Gearbox Behaviour

[rocket rod]

One annoying thing with my MY16 D4 is how it doesn't select the correct gear when coming out of a corner. Say I'm going around a roundabout, when I accelerate out there is a hesitation and then the gearbox clicks back a cog and away we go but the change down gives me the irrits. I know it has to change gear but in all other situations it's fine. It's the only thing I can find a fault with the box. My questions is, as I have a service coming up soon should I ask for the gearbox to be reset so it can learn my style again or is it something to put up with. I have a remap by the guys at Jordon Rovertech in Perth which was said to improve the gear changes to make them smoother but I can't say I can feel the difference.

[LandyAndy]

Try using sport and a heavy right foot,you will soon re-train the gearbox.It learns from how you drive,so if you drive like an olde farte like I do there are instances where it will behave like an old slug when you want the mojo;););););););););)
Andrew

[rocket rod]

I've done 40k in it already, do I need to reset the box first???

[Graeme]

Clear the gearbox adaptations using your IIDtool.

[LRD414]

I don't think it's adaptations, sounds like standard behaviour. I get that hesitation too and similar from standstill as well.

It's well documented both here and on Disco3. There was a software update a few years ago that some reported improved things and some said no change but it was vin specific anyway.

Perhaps experiment with changing down early, on entry to roundabout, with paddles. It is also worse if you bury the accelerator too much at the wrong time, which takes time to figure out.

Cheers,
Scott

[Graeme]

Clearing adaptations might not help but as it only takes a moment to do if one owns a diagnostic tool with the capability then IMO do it before looking at anything else. Asking a dealer to do it when you can do it yourself may save money.

[BobD]

Since I got two new turbos mine is doing that really bad. If I bury the right foot to get it to change down I get a low turbo boost error and restricted performance, but it feels like a slightly worse version of what you have described before it errors.


Kevin has to fix it under warranty but no one is sure what is going on yet. If I clear the error with the IID tool it goes perfectly for a while until the next time it decides to not change down around a roundabout or similar. I will be taking it back for a fix next week.

[rocket rod]

Thanks for the replies. I too think it's just the way it is but I'll reset the box in the meantime and see what happens.

[letherm]

One other thing to consider is turbo lag, although in this case it may not be the issue. Near home there is a T intersection where as you come to the intersection to turn left (up the stem of the T) you have to slow down a lot as visibility to the right is bad. This is up hill and then turning up hill. Frequently the car has almost died for a couple of seconds when I have turned into the intersection. I have mentioned it a number of times to the dealer but am told it is the turbo spooling up and hence a lack of power. Not happy about it but as with the roundabout adjust my driving style and simply don't pull into the intersection if a car is coming within 5 kms:p:p.

Martin

[rocket rod]

Yep understand turbo lag but it's the shift down I can feel. It would be nice if the box just changed down gears for engine braking effect and be in the right one when you put ya foot down again.

[LRD414]

It does shift down better in Sport but that tee intersection example is the classic situation that it struggles with. For this situation I find that paddle shifting to the best gear early works quite well or I just take it easy and don't get too excited.

Cheers,
Scott

[LandyAndy]

Rod.
Do you use the paddles at all????
If not give them a go.1 touch on the - will give you the ground speed matched downchange you are chasing.Do nothing else and it will revert to D after a short time.Extra - will give you more but will remain in command shift,hold the + to return to D.
Will make sense when you play;);););););););););)
Andrew

[rocket rod]

I know how to use paddle shifts but I don't. Given I bought an auto I thought I'd leave it in auto thanks:D

[Chops]

One other thing to consider is turbo lag, although in this case it may not be the issue. Near home there is a T intersection where as you come to the intersection to turn left (up the stem of the T) you have to slow down a lot as visibility to the right is bad. This is up hill and then turning up hill. Frequently the car has almost died for a couple of seconds when I have turned into the intersection. I have mentioned it a number of times to the dealer but am told it is the turbo spooling up and hence a lack of power. Not happy about it but as with the roundabout adjust my driving style and simply don't pull into the intersection if a car is coming within 5 kms:p:p.

Martin

I was under the impression that the reason there's two turbo's to start with, was to deal with turbo lag and "keep it in the zone" so to speak.
I had an incident today where everyone came to a screeching halt in front of me, so when I'd almost stopped, I checked the lane beside me, and scooted out,,,, not :mad:. The car virtually stopped and propped before it decided to get going,,, but wow, when it did it did then move,,, :angel:

[LandyAndy]

Do you really mean it???? OK,look out here it comes:twisted::twisted::twisted::twisted::twisted: :twisted::twisted::twisted:
Andrew

[DiscoJeffster]

The transmission tries its best to be in the most appropriate gear but sometimes it just doesn't have time to change back to the right gear for your input. Other times, it's a gear behind as it's expecting a sedate driver who's happy to take off one gear higher and gently cruise off, using the torque, rather than warp factor 9. At the end of the day, it's programmed for a gentler driver, not Robbo driving his R8 wanting to do skiddies at every intersection [emoji3]

[LandyAndy]

My last loaner was a SE 3.0 with less than 1500ks on the clock,one of the demos.
When I got in it was like a rocketship,obviously as a demo it got punished a bit.
At the end of the day when I handed it back it drove just like mine.I told the service man(it was his drive) I retrained it and he should stop thrashing it.He laughed,told me you cant tell how a loaner is treated as soon as you get in after it comes back.
I don't thrash other peoples gear,treat it how I treat my own.I was impressed with the difference between SD and TD,out of warranty I would upgrade;););););););)
Andrew

[cjc_td5]

I find I can limit the "lag" by light use of the accelerator when starting from a standstill. With light use of the pedal the engine uses its torque to get going in the gear it wants. If a heavy right foot is used, then the computer thinks "oh the driver wants to go faster than I thought, so I had better down change", so you get the hesitation as it changes down, then the zoom.....

[LandyAndy]

After a TD5 D2 and a TD5 Deefer(both manual)I would never use the word lag to describe the D4 performance.If you want economy drive like an olde fart like I do,if you want go go,use sport and command shift.
Last year I had Tailslide Ron as a passenger,I was towing my HEAVY(2T) camper trailer,we got stuck behind a Hilux and camper trailer on a long hill.Was in sport,nailed it and away we went to get around the obstacle.Impressed Ron somewhat,he said his D2 V8 wouldn't have accelerated like that without the camper trailer:cool::cool::cool::cool::cool::cool::cool:
Andrew