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Honda Jazz, HR-V & Hybrid Forums => Honda Jazz Mk4 2020 - => Topic started by: RichardA on December 08, 2019, 11:27:02 AM

Title: Honda Jazz Mk4 2020
Post by: RichardA on December 08, 2019, 11:27:02 AM
(http://clubjazz.org/images/attach/jazz2020.jpg)

Press release for the Mk4 Honda Jazz due in 2020:

https://hondanews.eu/gb/en/cars/media/pressreleases/194431/all-new-jazz-leads-electrification-charge-for-honda

More information will added here when available.
Title: Re: Honda Jazz Mk4 2020
Post by: jazzaro on December 09, 2019, 07:35:49 PM
Waiting for tech specs..
Title: Re: Honda Jazz Mk4 2020
Post by: langserve on December 24, 2019, 12:06:18 PM
Had to visit the dealer for a 6 month check up yesterday and picked up the brochure. I don't really see anything that makes me regret deciding to buy one of the last Mk3s of the production run. The body looks fine but it isn't really any different and if the rear looks more like a Mk1 in my opinion so good but nothing terribly exciting. The interior is good and the visibility even more impressive. And the colour schemes? Well I'll let you decide but I think its more a pitch to the young woman market than the duffer market.
Title: Re: Honda Jazz Mk4 2020
Post by: peteo48 on December 24, 2019, 02:16:41 PM
Waiting for tech specs..

Fuel consumption will be interesting given the new hybrid set up. My Mk3 is not great on fuel consumption although that is mostly down to short stop/start journeys in cold wet weather. I haven't seen 50 mpg as a long term average since my VW Golf TDI and that was a 2005 model.

I know one or two people who have the hybrid Yaris and that gets significantly better mpg than the Jazz in the urban environment. On the open road, much less so.

I'd be interested in a Mk4.
Title: Re: Honda Jazz Mk4 2020
Post by: langserve on December 25, 2019, 03:01:03 AM
No technical details I am afraid - anything but! Anyway, FWIW here is the page dealing with e:HEV. From what I can make out it claims to be the first HEV drive of its kind available in a small car. In the diagrams orange is mechanical energy and blue is electrical energy. The box at the top is the petrol engine and the box in the middle is the electric motors. There are three modes. Electric only, engine generates electricity and that electricity powers motors rather like a diesel electric train and finally conventional engine drives wheels. They say that the vast majority of daily driving will be in electric mode - longer and faster journeys will need mode 2 and 3 respectively. It will also be available in 4WD for people living in Hokkaido and such places which are covered in snow for 3 months of the year. Here I think it will be available in all models except basic but it will cost quite a lot extra. And that's what puts me off - I only do about 4,500 miles a year tops so I don't believe it is worth it. I haven't actually done the calculations though.
Title: Re: Honda Jazz Mk4 2020
Post by: nigelr on January 10, 2020, 12:03:27 PM
Will be very interested to see how efficient the new power train is.
Title: Re: Honda Jazz Mk4 2020
Post by: jazzaro on January 14, 2020, 09:31:13 AM
No technical details I am afraid - anything but! Anyway, FWIW here is the page dealing with e:HEV. From what I can make out it claims to be the first HEV drive of its kind available in a small car.
No, Toyota Yaris is already avaiable with a E-CVT hybrid system. Jazz is the first small car for Honda with a full hybrid E-CVT powertrain.
Quote
In the diagrams orange is mechanical energy and blue is electrical energy. The box at the top is the petrol engine and the box in the middle is the electric motors. There are three modes. Electric only, engine generates electricity and that electricity powers motors rather like a diesel electric train and finally conventional engine drives wheels. They say that the vast majority of daily driving will be in electric mode - longer and faster journeys will need mode 2 and 3 respectively. It will also be available in 4WD for people living in Hokkaido and such places which are covered in snow for 3 months of the year. Here I think it will be available in all models except basic but it will cost quite a lot extra. And that's what puts me off - I only do about 4,500 miles a year tops so I don't believe it is worth it. I haven't actually done the calculations though.
Jazz has always been avaiable in 4WD for japanese domestic market, such as Toyota Yaris and many other models. Most of them are not exported, in Europe we had only Subaru Justy, Suzuki Swift and Suzuki Wagon R+ offered also in 4WD. Present Jazz, called Fit in JDM, is sold with 1.3, 1.5, 1.5Hybrid I-DCD and each engine can have 4WD, both with manual or CVT gearbox (except the Hybrid sold only with the dual clutch gearbox).
Easily the Fit 4WD will have a similar  scheme to the CR-V.
Title: Re: Honda Jazz Mk4 2020
Post by: peteo48 on January 14, 2020, 11:27:57 AM
My understanding is that the new transmission is NOT a CVT but something completely different. I gather the driving experience will be more like that of an electric car most, if not all of which, have a single reduction gear.

In short they are claiming a significant technological advance from Toyota's system.
Title: Re: Honda Jazz Mk4 2020
Post by: Downsizer on January 14, 2020, 12:45:37 PM
My understanding is that the new transmission is NOT a CVT but something completely different. I gather the driving experience will be more like that of an electric car most, if not all of which, have a single reduction gear.

In short they are claiming a significant technological advance from Toyota's system.
That's right, but it depends how you define the word "transmission".  There will be no mechanical gear ratio changes.
Title: Re: Honda Jazz Mk4 2020
Post by: Jocko on January 14, 2020, 01:13:38 PM
The definition of Continuously Variable Transmission is what matters here, and in most drivers minds, especially with regards to the Jazz, CVT is recognised as a belt drive, step-less, mechanical transmission.
However, in engineering their are many varieties of Continuously Variable Transmission, as can be gleaned from this Wiki entry.

https://en.wikipedia.org/wiki/Continuously_variable_transmission (https://en.wikipedia.org/wiki/Continuously_variable_transmission)
Title: Re: Honda Jazz Mk4 2020
Post by: sparky Paul on January 14, 2020, 03:13:36 PM
There's no gearbox at all on the eCVT system, the engine switches between two modes - driving an alternator which charges the battery and/or drives the electric motor at low speeds, and a second mode via a clutch direct to the drivetrain via a single mechanical ratio for higher speed driving.
Title: Re: Honda Jazz Mk4 2020
Post by: peteo48 on January 14, 2020, 03:57:21 PM
That's what I understand sparky. The CVT on a hybrid Yaris is like the CVT on the current or Mk2 Jazz - the ratios change. The new Jazz has nothing in common, in terms of transmission, with the Toyota set up as seen on all their hybrid cars. Honda claim it is a completely new concept in a small car and I think they are justified in doing so.

I am looking forward to my test drive!
Title: Re: Honda Jazz Mk4 2020
Post by: sparky Paul on January 14, 2020, 07:09:19 PM
The new Jazz has nothing in common, in terms of transmission, with the Toyota set up as seen on all their hybrid cars. Honda claim it is a completely new concept in a small car and I think they are justified in doing so.

I am looking forward to my test drive!

The system seems to work well in the CR-V, if the Jazz is using the same.
Title: Re: Honda Jazz Mk4 2020
Post by: peteo48 on January 14, 2020, 10:18:20 PM
Just a random thought and almost certainly not original but are we on the cusp of seeing manual transmissions start a long decline and, to be fair, CVT's and conventional automatics?
Title: Re: Honda Jazz Mk4 2020
Post by: Jocko on January 14, 2020, 10:26:09 PM
I think that will be the case. BEVs do not require a gearbox and hybrids are moving that way too. Having driven automatics (buses and cars) for 25 years, my recent return to a manual transmission has confirmed what a PITA a manual vehicle is.
Title: Re: Honda Jazz Mk4 2020
Post by: jazzaro on January 15, 2020, 10:14:37 AM
That's what I understand sparky. The CVT on a hybrid Yaris is like the CVT on the current or Mk2 Jazz - the ratios change. The new Jazz has nothing in common, in terms of transmission, with the Toyota set up as seen on all their hybrid cars. Honda claim it is a completely new concept in a small car and I think they are justified in doing so.
Definetly no.
The E-CVT in hybrid yaris is the same of all other toyota hybrids, only size and battery type change: the petrol engine is always linked to the wheels through an epicliclic gear called PSD, power split device, where each of the carriers has the ability to rotate in its own unique way, providing a wide range of power options. The “Ring” carrier is sometimes powered by the battery-pack to provide the ability to drive using only electricity (both forward & backward), allowing the engine to stop running to save gas. At other times, the “Ring” carrier creates power, regenerating electricity when you use the brakes. The “Planet” carrier is powered by the petrol engine, which causes rotation of both the car’s wheels (for driving forward) and the “Sun” carrier (for generating electricity). And while the
“Planet” & “Sun” carriers are spinning, the “Ring” carrier can join in to provide additional thrust to the wheels or to allow engine RPM to be reduced. Lastly, the “Sun” carrier is also used for starting the engine.  It's  a sort of
 asymmetrical differential, because about 70% of the petrol engine power goes to wheels, the other 30% is directed to a small electric machine working as a motor (in both directions) but also as a generator, depending from the ECU. The other bigger electric machine is directly connected tho wheels, but it's the small one, connected to the sun gear, that set the "ratio" between the petrol engine and the wheels. In some old pics you can see a sort of chain inside this device, but it's only a chain connecting the ring gear with the final drive.
So the whole system works as a belt CVT, even if there are no belts inside. The same for the Honda I-MMD, working as a belt CVT but without belts; so both belong to the CVT transmission family, using wires and no belts, and that's why we cannot say that the Honda system is the first ECVT in the small car segment: both toy and honda are E-CVT without belts and pulleys, and Toy already sells a small ecvt hybrid car.

EDIT This is a simulator of the Toyota PSD (open it in Firefox because Chrome will close flash), Mg1 is the small motogenerator, Mg2 is the main electric motor connected directly with the wheels, ICE is the petrol engine: you can see how the vehicle speed (MG2) changes not following ICE and MG1 and, keeping ICE fixed, how the speed changes by MG1.
http://eahart.com/prius/psd/
Title: Re: Honda Jazz Mk4 2020
Post by: Jonnybananas on March 16, 2020, 08:55:24 PM
This may be old news but the new Honda Jazz Hybrid 21YM Owner's Manual seems to be available on the Honda website.

https://www.honda.co.uk/cars/owners/manuals-and-guides/honda-owners-manuals.html

The Jazz in the photo on that page is still the old MK3 Jazz but looking at the 21YM Owner's Manual PDF it's definitely the new 2020 Jazz Hybrid.
Title: Re: Honda Jazz Mk4 2020
Post by: John Ratsey on March 17, 2020, 08:39:48 AM
Some points arising from a quick look through the manual:
I've primarily looked to see if features on the Mk. 3 which have annoyed me have been fixed.

There is, as expected, nowhere for a spare wheel.
Title: Re: Honda Jazz Mk4 2020
Post by: Downsizer on March 17, 2020, 09:50:18 AM
It seems that someone in Honda has been reading your comments John!
Title: Re: Honda Jazz Mk4 2020
Post by: jazzaro on March 17, 2020, 03:54:57 PM
Good link!
Page 547, this Jazz will have a gasoline particulate filter so the engine will use only  0W20 oil Acea C2 or C5.
Title: Re: Honda Jazz Mk4 2020
Post by: JazzandJag on April 01, 2020, 08:39:22 AM
Configurator now live on the honda.co.uk website
Title: Re: Honda Jazz Mk4 2020
Post by: Jonnybananas on April 01, 2020, 12:16:42 PM
Interesting… having checked the specs for the Jazz Crosstar EX there is no mention of 'Blind Spot Information incl. Cross Traffic Monitor' - it is only mentioned in the Jazz EX specs.  However, the information from the Honda UK Media Newsroom website states 'Blind Spot Information, complete with Cross Traffic Monitor is standard on Executive grades'

Hopefully it’s a typo in the specs and not a cost cutting exercise  :(
Title: Re: Honda Jazz Mk4 2020
Post by: John Ratsey on April 01, 2020, 07:03:53 PM
I want a vehicle that's easy to find in a car park and the only colour which meets that requirement is Surf Blue.
Title: Re: Honda Jazz Mk4 2020
Post by: Jocko on April 01, 2020, 09:30:41 PM
But that is only available on the Crosstar.
Title: Re: Honda Jazz Mk4 2020
Post by: John Ratsey on April 01, 2020, 09:46:26 PM
But that is only available on the Crosstar.
True. Fortunately that's the version which most interests me as it claims to have a slightly higher ride height than the normal Jazz (one of the attractions of my current HR-V).
Title: Re: Honda Jazz Mk4 2020
Post by: dfconnolly on April 16, 2020, 03:07:40 AM
There are two videos of the jazz on YouTube being inspected and then road tested in what looks like snowy Japan......



The driving footage lacks any commentary and there is a lot of road noise due to slushy conditions.

A few things apparent.

The engine sounds coarsec when the accelerator is floored.

The suspension appears to thud harshly over potholes

There are some annoying audible warning alarm sounds

Not sure if the indicator stalk is on the right? Maybe just a Japanese or Eastern territory thing

Happy viewing

Dave C
Title: Re: Honda Jazz Mk4 2020
Post by: Downsizer on April 16, 2020, 09:33:05 AM
Thanks for these links.  I notice the car is 4WD - appropriate for that snow!
Title: Re: Honda Jazz Mk4 2020
Post by: jazzaro on April 17, 2020, 10:07:45 AM
No upper cover for the luggage compartment, the capacity looks similar to the present generation, apart the little step near the rear seat.
Electric lock for the fuel door.
Many parts in common with the present generation, both in cabin and in engine compartment.
Still noisy wiper motor, especially with the engine not running.
I cannot evaluate the NVH, but the engine seems to be quite during normal driving.
I don'l like this steering wheel
Title: Re: Honda Jazz Mk4 2020
Post by: Jocko on April 17, 2020, 10:36:02 AM
Looking at the dual image here https://www.honda.co.uk/cars/new/jazz-hybrid/overview.html (https://www.honda.co.uk/cars/new/jazz-hybrid/overview.html) and there does not appear to be any appreciable difference in height between the Jazz and the Crosstar.
Title: Re: Honda Jazz Mk4 2020
Post by: John Ratsey on April 17, 2020, 12:08:55 PM
Looking at the dual image here https://www.honda.co.uk/cars/new/jazz-hybrid/overview.html (https://www.honda.co.uk/cars/new/jazz-hybrid/overview.html) and there does not appear to be any appreciable difference in height between the Jazz and the Crosstar.
I think that whoever created that graphic was a bit lazy.

The detailed specs show that the Crosstar has slightly larger dimensions than the SE (I didn't check the others):
Length: 4090 vs 4044 mm (probably different plastic on front and back)
Width: 1725 vs 1694 mm (bits of plastic on the sides)
Height: 1556 vs 1526 mm
Ground clearance (driver only): 152 vs 136 mm

These numbers suggest that the suspension of the Crosstar is raised by 16mm. It's unclear if the overall height includes / excludes the roof rails. Could the rails be as low as 14mm above the normal roof? If the height doesn't include the rails then it's likely that the body (and the seats) are 30mm higher in the Crosstar than the normal Jazz.
Title: Re: Honda Jazz Mk4 2020
Post by: porew on April 17, 2020, 12:15:13 PM
Some months ago I was told in my local Honda dealership that Crosstar is 2cm higher and that it's achieved by a different setup on the suspension/spring level... the figures in techspecs say 3cm difference, so let's see in reality :)
Title: Re: Honda Jazz Mk4 2020
Post by: Pine on April 17, 2020, 01:59:30 PM
Some months ago I was told in my local Honda dealership that Crosstar is 2cm higher and that it's achieved by a different setup on the suspension/spring level... the figures in techspecs say 3cm difference, so let's see in reality :)
Plus 1cm for the roof rails?
Title: Re: Honda Jazz Mk4 2020
Post by: Austriaman on August 15, 2020, 10:37:19 PM
Had to visit the dealer for a 6 month check up yesterday and picked up the brochure. I don't really see anything that makes me regret deciding to buy one of the last Mk3s of the production run. The body looks fine but it isn't really any different and if the rear looks more like a Mk1 in my opinion so good but nothing terribly exciting. The interior is good and the visibility even more impressive. And the colour schemes? Well I'll let you decide but I think its more a pitch to the young woman market than the duffer market.
The big pull is the way the new Jazz drives. It's powerful, so smooth and seamless. It was the drive that sold me.
Title: Re: Honda Jazz Mk4 2020
Post by: John Ratsey on August 16, 2020, 03:56:02 PM
Plus 1cm for the roof rails?
Seeing this reminded me to get out my tape measure and a spirit level. I measured the highest part of the roof rails on one side to be 1560mm and the other side 1590mm (my old tarmac parking place isn't flat) which gives an average to the top of the rails as 1575mm. The highest part of the roof is in the middle and is about 25mm below the top of the roof rails, ie 1550mm (the rails are about 48mm higher than the sides of the roof). Honda give the Crosstar height as 1556mm so that's evidently the vehicle height excluding the rails.

The big pull is the way the new Jazz drives. It's powerful, so smooth and seamless. It was the drive that sold me.
It's the effortless power under my normal driving conditions that I like. Earlier Jazzes have the power provided the engine is revved but the Mk. 4 will shift off the line with a gentle touch of the accelerator and is also very responsive to slight changes in the accelerator position.

While the brake hold feature is very useful, it leaves me wondering where to put my right foot while waiting to move because, if I touch the accelerator then the vehicle will move.

Title: Re: Honda Jazz Mk4 2020
Post by: Kenneve on September 06, 2020, 09:45:26 PM
Hi Guys
One question that my dealer does not seem to be able to answer is: How does the transmission react when descending a very steep hill, one where in a manual gearbox car, you would maybe change down to 3rd or even 2nd gear to provide engine braking.

You may Say,  in the ‘B’ drive position the car would attempt to charge the battery, but what if the battery is already fully charged?  I can’t imagine the the braking resistance generated by charging the battery is anything like what would be generated by the engine in a low gear.

As I understand it, the engine directly drives the generator without any gear reduction.

I don’t think think I would like to descend Porlock hill or some of the Devon banks, relying entirely of the brakes, or am I just old fashioned?
Title: Re: Honda Jazz Mk4 2020
Post by: Jocko on September 06, 2020, 10:05:35 PM
Someone in another thread said that the motor/generator tries to turn the engine and this provides the engine braking.

I have driven The Pass of the Cattle on several occasions, in an automatic, and never felt the need to come out of Drive.
Modern brakes will cope with any steep descent in the UK without overheating or fading.

(https://www.visitwester-ross.com/userfiles/image/big_5/_med/bealach.jpg)
(https://i.pinimg.com/originals/d8/1f/88/d81f889b300063cf71711b7b0365cf0a.jpg)
Title: Re: Honda Jazz Mk4 2020
Post by: Kenneve on September 06, 2020, 10:44:53 PM
Hi Jocko

From the photos shown, that is certainly the sort of hill I’m talking about.
In my Mk3 I would certainly flick the paddle to change down to a lower gear, aa it would reduce the breaking effort required and of course the unnecessary  wear.
As I understand it , there aren’t any paddles on the Mk4, so you must rely entirely on your brakes, which as an old school driver I would not be happy with.
Many years ago, I did experience total brake failure, not something I would like to repeat!
Title: Re: Honda Jazz Mk4 2020
Post by: hotweiss on October 03, 2020, 09:12:51 PM
Hi Guys
One question that my dealer does not seem to be able to answer is: How does the transmission react when descending a very steep hill, one where in a manual gearbox car, you would maybe change down to 3rd or even 2nd gear to provide engine braking.

You may Say,  in the ‘B’ drive position the car would attempt to charge the battery, but what if the battery is already fully charged?  I can’t imagine the the braking resistance generated by charging the battery is anything like what would be generated by the engine in a low gear.

As I understand it, the engine directly drives the generator without any gear reduction.

I don’t think think I would like to descend Porlock hill or some of the Devon banks, relying entirely of the brakes, or am I just old fashioned?

That is what B is for. B is for engine break not battery.
Title: Re: Honda Jazz Mk4 2020
Post by: Jocko on October 03, 2020, 09:43:57 PM
That is what B is for. B is for engine break not battery.
Drive B. Used when driving down a long hill and to increase regenerative braking
From page 27 of the manual.
Regenerative braking is not engine braking and is used to charge the battery.
Title: Re: Honda Jazz Mk4 2020
Post by: hotweiss on October 03, 2020, 10:09:01 PM
OK, I was told that B is used for descending down hills. I had it on my Lexus CT...
Title: Re: Honda Jazz Mk4 2020
Post by: Roman on November 03, 2020, 02:04:42 PM
Actualy Jazz MK4 do use engine braking, after battery full on downhill i hear engine started, as i understand system uses energy that regenerated throught 109 hp motor to spin smaller motor-generator with connected to it gasoline engine, or instead system simple connecting engine to wells using cluth.
Title: Re: Honda Jazz Mk4 2020
Post by: Westy36 on November 03, 2020, 07:58:39 PM
I have driven The Pass of the Cattle on several occasions

What a fantastic road that is. Been lucky enough to drive that a 4 times over the years. Unforgettable drive  :D
Title: Re: Honda Jazz Mk4 2020
Post by: madasafish on December 26, 2020, 09:34:24 AM
"Plough lane
I purchased the new Honda Jazz Hybrid a few weeks ago. It is very refined and averages 70mpg but I am going to part-exchange it because of the Road Departure Mitigation System (RDMS). This feature will take control of the steering should you get close to the left-hand side of the road, and move the car to the centre. It might be OK for drunk drivers, or those who cannot concentrate for more than a few seconds, but for me, who drives 80 per cent  of the time in the narrow roads of the Lincolnshire Wolds, this feature is dangerous. I live in a farming community, so when I take a left-hand turn I get close to the edge as, more often than not, a very wide agricultural vehicle will be coming in the opposite direction. It can be turned off, but it has to be done for every trip, as it comes on again each time the car is started. If you forget, you could find yourself face-to-face with a combine harvester. I wrote to Honda asking why every other feature has to be turned on, but this one has to be turned off. No reply. The dealer could not help. I will never buy another car with this feature. ME"


"I had a Jazz Crosstar on test and found the same problem. It's very over-active. Any variation in the road surface would cause it to react. It comes on automatically because it is supposed to be a safety feature. Almost every other car now has something similar, but not as intrusively as on the Jazz. The new Toyota Yaris hybrid has a simple switch on the steering wheel to engage or disengage the RDMS. In the Suzuki Swift Sport 48v hybrid, it stays off once switched off and does not come on again after a restart."
https://www.telegraph.co.uk/cars/advice/honest-john-will-classic-morgan-christmas-heap-trouble/


If true, I will never buy one- same issues.
Title: Re: Honda Jazz Mk4 2020
Post by: Kremmen on December 26, 2020, 09:40:01 AM
I'd just switch it off, same with other things like parts of the auto braking system.

Most Civic 10G owners on Civinfo turn it off and operate the handbrake manually so it doesn't permanently display brake lights at traffic lights and junctions, dazzling drivers behind, but leave brake hold active.
Title: Re: Honda Jazz Mk4 2020
Post by: John Ratsey on December 31, 2020, 11:25:12 AM
It took me a while to figure out how to disable the RDMS but it's not difficult to learn how to suppress that invisible pair of hands trying to turn the steering wheel. While it may be a very useful safety measure for someone falling asleep on a motorway it's a nuisance on smaller roads. Perhaps the next generation of vehicles will add some more intelligence to this function.
Title: Re: Honda Jazz Mk4 2020
Post by: csp on December 31, 2020, 12:21:35 PM
Is there a Menu setting to disable RDMS? It is really annoying in town when driving past bus stop box lines on the road.
Title: Re: Honda Jazz Mk4 2020
Post by: stiggysawdust on January 01, 2021, 12:01:54 PM
When I turn my LKAS off, it stays off. I have to turn mine on when I want it working.
RDMS does indeed turn on when car is started.
Sorry for any confusion.
Title: Re: Honda Jazz Mk4 2020
Post by: Mellorshark on January 01, 2021, 02:03:45 PM
When I turn mine off, it stays off. I have to turn mine on when I want it working.

I think there might be some confusion between RDMS which is automatically turned on every time the power system is turned on, and LKAS which can be turned on/off by its switch.
Title: Re: Honda Jazz Mk4 2020
Post by: Expatman on January 01, 2021, 02:30:20 PM
Bit confused by this. What does RDMS do and what does LKS do that is different?
Title: Re: Honda Jazz Mk4 2020
Post by: CoolRaoul on January 01, 2021, 03:09:17 PM
When I turn mine off, it stays off. I have to turn mine on when I want it working
Strange: the user manual states it automatically turns on every time you turn the véhicule on (page 482)
(https://i.imgur.com/yUN7SDo.png)
And that match my experience.

**edit**

Sorry, I didn't noticed this had already been replied two post above.
Title: Re: Honda Jazz Mk4 2020
Post by: ndavey1 on January 01, 2021, 04:57:26 PM
Bit confused by this. What does RDMS do and what does LKS do that is different?
RDMS automatically steers the car back over the line if you go over it, while warning you about departing your lane.
LKAS is a useful feature that automatically steers within the lane, keeping you central. I use LKAS every journey and barely steer at all, letting the car steer for me (while also accelerating and braking for me, using ACC)
Title: Re: Honda Jazz Mk4 2020
Post by: Expatman on January 01, 2021, 05:55:44 PM
Several others have reported that LKAS is dangerous on country roads and in towns because it is too sensitive and can steer the car into danger - meeting a combine harvester on a country lane for example where you want to keep extremely close to the hedge but it forces you into the path of the harvester!
Title: Re: Honda Jazz Mk4 2020
Post by: Roman on January 07, 2021, 01:35:18 PM
I think that RDMS is the problem not the LKAS
And in car setting we have control of it`s sensitivity(Near, Normal, Far) if i not wrong
i remember that i set this to near and RDMS stears every second and because of our road quality after several atempts simple shutting down this function temporarely.
If this annoing there is 2 options
every tyme system power on push button with vehicle pictogramm in circle then disable RDMS from steering well
or changing in car settings sensitivity to Far from near or normal.
Title: Re: Honda Jazz Mk4 2020
Post by: Roman on January 07, 2021, 02:07:46 PM

As a reference but in our system less setings for RDMS
Title: Re: Honda Jazz Mk4 2020
Post by: TiJazz on January 09, 2021, 12:37:13 AM
My understanding is that if a turn signal is on, RDMS will not activate as it assumes you’re making a lane change, so perhaps signal when passing cyclists/tractors etc.

But yes, I agree it is half baked. A feature like this should either be elective (permanent off switch) or have awareness of objects as well as the lines.

LKAS on the other hand is excellent, as with most such systems these days.
Title: Re: Honda Jazz Mk4 2020
Post by: Kremmen on January 09, 2021, 03:50:40 AM
I think, like a lot of drivers here it seems, that I would rather make my own decisions.

For example I often drive at 'stupid o'clock' and if I have no vehicles behind me on the motorway and I pull out to overtake I don't indicate because there is no one to tell. The last thing I want is the car beeping away, vibrating the steering wheel or trying to keep me in lane.

I'm going to need a printed pre-flight checklist. I know from Civinfo that a lot turn off something to do with the handbrake system before setting out.


My Civic is due for service in a month and my intention was to take a Crosstar out on a test but I wonder if that's now possible with full lockdown.
Title: Re: Honda Jazz Mk4 2020
Post by: TiJazz on January 09, 2021, 02:33:57 PM
It’s been years since those of us with IAM qualifications passed their test - mine was back in 2007 for example - so things have probably changed with technology.

The fact is that cars now enforce turn signal use when changing lane, so I signal.

I think the point about checklists is valid though. My MG eZS had a bit of a process to switch on the limiter on start. Thankfully that’s easy on the Jazz (just hit RES) but I find switching between ACC and limiter a bit of a faff after joining or leaving a motorway:

Joining:
LIM until ACC indicator shows
Shift to D
Accelerate to speed then hit SET
LKAS ON

Leaving:
Brake tap to cancel ACC
LKAS OFF
Shift to B
LIM to limiter
RES to set limiter to previous ACC speed
Adjust limiter to minor road speed

In my Tesla, it was:

AP ON

AP OFF

;) I’m a software developer and flight sim Youtuber, so I like to think I’m familiar with such procedures, but if I find it a hassle I wonder how “normal people” deal with it?

I did teach my old man to use ACC, though. Not the limiter or LKAS mind, so it was a much easier process of “press SET at 70 then just tap brake to disengage”.
Title: Re: Honda Jazz Mk4 2020
Post by: Kremmen on January 11, 2021, 12:15:55 PM
My IAM was back in 1982, 5 years after my double deck PSV licence, taken at Chiswick under Police examiners.

I don't remember being told to indicate or not after an overtake because I don't remember overtaking in an old RT bus.  :)

We were taught to stick to the nearside (your bread & butter side) at all times where possible.

Title: Re: Honda Jazz Mk4 2020
Post by: TiJazz on January 11, 2021, 12:41:04 PM
On that note, it’s interesting that the LKAS on Jazz favours the near side of the lane. Most other systems favour the offside as they are built for LHD markets and the software isn’t adjusted for RHD. Being a Japanese car, the Jazz is naturally designed for RHD.
Title: Re: Honda Jazz Mk4 2020
Post by: gregoz on February 05, 2021, 01:49:29 PM
Waiting for tech specs..

Fuel consumption will be interesting given the new hybrid set up. My Mk3 is not great on fuel consumption although that is mostly down to short stop/start journeys in cold wet weather. I haven't seen 50 mpg as a long term average since my VW Golf TDI and that was a 2005 model.

I know one or two people who have the hybrid Yaris and that gets significantly better mpg than the Jazz in the urban environment. On the open road, much less so.

I'd be interested in a Mk4.

Hi Everyone, and welcome to the forum. This is what I will check first. So far 35 miles on the dashboard in total so I can't say anything. I will be updating…
Title: Re: Honda Jazz Mk4 2020
Post by: gregoz on February 05, 2021, 02:13:20 PM
But that is only available on the Crosstar.
True. Fortunately that's the version which most interests me as it claims to have a slightly higher ride height than the normal Jazz (one of the attractions of my current HR-V).
Actually, this is very firs think I’ve found out after getting in to Jazz MK4. Driver seat can be set lower than in model MK3, and actually I like this, I like to seat lower. First difference and first thumb up for me.
Title: Re: Honda Jazz Mk4 2020
Post by: Zaier on March 08, 2021, 10:17:58 AM
Just noticed yesterday while cleaning the car, that Jazz has rear feet vent, which helps a lot in heating the back passenger, a big thumb up as this feature is almost disappeared in the B segment.
Title: Re: Honda Jazz Mk4 2020
Post by: richardfrost on March 08, 2021, 03:17:53 PM
...which helps a lot in heating the back passenger...

For a moment I read that as back passage. My back passage has it's own hot air based heating system built in.
Title: Re: Honda Jazz Mk4 2020
Post by: Expatman on March 08, 2021, 03:18:49 PM
Whoopee!!!!
Title: Re: Honda Jazz Mk4 2020
Post by: Zaier on March 08, 2021, 03:29:47 PM
...which helps a lot in heating the back passenger...

For a moment I read that as back passage. My back passage has it's own hot air based heating system built in.
I'm sorry but English is not my mother tongue, so I couldn't catch this pun.
Title: Re: Honda Jazz Mk4 2020
Post by: ColinB on March 08, 2021, 06:04:40 PM
I'm sorry but English is not my mother tongue, so I couldn't catch this pun.

Your English is a whole lot better than my Italian!
Title: Re: Honda Jazz Mk4 2020
Post by: Jazzik on March 24, 2021, 12:48:54 PM
My understanding is that the new transmission is NOT a CVT but something completely different. I gather the driving experience will be more like that of an electric car most, if not all of which, have a single reduction gear.

In short they are claiming a significant technological advance from Toyota's system.
That's right, but it depends how you define the word "transmission".  There will be no mechanical gear ratio changes.

Long, long ago, questions about the Honda E-CVT appeared here. For those interested in this "transmission" I found this (long......) video "Understanding the Honda Hybrid E-Drive" by Professor John Kelly (WeberAuto).

Enjoy!

 
https://www.youtube.com/watch?v=QLUIExAnNcE&t=1s