No automatic braking with Cruise Control ?
I am a bit surprised to find that when using cruise control and going down a hill, the car does not brake to keep the selected speed. The car just speeds up due to gravity. I presume all of your RDXs act similarly?
My 2011 BMW 335i did apply the brakes to maintain the selected speed. |
|
Oddly enough, Acura does not do everything a BMW does. Who’d have thunk it?
My 2008 535 did apply the brakes to maintain cruse control speed. Otoh, you can’t get torque-vectoring AWD on a comparable BMW at all. |
My 2011 and 2015 Hyundai Genesis’ both braked to keep the preset speed!
|
If there is anything that really needs automatic braking on cruise control, it was that cruise ship in Venice.
|
I guess I am the odd one on this as I don't want the cruise to apply brakes on down hills. Why? Well, gas mileage for one reason. I have noted on this car and my previous Honda CR-V's that in hilly regions I did better on gas by driving the car myself than by letting R2 drive it. To accomplish this I let the car speed up on its own (within reason) on the down hill and then give it just enough throttle on the uphill to keep the speed from dropping too much. Cruise controls tend to chop the speed on the downhills only to gas it hard (wasting fuel) on the uphill trying to maintain a set speed. I see 3 to 4 MPG difference between cruise and "me" driving the car in hilly regions (like i have in Kentucky where I live). On the flatland of Indiana or Ohio the cruise does fine on mileage as you don't get all the variations in speed due to altitude changes.
I won't judge a complete car on the merits of one function. I see the vehicle as a total package. Like would I trade my wonderfully performing RDX for a Kia over the operation of a cruise control? Nah! But you might..... |
Originally Posted by Madd Dog
(Post 16433974)
Oddly enough, Acura does not do everything a BMW does. Who’d have thunk it?
My 2008 535 did apply the brakes to maintain cruse control speed. Otoh, you can’t get torque-vectoring AWD on a comparable BMW at all. |
Originally Posted by Madd Dog
(Post 16433996)
If there is anything that really needs automatic braking on cruise control, it was that cruise ship in Venice.
At first, I also thought it was in Venice, LA, lol.... |
Now doesn't it downshift and engine brake to loose excessive speed?
Suppose you're going down a tall mountain with cruise set at 50 mph, will it speed up to 100 mph just because of gravity? |
I go down a steep grade fairly frequently, so I put the Transmission in Sequential Mode and use the Paddle Shifter to "Engine Brake" the speed. It works very effectively.
|
Originally Posted by Madd Dog
(Post 16433974)
Oddly enough, Acura does not do everything a BMW does. Who’d have thunk it?
My 2008 535 did apply the brakes to maintain cruse control speed. Otoh, you can’t get torque-vectoring AWD on a comparable BMW at all. |
Honda used to have Grade Logic Control to hold a lower gear to maintain your speed up or down a hill. I don't think Honda/Acura has that anymore? Might have to do it manually by tapping the paddles a few times on downhill runs to maintain your speed. I had a few MDX loaners with the 9AT and the vehicle would speed up when I hit the paddles to downshift to slow down. I would have to hit the paddles 4-5 times before I would get the braking I needed before hitting a curve. Not sure if the 10AT does the same downshift/acceleration quirk and/or the 2.0T may not have enough engine braking on a 2 ton vehicle to make a difference unless you drop 4-5 gears?
|
Originally Posted by Midnight Mystery
(Post 16434104)
Now doesn't it downshift and engine brake to loose excessive speed?
Suppose you're going down a tall mountain with cruise set at 50 mph, will it speed up to 100 mph just because of gravity? |
Originally Posted by Alias1431
(Post 16434099)
Does the X3 M40i have it?
The X6 has it. The brochures are vague. I would not trust a salesman to know or say whether a particular car has torque or brake vectoring. I would want to see it in official BMW print. Maybe a monroney sticker? |
If we didnt have this post than we would have the "had to get new brakes at 9k miles" post like what you get on the other manufacturer forums. The systems tend to just ride the brakes causing them to need to be replaced frequently.
Rather have it our way tbh. I hated driving my c43 out of the mountains in cruise control. |
Doesn't the ZF-9 and 10AT differ so much (and use newer designs?) That is likely the cause of losing grade logic...
|
Originally Posted by horseshoez
(Post 16434166)
Did your 535i apply the brakes, or did it simply downshift the transmission?
I did European delivery, and went from unlimited into a much lower limit. I hit the stalk about 6 or 7 times at -5 each time, and them brakes worked. In day to day driving, the cruise control speed never varied by more than 2 or 3 mph, up or down a hill, regardless of how steep it was. |
Originally Posted by mrgold35
(Post 16434179)
Honda used to have Grade Logic Control to hold a lower gear to maintain your speed up or down a hill. I don't think Honda/Acura has that anymore?
Originally Posted by Midnight Mystery
(Post 16434592)
Doesn't the ZF-9 and 10AT differ so much (and use newer designs?) That is likely the cause of losing grade logic...
This can be verified by reading the powertrain press releases or viewing the transmission description of operation in the service information (subscription required). Here's the powertrain press release for the 2019 RDX: "Sequential SportShift 10-Speed Automatic Transmission with Paddle Shifters
Honda's CVT's don't have or need Grade Logic Control since there are no "gears to hunt between". Most of them, however, have Honda's G-Design shift logic which is intended to emulate the feel of a stepped automatic transmission while negating some of the benefits of a continuously variable transmission in order to make the powertrain feel more "natural". |
Originally Posted by mrgold35
(Post 16434179)
Honda used to have Grade Logic Control to hold a lower gear to maintain your speed up or down a hill. I don't think Honda/Acura has that anymore? Might have to do it manually by tapping the paddles a few times on downhill runs to maintain your speed. I had a few MDX loaners with the 9AT and the vehicle would speed up when I hit the paddles to downshift to slow down. I would have to hit the paddles 4-5 times before I would get the braking I needed before hitting a curve. Not sure if the 10AT does the same downshift/acceleration quirk and/or the 2.0T may not have enough engine braking on a 2 ton vehicle to make a difference unless you drop 4-5 gears?
|
Originally Posted by samiam_68
(Post 16435501)
^^ This. Tiny engines in big heavy vehicles are not very useful for engine braking.
|
Actually I find it annoying Acura doesn’t use engine braking to maintain speed when going down a steep incline. It is a nice thing to have and why it doesn’t work I have no idea. Because it does have it already!
When using ACC and you come upon another vehicle it maintains the speed using this method including when you are behind another car going down a hill. So not having it always maintain speed doesn’t make sense. |
Originally Posted by stevesTL
(Post 16448508)
Actually I find it annoying Acura doesn’t use engine braking to maintain speed when going down a steep incline. It is a nice thing to have and why it doesn’t work I have no idea. Because it does have it already!
When using ACC and you come upon another vehicle it maintains the speed using this method including when you are behind another car going down a hill. So not having it always maintain speed doesn’t make sense. |
Originally Posted by zroger73
(Post 16448513)
On each of the 11 Hondas I've owned since 2006 - including the 2019 RDX I had, the transmission will downshift to take advantage of engine braking during cruise control operation if the vehicle exceeds the set speed by more than a few MPH.
|
Originally Posted by JB in AZ
(Post 16448529)
Yes, I find that my RDX does this as well, but my previous 18 CR-V did not, as it has a CVT.
Not that this means much, but it makes a point! |
Originally Posted by Midnight Mystery
(Post 16448538)
2. I used to watch Scotty Kilmer's channel regularly until I caught on to his misinformation and extreme bias. The last video of his I watched was one that contained reasons to avoid a Honda Ridgeline. It was full of incorrect information. 3. CVT's most definitely allow for engine braking. The one in my 2016 Honda CR-V Touring did! The owner's manual for the 2016 CR-V even explains this: Drive (S) Used: ● For better acceleration ● To increase engine braking ● When going up or down hills Low ● Used to further increase engine braking |
Originally Posted by zroger73
(Post 16448638)
1. In this video, he stated he rented a Ford Focus with a CVT. The Focus has never had a CVT! The first and second generations offered a traditional automatic transmission. The third generation offered a 6-speed dual clutch (automatic) transmission - this transmission had some problems, but it was a completely different design than a CVT. In the comments, he wrote, "...meant to say I rented a Ford Fusion not Focus..." The Fusion doesn't have a CVT, either! The Fusion Hybrid has an "E-CVT", but that, too, is a completely different type of transmission than a CVT.
2. I used to watch Scotty Kilmer's channel regularly until I caught on to his misinformation and extreme bias. The last video of his I watched was one that contained reasons to avoid a Honda Ridgeline. It was full of incorrect information. 3. CVT's most definitely allow for engine braking. The one in my 2016 Honda CR-V Touring did! The owner's manual for the 2016 CR-V even explains this: The issue being discussed, I believe here (please correct me if I am wrong) is engine braking using cruise control while on a downgrade. It is true that most CVTs offer a "Low" option, I don't believe that most drivers will use the LOW position on a CVT to keep the speed close to the CC set speed...while a normal geared transmission will downshift automatically in many cars, the 19 RDX included, from my experience. I was recently on a long 6% downgrade and the vehicle speed never went more than 5 mph over the set speed. |
Originally Posted by zroger73
(Post 16448638)
1. In this video, he stated he rented a Ford Focus with a CVT. The Focus has never had a CVT! The first and second generations offered a traditional automatic transmission. The third generation offered a 6-speed dual clutch (automatic) transmission - this transmission had some problems, but it was a completely different design than a CVT. In the comments, he wrote, "...meant to say I rented a Ford Fusion not Focus..." The Fusion doesn't have a CVT, either! The Fusion Hybrid has an "E-CVT", but that, too, is a completely different type of transmission than a CVT.
2. I used to watch Scotty Kilmer's channel regularly until I caught on to his misinformation and extreme bias. The last video of his I watched was one that contained reasons to avoid a Honda Ridgeline. It was full of incorrect information. 3. CVT's most definitely allow for engine braking. The one in my 2016 Honda CR-V Touring did! The owner's manual for the 2016 CR-V even explains this: The Honda Ridgeline video was BS... He said they have "massive engine problems"... :rofl: That's one of the oldest and most tried and true engines still in production! However, I feel he has a point about CVT's even though he was wrong about the facts about the car... But I already am lead to believe Honda has one of, if not the best, CVT out there, so......... |
Both my wife’s Accord’s CVT and my RDX do use grade logic control, and you see the revs go up in the CVT and in the RDX. It is just not producing enough engine braking to keep the set speed, and will often go 5mph over. If ACC is active on the RDX, it will brake when the speed of the other car calls for it.
Popping the left paddle a couple or three times usually gets me the results I am looking for. |
All times are GMT -5. The time now is 10:23 AM. |
© 2024 MH Sub I, LLC dba Internet Brands