? If not it's likely one of your jakes is going out, or one of the wires. If there is a difference it could be the wastegate on your turbo.

Jakes are simple mechanical devices. They're either on or off. Nothing in the ECM changes that. The ECM does not control the wastegate on a 2000 detroit either. It's not in the programming.

This one could be an ECM setting, but I'm not sure. I have the program for detroit.

Is this with the cruise on or off?

When was the last time you went for an overhead?

 

there are 21 different settings in the ECM which change that.

 

I took a 700 mile dispatch today. Wasn't really worried about fuel mileage, obviously. Figured I could push the motor and experiment since I wasn't concerned about fuel today.

So on a good pull I dropped it to 7 low and got over 400 horsepower at 1800 rpm I think, wasn't really watching the tac. You gotta stay above 1500 rpm to open up those extra ponies from my experience today.

 

And do any of these affect the strength of the brake? No they do not. Those setttings affect when the jake comes on, not how strong it is.

The settings for cruise on jake performance can be changed in diagnostic link, but it still seems like there's other issues. The wastegate should only open around 28 psi IIRC.

The fact that the jake was installed as a retrofit does change things however. Did the truck have a jake before?

There is torque limiting in the detroit software, but I'm unsure if it affects the jake because the jake is always weaker than engine power.

 

Also do you have an aftermarket turbo on this thing.

 

there's two wires, but three jake settings. setting 1 is 2 cylinders, setting 2 is 4 cylinders and both together is 6. There should be a 1-2-3 switch and an on switch. The ECM sees two jake brake wires from your dash switches. 1-0 is setting 1, 0-1 is setting 2 1-1 is setting 3.

Here is all the ECM settings I could find in DCT. DCT is not DDDL, it is what is actually used to program the ECM. DDDL is used for diagnostics and changing some settings such as rating.



note: Did they flash the ECM or just change the power setting? Big difference here. If they just changed the rating in DDDL there is zero difference in jake programming. The majority of the DDC programming is used in a shared folder, when you change the rating in DDDL it only changes a few tables, none related to jake performance. But if they flashed the ECM that changes everything.

So let's go through every jake related setting that I think is relevant:

Digital inputs - these are the wires going from your dash to your ECM that tells the ECM you want jakes.

jake_brake_min_mph - This might be set at 35 incorrectly. I see no reason it shouldn't be 0. Keep in mind this is on/off, not strength of the jake.

Jake_hi_delta_mph
Jake_lo_delta_mph
Jake_med_delta_mph

These could all be related to the cruise issue you were talking about. These are only used with cruise control. As you can see on mine, low comes in at 3 mph above cruise, med at 4 mph above cruise, and hi at 5 mph above cruise.

I do not think any of the other settings should affect you. I will have a look at DDDL later today on my truck (you have to be hooked up) but the reality is everything in DDDL can be changed with DCT, it's just more user friendly.

 

Also you can run down the highway with DDDL attached and see what the ECM is doing. You can also see which switches are activated.