F150 dangerous tow haul mode
07-22-2019, 09:54 AM
#21
c
My 5.0 does almost exactly like this but turns a bit more rpm when engine braking. The system is fantastic on my truck. IMO you need a new Service Advisor. I'd ask him to please put his advice in writing because it's so stupid nobody will ever believe he actually gave it.
Just did 1500+ miles with a 7k TT in the Smokies. Declines reached 5%. I found the engine braking was directly proportionate to my braking(speed decrease) and worked well. The more braking I did to reduce speed, the further the engine downshifted. I dont remember it ever getting the engine above about 4500RPM, and that was only once or twice. I believe 4th was the lowest gear it dropped to. It felt like it worked as designed and saved me a lot of time riding the brakes. The tranny temps never went above 206. I have a 17 with a 10spd 3.5EB. I did have the transmission reflashed for 1-3 hard shift. Not sure if there was something else in the program.
07-22-2019, 10:56 AM
#22
Senior Member
That is what I ended up doing. I normally lock out 10th and sometimes 9th gear. After switching back to normal shift mode on descent I found the trans would maintain a higher gear / lower revs.
07-22-2019, 11:46 AM
#23
Was your foot on the brakes the whole time? I've noticed in tow/haul that the engine braking only kicks on when the brakes are applied, then it will upshift after you let off and apply the gas for a few seconds. Tapping the throttle may not be enough to unlock the engine brake mode.
I don't use tow haul most of the time, way to much slip allowed and the braking is erratic with the aggressive down shifts. I don't need the torque multiplication so lock the TC up sooner and back the engine braking down a hair and it might be useable.
I don't use tow haul most of the time, way to much slip allowed and the braking is erratic with the aggressive down shifts. I don't need the torque multiplication so lock the TC up sooner and back the engine braking down a hair and it might be useable.
This is exactly what T/H mode does! There is a menu setting to adjust how aggressive the engine braking is under trailer settings. I found this out towing my little enclosed trailer with no brakes. By changing the settings I found it downshifts quicker when braking which is helpful for curves.
07-22-2019, 11:52 AM
#24
Senile member
This is exactly what T/H mode does! There is a menu setting to adjust how aggressive the engine braking is under trailer settings. I found this out towing my little enclosed trailer with no brakes. By changing the settings I found it downshifts quicker when braking which is helpful for curves.
07-22-2019, 12:03 PM
#26
No, it is for engine braking sensitivity, the trailer brake settings are done with the gain on the TBC. My small enclosed does not have trailer brakes and I did adjust the brake settings and found a difference in how it reacts when braking. I'm sure it will apply more trailer braking depending on the settings, but works for trailers without brakes as well.
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HBS (07-25-2019)
07-22-2019, 01:20 PM
#27
I suggest guys try adjusting the braking force to min and max and see what you think. Not gain, but brake force setting. It is a great feature when working correctly.
07-22-2019, 01:20 PM
#28
I will check under settings and see if I can find that.........I quit using t/h mode because mine would start downshifting without foot on the brakes.and most of my towing is in the ozarks 60mph to 30 two lane roads.
07-22-2019, 01:27 PM
#29
Registered User
iTrader: (2)
No, it is for engine braking sensitivity, the trailer brake settings are done with the gain on the TBC. My small enclosed does not have trailer brakes and I did adjust the brake settings and found a difference in how it reacts when braking. I'm sure it will apply more trailer braking depending on the settings, but works for trailers without brakes as well.
07-22-2019, 03:10 PM
#30
2.7L and 3.5L are small air pumps compared to 5.0 and the long used 5.4L Just saying.......not going to have nearly as much effect