Auto box "surprise"

[mh007]

I have a Rover 45 2.0KV6 Conn Auto with the Jatco 5spd box & that is Tiptronic.

Of course you have P,R,N & D as the main selections & then move the selector to the right for Tiptronic/Sport mode as already said.

The 'Snow' function is on a separate button up on the dash.

On the R75/ZT, it's the same box but the selections are all in a row on the main selector panel & the switch for Sport/Snow just to the side so it's all the same really.

I reckon that little selector panel would have looked lost in a 75/ZT with just P,R,N & D !!

I kind of wonder why you would want to change it when you can still use the box 'manually' to a degree ?

[DEVYL]

Wait a sec, you can change from D->4->3->2 while the car is moving and nothing bad happens? I've read the owner book and it doesn't say anything about being able to do this while moving so..I didn't try. It say that the gears are limited to 4/3/2 gear. Some friends told me "hey 'cause u don't have tiptronic you can downshift manually via selector gear" but I didn't trust them , I was afraid not to brake something

[FezzyFox]

Originally Posted by DEVYL

Wait a sec, you can change from D->4->3->2 while the car is moving and nothing bad happens? I've read the owner book and it doesn't say anything about being able to do this while moving so..I didn't try. It say that the gears are limited to 4/3/2 gear. Some friends told me "hey 'cause u don't have tiptronic you can downshift manually via selector gear" but I didn't trust them , I was afraid not to brake something

I occasionally drop down using the 4-3-2 while driving along. All it does is tells the box to shift down, but it wont change up higher than the gear you select. meaning you can, if you want, take it to the redline in that gear.

However, there's rarely any need for this, as clicking into Sport mode makes use of all the available power in the rev-range through every gear, without taking the RPM's higher than you need to.

i only use 4-3-2 for coasting down hill. but even in 'D' it does this for you when free-wheeling down hill

[rrobson]

There isn't the mechanical part on the selector to make this work. Neither is the ecu set up to accommodate trip tonic selection.

The gearbox is also different because when you move the selector it physically moves bits in the gearbox.

To make it work, you'd need a selector, ecu and gearbox from a freelander, then somehow graft the selector and ecu into the 75.

Even though the gearboxes are 'the same' they are in fact different in how the gears are selected.

[clf]

Originally Posted by DEVYL

Ok so 1st of all I couldn't find a topic where I can post something and an user will reply without making a new topic around here. Second of all my gearbox is fine ( both of them ) , another thing made me wonder. When I bought my 75, I was looking on google on common/possible problems with the autobox,and found some other 3-4 brands which use the same gearbox, funny all of them had tiptronic option, except the 75. I thought at the time that the tiptronic option is not something you achieve it via reley switches or electrical mods, it needs to be manufactured by the producer of the gearbox; wondering a couple of days why the 75 didn't had tiptronic UNTIL a couple of weeks ago a friend of mine with an manual R75 wanted to convert it to automatic r75, job done in ~10 days, car is working like a factory automatic but in the last day of swaping I went by the garage and see something that made me See the picture. What the hell?

i may be wrong here, I think the cut is for the wiring for selection indicator, or the sports/snow switch?

[Jim Jamieson]

Why would you want tiptronic, if you want more control over the gears buy a manual.
As for slowing down just by pressing the brake lightly on a downhill will engage the autobox to brake through the gears for you.
It works great on my V6 but not so evident on the diesel (both autos)

[clf]

Originally Posted by Jim Jamieson

Why would you want tiptronic, if you want more control over the gears buy a manual.
As for slowing down just by pressing the brake lightly on a downhill will engage the autobox to brake through the gears for you.
It works great on my V6 but not so evident on the diesel (both autos)

Control over the gears without the effort of a clutch,or worry lol. Full Auto for sitting in traffic,which I do every morning, and tip for economy or power at your fingertips.

I know they can be problematic themselves. Personally I used to hate autos,but loving it now,except for the economy. Not so much the cost overall,but more the principle I lose nearly 20% over the same engined manual. Tiptronic would be,I think the ideal compromise.

[James.uk]

>>>by pressing the brake lightly on a downhill will engage the autobox to brake through the gears for you.<<<

That's not how my cars gearbox behaves??? In my car (Jatco auto) I have to manually change down to get any engine braking worth mentioning. I would have to brake hard enuff to drop my speed down a lot in order for the car to change down, same as on the flat.

Changing down manually only works if you are within the right rev range for the gear you choose, otherwise the box ignores the command to protect itself.

Nothing happens if you select reverse by mistake when traveling forward either, for the same reason.
...

[kaiser]

are you sure, I don't think I would take a chance!



As for the gearbox generally, the main problem is the long time the box needs to change. I can't understand what is causing the long delay from one gear to another. Even in sport mode.
A friend of mine took me out in his Subaru Forrester, with a 2.5 liter engine. The autobox is seamless (well not quite, it still has distinctive gears) and changes like "pop" every time. The engine has torque and the car flies. Miles better than the Rover V6 I'm afraid to say.

And, I must hasten to add, even though the gearshift is very quick in the Subaru, there is no jolt and no harshness about it. It is just so much better, seamless, fast, efficient, fluid --- perfect.

[Jim Jamieson]

Originally Posted by James.uk

>>>by pressing the brake lightly on a downhill will engage the autobox to brake through the gears for you.<<<

That's not how my cars gearbox behaves??? In my car (Jatco auto) I have to manually change down to get any engine braking worth mentioning. I would have to brake hard enuff to drop my speed down a lot in order for the car to change down, same as on the flat.

Changing down manually only works if you are within the right rev range for the gear you choose, otherwise the box ignores the command to protect itself.

Nothing happens if you select reverse by mistake when traveling forward either, for the same reason.
...

You won't notice it with the diesel but with the V6 petrol it will brake through the gears very well, sometime too much and you have to touch the throttle again to release the auto braking.

After driving the diesel auto for 8 years before I added the V6 it caught me out quite a bit and wondered if something was wrong but the handbook says it will brake if brake pedal is depressed lightly which it does.