[JFF45]

I fitted a similar cheap eBay IC when I did my TD42T conversion in 2015 and I’ve never had a problem with it nor with EGTs.
I have a Panasonic fan under it and a Jaycar 50C temp switch on the IC that activates the fan but it does run most of the time in Summer. I have an override switch in the cabin and a LED to show when it’s on.

I fitted an eBay “Navara” style scoop for mine.

 

[JFF45]

What sort of egt's were you seeing pre and post install (cruising/max)?

There was no pre-installation. It was fitted when I did the conversion. Max I’ve seen pulling 2.7t caravan up a hill was 450C but I backed off when engine temps got to 115C.
Rarely see over 300 driving normally.. I don’t flog it.

 

[JFF45]

That's impressive considering you're towing 2.7 tonnes.

I'm running the stock intercooler and about 16 psi on the stock turbo on what might not be the greatest tune. Max I've seen is 537 degrees very briefly absolutely giving it uphill.

So if I can get my set up to the point where I'm seeing Max 450 up a long hill (in summer) towing near 2.5t between 80-100km/h that's a win in my books.

It might have gone higher but I backed off because of engine temps. It was a one time test when I had the Patrol fully loaded to 3.5t and the caravan slightly overloaded with 200 kgs water.
We did 6200 kms to Lorella Springs and back.