Best rev range when driving long distance on tracks (Also, automatic converter lockers)

[Doug32 Member Find all posts View Profile Close Doug32]

Hi all. We are going to do a run along the Warburton-Rawlinna Track in the Prado D4D 150 Auto (2014) and given the current state of the track, speeds will vary between 20Kms to 70kms. Is there a good engine rev range I should try to stick too when using s1-4, not just for best fuel consumption but also to reduce wear and tear on the engine and auto trany? We will not be towing anything.

BTW, I read about after market converter lockers might be useful especially when towing but I thought that Prados came with one factory fitted. If not, are they worth getting?

[Daniel150 Member Find all posts View Profile Close Daniel150]

If not towing, D is best. The auto will do what it is designed to do, change gears for you and pick the best one based on load, speed and throttle position.

[carco Advanced Member Find all posts View Profile Close carco]

2014 so I guess it’s a 5-speed.
At those speeds it’s never going to reach converter lock if you stay in D. It will be constantly unlocked.
You can go to S4 and it will lock but although rpm will be higher, the engine won’t be working and you may find economy actually improves.
No the car doesn’t come with any trick converter lock up, just the factory design.
I have a Stocklock kit on my 5-speed.
Works great when towing or if pottering along at moderate speeds, dirt roads etc where the stock setup can’t decide to lock or not.
Probably not worth the expense unless you’re doing a lot of towing plus the ratio step 4 to 5 doesn’t sit as well as in the 6-speed, 4 to 5 to 6.
It will lock from 40kph in low mode and you can then drive it like a lazy man’s manual.

[Doug32 Member Find all posts View Profile Close Doug32]

Thanks Guys for your replies. Very useful indeed.