Want to learn more about EGT’s? Watch this | Exhaust Gas Temperatures [#TECHTALK]

Are you running EGT sensors? Do you know which ones to use and how to set them up?

In this weeks [TECH TALK], Andre dives into the world of EGT Sensors, their operating principles, the data they can provide us, and some tips and tricks with them along the way. First covered is what EGT’s do and a brief history of them. Then we move onto the operating principles and some things to consider around using EGT’s. Andre walks us through a couple of different EGT sensor types, their pro’s and con’s and also the use of thermocouple amplifiers to manage multiple EGT sensor inputs to your ECU. After that, we dive into some data from our GT86 shop car, how important EGT sensors' location is, and how you can use EGT sensors to locate a misfire quickly.

00:00 - Intro
00:23 - What EGT’s do
00:35 - A Bit of History
00:55 - A Common Issue
02:04 - The Principle of Operation
02:29 - Some things to Consider
03:27 - Comparing EGT Sensors
06:17 - Further into the Operating Principles
08:45 - Implications of Some of These Principles
09:32 - Thermocouple Amplifiers
12:09 - Let’s Look at Some Data
15:28 - Location, Location, Location
16:50 - A Useful trick to locate Misfire’s
17:38 - Outro

#highperformanceacademy #learntotune #enginebuilding101 #dontletthesmokeout #wiring101 #egt #exhaustgastemperature #sensors

[thatniceguynick]

Also very good for identifying a problem that has popped up on a single cylinder before it goes boom.

[KHIJAPAN]

You are right spot on! Exactly what I was looking for.

[mikeschaner]

Now this is quality info... Never thought about running these in my b14 sr20vet swap, but after seeing your troubles with the sr86, I'm definitely getting some.. Greatly appreciate all the documentation you're doing. Great show guys..

[mr.know_it_all]

Individual EGTs was one of my favorite purchases..I found an injector problem at high fuel/boost pressures (low EGT ) I didn’t even know I had.

Now I’m pretty excited about my REModule purchase.

[ToysLife]

Excellent video - thanks for the education about EGT's!!

[maxtorque]

The main point to understand is that your are NOT measuring the temperature of the exhaust gas, but the average temperature of the end of the Thermocouple! Because reciprocating combustion engines are not a continuous process, the exhaust gas is not continuously flowing past the sensor, it is actually stopping and starting (it obviously only flows when the exhaust valve is open!). This means the figure you see is the time average temperature that is the result of the total heat flus into, and out of the sensor itself, damped by the thermal inertia of that sensor.

Luckily, we don't actually care about the temperature of the gas, because what we care about is metal temperatures in the exhaust line, ie the turbocharger turbine for example, and these also reach a temperature that is a time average of their heat in and heat out balance (and this is not the same as for the sensor because both the thermal gradients and the thermal impedance is different)

For example, whilst you might try to keep your measured EGT below say 1, 050 degC, actual peak exhaust gas temperature will be significantly higer, perhaps as high as 1, 800 degC, but that peak temperature exists for such a short pulse as to not have time to heat up critical exhaust line components much beyond the temeprature measured by the sensor (the 1, 000 degC)

At OE development level, we use material analysis and correlation to link our measured EGT from the sensor to the actual average bulk temperature of critical exhaust line components, in that way we can draw up limit values that are directly relevant to the engine and measurement characteristic in question. For example, we will run a turbo charegr at a measured 1, 000 degC for a few hours, and then section the turbine wheel and use metalic crytalline analysis to estimate the average temperature at which that turbine ran, and hence be able to correlate the necessary measurement limit temperatures comensurate with typical duty cycles and safety factors!

[josephschaefer]

Pointing an infrared temp gun at the exhaust runners is the fastest way to pinpoint a misfire for those of us who don't have egt data

[jnrgomes]

so using both the egt sensor and four wideband sensor will give you the best results ?

[cetGT]

Im using Koso egt’s on each runner placed 13cm from port opening as advised by manufacturer and there are still variations of 50- 100* but it evens out at high gas flow speeds.

[AnthonySamuel-ruff]

Do EGT's matter on a gas car? I have a subaru outback that came with an EGT I can read from my OBD and this temperature can sit pretty high when I am on the highway in the summertime. Like 1450F and if I am really on the pedal it can get up to 1600F. Everyone talks about EGT for diesel but does it also matter for a regular car? Thanks

[mr_mike]

Had an egt sensor break on me once. Sucked into motor and ruined a few pistons and valve seats.

Not sure why it broke apart. Only thing I can think of is it was slightly touching the other side of Ext runner.

[Smith]

I’ve just changed my lambda sensor and the mechanic advise me to change the exhaust gas temperature sensor as well 😅
My car is running smoove very,
do i really need to change it😉

[TIMTIM-xmpr]

You know how much is the different from temp if i put it on turbo manifold?

[jeremymadeley]

What impact does shortening the tc lead?

[matthewmorriss]

Do you know of any control mondules that can handle 6 sensors? Not high end stuff more mid range. Cheers

[bernhardlist]

it all sounds nice but wow would you install the Haltech TC8 without data and CAN id. Haltech is making a big secret out of it. Junk.
I do have 2 WB2s from Haltec and even that I have the IDs now they still display a bad CAN signal on my Picoscope while at the same time and same CAN bus my ECUmaster EGT amp works great and has a clean signal on the same bus.