EGT temp

Submitted: Friday, Nov 17, 2017 at 14:00
ThreadID: 135878 Views:3776 Replies:6 FollowUps:1
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Hi all
with all the modern technology in diesel engines around today, and the many accessories available I am wondering what your average EGT temp is on your vehicle.
And what motor it is that you are monitoring ?
After fitting one to my HDT FTE am finding much difficulty to find an average.
Many factors to consider I know, but more of an average at highway speed on reasonably flat road is sure to give a good indication.
I am aware of pre and post turbo on the installation and difference can be as much as 200 c , and also weight factors, but more of a curiosity thing.
Thanks in advance
Cheers & Regards
Flighty

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Reply By: Rangiephil - Friday, Nov 17, 2017 at 15:34

Friday, Nov 17, 2017 at 15:34
I think really that you should perhaps confine your question to 1HD FTE's because there are great differences in turbo EGTs depending on the type of motor , intercooler size, boost level, EGR or delete, performance exhaust or not etc, let alone pre or post turbo and whether the manifold is ceramic coated.

OK I will be the mug and say for my D2 TD5 which has unitary injectors rather than common rail at highway speed I am running about 5-8lb boost and about 300C measured just before the turbo in a ceramic coated manifold inside and out.

This can increase to 21lb boost and 700C towing on a step hill.
AnswerID: 615046

Reply By: catmandoo - Friday, Nov 17, 2017 at 15:50

Friday, Nov 17, 2017 at 15:50
Flighty,

Nissan TD42 with Denco Turbo, 2.5" Mandrel exhaust, otherwise stock.

After turbo sensor, 300c at 110 kph on freeway. 400c at 90 kph towing 2.5 tonne caravan on the flat. Don't go above 500c for any long period although have had up to 550c on hilly terrain for short bursts.

This is in ambient temp of around 22 degrees c

AnswerID: 615047

Reply By: William P - Friday, Nov 17, 2017 at 16:44

Friday, Nov 17, 2017 at 16:44
I dont need to monitor my Landrover EGTs - my ECU does this and if they get too high the ECU changes the tune to reduce them - easy peasy.
AnswerID: 615049

Follow Up By: RMD - Friday, Nov 17, 2017 at 17:37

Friday, Nov 17, 2017 at 17:37
William
Does your engine and ECU have an EGT sensor in the exhaust?

If it does not have that EGT sensor probe, then the ECU isn't sensing the exhaust temp at all and is simply running to a ECU Map regime which doesn't cause the exhaust temp to go too high.

So one is EGt control through monitoring and the other situation is operating to set parameters, ie designed that way.

One using feedback the other just following instructions.

The IDEA of an EGT gauge is so you can see the EGT if and when the ECU parameters go "worng".
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FollowupID: 885820

Reply By: Drew - Karratha - Friday, Nov 17, 2017 at 22:53

Friday, Nov 17, 2017 at 22:53
1988 hj61 Landcruiser with the 12ht factory turbo, 3 inch straight through exhaust, 5speed manual, 31 inch a/t tyres, boost set to max 11.5psi, and egt probe in dump pipe about 50mm from turbo...
(All relevant info...)
I see 300 - 350 at 100 - 110km/hr. Ihave set the Redarc gauge alarm to sound at 550, which I have seen in summer 1) when towing my boat to Exmouth in 40+ temp, and 2) pushing it up Roelands hill near Collie in W.A. to see what temp I could get it to....
I would be more interested in coolant temp... I have the probe in between the thermostat and top radiator outlet - see about 86 - 88 in normal driving, and have the Redarc alarm set to 94. Again I have seen these in the same 2 situations as above.... I try to drive to keep the egt below 500 and the coolant below 90 - but it is hard when the ambient temp is above 40...thinking about setting up a windscreen washer system to spray the radiator - just to see if it makes a difference...
AnswerID: 615053

Reply By: pop2jocem - Saturday, Nov 18, 2017 at 11:55

Saturday, Nov 18, 2017 at 11:55
I now have a new towmobile about to take up van towing duties for our next trip, so these are the figures for the now retired HJ75 fitted with a 1HD-FT (non electronic version of the 1HD-FTE), manual 5 speed.
Van is 22' full height, 2800 kg ATM, vehicle usually close to the same weight loaded.

No intercooler, never seemed to be in need.
Heavy duty 3 row core radiator with the air con condenser mounted on the roof to take the added heat load off the engine cooling system.
Turbo boost maxed at 12 psi, fuel settings standard.
Gauge sender mounted post turbo, 50 mm approx after turbo outlet.
Flat road 4th gear around 350 C at 85 to 90 kph, ambient temps low 30s.
Depending on gradient, rising to 500 C to 550 C when I usually down shift if required which generally drops the exhaust temp to around 400 to 450 C.
Water temp usually sits on around 85 to 87 C rising to around 95 if ambients creep into the low 40s. Never seen the water temp rise above about 98 regardless.
No idea about exhaust temps not towing as that vehicle was usually doing tow duties and little around town or free running stuff unless local exploring. The only longish trip was the GRR 3 years ago with just the camper on the back and June/July so ambients pretty much high to middle 20s.

Cheers
Pop

AnswerID: 615058

Reply By: Grant Tas - Tuesday, Nov 21, 2017 at 23:40

Tuesday, Nov 21, 2017 at 23:40
Hi Flighty
I have the HDT- FTE engine in my Cruiser and a EGT gauge.
Around town it normally does not move
On the highway doing 110 ks might go to 250
I tow a caravan 2.8 ton siting around the 90 ks , the gauge is around 300 to 400.
Going up steep hills it climbs to 500 to 600 depends on how hard I push it.
The boost and EGT are my way of not over pushing the engine
Hope this helps
Grant

AnswerID: 615145

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