Jerky Cruise Control?

[Doel]

Service scheduled for next Tuesday so I can take a drive with a service tech while he records a datalog. They are also going to have KIA log in remotely to watch/view the data. I fully expect all parties involved to tell me there's nothing wrong with my CC..

let us know how it goes!

 

[JeffAsfbay]

Service scheduled for next Tuesday so I can take a drive with a service tech while he records a datalog. They are also going to have KIA log in remotely to watch/view the data. I fully expect all parties involved to tell me there's nothing wrong with my CC..

By all means, please post the results here - I'll be very interested to see what happens (unfortunately I tend to agree with your anticipated outcome).

 

[MikeysGT]

By all means, please post the results here - I'll be very interested to see what happens (unfortunately I tend to agree with your anticipated outcome).

I'll be sure you let you all know what comes of it next week. I am anxious with anticipation for this epic non turn of events about to happen. lol

 

[QuantumPion]

I'm a new stinger owner (2019) and I was looking forward to using the advanced cruise control for stop & go traffic. However it made me car sick immediately. The car waits until way too late to slow down and then practically slams on the brakes. I'm concerned about getting rear ended in addition to barfing. At-speed cruise control seems to work fine, though I haven't used it much or on hills yet to notice the surging problem people are describing.

 

[Collybus]

So anyone who has a Subaru w/EyeSight and ALSO a Stinger, I'd be very grateful for any real-world differences anyone could describe.

I have had a 2018 Subaru Legacy for about a year, and recently bought a 2018 Stinger Premium as a second car. I only have 1500 miles on the Stinger, so I can't speak with authority about it's camera / radar system, but while noticing differences between the two cars, I have no complaints about the Stinger adaptive CC.

I'm a big fan of adaptive CC and use the system a lot in both cars. Subaru's Eyesight system works very well and I find it's only real flaw is a lag in accelerating after a vehicle in front has moved out of my lane. However, it's Lane Assist system sucks and I never use it; it makes the car pinball between the travel lane and I'm sure to other drivers it looks like I'm drunk. The Stinger's Lane Assist is far better, with almost no wandering within the lane.

I haven't found fault with the Stinger's adaptive CC system, except sometimes it is a little late in braking, and it can take an act of faith to let it continue to drive itself when it seems like you're about to slam into the car in front of you. But so far it has stopped in time. Between a very smooth Lane Assist system and a smooth and reliably smart CC, I find driving on the highway to be a real joy in the Stinger, and I like it more than the Subaru's Eyesight system, by more than a little bit.

Oh, one other small thing; in the Subaru, when the car comes to a stop, you have to press the accelerator or flick the crusie set switch to get the car moving again; in the Stinger, it gives you a few seconds of complete stop before that becomes necessary, so that in stop-and-go conditions, the Stinger will actually stop and go on its own.

 

[Ucinn]

My yellow GT was quite a bit more noticeable than this ceramic GT2 I have now. I just took the GT2 on a 400 mile trip and only noticed it once going up a pretty big hill. Even trying to notice it on flats and downhills, I couldn't notice it. Seems to be different from car to car.

 

[Doel]

I'm a new stinger owner (2019) and I was looking forward to using the advanced cruise control for stop & go traffic. However it made me car sick immediately. The car waits until way too late to slow down and then practically slams on the brakes. I'm concerned about getting rear ended in addition to barfing. At-speed cruise control seems to work fine, though I haven't used it much or on hills yet to notice the surging problem people are describing.

what distance setting do you have the adaptive cruise control set to?

 

[Ucinn]

I tried mine once at the longest distance and it worked fine..didn't slow down fast nor accelerate back to speed too fast. I just don't like it and use the regular cruise. It would be perfect for following someone somewhere.

 

[Grayt 8]

I'm a new stinger owner (2019) and I was looking forward to using the advanced cruise control for stop & go traffic. However it made me car sick immediately. The car waits until way too late to slow down and then practically slams on the brakes. I'm concerned about getting rear ended in addition to barfing. At-speed cruise control seems to work fine, though I haven't used it much or on hills yet to notice the surging problem people are describing.

Have you tried adjusting the sensitivity of the SCC?

 

[JeffAsfbay]

I'm a new stinger owner (2019) and I was looking forward to using the advanced cruise control for stop & go traffic. However it made me car sick immediately. The car waits until way too late to slow down and then practically slams on the brakes. I'm concerned about getting rear ended in addition to barfing. At-speed cruise control seems to work fine, though I haven't used it much or on hills yet to notice the surging problem people are describing.

I'm sorry to hear about this. I have a question about the circumstances in which the car waits too long to slow down.
1. Does this happen every time?
2. Does the adaptive cruise control (ACC) show when it has acquired a car in front of you? If so, have you noticed whether the icon for the lead car is there in situations when the car waits too long and then has to put the brakes on hard?

I ask because with EyeSight in my 2015 Outback, if the Outback has not sensed (and displayed the icon for) a lead car in front of me, the Outback will also wait too long to slow down. The primary example of this case is on a 45 mph "Expressway" with traffic lights. If the ACC doesn't have a lead car detected, and at 45 mph, I come upon a group of stopped cars, EyeSight doesn't seem to detect the lead car. It might eventually, but so far I haven't had the nerve to wait and see, so I put on the brakes myself. If however my car *does* show a lead car (an icon on the adaptive cruise control display), then it will always slow down in plenty of time at a nice reasonably slow rate of deceleration.

When I test drove a 2018 Camry early this year, it seemed to have the same problem detecting a lead car, but the problem was made worse by the Camry because after acquiring a lead car, it would frequently lose it (because maybe it changed out of my lane), which in turn shut off the ACC (pressing "Resume" didn't seem to do anything - it was as if it had forgotten the last speed I had set). The Outback almost *never* loses the lead car once it has been acquired, so I'm a big fan of EyeSight. I'll repeat what I've said multiple times on this forum; EyeSight came out in around 2011 in the U.S. (I think) so they've been actively working to improve it for many years. On the other hand, some brands are only just now (or in the past year or two) had ACC so they are, as I would expect, behind in terms of refinement.

 

[QuantumPion]

what distance setting do you have the adaptive cruise control set to?

I tried every setting. The farthest setting made it not quite as bad but still intolerable.

Have you tried adjusting the sensitivity of the SCC?
View attachment 14158

No, I didn't know about that option, I will definitely give that a shot.

I'm sorry to hear about this. I have a question about the circumstances in which the car waits too long to slow down.
1. Does this happen every time? [Yes]
2. Does the adaptive cruise control (ACC) show when it has acquired a car in front of you? [Yes.] If so, have you noticed whether the icon for the lead car is there in situations when the car waits too long and then has to put the brakes on hard? [The ACC has no problem tracking the car in front, it has not lost lock. It just seems to really lag its response when the car in front stops. It has no problem speeding up/slowing down at highway speeds.]

 

[Doel]

I tried every setting. The farthest setting made it not quite as bad but still intolerable.



No, I didn't know about that option, I will definitely give that a shot.

try adjusting the sensitivity and if that doesn't work, visit the dealership. It should be really smooth.

 

[MikeysGT]

I just went for a drive with a Bluetooth OBD2 adapter hooked up transmitting data to my phone through the Torque app. I found the 2 smoothest, flattest roads I could find around here and monitored throttle position with CC engaged at 55mph then again at 75mph. Every time I felt the surge I would make sure to watch the throttle reading. At 55mph it jumped up by about 2% every time. At 75mph it was much more apparent and jumped by 4% every time the surge was felt from 24% to 28% or even 29% sometimes. For what reason? I dunno, I'm not a tuner, but if I can find data like this with an $11 adapter and 20 minutes of time, let's hope KIA can do the same and fix the logic.

 

[ZyroXZ2]

I'm a lazy bastard and didn't read all 7 pages, but CC also "surges" on me all the time. It's the worst CC I've ever felt, but it's not like it jerks me around. It just surprises me that in all of the testing, no one said, "hey, the CC feels a little unsmooth".

However, I think this also has to do with the throttle response mapping: I've always felt that the pedal has too short of a travel and too sharp of an initial throttle input. While a pedal tuner can smooth this out, CC likely ignores that and just feeds digital "throttle" signals. I tried to maintain a perfect speed with my foot on the same roads I normally use CC, and found that I was bouncing above and below because even the slightest input caused me to accelerate passed my intended speed, and there was no in-between: anything less was letting off and I slowed down below the intended speed.

 

[MikeysGT]

I took a screen shot of a line graph I recorded on my app to show the tech at my dealership what the throttle is doing so he doesn't think I'm crazy when we go for a ride and figured I'd share it here as well. It can be worse than this, but this was just a quick one I snapped so he gets the idea..

 

[QuantumPion]

try adjusting the sensitivity and if that doesn't work, visit the dealership. It should be really smooth.

I tried both the fast and slow setting along with changing the ACC follow distance but it made little difference. The ACC works fine at speed or in "slow & go" traffic. But if the vehicle in front of me comes to a complete stop, the stinger keeps moving until much later than I would myself gradually apply the brakes, and when it does apply brakes does so very strongly and abruptly. If the car in front of me moves forward just 10-20 feet, my car speeds up and then slams on brakes again, resulting in very carsick-inducing deceleration.

Is there an iphone app that can record gforces vs. time as a plot? I would like to record accelerometer readings along with dashcam footage to show what is going on.

 

[JeffAsfbay]

There are probably a multitude of iPhone apps but I don't have one on my phone. I'm sure you will find some - I'll try to remember to look too, but I've got a lot of other things on my plate right now.

 

[MikeysGT]

Just left the dealership. The "Stinger tech" test drove my car and then I went on a drive with my SA. The tech said he didn't feel the surge. SA said he felt it a little under certain conditions however I can specifically tell you they never recorded any data which I specifically asked them to do. My SA was helpful, though, in telling me he will talk to other owners to see if they have experienced the same thing and told me to continue graphing my throttle conditions. After I get a few good instances, email him the graphs so he can start a tech bulletin with Kia Motors and show them the info I have been finding. So.. Not much progress

 

[Kamauxx]

That's about what I expected.

 

[MikeysGT]

Has anyone tried doing a battery pull or know what the idle relearn procedure is? Not that it'll make any difference, but it's something quick and easy we could try without much fuss