Thread: Exhaust Gas Temperature gauge

Originally Posted by Tombie

2.7 dont have built in EGT. I havent worried about fitting it (I did on all previous vehicles) as the tune remains well inside parameters.

Would be easy to add once the EGR piping is all removed. The blanking plates you are making up would make an ideal place to add a probe to the RH exhaust manifold.

Pretty sure this is where Dazza fits the probe on the 2.7 using a modified TD5 EGR blanking plate that can be made to fit.

Originally Posted by DiscoDB

Would be easy to add once the EGR piping is all removed. The blanking plates you are making up would make an ideal place to add a probe to the RH exhaust manifold.

Pretty sure this is where Dazza fits the probe on the 2.7 using a modified TD5 EGR blanking plate that can be made to fit.

I have plenty of plates ready if people are looking to do this....

I just havent had time to pull my vehicle apart

Originally Posted by rambada

Hi all,

Re Exhaust Gas Temperature gauge please

• Who runs one?
• Worth worrying about?
• Can the Gap diagnostics be used for this?
• If not, is there a bluetooth or app based version?

TIA

I have a Scanguage 2 and regretfully it doesn't give the opportunity to see EGT's on a D4. I'd like to see my EGT for interests sake more than any other reason.

However, if it's any help to you for your peace of mind, generally speaking, the best way of keeping your EGT down is to keep your revs "up", thus not having the situation whereby your foot on the accelerator is through the floor with the engine labouring in too high a gear and masses of unburnt fuel in the combustion chamber with detonation etc. etc.

Not so much an issue in a D3/4 as the ECU helps control such things by changing gear etc.

And pretty much the only occasion you'd likely have a high EGT in a vehicle is say towing under extreme load up hill under the conditions I mentioned, etc.

Originally Posted by Discodicky

I'd like to see my EGT for interests sake more than any other reason.

Same here,i have them on an Ultra guage,on the Tojo,just cos i can.
I am more interested in other parameters,and it displays heaps of them.

We dont tow,only time i have ever seen them in the 500's is in soft sand,slogging along,in very high ambients.But as others have said,once it is knocked back a gear,they come down.Same for auto pan fluid temps.
Up the Toowoomba bypass,locked in 5th,loaded,not towing,36 ambient,on the speed limit,they didnt get to 450.

I dont think monitoring them is important unless you do a lot of towing,particularly in high ambients,or the vehicle is tuned.
Or you just want to.

So I worked out that I can now use the Gap Diagnostics Live values for viewing these. Next question...

• There are 2 banks and several sensors. - Which sensors are better to use please, 1 or 2?
• What is an acceptable or unacceptable temperature?

Originally Posted by rambada

So I worked out that I can now use the Gap Diagnostics Live values for viewing these. Next question...

• There are 2 banks and several sensors. - Which sensors are better to use please, 1 or 2?
• What is an acceptable or unacceptable temperature?

If you were heading towards/or around 800 deg C for a long time it would be a good idea to change down a gear to get the revs up and temp down.
Depends on the composition of pistons/cyl head etc etc but over 1000 deg for a long time would not be nice.

Scarry's quoted temps are very interesting and about what I'd expect in a modern diesel engine in a vehicle.

As an example, if I was towing my 3.0T van up Toowoomba Hill in my 8 speed 3.0 litre D4, I would expect to be in 4th (maybe 3rd, its been some years since I went up in in my 2009 RRS TDV8 with my van, so memory of steepness not so good...) at around 2400 rpm and I'm sure the EGT would be fine.

Originally Posted by Discodicky

If you were heading towards/or around 800 deg C for a long time it would be a good idea to change down a gear to get the revs up and temp down.
Depends on the composition of pistons/cyl head etc etc but over 1000 deg for a long time would not be nice.

Scarry's quoted temps are very interesting and about what I'd expect in a modern diesel engine in a vehicle.

As an example, if I was towing my 3.0T van up Toowoomba Hill in my 8 speed 3.0 litre D4, I would expect to be in 4th (maybe 3rd, its been some years since I went up in in my 2009 RRS TDV8 with my van, so memory of steepness not so good...) at around 2400 rpm and I'm sure the EGT would be fine.

Gee i have never seen anything like those temps,but it could also depend on where the EGT sensors are located in the exhaust system.
i will have to find out.
Cruising at 100km/hr,they are usually around mid to high 300's,maybe just touching 400 on a hill,not towing.

I was talking about the newish Toowoomba bypass,it is still pretty steep,but much straighter and longer, with a speed limit of 90Km/hr,from memory.
The old road is still there,but i havent been on it for years.

Ok - ignorance about to show.

Why would the EGT drop if it was dropped down a gear? Wouldn't the increased revs/workload increase the temp? Or does the hot gas get blown out?

If the EGT drops with increased revs, then I assume this needs to be balanced out with coolant and transmission temps? Is this correct?