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Mr Ryno is correct. The best place to install the probe would be in the actual manifold runner where the exhaust comes out the head.
But as Ryno said, youwill get shavings inside the manifold and it will damage your turbine.




If you look below, you can see the tube portion that comes down. THis is where I installed mine at. Now this is right after the turbo. This reading is alot more reliable than most other manifolds that are not tapped in the runner. Reason being that the manifold is all part of one cast. WHere I tapped my probe is part of the actual cast and its not like I tapped at the downpipe portion which is alot cooler than the cast iron.

I have my probe as a reference. I take a max reading at WOT. ANd then when i start doing mods later, i know if it affects my A/f by looking at my egt. If the EGT goes alot higher up, i know im running leaner. The best unit is a wide band A/F ratio unit which im working on getting. But they are about $600(well worth it) so the EGT is the second best unit to get.


 

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V8killer,

I was going to attempt to drill as you described, the the place has limited spacing which would cause the manifold to get to hot to quick. I used a step drill and a 1/8NPT tap for my setup.

If any of you guys manage to tap into the runners, tap it on the #4 cyl which is the one on the passanger side(i think thats #4?). Its the leanest running cyl being that the intake manifold section there has the least amount of area.
 

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ravencit said:
Just a thought, but i could be wrong, couldn't you just take the manifold off, and take the turbo off the manifold, or is it impossible, i really havent checked this out.

Another thing is, from my experience, I've seen that an EGT gauge is more of a reliable source of how your engine is being run than an A/F T due to the heat your able to read through the EGT. Im sure you would be able to prevent from killing your motor, but with an A/F gauge (wideband included) you would be just in the ballpark before you knew something is happening.
You are 100% correct. The EGT does not respond as quick as an A/F. Im working on getting my hand on a unit that reads 20 times per second. The EGT gauge has to climb to get to its reading, the A/F displays it pretty quick being that its usually a digital display.

Im yet to see an EGT on a car that responds anywhere close to what is on an aircraft. We use digital EGT gauges on those (turbines engines).
 
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