Thread: Do I need a replacement performance radiator?

My god , if that has an indoor swimming pool , you could plumb in a heat exchanger to heat it via the poor old disco
But if the rest of the cooling system is tip top , an 82 degree thermostat will give you some leeway , all the other stuff previously mentioned, is valid, fwiw ,I recently towed another d2 on a car trailer between bussleton and Albany on a 32 degree day and you know what the hills are like between , highest temp recorded was 91 degrees, this also has a tune , but when I know a hill is coming it's dropped in to 3rd lockup.
Also when low speed towing eg leach hwy , hot day because of the low stall it means your fan won't be spinning as fast out of lock up as it normally would , so until you get your manual override it might pay to use the gears to keep the revs up to pull the air through

Not as big as it looks from taking a rear pic - its only a 20 footer after all - but does present a big front.
I was in 3rd Sport driving along Leach H'way, but as Blknight says, with the bigger tyres not necessarily locked, remembering as you know that although I have a spped adjuster, its wheel speed that is read by the BCU to calculate lockup parameters. In my case for 4th lockup its 89 kmph - up from 80. 3rd lockup I never thought of checking before fitting the new tyres.
So yes hoping the lockup over-ride will help.

On the other hand, being facetious, if the oversize ATF cooler is doing its job, and there is still some slippage, the higher revs should aid with cooling the heat being created! Bit like a reverse perpetual motion.

I may have a lead. My EGTs are climbing! A normal, quiet acceleration up to 70 on the same rolling hills part of Leach H'way with no van = 450 degrees+. That's much too high.

while you're accelerating, thats acceptableish. if its sitting there while you're holding speed you're in trouble.


that said...

I can sit and hold 100KPH on the flat at 450 EGT

Free flow exhaust? enough boost?, map tune catered for low stall ,big tyres?

Thermostat won't change anything as everything is heat soaked anyway, it will only delay the inevitable by a small amount of time.

Defender TC gearing is too low, unless you went to 33's (Defenders are geared lower than Discoverys, even after accounting for tyre size). I've run all the calculations. 3.75 or 3.90 diff gears are what you need (depending if you want to be slightly higher or very slightly lower than stock...). I even spoke to Dave Ashcroft about making a 1.3## high range, but he doesn't think there's a big enough market...

Where is your EGT probe? Td5's run hot... especially if measured pre turbo, mine seems perfectly safe to sit in the low 600's on hills. Oil and compression tests confirm this. It is measured in front of number 1 exhaust port. But I think part of the reading is the flame artificially heating the probe to beyond the gas temperature. It's done 50,000km over 16 months set up like this. And it's fair share of towing. Yes I would like to cool it down, but it's coping well...

Originally Posted by discorevy

Free flow exhaust? enough boost?, map tune catered for low stall ,big tyres?

Ta. All on the list to discuss with DazzaTD5

Originally Posted by MR LR

But I think part of the reading is the flame artificially heating the probe to beyond the gas temperature.

If you've got flames coming out past the exhaust valves on a td5 then either a, somethings wrong, b, its hugely overboosted and fueled. and if you had flames coming out the exhaust valves, hitting the probe and you were only showing around 600 degrees your calibrations out, Id be expecting to see easily past 900.

650 is your max safe sustainable EGT temperature (assuming the cooling system deals with the heat load)