GEN 2 Engine Braking in Slippery Mode

[Braaaaptor]

Just curious, would “Hill Descent Control” work in this situation?

Hill descent control turns off @20mph which is coincidentally where cruise control begins

 

[Lion74]

Hill descent control turns off @20mph which is coincidentally where cruise control begins

Yeah, wasn’t sure how fast 3M @4500 rpm would get you.

 

[GordoJay]

Yeah, wasn’t sure how fast 3M @4500 rpm would get you.

My math says 52 and change. That matches pretty well with my memory.

 

[TurboTJ]

My S.W.A.G. is this is controlled through the torque converter and is relative to throttle position and other speed sensors. This is done mostly for fuel economy but I can see where it would help in slippery conditions.

It used to be that the engine would shutoff all fuel during engine braking. On my Turbocharged Jeep Wrangler TJ, I would see 1600F EGT’s climbing the pass and 250F on the way back down. Warped 3 exhaust manifolds doing this.

 

[TurboTJ]

Engine braking can be effected by fueling and ignition timing. Very common on four stroke mx bikes were the throttle is still mechanical with no electronic over ride. When the big 450 four stroke craze happened, compression braking was a big rider complaint. Everyone was use to 250 two strokes that didn't have any compression braking.
I doubt Ford would hold open the throttle plate but they could add air thru the idle air control motor.

That’s an interesting idea. Pure engine braking should not involve any fuel injection so timing wouldn’t do anything but who knows these days. I could see them injecting some fuel to keep the engine warm on long grades in the cold.

I never considered using the IAC motor but that’s possible. Anything that reduces vacuum in the intake manifold will reduce engine braking.

 

[TurboTJ]

I think it’s pretty much unnecessary, too. We’ve gotten some snow and traction control is so good in 2wd, normal mode that it’s crazy.

I used to feel this way but RA made me appreciate the modes. Makes it really easy to throw the keys to my girlfriend without having to explain when to use 4H. Snow = slippery mode.

I’ve noticed it numbs the throttle. Shifts feel smoother too in order to not break traction. I’m guessing it also changes stability parameters and traction control a bit. Maybe @FordTechOne knows more.

 

[GordoJay]

I used to feel this way but RA made me appreciate the modes. Makes it really easy to throw the keys to my girlfriend without having to explain when to use 4H. Snow = slippery mode.

I’ve noticed it numbs the throttle. Shifts feel smoother too in order to not break traction. I’m guessing it also changes stability parameters and traction control a bit. Maybe @FordTechOne knows more.

The modes work, no question. I've trained my tranny to shift smoothly in normal mode. I've driven a lot of miles on snow with 2WD and no traction control whatsoever, so I know how to keep my foot out of it. I'm very impressed with 2H Normal in the snow. It's better than 4WD from 20 years ago unless it's so steep and slippery that you need the extra traction to go uphill. Compared to 2WD from 60 years ago? It's flat fricking unreal. Slippery mode is just icing on the cake. The cake is damn good without it.