Thread: Can Nanocom or other Diag unit change parameters in TD5 auto?

Take the selector out of D and use it in 3...

Fuel saving will be nothing at 80km/h anyhow.

Nanocom doesn't have that faciility. What sort of figures are you getting?

Originally Posted by Ricey

Nanocom doesn't have that faciility. What sort of figures are you getting?

Hi,
I do 70K return trip to work every day & average approx 11.5 litres per 100K.
Most of this run is at 80K. On highway, with cruise control set to 100KPH I average 9.5.
Motor is standard (no chip) with 170K on clock.

Cheers..Bruiser

I have a theory as to why the lockup is at 85Kmh, as it does this in a RRC V8, Disco V8 and as you say in your TD5 Disco.

In my RRC V8 the fuel cuts on overrun over approx 1500RPM and then is resumed under 1500RPM. I am assuming the TD5 does the same.

This relates to about 80KMH in my RRC in 4th and the gearing is similar in a TD5.
In an RRC I think they do the lockup at 85Kmh to avoid a large jerk if the fuel resumed at 1500RPM on overrun and the converter was locked as the rev difference between fuel cut off engaged and resumed is a couple of hundred revs cushioned by the TC.
If you had TC lockup the jerk would be quite significant and probably have people back at their dealers complaining.
Regards Philip A

Originally Posted by PhilipA

I have a theory as to why the lockup is at 85Kmh, as it does this in a RRC V8, Disco V8 and as you say in your TD5 Disco.

In my RRC V8 the fuel cuts on overrun over approx 1500RPM and then is resumed under 1500RPM. I am assuming the TD5 does the same.

This relates to about 80KMH in my RRC in 4th and the gearing is similar in a TD5.
In an RRC I think they do the lockup at 85Kmh to avoid a large jerk if the fuel resumed at 1500RPM on overrun and the converter was locked as the rev difference between fuel cut off engaged and resumed is a couple of hundred revs cushioned by the TC.
If you had TC lockup the jerk would be quite significant and probably have people back at their dealers complaining.
Regards Philip A

Phillip as much of my windy road driving, around 80km per day, 4 days a week is done at around 80km per hour, I find it very frustrating. I have a 1990 RRC. Is it posible to change this, so she locks up at a different speed. what is most economical.

Well, the 2HP22 in a 3.5 Range Rover AFAIR locked up at 76Kmh, so there should be parts available (governor?) to enable the same on a 4HP22.
There was some discussion on this about a month ago where someone enable lockup in 3rd.
I guess the trick is to find the auto shop who knows how to do it.

But as I said you may not like the resulting jerking as AFAIR the 3.5 does not have overrun fuel shutoff and it is probably the reason they changed the speed for lockup into 3.9 and subsequent .
ASHTRANS where are you when we need you???
Regards Philip A

The Disco2 does lockup in 3rd which is also what Tombie2 is saying.