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  #1  
Old February 12th, 2014, 02:54 AM
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EGT pyrometer questions

I'm finding conflicting advice on the installation location for an EGT probe on the 300Tdi.

JSQ, John B., and Carl have all installed their probes on the exhaust manifold, pre-turbo.

Michele has installed his on the exhaust downpipe, post-turbo. Brian Hall prefers a post-turbo installation and says that post-turbo readings are useful in detecting imminent turbo failure.

I'm interested in hearing others' experiences with EGT placement.

I'm leaning towards post-turbo, one reason being that I don't want to have to tap a bung into my sexy new ceramic coated manifold. I should have plumbed for EGT before getting the exhaust coated but I forgot so if I have to mar the finish, I'd rather it be on the downpipe.


I'm also trying to find out if the skinny Auber Instruments EGT probe is compatible with the VDO EGT gauge. I just can't bring myself to cut my clean dash for one of the Auber digital gauges so I have to go VDO and I'd rather avoid the fatty VDO probe.
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  #2  
Old February 12th, 2014, 05:12 AM
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If before turbo you'll have a better idea of the temps your engine is experiencing. And risk of damage
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  #3  
Old February 12th, 2014, 06:11 AM
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Probe goes on the flat boss on the front of the mani. Drill tap install.
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  #4  
Old February 12th, 2014, 08:16 AM
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Yes, closer to the cylinder head will yield more accurate your readings. Post turbo can vary up to 300 degrees from pre-turbo, which leaves an awfully large margin for error when you're trying to tune the engine.
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  #5  
Old February 12th, 2014, 08:23 AM
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The turbo actually eats/drops a fair amount of the heat given that one side is pumping cold air. Ie the thermal energy that hits the turbo is designed to be significantly dissipated by the turbo. The entire point of an egt is to keep close tabs on the heat you are creating. Putting the probe post turbo is muting/dulling the reading and much lower readings should be considered alarming from post turbo, ie the pyrometer won't swing back and forth as quickly. The egr block off plate is the ideal location for the probe on a 300 manifold,if you are running that manifold. If you are running a modified tdi setup I would consider your EGT gauge the most important one inside the truck. Don't put the probe post turbo just because you don't want to mess up a "sexy ceramic coating". Having the little EGR block off plate re-coated can't cost much.
Knowing the accurate temp hitting your turbo seemingly is better information, rather than what temps are after the turbo has done its thing. Egt's don't just effect the turbo. You can burn a hole in a piston or even erode the exhaust valve seats in the aluminum cyl head if you aren't careful.

Put it this way, post turbo egt's would be like moving your coolant temp gauge sensor from the cyl head outlet down to the radiator return hose after the radiator has cooled the coolant as much as possible. You are no longer measuring engine temp but rather the radiators ability to cool it.
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  #6  
Old February 12th, 2014, 10:47 AM
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Ask yourself why you are installing the EGT in the first place. That should determine the location

There's nothing to suggest you'll have to re-coat the manifold if you tap it now. A good machine shop should be able to gently drill a flat area to tap without flaking the coating.

Personally I am very happy I got the digital gauge even though I had a VDO ready to install. I like being able to see that red warning light out of the corner of my eye occasionally to let me know. You can fabricate and powder coat a nice bracket for it to make it fit in with the layout of your dash. Get an Auber Boost gauge too so it doesn't look so lonely
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  #7  
Old February 12th, 2014, 11:07 AM
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I have mine mounted in the EGT cover plate. Another thing not mentioned so far is to buy a probe long enough to get the tip to be positioned mid way in the flow of the exhaust stream. Careful how you weld the EGT mounting bung on the plate to have tip end up in the correct place.
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  #8  
Old February 12th, 2014, 11:16 AM
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Probably good to point out that Chris is installing a VNT so in all likely hood it is not the stock manifold with a plate.
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  #9  
Old February 12th, 2014, 12:09 PM
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Quote:
Originally Posted by Manimal View Post
Probably good to point out that Chris is installing a VNT so in all likely hood it is not the stock manifold with a plate.
This ^^^


No EGT plate. I had to do the same thing when I installed my VNT
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  #10  
Old February 12th, 2014, 01:19 PM
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Quote:
Originally Posted by Dennis View Post
I have mine mounted in the EGT cover plate. Another thing not mentioned so far is to buy a probe long enough to get the tip to be positioned mid way in the flow of the exhaust stream. Careful how you weld the EGT mounting bung on the plate to have tip end up in the correct place.
Dennis,
Was your bung welded on simply centered?
Thanks,
Pete
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  #11  
Old February 12th, 2014, 01:34 PM
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Thanks, guys. Yep, I have the VNT and there's no plate. So, Jason and Carl, you guys just had a machine shop drill your manifold? Did you have a bung welded in to hold the gauge?
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  #12  
Old February 12th, 2014, 01:37 PM
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No idea how thick your manifold is, but I drilled and tapped my 200TDI manifold directly (for 1/8" NPT). There is more than enough thickness. No machine shop needed. If you plan on welding, make sure it is steel and not cast iron...
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  #13  
Old February 12th, 2014, 01:48 PM
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I dropped it off at a machine shop as I wasn't able to do it myself. The Auber doesn't have a bung. It think it's optional. The shop guys advised against welding and suggested a direct tap. We picked the thickest part of the manifold which I believe was about 10MM. They drilled a flat area then tapped that location. Detailed images here. Note, as Dennis mentioned that the probe is centered in the tube.
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Old February 12th, 2014, 02:24 PM
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Quote:
Originally Posted by Broncoduecer View Post
Dennis,
Was your bung welded on simply centered?
Thanks,
Pete
I got my bung from Westach along with my gauges & probe. http://www.westach.com/

I welded the bung at an angle as to get the 2-1/2" probe into mid stream on my 300Tdi, EGT blanking plate.
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  #15  
Old February 12th, 2014, 03:39 PM
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Quote:
Originally Posted by Manimal View Post
I dropped it off at a machine shop as I wasn't able to do it myself. The Auber doesn't have a bung. It think it's optional.
For the records, it does, or at least I got one with mine...
Glad to hear you're getting close to finish the installation.
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  #16  
Old February 12th, 2014, 03:44 PM
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Quote:
Originally Posted by Cube II View Post
For the records, it does, or at least I got one with mine...
Glad to hear you're getting close to finish the installation.
Correct. The auber is available in a number of different options. I considered using the bung but the threaded 1/8npt was easier on my cast 200tdi exhaust manifolds.
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  #17  
Old February 12th, 2014, 03:47 PM
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The kit does not come with a weld in bung unless you order it specifically. The TC-KEGTS lkit comes with this probe. Options for it (including weld on bung) are listed below it.

Quote:
Originally Posted by Cube II View Post
For the records, it does, or at least I got one with mine...
Glad to hear you're getting close to finish the installation.
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  #18  
Old February 12th, 2014, 06:06 PM
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It's probably not the wisest to weld a bung onto the cast manifold for the VNT anyways. Cast is inherently difficult to weld, and with the extreme heat fluctuation the manifold will see I would be concerned with the weld failing. The wall thickness seems to be enough to drill and tap safely. I have a 2.8 swap in the shop currently that will be receiving the same treatment.
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Old February 12th, 2014, 06:08 PM
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^^^^^
That's exactly what the machine shop guys told me.
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Old February 12th, 2014, 06:16 PM
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I just picked up the VDO EGT, and the Auber Instruments probe and threaded adapter. I actually picked up both the 1/8" NPT and the M8x1 adapters. I will use the M8 unless it's significantly larger and/or the machine shop can't deal with metric properly.

I'm going to go with the pre-turbo location.

I'm not certain that the Auber probe will work with the VDO but I think it will because they're both Type K thermocouples and as such, should have the same characteristic function for E(T) over temperature.

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