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  #61  
Old 07-21-2016, 03:07 PM
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Re: Paddle Shifters (slowing down)

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Originally Posted by schmieg View Post
... On the highway, I use the adaptive cruise to maintain my speed going downhill. In town, I use the brakes.
Does the ACC downshift or brake or both?

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  #62  
Old 07-21-2016, 04:01 PM
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Re: Paddle Shifters (slowing down)

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Originally Posted by Snipe315 View Post
I love using the paddle shifters to slow down during a steep descent.

And if these vehicles are so poorly designed that intermittent use of engine braking and/or transmission shifts would damage the transmission, then we should ALL be worried about the quality (or lack thereof) of these Jeeps.
On really steep downgrades, you can heat up brakes enough that they start stinking... but with a mere drop into sport mode and a click of a paddle, you can avoid overheating the brakes. e.g. Many of the more interesting Colorado roads, Sonora Pass [108] crossing the Sierra, etc.

Using them to slow the vehicle abruptly rather than brakes is probably best used for "smokey situations" at night--as otherwise the brilliant driver behind you may not notice you are slowing quickly.
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  #63  
Old 07-21-2016, 04:09 PM
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Re: Paddle Shifters (slowing down)

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Originally Posted by BubbaATL View Post
Does the ACC downshift or brake or both?
Both. Actually, when you have the ACC, even the regular cruise control will do that going downhill to maintain the set speed.
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Old 07-21-2016, 04:11 PM
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Re: Paddle Shifters (slowing down)

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Originally Posted by schmieg View Post
Both. Actually, when you have the ACC, even the regular cruise control will do that going downhill to maintain the set speed.
Hmmm. Would be useful to know more about that. I wouldn't want my ACC riding my brakes down a long steep incline any more than I'd want my foot doing it.
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  #65  
Old 07-21-2016, 04:25 PM
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Re: Paddle Shifters (slowing down)

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Originally Posted by BubbaATL View Post
Hmmm. Would be useful to know more about that. I wouldn't want my ACC riding my brakes down a long steep incline any more than I'd want my foot doing it.
It doesn't seem to do that. It tends to use the engine first and then brake on and off to maintain speed. That being said, I've never noticed a high rev on the downshifting though I have noticed it downshifting on long hills.
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  #66  
Old 07-22-2016, 12:11 PM
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Quote:
Originally Posted by schmieg View Post
Both. Actually, when you have the ACC, even the regular cruise control will do that going downhill to maintain the set speed.
My cruise control will downshift to maintain set speed and I don't have ACC.
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Old 07-22-2016, 12:53 PM
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Re: Paddle Shifters (slowing down)

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Originally Posted by RottenDiesel View Post
My cruise control will downshift to maintain set speed and I don't have ACC.
Interesting. I know a year or so ago, someone was complaining about the ACC doing this because they wanted to gain speed when they went downhill. As part of the discussion, I seem to remember someone saying that the non-ACC vehicles didn't have the speed maintenance feature when going downhill.

I personally don't know. I just know that the GC with ACC as of 2014 will maintain speed in both ACC and normal CC when going down hill.
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Old 07-22-2016, 01:26 PM
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Re: Paddle Shifters (slowing down)

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Originally Posted by schmieg View Post
As part of the discussion, I seem to remember someone saying that the non-ACC vehicles didn't have the speed maintenance feature when going downhill.
Maybe it's because I have the EcoDiesel, but mine definitely does this. It scared the crap out of me the first time it happened because I wasn't expecting it.
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Old 07-22-2016, 01:29 PM
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Re: Paddle Shifters (slowing down)

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Originally Posted by RottenDiesel View Post
Maybe it's because I have the EcoDiesel, but mine definitely does this. It scared the crap out of me the first time it happened because I wasn't expecting it.
Actually, I wasn't expecting it on the normal CC the first time it happened on mine. My brother-in-law has an M3 and his does it, but I thought it was confined to the ACC on the Jeep.
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Old 07-23-2016, 10:28 AM
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Re: Paddle Shifters (slowing down)

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Originally Posted by schmieg View Post
Interesting. I know a year or so ago, someone was complaining about the ACC doing this because they wanted to gain speed when they went downhill. As part of the discussion, I seem to remember someone saying that the non-ACC vehicles didn't have the speed maintenance feature when going downhill.
That would defeat part of the reason for having CC if it couldn't maintain speed properly.

On my non-ACC Jeep, it absolutely uses engine braking to maintain speed going down hill.

In fact, even without CC being active, it will occasionally use a lower gear if it senses it's gaining speed on a downhill descent when I let off the gas.
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  #71  
Old 07-23-2016, 10:38 AM
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Re: Paddle Shifters (slowing down)

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Originally Posted by NetworkTV View Post
That would defeat part of the reason for having CC if it couldn't maintain speed properly.

On my non-ACC Jeep, it absolutely uses engine braking to maintain speed going down hill.

In fact, even without CC being active, it will occasionally use a lower gear if it senses it's gaining speed on a downhill descent when I let off the gas.
Older CC systems would use engine braking by easing up on the throttle, but on steep hills, the vehicle would often still accelerate. Those systems didn't downshift or use the brakes to maintain the set speed. Even today, many don't.
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  #72  
Old 07-23-2016, 12:04 PM
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Re: Paddle Shifters (slowing down)

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Originally Posted by schmieg View Post
Older CC systems would use engine braking by easing up on the throttle, but on steep hills, the vehicle would often still accelerate. Those systems didn't downshift or use the brakes to maintain the set speed. Even today, many don't.
On any hills I've been down, the vehicle has easily held itself at proper speed.

Granted, I haven't been down any crazy steep grades like Pike's Peak or similar, but I also wouldn't dare be in cruise control on something that steep anyway.

Instead, I would use the paddles to allow engine braking to supplement any necessary applications of regular brakes. That should create the best compromise between avoiding excessive RPMs and overheating the brakes.
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