where exactly do i tap into to put the egt sensor? i heard after the turbo on the downpipe but i need a deffinite answer. can someone please show me a pic? how much does it cost to get a shop to drill that little hole?
where do i put egt sensor?
- Thread starter MP3Architect
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1-3" after the turbo in the downpipe
Actually shouldn't it be 1-3" away from the head in the #2 or 3 runner of your exhaust manifold?
If you put it after the turbo you're not seeing the actual temperature, it's reduced by the time it passes through the turbo. Maybe not much, but if you're trying to tune you need a relable reading. That's also why you want it in the exhaust manifold #2/3 runner. The middle cylinders will run hotter so those are what you'll want to look at. An EGT in the downpipe will give you an average EGT of all 4 cylinders plus be reduced by the distance from the head. Beau, sounds like you thought he said WB 02 sensor.
Put a WB 02 after the turbo, in the downpipe and tune using an average A/F reading and a single cylinder EGT.
If you put it after the turbo you're not seeing the actual temperature, it's reduced by the time it passes through the turbo. Maybe not much, but if you're trying to tune you need a relable reading. That's also why you want it in the exhaust manifold #2/3 runner. The middle cylinders will run hotter so those are what you'll want to look at. An EGT in the downpipe will give you an average EGT of all 4 cylinders plus be reduced by the distance from the head. Beau, sounds like you thought he said WB 02 sensor.
Put a WB 02 after the turbo, in the downpipe and tune using an average A/F reading and a single cylinder EGT.
I always thought it was supposed to go into the farthest cylinder(exhaust port) from the throttle body...Which would be the leanest cylinder as well because of the difference in distance that the air has to travel.That cylinde would assure that the rest were running at that temp or lower.
The cylinder farthest from the throttle body is not necessarily the leanest since we don't have throttle body injection. Roughly the same amount of fuel goes into each cylinder. A lot of work is done by the manufacturer to make sure that airflow stays consistant to all the cylinders too. So you just have to assume that the amount of air and fuel in each cylinder is the same. The two middle cylinders should run hotter since they are surrounded by other cylinders. (They get less convection from the block and they absorb heat from the neighboring cylinders.) Your best bet is doing it how I posted above.ForceFed said:
mallard, do you have a picture of exactly where you are reffereing to? im not exactly sure where that is and im gonna have to point it out to a person who has the education of a duck.
I don't have any pics of my personal car since my manifold is out right now to have a bung welded on (MAM) but I googled and found some pics.
http://www.205turbo.nl/Images/spruitstuk%20nw%208.JPG
http://hhscott.com/93tmv/images/egt_probe.jpg (read his page too http://hhscott.com/93tmv/instruments.htm)
Read this page too - http://www.thermoguard.com.au/instal.html
While the last one disagrees with my point that it should be in a single runner, and not the collector, it does agree that it should be upstream of the turbo. I have always been told (and I agree) that I would rather tune and monitor my engine by looking at the hottest cylinder, not an average of all 4. You'd want to tune by looking at a single cylinder EGT (the hotter cyl) and an average A/F.
Put the thermocouple about 2" from the head in the exhaust runner for one of the middle two cylinders on an outer diameter. (The outer diameter will have the hotter, faster moving gasses)
I'm slightly past the education of a duck. I have my engineering degree...so just barely past a duck...maybe a goose...
http://www.205turbo.nl/Images/spruitstuk%20nw%208.JPG
http://hhscott.com/93tmv/images/egt_probe.jpg (read his page too http://hhscott.com/93tmv/instruments.htm)
Read this page too - http://www.thermoguard.com.au/instal.html
While the last one disagrees with my point that it should be in a single runner, and not the collector, it does agree that it should be upstream of the turbo. I have always been told (and I agree) that I would rather tune and monitor my engine by looking at the hottest cylinder, not an average of all 4. You'd want to tune by looking at a single cylinder EGT (the hotter cyl) and an average A/F.
Put the thermocouple about 2" from the head in the exhaust runner for one of the middle two cylinders on an outer diameter. (The outer diameter will have the hotter, faster moving gasses)
I'm slightly past the education of a duck. I have my engineering degree...so just barely past a duck...maybe a goose...
It should definetely be before the turbo, and as I have seen plenty of times in Proteges, the #1 cylinder is the one that always throws a rod...so it would be my opinion that the number 1 cyliner is the one that should be monitored....the farthest away from the fuel supply line. The same was true with the WRXs, the number 3 cyliner was the farthest away from the fuel supply and generally the hottest.(yes)
The point of an EGT gauge is to save your valves from melting, not monitoring your a/f. Saying that the #1 cylinder is hotter when it has more convection/radiation heat loss then cylinders 2 and 3, as well as having only one bordering cylinder to get additional heat transfer, is a brave statement without any data. Saying, "the rod blew so it must have been the hottest," would be an incorrect statement without some sort of temperature data.
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- MP5T / 944
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I wanted to know how hot it was before the turbo... Not how well the Turbo could cool the Combustion.
The point is to see how much heat your pistons and valves are getting.
I wanted to know how hot it was before the turbo... Not how well the Turbo could cool the Combustion.
The point is to see how much heat your pistons and valves are getting.
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- MP5T / 944
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- MP5T / 944
It's rather far but sits around 1200 F with the DEI Wrap at 120 Km/h constant...
