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#4478685 - 08/04/17 01:14 AM Lugging even with computer control?
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: S California
I've been driving this 2017 Sonata company car. It's a basic 4 cylinder GDI rental model.

My question is when driving in a smooth manner trying to get good fuel mileage you can lug the engine at 1,100 rpm by just gently accelerating. There's no down shift and you can hear and feel the engine lugging. I thought with computer control and a 6-speed automatic transmission this would not happen.

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#4478688 - 08/04/17 01:18 AM Re: Lugging even with computer control? [Re: OneEyeJack]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
You'd really need to be seeing what the software is doing REAL TIME on a monitor before coming to any conclusions.
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#4478691 - 08/04/17 01:25 AM Re: Lugging even with computer control? [Re: OneEyeJack]
Colt45ws Offline


Registered: 08/15/06
Posts: 9640
Loc: Central Washington
Well of course it lugs it. That minimizes rotational losses and maximizes fuel economy. Thats why LSPI is the talked about thing these days; from running these engines hard at a low RPM.
I realize this isnt a turbo car, but they are still going to run it as low as they can get away with.
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#4478696 - 08/04/17 02:24 AM Re: Lugging even with computer control? [Re: Colt45ws]
Shannow Online   content


Registered: 12/12/02
Posts: 39858
Loc: 'Stralia
Originally Posted By: Colt45ws
Well of course it lugs it. That minimizes rotational losses and maximizes fuel economy. Thats why LSPI is the talked about thing these days; from running these engines hard at a low RPM.
I realize this isnt a turbo car, but they are still going to run it as low as they can get away with.


Same with my baby Duramax Colorado...can even hear knock on light throttle up in town settings.

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#4478697 - 08/04/17 02:43 AM Re: Lugging even with computer control? [Re: OneEyeJack]
user52165 Offline


Registered: 10/21/11
Posts: 1331
Loc: CA
If it has an ECO button, turn it off.

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#4478723 - 08/04/17 05:21 AM Re: Lugging even with computer control? [Re: OneEyeJack]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
Are you the only one to drive it? The adaptive transmission might be shifting just right for the last person who drove it, but it will need time to learn your habits.

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#4478730 - 08/04/17 05:46 AM Re: Lugging even with computer control? [Re: OneEyeJack]
demarpaint Offline


Registered: 07/03/05
Posts: 29758
Loc: NY
Originally Posted By: OneEyeJack
I've been driving this 2017 Sonata company car. It's a basic 4 cylinder GDI rental model.

My question is when driving in a smooth manner trying to get good fuel mileage you can lug the engine at 1,100 rpm by just gently accelerating. There's no down shift and you can hear and feel the engine lugging. I thought with computer control and a 6-speed automatic transmission this would not happen.


That was always my complaint with high revving engines that lacked torque, and programming to get max mpgs. Too many gears and not enough power to properly utilize it. I bet its probably in 4th or 5th gear at 1,100 rpm and you have to step on it harder to force it to drop a gear, or two. Try a 9 speed mated to a 4 cylinder and you'll really go nuts. hide

The lugging can't be good for the engine either.
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#4478739 - 08/04/17 06:03 AM Re: Lugging even with computer control? [Re: OneEyeJack]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18953
Loc: Sunny Florida
You poor fellows would probably shriek as my sig car putts around town turning corners and lugging out in 4th gear at 900 rpm.

There is no way this can hurt any modern engine...
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#4478742 - 08/04/17 06:09 AM Re: Lugging even with computer control? [Re: OneEyeJack]
KrisZ Offline


Registered: 12/23/06
Posts: 7467
Loc: Toronto, Canada
I highly doubt it's lugging. The RPM is simply much lower than what OP is used to.
Is it noisier, is there more vibration, maybe a little bit of surging? If not, it's nut lugging.
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#4478782 - 08/04/17 06:59 AM Re: Lugging even with computer control? [Re: OneEyeJack]
LoneRanger Offline


Registered: 07/02/07
Posts: 4058
Loc: Midwest USA
2015 Ford Fusion fleet model company car does same thing when shifter is in normal D position. Putting it in S for sport stops the lugging. But in D it will lug right down to a where you can feel the car start to shudder and will stay there unless you let off or tip in some more throttle to get it to release or downshift.
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#4478808 - 08/04/17 07:48 AM Re: Lugging even with computer control? [Re: OneEyeJack]
PimTac Offline


Registered: 03/04/17
Posts: 4285
Loc: Soviet State of Washington
This situation happens more often with a cvt transmission in my experience. They want to keep the engine rpms at a efficient speed.
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#4478836 - 08/04/17 08:33 AM Re: Lugging even with computer control? [Re: Ethan1]
Leo99 Offline


Registered: 03/30/14
Posts: 3041
Loc: NJ
Originally Posted By: Ethan1
Are you the only one to drive it? The adaptive transmission might be shifting just right for the last person who drove it, but it will need time to learn your habits.


I agree with this. When I first got my Camry, it was full of pep and I enjoyed the extra power it had compared to the Corolla I was driving. My driving style calmed down and I noticed the lugging. It got real lazy and was in too high of gear and unresponsive at 1500 rpm. Since driving a little more spirited, the lugging has gone away.
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#4478859 - 08/04/17 08:54 AM Re: Lugging even with computer control? [Re: OneEyeJack]
meep Offline


Registered: 02/20/07
Posts: 3552
Loc: Southeast
I don't mind the low-rpm pull in the wife's crv at all. To truly 'Lug' as one can in a manual, you've also got to be putting in enough throttle input to stress it. In the autos, significant throttle command inspires a downshift. The lower-power lower rpm use, I actually find nice, makes it behave as if it is torquey. maybe it is. As long as the internals are adequately sized, it's just the sensation of vibration to me. I wouldn't worry about it.

good luck,
-m
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#4478874 - 08/04/17 09:11 AM Re: Lugging even with computer control? [Re: SteveSRT8]
demarpaint Offline


Registered: 07/03/05
Posts: 29758
Loc: NY
Originally Posted By: SteveSRT8
You poor fellows would probably shriek as my sig car putts around town turning corners and lugging out in 4th gear at 900 rpm.

There is no way this can hurt any modern engine...


Not sure what vehicle you're referring to. If it's the Hemi RAM with the 8 speed ZF, that certainly has the power to properly utilize all those gears.
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#4478962 - 08/04/17 11:32 AM Re: Lugging even with computer control? [Re: OneEyeJack]
Whimsey Offline


Registered: 12/22/02
Posts: 4047
Loc: The Garden State
Our 2017 2.3 Eco Boost Explorer in the 45-50 mph range is running at around 1300-1400 rpm at steady throttle. It doesn't appear to lug and a slight tip in on the throttle will increase the rpm's quickly. I'm used to driving manual transmission 4 cylinder vehicles and it just seems like low rpm's. But since this a computer controlled automatic vs a manual I just have to get use to it smile.

Whimsey

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