Cam-Tech-Craig wrote:

Mikey wrote:

In light of these actual EGT readings, it seems prudent to quote myself from the previous page, just to remind ourselves...

Mikey wrote:

Cam-Tech-Craig wrote:

If you were running a race car into the pits then YES that statement is correct but ITS A TDi RANGE ROVER FFS! Who in there right mind is going to sit there and let the car tick over for 10 mins beginning & ending of every journey! Do RR owners not have better, more important things to do with their lives?

And we are not talking about 10 minutes of idling. We are talking 60-90 seconds

Nonsense! As that info states the temps take upto 15secs to reach acceptable levels after a 160kph “fast” run! It takes longer than 15secs to drive up most slip roads exiting motorways! Therefore negating the need to “rest” turbo’s on modern diesels.

Cam-Tech-Craig wrote:

Mikey wrote:

In light of these actual EGT readings, it seems prudent to quote myself from the previous page, just to remind ourselves...

Mikey wrote:

Cam-Tech-Craig wrote:

If you were running a race car into the pits then YES that statement is correct but ITS A TDi RANGE ROVER FFS! Who in there right mind is going to sit there and let the car tick over for 10 mins beginning & ending of every journey! Do RR owners not have better, more important things to do with their lives?

And we are not talking about 10 minutes of idling. We are talking 60-90 seconds

Nonsense! As that info states the temps take upto 15secs to reach acceptable levels after a 160kph “fast” run! It takes longer than 15secs to drive up most slip roads exiting motorways! Therefore negating the need to “rest” turbo’s on modern diesels.

So then Craig, do tell us

How long does it take for the cast manifolds and turbo body to cool down?

Just because the EGTs have dropped that quickly, doesn't mean the residual heat will drop that quickly. And it's the residual heat that does the damage

On the long road today with the wife driving so I have time to take measurements.
With the current setup (big cooler, coated manifolds,remapped for 610nm on the wheels) cruising at a steady 130kph

Took 2 minutes 40 seconds to cool down from about 350 to 200

Egt and cool down has long been talked about in turbos and I do subscribe to the idea of backing off on the last couple of miles to ease the turbo temps down.

That being said, going back to the original post, what is it that's causing the fails that are giving the 3.6 its reputation? An early comment was more likely the actuators failling.... Why are they failing? is it cause of heat soak after switch off or cause of heat build up during use?

If it's during use then cool down is a mute point possibly, and is there anything that could be done to assist cooling ( or heat dissipation) during use? Complete ransom thought but does the engine cover prevent cooling and promote hear buildup? V8 or else ...