Measuring Exhaust Gas Temperature

I would assume this would be for a 4wd application and a diesel engine so I'm not sure why the story about planes? Only thing I could get from this post is that be sure the engine is tuned correctly. Pretty standard stuff really.

Well Penchy just thought it might be of interest to illustrate how others use EGTs and the consequences. Air density is quite important for air-fuel ration. It is why if you care has been tuned at sea level and you drive up the mountains it may run a bit rough.

Terry,
Don't even bother replying to Mr P as the word troll comes to mind. Mr P never posts anything or gives answers. He just shoots the nets and sees what he catches.

Your reply was a good example of using egt gauges. The only difference from a petrol engine and a diesel is, diesels like lean running to keep egts down and petrols don't like to be leaned out.

Have a good one.

If you choose to label people with derogatory names to make yourself feel better, go for it. I've found there is no shortage of people on here that like to jump on the name calling band wagon when they see some one else do it. Bit like sheep I guess.

Sticking to the topic, I personally don't see the value in an EGT gauge. It's just another item measuring something you don't really need to know anyway. If you have a regularly tuned and serviced vehicle there shouldn't be a need for one. If your flogging the car through soft sand on a 40 degree day then of course the engine is going to be working hard, increasing egt. Have a bit of common sense behind the wheel and you wont need one and put the money towards a better accessory.

i dont think it was derogatory from P..
i think he just didnt get the message on the plane engine.
its all the same.
if the engine is getting worked, has load and youve got the foot to the floor, the engine temps will increase.
id find it far safer to put a EGT into the manifold, extractors than just rely on a stupid temp guage from the factory that isnt quite accurate.

you will see the EGT temps rise before any radiator guage will.

and some people thing, ooh just back off.. but sometimes its better to know exactly what your engine is doing than having a guess, ooh the temp guage on the dash is getting a little hot, well i feel thats too late !!

the EGT guage is soo much more accurate, and will tell you if your pushing too hard.

I agree With Rosco, unless you want to see the temp and have an alarm for preventative reasons the normal use with the already programmed ECU ( it knows what is happening through all the range of use) will control within safe limits, unless something goes wrong.

Your next problem is where you are going to install it. Pre turbo or Post turbo. Pre is into the manifold and Post is into the exhaust.
Temps in both positions with the same exhaust flow may show 150C to 200C lower after the turbo and so you should be aware of this when deciding what you expect to see and where you will position the probe.

Ross M

Another vote for Thermogard...been on for about 6 years.

Make that 3 for Thermogard


Cheers

Mark

Second vote for the Auber Instruments gauge. A quality unit at a good price and delivered promptly. It is a digital readout so the temperature changes constantly with the right foot effort. I consider it a valuable feedback to what is going on with the engine and I love it.
Regards

A dial gauge is easier to read when glancing at it, rather than having to decipher numbers which will be constantly changing with an EGT gauge. I DO like the idea of an alarm that I would set to 600°C and leave it all alone. I'd even go with a red light on the dash and a buzzer and dispense with the gauge altogether. Once the vehicle is modified and tuned to run in the safe zone most of the time, the EGT gauge is just something else to gaze at.

Tim

Difficult to decipher numbers at a glance for some maybe did you know cars have had digital speedometers since the 80's and they constantly change and yet there still making them today go figure. Of course an egt gauge will be constantly changing remember your only glancing at it not staring.

That's exactly right, you're not staring at it, so what does it matter whether the EGT is 456, or 465 degrees? You'll spend longer deciphering a digital than you will a dial gauge.

You're looking for a general indication for safety parameters, much like an oil pressure gauge or a water temp gauge. Are they commonly in digital? No
Do race car drivers commonly have digital gauges for their instruments? No.

You better catch up on your race cars because quite a few Nascars ,F1, V8 supercars, rally cars etc use digital readouts and have have done for quite a while I leave on that note.