EGT reading for engine shut-down

**Rurover** · 17th April 2014, 09:52 PM

I have recently fitted an Auberins EGT unit to my Defender 2.2 Puma, (with the sensor screwed into the large plug that's fitted adjacent to the turbo outlet).

I noticed that when towing a trailer the other day, the temperature got into the high 400 degrees C, so I reckon I might set the alarm at say 550 degrees.

Anyway, on a previous Defender (300 Tdi) I had a turbo-timer which could be set to switch off he engine after a pre-set delay to allow the hot turbo to cool down and wind down before the oil feed is shut off.

I now do this "manually" by just delaying my exit from the vehicle.
But the question is, how long do I need to wait before engine shut-down (obviously depends on how hard it's been drive and how hot the turbo is) and can I use the EGT gauge to determine when it's "safe" to turn off the engine?

I'm thinking (guessing really) that when the reading gets down to 250 degrees, then the turbo is "happy", but I'm keen to hear what others think.

Alan

**Tank** · 17th April 2014, 11:37 PM

400/550 degree temps are normal, when it is constantly up over 700's you should be wary, but not at 400 degrees. When you pull up, do all the things you normally do, open the door and turn the engine off, 10 to 15 seconds is all you need, any longer is a waste of fuel, BTW if your gauge is reading 550 degrees and that is as hot as it gets then you have the probe in the wrong place, Regards Frank.

**Dougal** · 18th April 2014, 05:33 AM

I think you need to move the probe to the exhaust manifold. Post turbo temps are pointless.

I shut down under 300c pre-turbo. Virtually never have to idle down.

**rick130** · 18th April 2014, 05:53 AM

Originally Posted by Dougal

I think you need to move the probe to the exhaust manifold. Post turbo temps are pointless.

I shut down under 300c pre-turbo. Virtually never have to idle down.

Ditto, although usually 270-280 for me, just a number I whipped out of my arse, no science behind it !

**uninformed** · 18th April 2014, 07:03 AM

Originally Posted by Dougal

I think you need to move the probe to the exhaust manifold. Post turbo temps are pointless.

I shut down under 300c pre-turbo. Virtually never have to idle down.

while not as good as pre turbo, certainly not pointless

**Dougal** · 18th April 2014, 08:08 AM

Originally Posted by uninformed

while not as good as pre turbo, certainly not pointless

With post turbo the harder the turbo is working, the cooler the reading. Pre turbo keeps climbing in the same situation.

**Rurover** · 18th April 2014, 08:25 AM

Thanks guys,

I'll continue to fiddle with the gauge and get a feel for what temperatures to expect, but it seems that if I shut down when the temperature falls below 250 C then I'm pretty safe.

Interested to read the comment that the temperature DECREASES as the turbo works harder if the probe is fitted post turbo!

Alan

**uninformed** · 18th April 2014, 12:05 PM

Originally Posted by Rurover

Thanks guys,

I'll continue to fiddle with the gauge and get a feel for what temperatures to expect, but it seems that if I shut down when the temperature falls below 250 C then I'm pretty safe.

Interested to read the comment that the temperature DECREASES as the turbo works harder if the probe is fitted post turbo!

Alan

I think what Dougal is saying is the harder the trubo works, the greater the difference between actual temp and read out of post turbo gauge.

I have never seen mine drop on acceleration or loading. My set up isnt as easy to install it pre turbo like a 300Tdi etc. I have used it as a guide and know there is a variable difference. It has also been helpful to determine engine related problems.

As good as pre turbo, NO!

Useless, No again.

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