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#4722225 - 04/09/18 10:00 PM Using Cruise Control on Hils
Snagglefoot Offline


Registered: 12/31/17
Posts: 1269
Loc: Alberta
Since Bitgoers tend to take better care of their cars than most (normal) people, how many here prefer to take the car out of crise control on large hills where otherwise the car would get after it and drop a few gears to rev higher , on mine, sometimes to 4,000 RPM. When using the gas pedal I can accelerate up the hill just fine without dropping the gears. In my case I was doing 70 mph and it dropped a few gears and suddenly went from 2,100 to 4,000 rpm just to climb up the hill.


Edited by Snagglefoot (04/09/18 10:09 PM)

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#4722231 - 04/09/18 10:07 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
PimTac Offline


Registered: 03/04/17
Posts: 3441
Loc: Soviet State of Washington
On a typical freeway hill with light traffic I use the cruise until I sense the transmission is hunting gears then I go manual. Most mountain passes keep me manual but the long straight hills will have me in cruise control. On regular highways I stick to manual.
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#4722235 - 04/09/18 10:08 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
JHZR2 Offline



Registered: 12/14/02
Posts: 41403
Loc: New Jersey
I find that driving is much smoother and more efficient off cruise.

No need necessarily to keep full speed (conditions dependent), or necessarily such a severe downshift.

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#4722236 - 04/09/18 10:09 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
FordBroncoVWJeta Offline


Registered: 04/16/16
Posts: 710
Loc: KS
Originally Posted By: Snagglefoot
Since Bitgoers tend to take better care of their cars than most (normal) people, how many here prefer to take the car out of crise control on large hills where otherwise the car would get after it and drop a gear to rev higher , on mine, sometimes to 4,000 RPM. When using the gas pedal I can accelerate up the hill just fine without dropping the gear.
This is I hate automatics. This is why I try to purchase manuals.
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#4722241 - 04/09/18 10:13 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
Reddy45 Online   shocked


Registered: 08/15/08
Posts: 2720
Loc: USA
Cruise only on flat interstates now. On a previous vehicle, I used cruise too much on hilly trips and I think the OD band burned up as a result.

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#4722243 - 04/09/18 10:14 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
eyeofthetiger Offline


Registered: 11/18/17
Posts: 652
Loc: South Carolina
My cruise control car has a manual transmission. I take it out of cruise and downshift for steep hills. But for 99.9% of interstate highways, the only reason I have to take it out of cruise is the dang traffic.
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#4722246 - 04/09/18 10:17 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1269
Loc: Alberta
Donít know why the makers want the tranny to slam down and rev like crazy. Donít want to lug it but there has to be something in between. Are there trans kits to calm it down?

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#4722252 - 04/09/18 10:22 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
compratio10_5 Offline


Registered: 12/07/15
Posts: 74
Loc: Pocatello, Idaho
The replies here are right on. The most efficient way to drive for better mileage is to use constant throttle but since this results in going up hill slowly and down hill fast it is not safe and other drivers will hate you. Some newer vehicles are getting adaptive cruise control that will modify the speed setting depending upon the load and traffic but for the rest of us, shut off the cruise control in the mountains, on slick roads and in the heavy traffic.
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#4722253 - 04/09/18 10:23 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
eyeofthetiger Offline


Registered: 11/18/17
Posts: 652
Loc: South Carolina
Originally Posted By: Snagglefoot
Donít know why the makers want the tranny to slam down and rev like crazy. Donít want to lug it but there has to be something in between. Are there trans kits to calm it down?


It's the programming, and inability of the cruise to an anticipate the hill. By the time it realizes it's on a hill, it has already lost several MPH. So it has to accelerate hard to get back up to speed while climbing. I might compensate for that by giving it some gas right at the bottom of the hill so it never loses that speed.
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#4722256 - 04/09/18 10:24 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
Reddy45 Online   shocked


Registered: 08/15/08
Posts: 2720
Loc: USA
Originally Posted By: Snagglefoot
Donít know why the makers want the tranny to slam down and rev like crazy. Donít want to lug it but there has to be something in between. Are there trans kits to calm it down?


The PCM can't analyze the road ahead. Cruise control just tries to keep the speed at the set point.

If the terrain is hilly enough that it keeps dropping it a gear to catch up, you're better off modulating speed with your right foot.

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#4722271 - 04/09/18 10:43 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
Linctex Offline


Registered: 12/31/16
Posts: 5606
Loc: Waco, TX
Originally Posted By: Snagglefoot
When using the gas pedal I can accelerate up the hill just fine without dropping the gears. In my case I was doing 70 mph and it dropped a few gears and suddenly went from 2,100 to 4,000 rpm just to climb up the hill.


I love my 2008 F150, but I often feel the "cruise control software" was written by the biggest dunce in the industry.

I can easily climb many hills in this area (this is Texas "Hill country")
and it never drops out of OD/TQ lockup if I just feather the gas and allow it to drop 5 mph.

Letting the computer set the speed and ridiculous down-shifting on mild hills with cruise on is EXTREMELY annoying to me.
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#4722285 - 04/09/18 11:25 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
double vanos Offline


Registered: 08/05/04
Posts: 1813
Loc: 5600 feet elevation, Arizona
This is why I bought my Ď11 FX4 with Ecoboost engine and 3:73 gears. I takes one heck of a grade to make it even consider downshifting. I can gas up in Kerrville, Texas and drive to Fort Stockton 250 hilly miles away and it only shifts up to 6th once. Not one single downshift through the hill country and beyond. Torque rules.

Ecoboost engine + 3:73 gears = no downshifts.
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#4722289 - 04/09/18 11:29 PM Re: Using Cruise Control on Hils [Re: Reddy45]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1269
Loc: Alberta
Originally Posted By: Reddy45
Originally Posted By: Snagglefoot
Donít know why the makers want the tranny to slam down and rev like crazy. Donít want to lug it but there has to be something in between. Are there trans kits to calm it down?


The PCM can't analyze the road ahead. Cruise control just tries to keep the speed at the set point.

If the terrain is hilly enough that it keeps dropping it a gear to catch up, you're better off modulating speed with your right foot.


I now recall a trucker on this site told us his cruise control on his new Big Rig communicates with the truckís GPS and will accelerate prior to a hill if things are clear ahead,

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#4722290 - 04/09/18 11:29 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
NoNameJoe Online   content


Registered: 06/03/15
Posts: 348
Loc: New York
Quote:
Since Bitgoers tend to take better care of their cars than most (normal) people, how many here prefer to take the car out of crise control on large hills where otherwise the car would get after it and drop a few gears to rev higher , on mine, sometimes to 4,000 RPM. When using the gas pedal I can accelerate up the hill just fine without dropping the gears. In my case I was doing 70 mph and it dropped a few gears and suddenly went from 2,100 to 4,000 rpm just to climb up the hill.

I know exactly what you're talking about and I hate it too. The first time it happened to me, yeesh, never let it handle hills again, no thanks. I don't like the feeling.

AFAIK this is intentional and affects some cars when cruise control isn't used at all. For example on most Honda cars with AT's, if you're going down hill and you touch the brakes in a specific way, the AT drops gears shooting the RPM's up. Honda calls it "Grade Logic Control" where on hills it will try to detect them and either drop to lower gears, or maintain a lower gear entirely and never upshift, to make it easier to climb hills and also when descending hills to enhance engine braking.

On my last car, there was a hill on the commute where this would kick in consistently.

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#4722295 - 04/09/18 11:38 PM Re: Using Cruise Control on Hils [Re: Snagglefoot]
MNgopher Offline


Registered: 09/17/02
Posts: 3992
Loc: Lakeville, MN
I always love the complaints when the cruise control is doing exactly what it is intended to do - maintain a set speed, everything else be.. well you get the idea.

Yes, you can often do better than the cruise because you have the ability to react to stimuli that the cruise does not - namely you can see what is coming. The cruise only knows what has happened and what it needs to do to catch up or let off.

And the complaints that it downshifts even on smaller hills - high overdrive gearing will do that. Particularly with NA engines that tend to need to rev a bit produce their power... say a 5.0 V8 in the F150... Not a criticism of that package, just the reality of how it needs to be operated.

And I'll agree with a poster above - put an Ecoboost in the same truck, and you see a lot of those downshifts go away. Then we can debate running high boost at lower rpms, but that's another story...


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