What is this button? looks like dpf rejen override button or something, or is it for exhaust brake?
RamAirfreak98ss
- Status
I use it when towing and want to hold a specific speed on a down hill. As many of you know our engines and for that matter many diesels do not hold the speed on a down hill .... they just over rev. In gas engines computers can retard ignition or apply brakes (like our audi), but in diesels even if you stop sending fuel the engine just keeps on going.
So one of the ways to use the engine to stop the vehicle is to loose the compresión of the cilinder. ... this is nothing more than what we call a J-brakes. That way the engine works against itself and in turn slows you down.
Want to learn more ? Google has some neat diagrams on how the technology works ..... pretty neat if you ask me.
P
But, the correct answer ..... according to ford documentation ......
When the engine braking switch is selected, the engine
brake adjusts the vanes on the exhaust side of the
turbocharger to generate engine backpressure
– Extra braking power requires less manual
brake application from the driver, especially
on downhill grades
– Using the engine brake to slow the vehicle,
rather than applying the brakes, helps
reduce brake fade and brake lining wear
.... I stand corrected.... p
So one of the ways to use the engine to stop the vehicle is to loose the compresión of the cilinder. ... this is nothing more than what we call a J-brakes. That way the engine works against itself and in turn slows you down.
Want to learn more ? Google has some neat diagrams on how the technology works ..... pretty neat if you ask me.
P
But, the correct answer ..... according to ford documentation ......
When the engine braking switch is selected, the engine
brake adjusts the vanes on the exhaust side of the
turbocharger to generate engine backpressure
– Extra braking power requires less manual
brake application from the driver, especially
on downhill grades
– Using the engine brake to slow the vehicle,
rather than applying the brakes, helps
reduce brake fade and brake lining wear
.... I stand corrected.... p
It works by closing down turbo vanes to create back pressure when decelerating , most effective when tow haul is engaged keeping rpm up while slowing down.
Us 11-14' users don't have this option, so I built a towing mcc tune for H&S tuner devices that does the same thing, but more effective by closing vanes down more, and pair it with a more aggressive down shifting in tow haul mode.
Us 11-14' users don't have this option, so I built a towing mcc tune for H&S tuner devices that does the same thing, but more effective by closing vanes down more, and pair it with a more aggressive down shifting in tow haul mode.
It is an Exhaust Brake, Not an engine brake. It uses the vanes in the Turbo to restrict the airflow thru the engine. This creates back pressure that creates a braking effect .
The 2011-2014 trucks have a version of this built in. It's automatic, basically tied to the Tow/Haul button. In 2015 Ford increased the Turbo size which increased the braking effect and added the button so the driver could have some input into it's operation.
In the 2011-2014 trucks it works at a higher RPM because of the turbo size. It does work better and at lower RPMs in the 2015 and newer trucks.
Besides telling the turbo to restrict the flow of exhaust when no throttle is sensed. It also changes the programming of the torque converter/tranny to stay locked or engaged vs allowing free wheeling or coasting. So if you are shooting for the ultimate fuel mileage, You would want it turned off so you could coast as much as possible.
This product really works best at "Holding" a speed vs reducing speed. If you are coming down a 7% grade with a 13,000 lbs trailer behind you. You can run your speed up to 70 mph and touch your brakes to slow down to 60 mph and let it run back up to 70 mph causing wear on your brakes. OR you can engage your exhaust brake and set your cruise at 60 mph and let the truck hold that speed with out you ever touching your brakes. Your truck will hold a higher RPM to create the back pressure required for the braking.
But if you are going 70 mph and want to slow to 50 mph and push the button, It doesn't work really well.
The 2011-2014 trucks have a version of this built in. It's automatic, basically tied to the Tow/Haul button. In 2015 Ford increased the Turbo size which increased the braking effect and added the button so the driver could have some input into it's operation.
In the 2011-2014 trucks it works at a higher RPM because of the turbo size. It does work better and at lower RPMs in the 2015 and newer trucks.
Besides telling the turbo to restrict the flow of exhaust when no throttle is sensed. It also changes the programming of the torque converter/tranny to stay locked or engaged vs allowing free wheeling or coasting. So if you are shooting for the ultimate fuel mileage, You would want it turned off so you could coast as much as possible.
This product really works best at "Holding" a speed vs reducing speed. If you are coming down a 7% grade with a 13,000 lbs trailer behind you. You can run your speed up to 70 mph and touch your brakes to slow down to 60 mph and let it run back up to 70 mph causing wear on your brakes. OR you can engage your exhaust brake and set your cruise at 60 mph and let the truck hold that speed with out you ever touching your brakes. Your truck will hold a higher RPM to create the back pressure required for the braking.
But if you are going 70 mph and want to slow to 50 mph and push the button, It doesn't work really well.
Exhuast breaks are a very good tool, so are Jake breaks. Word of caution though: Please do not become reliant on the exhaust break to make you come to a stop. Also, in adverse weather conditions ( heavy rainfall, snow, sleet, icy roads ect.) Its in my own opinion that you do not use the exhaust break at all due to it can make you lose control and so on
Cheers.
Cheers.
These work "great", according to some?
About the weakest engine brake going, has to be. I can barely tell if it works or not. Sound doesn't change, and minimal hold back felt. And "minimal" is being kind.
One of the things I am disappointed with in this truck. My RAM's would almost put you through the windshield in comparison. And they also had a two stage program, one to hold a particular speed down hill, and the other to provide maximum braking effect.
MUCH better setup than this one, night and day difference, imo.
About the weakest engine brake going, has to be. I can barely tell if it works or not. Sound doesn't change, and minimal hold back felt. And "minimal" is being kind.
One of the things I am disappointed with in this truck. My RAM's would almost put you through the windshield in comparison. And they also had a two stage program, one to hold a particular speed down hill, and the other to provide maximum braking effect.
MUCH better setup than this one, night and day difference, imo.
Have you towed anything yet? Its not very effective empty at all, i also came from a Ram CTD and it was very strong hauling or empty and when test driving the ford it left me concerned at best.
The Fords only really works when you have brake input exceeding your rate of deceleration(truck is being pushed despite your braking input). Mine maintains and slows down my big car trailer just as well as the '14 CTD i had, actually does better since the transmission tuning is worlds better and its geared more aggressively keeping the RPM's up.
I feel its comparable to the CTD's exhaust brake when its in the auto mode, it will maintain speed down a hill but not slow the truck down w/o braking input like the full exhaust brake mode would on the CTD.
If Ram knew how to tune their trucks and build a transmission that wasnt complete garbage(68rfe) I'd probably still own mine, well, and the lack luster build/material quality also was a downer for me.
Jason
The Fords only really works when you have brake input exceeding your rate of deceleration(truck is being pushed despite your braking input). Mine maintains and slows down my big car trailer just as well as the '14 CTD i had, actually does better since the transmission tuning is worlds better and its geared more aggressively keeping the RPM's up.
I feel its comparable to the CTD's exhaust brake when its in the auto mode, it will maintain speed down a hill but not slow the truck down w/o braking input like the full exhaust brake mode would on the CTD.
If Ram knew how to tune their trucks and build a transmission that wasnt complete garbage(68rfe) I'd probably still own mine, well, and the lack luster build/material quality also was a downer for me.
Jason
It does work pretty good once the rpm's are up. If you don't think it does anything the next time your slowing down on the highway, click it on then downshift 1 gear and watch the boost gauge. Then downshift again and it will build even more. My 15 will read over 10lbs once it is up over 2000rpm and you can definitely feel it braking. Haven't towed with it yet but have heard it is even better with a load and tow haul engaged.
I use mine only when i hook up my 5th wheel. I see no need unloaded. Same with tow haul mode. Only use it when pulling my trailer in town or in the mountains not so much on the highway. The exhaust brake works nice when hooked up to the trailer and it is noticeable when going down hill. There is something in the truck that tells the truck the percentage of slope the truck is in to maximize braking.
Yes I've had my work trailer on behind. Baby loads so far, no more than 6k.
Notice it's more effective when rpm is up.
Might just be something I need to get used to. The CTD was better both empty and loaded, imo.
Notice it's more effective when rpm is up.
Might just be something I need to get used to. The CTD was better both empty and loaded, imo.
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