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parkesjg 01-10-2014 02:17 PM

ACC Question
 
I've searched but didn't find a definitive answer to my question. Apologize if the answer is out there somewhere.

I'm very interested in the ACC on the GC but cant find out if the systems is the same as it is in the new Cherokee (i.e. Stop AND Go). My understanding is that it is simply 'Stop' and will disengage after about three seconds or so. Can any confirm if the newer version (the Stop version) is the same as the new Cherokee, and if not - will it be upgraded to the newer version and when.

Thanks in advance.

14SummitHemi 01-10-2014 02:51 PM

Re: ACC Question
 
I am not familiar with the nuance but I am pretty sure it's the new version...In my 2014 5.7l/4x4 Summit (build 11/3) the ACC is absolutely amazing. Set it and it does it's job to a tee. It seems to decel via gas off, decel via braking, decel via tranny downshift, resume as firmly and comfortably as it can/should...It definitely stops AND goes.
Scenario 1 (Highway)...you have it set for 72 in high speed lane (don't laugh, it's Ohio) and racer rick comes up behind so you move right (always into slower traffic) and ACC slows you down to keep desired distance and will hold until spacing changes like when you decide to go back left and as soon as you slightly give left wheel input it picks up firmly but smoothly (no crazy tranny kickdowns) and either goes to set max speed or the max it can do to maintain spacing. If someone lane jumps in front of you ACC will act accordingly. Once is strongly applied brakes to get from 67 to like 50 in a heartbeat until the jerko when and terrorized someone else.
Scenario 2 (local 35mph road with lots of residential cross streets)...all of the above but I was unsure of it's skill and preciseness first time so I covered the brake with my foot and the ACC basically said, "Whatchya worried about Willis?" Just cruising along at 42mph (ACC setting and 3 car lengths) and the guy in front of me decided without warning to pull a "right turn Clyde!" The ACC aggresively applied brakes and got me down to about 23 and just as I was about to bail on the ACC and either swerve left or hammer the brakes the guy continues his turn and the ACC knew based on increasing (very slight) rate of separation that I was ok and it actually firmly picked speed back up....very impressive!

Does this answer the question?

2012 Summit 01-10-2014 04:34 PM

Re: ACC Question
 
Quote:

Originally Posted by 14SummitHemi (Post 957685)
I am not familiar with the nuance but I am pretty sure it's the new version...In my 2014 5.7l/4x4 Summit (build 11/3) the ACC is absolutely amazing. Set it and it does it's job to a tee. It seems to decel via gas off, decel via braking, decel via tranny downshift, resume as firmly and comfortably as it can/should...It definitely stops AND goes.
Scenario 1 (Highway)...you have it set for 72 in high speed lane (don't laugh, it's Ohio) and racer rick comes up behind so you move right (always into slower traffic) and ACC slows you down to keep desired distance and will hold until spacing changes like when you decide to go back left and as soon as you slightly give left wheel input it picks up firmly but smoothly (no crazy tranny kickdowns) and either goes to set max speed or the max it can do to maintain spacing. If someone lane jumps in front of you ACC will act accordingly. Once is strongly applied brakes to get from 67 to like 50 in a heartbeat until the jerko when and terrorized someone else.
Scenario 2 (local 35mph road with lots of residential cross streets)...all of the above but I was unsure of it's skill and preciseness first time so I covered the brake with my foot and the ACC basically said, "Whatchya worried about Willis?" Just cruising along at 42mph (ACC setting and 3 car lengths) and the guy in front of me decided without warning to pull a "right turn Clyde!" The ACC aggresively applied brakes and got e down to about 23 and just as I was about to bail on the ACC and either swerve left of hammer the breaks the guys continues his turn and the ACC knew based on increasing (very slight) rate of separation that I was ok and it actually firmly picked speed back up....very impressive!

Does this answer the question?

Good information, but does it "Stop AND Go"

Shannon 01-10-2014 04:54 PM

Re: ACC Question
 
Quote:

Originally Posted by 2012 Summit (Post 957740)
Good information, but does it "Stop AND Go"

Yes. When you stop, if the car in front doesn't move within about 2-3 seconds, it asks you to put the brake on. If you put the brake on, you have to press "resume" to go. If the car in front moves within the 2-3 seconds, it automatically starts.

2012 Summit 01-10-2014 05:58 PM

Re: ACC Question
 
Quote:

Originally Posted by Shannon (Post 957778)
Yes. When you stop, if the car in front doesn't move within about 2-3 seconds, it asks you to put the brake on. If you put the brake on, you have to press "resume" to go. If the car in front moves within the 2-3 seconds, it automatically starts.

Thanks. So is it considered stop and go or simply stop?

netboy 01-10-2014 06:21 PM

Re: ACC Question
 
Quote:

Originally Posted by 2012 Summit (Post 957826)
Thanks. So is it considered stop and go or simply stop?

As Shannon explained it is "stop and go". Earlier 2014 JGC's had the stop only where once the vehicle comes to a full stop ACC disengages. Later models have the "Stop and Go" where ACC will bring the car to a full stop and will resume movement of the vehicle once the car in front starts moving again. It will simply not wait for a movement forever and will disengage if no movement is detected after a couple of seconds of complete stop so it's not your traffic jam helper but definitely handles stop and go traffic.

2012 Summit 01-10-2014 06:55 PM

Re: ACC Question
 
Quote:

Originally Posted by netboy (Post 957837)
As Shannon explained it is "stop and go". Earlier 2014 JGC's had the stop only where once the vehicle comes to a full stop ACC disengages. Later models have the "Stop and Go" where ACC will bring the car to a full stop and will resume movement of the vehicle once the car in front starts moving again. It will simply not wait for a movement forever and will disengage if no movement is detected after a couple of seconds of complete stop so it's not your traffic jam helper but definitely handles stop and go traffic.

Thanks, netboy. I was confused (happens often) by the OP who stated "My understanding is that it is simply 'Stop' and will disengage after about three seconds or so."

My ACC dates way back to the plain jane version :)

silvermax04 01-10-2014 07:09 PM

Re: ACC Question
 
Quote:

Originally Posted by netboy (Post 957837)
As Shannon explained it is "stop and go". Earlier 2014 JGC's had the stop only where once the vehicle comes to a full stop ACC disengages. Later models have the "Stop and Go" where ACC will bring the car to a full stop and will resume movement of the vehicle once the car in front starts moving again. It will simply not wait for a movement forever and will disengage if no movement is detected after a couple of seconds of complete stop so it's not your traffic jam helper but definitely handles stop and go traffic.

I wish the early models stopped completely but they don't. If you have a model built before late July the ACC shuts off when the speed of the Jeep drops to 15 mph and below. So if you are buying off the lot check those build dates and make sure they are august or later.

14SummitHemi 01-10-2014 07:32 PM

Thx for the info folks. The owners guide and manual are woefully thin on details like this. Didn't know the ACC was this comprehensive. Got some more learning to do it seems in traffic..cool

crabman 01-10-2014 07:42 PM

Re: ACC Question
 
I wouldn't call it stop and go because you get a couple seconds grace. Stop and go is stop and go, stop and go on the rare occasion where the complete stop is less than three seconds should be called stop and you will rarely go. Or stop and you might on the odd occasion go. Or stop and every once in a while you will go. Or stop and...

2012 Summit 01-11-2014 07:51 AM

Re: ACC Question
 
Quote:

Originally Posted by crabman (Post 957861)
I wouldn't call it stop and go because you get a couple seconds grace. Stop and go is stop and go, stop and go on the rare occasion where the complete stop is less than three seconds should be called stop and you will rarely go. Or stop and you might on the odd occasion go. Or stop and every once in a while you will go. Or stop and...

Apparently Jeep agrees with you as they officially call it " ACC with Stop system"

BMW offers what they refer to as stop and go. I wonder if it's true stop and go?

crabman 01-11-2014 09:23 AM

Re: ACC Question
 
Its a little different. You still have the 3 second window after a complete stop where it will take off on its own but after that you have to tap the accelerator or it wont move. I think you can also push the stalk but I cant remember. It was the ol ladies car and I seldom drive her cars. So a little more automatic but you must still intervene.


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