I was curious as to where the proper location to install an Exhaust Gas Temperature (EGT) probe would be. The Juice/Attitude, pictures a probe at the #8 exaust port, but still in the main stream of the exhaust. Problem is, it would seem to me that #8 cylinder would influence the reading if something were amiss. Is there a recognized way GM measures the exhaust gas temperature? I have a gauge I wish to install, but no references as to where to put it's probe. Thanks.

The real trick would be to find what cylinder runs the hotest and place it there, but I dont think anyone has ever messed with one enough to find out. So, everyone seems to go for the right manifold as its the easiest to get to.

A few things to think about. If #8 cylinder produces an large influence on the EGT, then you might have a bit of a problem. For example, an injector could have a problem, or a bad valve.
If you place the probe just before the turbo, you would get an average temp for all cylinders. Some have said that is a bad place because if the probe fails, and a fragment falls into the trubo, you have a problem. If you place it after the turbo, you will get a slightly lower reading because the turbo will absorb some of the heat energy doing its job.
Regardless of where you place the probe, be real careful when drilling the hole. You want to keep the metal chips from falling inside as some of them might get into the turbo wheel.

[QUOTE=hannaco]A few things to think about. If #8 cylinder produces an large influence on the EGT, then you might have a bit of a problem. For example, an injector could have a problem, or a bad valve.
If you place the probe just before the turbo, you would get an average temp for all cylinders.

My point exactly... I just wanted some input. As far as probe failure, I think it would be more inclined to fail at the extreme heat immediately outside any particular exhaust port. As far as keeping the metal shavings out of the exhaust and turbo, I was going to put my shop vac to the tail pipe (blowing not sucking) and have it blow (pressurize) the exhaust system while drilling the hole. I think that would be much easier than removing an exhaust manifold.

Here is a great step by step install. It is towards the end.

http://www.bmdmax.com/Gauges.html.0.html

Ben

On the 2 Turbo mustangs I help build/pitted for, We ran the probe right at the cylinder, 1750-1850* was the peak temp at the end of every run, never had a probe problem. However, that was usually running multiple probes on each bank, in the even we only ran 1, it was always as close to the point all the exhaust came together before entering the turbo. Installing after the turbo is not a good place to get a good reading, the reading is slowed down, becuase of temp equalization from the turbo housing and the absorbtion of the housing/impeller.

But we arent talking about 1500-2000 hp race cars, I would just put it towards the back of the right manifold and call it a day.

Hey blnagel - Ben:

That was a great site that you recommended. :cool2: A definite must see for all you that are installing gauges.

Frank.

You can also check this thread out.

http://www.dieselplace.com/forum/showthread.php?t=892

Thanks to all who replied! It will be done. I never thought of running the engine during drilling and tapping of the manifold... (better than my idea).. I was slightly concerned with my plan of blowing air with my shop vac into the tailpipe. No matter where the engine stops in its rotation, a set of exhaust valves are open. My concern was possibly blowing dirt or carbon into any cylinder where the exhaust valves where open.

Now I can.....http://www.dieselplace.com/forum/images/smilies/grd.gif