EGT upper limit?

Submitted: Saturday, Feb 04, 2012 at 20:06
ThreadID: 91664 Views:8500 Replies:8 FollowUps:1
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I have a Land Cruiser 4.5 TD V8 ( VDJ79R ) with a Tunit chip fitted...been all ok since installed some 2 years ago

Now that I have a 3.5 ton caravan to two at times I am more aware of the exhaust gas temp. I have on order an EGT guage and seeking what sort of temp limit I should set the alarm at so as to know when to back off immediately before any damage is done

So can anyone advise the sensible alarm upper limit please and comment on the expected / ideal temperature ranges

Thanks
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Reply By: Member - John - Saturday, Feb 04, 2012 at 21:03

Saturday, Feb 04, 2012 at 21:03
G'day, depends on where the probe is going, pre or post turbo and also units of measurement.

Mine, post turbo and in degrees F is colour coded green till 900, yellow to about 1050, red from then on..............

Hope this helps.



Isspro EGT
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Reply By: Mick O - Saturday, Feb 04, 2012 at 23:11

Saturday, Feb 04, 2012 at 23:11
When I had the chip and exhaust fitted to the 79 ute, the specialist indicated that 520C was not what you wanted to see on your EGT gauge. My probe is aft of the turbo meaning that things are well over 100C hotter in the engine than what the probe is picking up.

When tuning on the dyno, he aimed for a setting that would not exceed 480C despite load. I have managed to reach that on a couple of occassions. (Wrote it up in the blog with the Dyno results - last couple of paragraphs)

Ute Build

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Reply By: Member - Tony H (touring oz) - Sunday, Feb 05, 2012 at 00:58

Sunday, Feb 05, 2012 at 00:58
Lots & lots about EGT's, types of guages, placement of sensors & operating temps on www.lcool.org (200 series section) free to join but you have to register
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Reply By: Ozhumvee - Sunday, Feb 05, 2012 at 07:54

Sunday, Feb 05, 2012 at 07:54
You really have to do a search for what your particular engine can tolerate.
As others have said it also depends on where the probe is situated in the exhaust.
I've done absolutely nothing to the Oka and EGT's typically run up to 630 deg C when working hard, that is approx 100mm post turbo so as Mick said it is probably at least 100 deg C hotter in the engine.
That is with standard everything so I assume it is ok as I've yet to find a definative answer for the Perkins engine.
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Reply By: Member - Captain (WA) - Sunday, Feb 05, 2012 at 12:03

Sunday, Feb 05, 2012 at 12:03
Hi Bungarra,

I have an EGT guage post-turbo on my 200. The highest temperature I have seen is 571C, that was towing my 2T van and going up a long hill and overtaking too with full acceleration for longer than a minute. The temp was still very slowing climbing, but I backed off at this point. So, I am comfortable that the 200 can handle ~570C for short bursts, its what it will do from the factory. I would estimate the 79 series would be very similair in what it could handle.

Since that measurement, I have fitted a Beaudesert Exhaust and it drops the EGT by up to 50C. I have not yet seen what the max EGT gets to with the new exhaust (by towing up a hill with full acceleration).

I also have a ChipIt chip. I can turn mine off/on as I drive and the 571C was recorded with the Chip off. Typically, the Chip adds 30C to the EGT under any condition. The ChipIt connects to my EGT guage and will automatically change the Chip program back to standard if the EGT high alarm is reached, I have mine set at 565C.

Prior to the new exhaust, on a few occassions the max temp alarm when off, but since the new exhaust this hasn't happened due to the lowering of the EGT.

Cheers

Captain
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Reply By: Member - Chris & Debbie (QLD) - Sunday, Feb 05, 2012 at 12:40

Sunday, Feb 05, 2012 at 12:40
Hi bungarra,
Not sure where people are getting the 100 degC drop across the turbo as the normally agreed upon value is 200 degC. It can be anywhere between these two figures but 200 will give you a bit of a safety margin.
Normally the max you would want to see pre-turbo, which is where I always put the probe, is 720 degC therefore the max post turbo should be 520-550 degC. The prob should not be fittied any further than 100mm from the turbo outlet.
Chris
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Follow Up By: Isuzumu - Sunday, Feb 05, 2012 at 16:02

Sunday, Feb 05, 2012 at 16:02
This is correct, Ian from Thermoguard was in the area and delivered mine to me himself and told me that there would be a 200 degC difference if it was put post turbo. Mine is situated in the manifold and I do not let it get over 700 degC.
Cheers Bruce
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Reply By: Dust-Devil - Sunday, Feb 05, 2012 at 13:55

Sunday, Feb 05, 2012 at 13:55
This is better than watching the Cricket or Tennis.

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Reply By: Member - bungarra (WA) - Sunday, Feb 05, 2012 at 16:48

Sunday, Feb 05, 2012 at 16:48
Thanks to all those that replied.

I now have some idea where to set the upper and will be very interesting when I install to see where I have been driving at ..albiet...blindly
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