Coasting?

[Mcc]

@TinsleyC based on the above I highly recommend you not shift into neutral when driving.

Ditto that

 

[Husky]

Former transmission design engineer here (for off highway applications so my experience is not exactly apples to apples) though some of my former coworkers did transmission/powertrain design for OEM automanufacturers. I don't own a Genesis (though strongly considering) so I can't definitively say that they use the same hardware architecture, but on the applications I've worked there's a single speed oil pump that lubricates the transmission which is driven by the engine. So the faster the engine turns, the more lube oil goes the transmission. If Genesis does the same (which other automakers do), then when you coast and the engine gets decoupled and it's speed drops to idle (let's call it 1200 RPM) from 2400 rpm at 70-75mph (feel free to correct me if I have the wrong engine speeds listed) then lube flow to the transmission would drop by 50% but the ground speed still stays the same.

Neutral is a specific clutch engagement position where the output shaft spins but does not receive power from the torque converter. When in neutral the transmission still spins regardless of what the engine does so if the car has appreciable ground speed but little/no engine speed, the transmission can overheat due to lack of lube flow. This is the same reason why you tow FWD drive cars with the back wheels on the ground and why you tow RWD cars with the front tires on the ground (you want the wheels that aren't connected to the transmission to spin).

@Toddasaurus the feature in the torque converter (TC) you're talking about is the lockup clutch (LUC). In "converter drive" there is a speed differential between the flywheel side of the TC (impeller) and the transmission side (turbine). At low engine speed this speed differential creates torque multiplication and can help initial acceleration (TC output is slower than the engine flywheel) but at high speed this is known as convertor loss or drag (when you want the output shaft to spin as quickly as the engine but can't because of the fluid coupling). The LUC connects the impeller to the turbine to achieve a "direct drive condition" which engages (and disengages) when the TC output speed sensor hits a certain value. This makes the TC output shaft speed the same as engine flywheel. This can be seen almost like an "extra shift" but the feel may not necessarily have a pronounced feel. To try it, go into automode and let the car shift into 8th gear on it's own and keep the ground speed constant. You should see the engine RPM drop again (slightly) this is the LUC. The benefit of the mechanism is only realized at higher speeds to reduce fuel consumption so I'm not sure if the transmission software would enable LUC at anything other than 8th gear.

@TinsleyC based on the above I highly recommend you not shift into neutral when driving.

Thanks so much for your insight as a professional with applicable experience. Good stuff.

 

[TinsleyC]

@TinsleyC based on the above I highly recommend you not shift into neutral when driving.

Thank you for the advice, well taken! This thought first came up when I had my Infiniti G37, it had a tremendous amount of engine braking when coasting. From 50 MPH on a flat road, it would slow to a crawl after about a block. In neutral, it would roll for several blocks. Fortunately I didn't do this much. Again, great info to know, thanks. I'll stay in gear.

 

[ECF]

@Husky @TinsleyC happy I could help. I've been stalking this forum for quite sometime and I'm impressed with the knowledge sharing about various topics, from the different members (especially with all the nodding that @Toddasaurus does) so I'm glad I'm able to contribute.

@TinsleyC the other big reason why it's not advisable to coast is a safety concern. In case sudden acceleration is needed to avoid a hazard a person's first reaction may not be to put the car back into gear before mashing the accelerator. If that happens they would lose precious response time which they may not be able to afford.

 

[Cereal Box]

I'm not sure how damaging coasting is to the transmit but if they included this feature they must have tested it rigorously

Either way I only use in very specific locations and almost zero traffic. If damage occurs it'd be from coasting then accelerating multiple times in traffic.

 

[tarhoosier]

I wonder if coasting engaged was for fuel use calculations for the vehicle. Similar as to auto stop must be the default if used for advertised mileage/km. (2L only in our case)

 

[Hellothere]

Hmm, might turn off the coasting feature now.

 

[superppatel]

I have only seen my 2019 G70 3.3T coast once in the 4 months I've owned it and that was for about 5 seconds. I did the 13.5 S/W upgrade about 2 weeks ago and it sounds like it may never happen again...
Enjoy,
Carguy55

Hi,

I have a 2020 G70 3.3T but I am in Canada, how can I check what version I have? I tried looking in the General settings but couldn't find anything there.

Please guide me. - Thank You

 

[Husky]

In two years and 16500 miles I've never seen my G70 coast. Now to be fair, I'm not usually driving in ECO mode, but on many occasions over the last two years I've specifically tried to see if it will "enter Coast mode" (just as an experiment), but it never has that I can tell. Lifting slowly off the gas in ECO mode, on a flat road or slightly downhill without cruise control, at speeds of 50-70 mph, nothing. The car just slows down with no indication of coasting on the display.
I wouldn't use it anyway because i don't really see the value, but I am curious why it doesn't seem to work.
I wonder what other people's experience has been.

 

[Bhavie]

In two years and 16500 miles I've never seen my G70 coast. Now to be fair, I'm not usually driving in ECO mode, but on many occasions over the last two years I've specifically tried to see if it will "enter Coast mode" (just as an experiment), but it never has that I can tell. Lifting slowly off the gas in ECO mode, on a flat road or slightly downhill without cruise control, at speeds of 50-70 mph, nothing. The car just slows down with no indication of coasting on the display.
I wouldn't use it anyway because i don't really see the value, but I am curious why it doesn't seem to work.
I wonder what other people's experience has been.

I don't think you're alone. I recall others also having issues with it never activating.

I, for one, have never had an issue. I used it a bunch when the car was still new and it would coast without fail pretty much every time. I ended up turning the feature off after the post by ECF, so not sure about it now.

I think it's in this thread, or somewhere on this forum, where there's mention that an ECU update increased the number of criteria for coasting to work. Since then, it's been really hard to activate it. My guess is the engineers realized the harm that the feature can cause and make it virtually impossible to activate.

EDIT: post #19 details the change.

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[Slip_Angle]

Mine often says coasting in Eco mode.

 

[Husky]

Mine often says coasting in Eco mode.

That's curious.
I did update the software once about a year ago, which may have made it even harder to coast. Shrug.

 

[Slip_Angle]

That's curious.
I did update the software once about a year ago, which may have made it even harder to coast. Shrug.

Hmm. Wonder why we have different experiences and why Genesis would turn it off.... possible cause of some issue??

 

[superppatel]

Not sure if doing an update of the infotainment system update (Maps, and etc.) would make a change!

I am running the latest update which was released on April, 2021 but still that makes my question unclear about the version 1.35.
Updates were done from: Notice | Official Genesis Navigation Update Website

I noticing my car when in Eco mode goes to Coast so many times (Cruise OFF, Lane Departure OFF, Shifter in D). I know that it's help with gas and kills transmission as previous people have mentioned. To be fair I have this car is on lease and it's less of concern for me. Going to return the car after lease ends anyways.

FYI: I got 2020 year model but it was delivered to me in October, 2019.

 

[csu87]

In two years and 16500 miles I've never seen my G70 coast. Now to be fair, I'm not usually driving in ECO mode, but on many occasions over the last two years I've specifically tried to see if it will "enter Coast mode" (just as an experiment), but it never has that I can tell. Lifting slowly off the gas in ECO mode, on a flat road or slightly downhill without cruise control, at speeds of 50-70 mph, nothing. The car just slows down with no indication of coasting on the display.
I wouldn't use it anyway because i don't really see the value, but I am curious why it doesn't seem to work.
I wonder what other people's experience has been.

pretty sure you have to activate coasting through the menus. It isnt always defaulted to "on"

 

[UPSmechanic]

I've owned my car for more than a year now. I drive almost all the time in Smart mode. in the flat roads of Florida and the car coats a lot

I don't want to threadjack and/or revive a dead thread but I cannot find any sort of messaging feature on this forum. I am prospecting the purchase of a new facelifted 2022 G70 and have a question for you Mr. danygenesis. I have read a couple different threads where you have chimed in that you run 87 octane fuel and commute a decent amount. I am curious what mileage you are at and if you have been running 87 octane the whole time? A follow on to this is have you had any mechanic issues that may or may not be related to the fuel you are running.

Once again I am sorry to go slightly off topic here.