2020 Cummins IKE pull

4x4ord wrote:

Bionic Man wrote:
The 2020 RAM owners manual is here.

The towing section looks to start at 318. The exhaust brake section is on 230.

I don't see anything that talks about applying brakes when the EB is on, nor applying the brake lights. But I didn't read the whole thing.

I think the idea of all the electronics is to make the trucks simple to operate. Just put it in drive, push the auto EB button and go. The danger of explaining things in the owner's manual is that, unless things are explained to great length, it might confuse more people than it helps. Some would read that the auto button will apply wheel brakes on the down hill grade and think using auto could overheat their brakes. Auto is designed to be used not avoided.


Edit: I looked in my Ford owners manual and like the Ram manual, it says nothing about the Auto EB mode controlling the brake lights or wheel brakes.

I have thought for years the EB should activate the brake lights. I have warned people on group camping trips to be aware that I can slow without brake lights coming on.

NOW, applying the brakes, is something I would not want to occur, or at least provide a setting where one can turn the feature off.

The whole "thing" about having an EB is to have nice cool service brakes available in emergencies. Chris

Me Again wrote:

Cummins12V98 wrote:
Like I said no one really knows how much fuel these trucks use. FISH what you say now?

So as 4x4ord mentions the 10 speed would have not made any difference. Did y'all see how cool the trans runs? YUP just like mine nice and cool.

Did y'all see how well the truck keeps the truck at speed downhill with the cruise on as I have mentioned many times? Heck I was holding 35mph at 14% in second for miles at 33k combined.

Rear air heck yea I know how well it works and yes my 15's steering is like being on rails unloaded and at full RAWR of 9,750# with a combined 35k.

SAE Towing capacity is 3k higher than the other two.

So bottom line I will gladly take a truck that is a bit slower up the hill with a "True Medium Duty" engine and transmission that will do this day after day and WILL get me down the grade with ZERO brake applications and the BEST part COLD brakes!

Did you notice the rear leafs of the factory air ride were different from yours? Chris

Yes. They have been for a while.

As mentioned. I run Full RAWR and rock solid.

Cummins12V98 wrote:
"Cummins: you need 382 reverse HP at the rear wheels of your truck to keep your 33k lb combined unit from accelerating on a 14% grade at 35 mph."

Something does not jive! I was locked in 2nd right against the redline or close to it. You had mentioned that section varied in grade as does the Ike. Who knows, I just know it did what it did.

Makes ya wonder how accurate these signs are????

Makes me wonder if the computer isn't programmed to apply wheel brakes at the engine red line to prevent over revving the engine.

Bionic Man wrote:
The 2020 RAM owners manual is here.

The towing section looks to start at 318. The exhaust brake section is on 230.

I don't see anything that talks about applying brakes when the EB is on, nor applying the brake lights. But I didn't read the whole thing.

I think the idea of all the electronics is to make the trucks simple to operate. Just put it in drive, push the auto EB button and go. The danger of explaining things in the owner's manual is that, unless things are explained to great length, it might confuse more people than it helps. Some would read that the auto button will apply wheel brakes on the down hill grade and think using auto could overheat their brakes. Auto is designed to be used not avoided.


Edit: I looked in my Ford owners manual and like the Ram manual, it says nothing about the Auto EB mode controlling the brake lights or wheel brakes.

Cummins12V98 wrote:
Like I said no one really knows how much fuel these trucks use. FISH what you say now?

So as 4x4ord mentions the 10 speed would have not made any difference. Did y'all see how cool the trans runs? YUP just like mine nice and cool.

Did y'all see how well the truck keeps the truck at speed downhill with the cruise on as I have mentioned many times? Heck I was holding 35mph at 14% in second for miles at 33k combined.

Rear air heck yea I know how well it works and yes my 15's steering is like being on rails unloaded and at full RAWR of 9,750# with a combined 35k.

SAE Towing capacity is 3k higher than the other two.

So bottom line I will gladly take a truck that is a bit slower up the hill with a "True Medium Duty" engine and transmission that will do this day after day and WILL get me down the grade with ZERO brake applications and the BEST part COLD brakes!

Did you notice the rear leafs of the factory air ride were different from yours? Chris

The 2020 RAM owners manual is here.

The towing section looks to start at 318. The exhaust brake section is on 230.

I don't see anything that talks about applying brakes when the EB is on, nor applying the brake lights. But I didn't read the whole thing.

"Cummins: you need 382 reverse HP at the rear wheels of your truck to keep your 33k lb combined unit from accelerating on a 14% grade at 35 mph."

Something does not jive! I was locked in 2nd right against the redline or close to it. You had mentioned that section varied in grade as does the Ike. Who knows, I just know it did what it did.

Makes ya wonder how accurate these signs are????

Since no one responded to my question about when the CUMMINS was at 3,500rpm I will answer it my self. I watched the entire downhill and the MAX rpm it was turning was 3,250 right against the redline.

CaLBaR wrote:

4x4ord wrote:
With the Ford the brake lights only come while the wheel brakes are applied. The Ram is probably the same.

In my owners manual it states that the brake lights come on when the exhaust brake is active letting other drivers know that you are slowing down.

Rob

This must be new for 2019?

Does it say anything about actually applying the truck or trailer brakes when EB is active?

I did an experiment with my Ford and determined that the Ford exhaust brake will produce about 170 reverse HP at the rear wheels (at 3500 engine rpm) ... likely about 145 at the crankshaft. Without the exhaust brake turned on the engine will produce about 62 negative HP. Drag and rolling resistance at 50 mph on a typical truck and 5ver is likely equivalent to about 80 negative HP. So the total resistance on my truck and trailer with the exhaust brake working at maximum capacity is about 250 negative HP at 50 mph. My 24000 lb truck/trailer on a 7% grade needs about 225 negative HP to hold it from accelerating.

Based on what I have experienced towing in the mountains the above seems about right. It takes an 8% grade before I will see may wheel brakes applied to supplement the exhaust brake.

Edit: Cummins: you need 382 reverse HP at the rear wheels of your truck to keep your 33k lb combined unit from accelerating on a 14% grade at 35 mph.