Thread: Puma 2.2 Egt's

Originally Posted by 1nando

Tombie, hypothesis? Not correct??

Sorry for not replying. Laptop at office!

Close and yes they do have relationships and your experience is very positive. Certainly no need to worry..

Heat soak, environmental factors etc all need to be considered.. EGTs and AC for example are a function of load on the engine and thermal load in front of cooling system.

Heat soak, thermostat reaction times and temperatures all need to be factored in.

Originally Posted by Tombie

The old AULRO app is now defunct (see Daves posted sticky) - you'll need Tapatalk to move forward..

Yep, I had to uninstall the mobile app, search for and install Tapatalk, search in it for AULRO and log in. All good now.

Update;
Hi guys so yesterday i drove down to Melbourne. I am a little concerned with my coolant temp!.
So for the first half of the trip with an ambient 30 degrees for a good part of the trip i averaged 93-95 degrees coolant temp whilst doing 110kmph -120kmph. My egts are anywhere from 400-500 pre turbo to achieve this. The egts do not concern me in the slightest because i consider them low. However i managed a max egt yesterday of 598 (again not concerned at all as i was hammering the car up a long hill and this is still low) and the coolant temp managed to hit 100. I saw it climbing and thought id keep hammering the go fast pedal just to see where it would stop. As soon as i back off it comes down quickly but still, nt good.
So this is what i was able to see with egt in regards to coolant temp.
400-450 =91-93 degrees
450-500 = 93-95
500-550 = 95-97
550-600 = 97-100

Now, i know some puma owners have experienced limp mode when heavily loaded/towing and pushing hard. I also think the 2.2 tdci goes into limp mode at around 105 degrees (someone confrim?). If this is the case i would imagine that to hit 105 degree coolant temp the egts must be around 700 degrees and the engine kills power to protect itself.
I only hit a 100 a few times and to be honest i could have avoided it quiet easily however it is worrying to know that the temp can just skyrocket like that whilst running low and very safe egts. I also know modern diesels are engineered to run hot and in fact need to run hot to run effieciently, howwever i think 100 degrees is over the top.

Any thoughts gents? Im considering a earlier opening therostat.

At 15Psi coolant pressure running 50:50 glycol equivalent
Your coolant boil point is 135degrees Celsius
Sure you might get more cavitation boiling at lower temps than 135
But the factory limp at 105 is still relatively conservative

I was going to comment that heat soak (hwy trip like you just showed) will always out temp pushing hard around town

I think you are simply defining the numbers to a well tuned diesel

S

Roverrescue, so you think i have nothing to worry about?

I think the ECU starts protection mode at coolant temps around 116C. I have had mine as high as 109C according to the Ultraguage while towing the camper and traffic requirements meaning I had to maintain road speed rather than letting speed wash off so was pushing. Ambient at 30C, towing and travelling between 95 to 105 KPH sees coolant temps varying between 92 to 96C whereas without the camper behind I get 89 to 92C in the same conditions. Obviously working harder pulling the camper, and the temps are higher than I would like but I don't think that there is anything to be done about when you are pushing. MY2012 Defender 90 with the 170hp BAS tune and Allisport intercooler.

Yes
100 degrees is of little consequence when your boil point is 135
If the system is intact as in no HG leak hoses sealed and radiator clear of obstruction the 100 will quickly cool once load reduces

As you mentioned engine load has more bearing on coolant temps than EGT

Go up a hill flat to the boards in 6th your load will be higher than if you did it in 5th
Coolant temp would be higher in 6th than 5th

I would be hesitant to run a lower rated stat which would run the engine cooler most of the time

100 is not hot

S

Who told people 100c isn't good?