I think you are imagining an extreme situation and not looking at this in reality.
For example, someone else said that the oil pressure would be lower and that would damage the engine.
But I can drive now at 40mph at the same approximate revs as I will have at 50mph with the changed diffs and my engine has plenty of oil pressure at those RPM.
It might be 5% less oil pressure than normal which will be way inside what is required.
I think that you people are imagining things at an extreme to make an irrelevant point.
How much higher cylinder pressure would there be?
Do you have a way to calculate that?
How much extra wear would there be?
Lugging might happen if I was driving at 20mph in 5th gear, with the throttle wide open, but that will not be happening.
Given the low down torque of my engine, and the VANOS system, driving at 1,500 versus 1,900 at 70mph will not cause lugging.
The 6 speed L322 will do about 1,900 RPM at 70mph and the 8 speed L322 will do about 1,400 RPM at 70mph.
Why would Range Rover lower that RPM if there are so many issues with doing that?
Your comment only makes sense if I was loading up my car with a heavy trailer, but I am running it very light, as mentioned already.
Therefore the engine will be operating at the least weight end of the scale that it has been designed to run at, and it will easily handle the load of that weight at a lower RPM.
All of this has been explained by me already.
If I was driving a high revving 4 cylinder engine with a huge load at a low RPM in a high gear with the throttle fully open then I could accept your comment.
That is not the case at all, as my engine has a lot of low down torque.
This is just like someone who changes up gears early in a manual car because they do not need to squeeze that last bit of acceleration out of the car.
In normal operations this puts less stress on the engine.
Likewise, holding a car in lower gears longer than needed puts more stress on an engine.
In an extreme example there could be issues, but they typically come when the throttle is wide open, which is nowhere near where I will be in my modified L322.
As someone said on another forum, they knew someone who did something similar and they had no issues, just a reduction in their acceleration, which I do not care about.
