EGT Probe
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Postmaster
Joined: Mar 2008
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From: Sweet Home, OR
EGT Probe
I stole the a-pillar gauges out of my '97 PS to use in my '94 IDI turbo.
I haven't started to put them in yet but the pyrometer is an Issopro and the probe was in the cross-over pipe.
I would like to put the probe in the exhaust manifold but the problem is that it installs by drilling a hole for the probe and then using a built-in hose clamp around the pipe to hold it in/on the pipe.
What are the cons of having it in the cross-over pipe? Basically how much temp. indication difference would there be?
It sure would be easy to mount it there.
Also as far as installing it: if I mount it there wouldn't removing the cross-over pipe to drill the hole be smart?
I have a (maybe irrational) fear of sending ANY metal chips through my turbo.
I haven't started to put them in yet but the pyrometer is an Issopro and the probe was in the cross-over pipe.
I would like to put the probe in the exhaust manifold but the problem is that it installs by drilling a hole for the probe and then using a built-in hose clamp around the pipe to hold it in/on the pipe.
What are the cons of having it in the cross-over pipe? Basically how much temp. indication difference would there be?
It sure would be easy to mount it there.
Also as far as installing it: if I mount it there wouldn't removing the cross-over pipe to drill the hole be smart?
I have a (maybe irrational) fear of sending ANY metal chips through my turbo.
Elder User
Joined: Dec 2008
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From: Page Az.
You can get a replacement probe that screws in for about $45 at napa, but what you have should work fine. I would install it about 2" below the drivers side exhaust manifold if you go that route. Yes I would remove the crossover to drill it, some will use grease on the drill bit to catch metal pieces and drill it in place but better safe than sorry as easy as it is to remove. Besides while you have it off wrap it with exhaust wrap and that will help build boost. The only con that comes to mind is anytime you put a probe before the turbo there's a chance of it breaking and going through the turbo even though the odds of that happening are probably 1 in 1000
Elder User
Joined: Dec 2008
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From: Page Az.
It does a little. On my engine I'm lucky that all the factory exhaust and turbo heat shielding is still there and in good condition plus I wrapped the crossover pipe. I did a little experiment a couple of years ago , using a dual pyrometer I put a probe in a manifold and a probe within 1" of the turbo outlet and ran the hell out of it. On mine I found that the difference was less that 50* between them so having seen a couple of times what a broken probe can do to a turbo I decided to remove the one out of the manifold. I'm sure the difference on a system with no heat shielding or exhaust wrap will be a little more.
Post Fiend
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From: concord ca
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Post Fiend
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From: Nutter Fort, WV
The bad thing about mounting the probe after the turbo is the heat loss value is not constant.
Waste gate opens, the exhaust is bypassing the tubo and making the heat difference less between the pre turbo and the after turbo reading.
Why figure with about numbers when you can get the actual reading.
Waste gate opens, the exhaust is bypassing the tubo and making the heat difference less between the pre turbo and the after turbo reading.
Why figure with about numbers when you can get the actual reading.
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Postmaster
Joined: Mar 2008
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From: Sweet Home, OR
You can get a replacement probe that screws in for about $45 at napa, but what you have should work fine. I would install it about 2" below the drivers side exhaust manifold if you go that route. Yes I would remove the crossover to drill it, some will use grease on the drill bit to catch metal pieces and drill it in place but better safe than sorry as easy as it is to remove. Besides while you have it off wrap it with exhaust wrap and that will help build boost. The only con that comes to mind is anytime you put a probe before the turbo there's a chance of it breaking and going through the turbo even though the odds of that happening are probably 1 in 1000
I'm not too worried about the probe going through the turbo, I'm sure it's occured but I don't know of a real case myself.
It's worth the slight risk to me as I've seen Cummins have an almost 200* heat differential between pre and post turbo.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
I have seen many more engines damaged from no or inaccurate pyrometers than I have seen turbo's damaged by thermocouple tips.
The one turbo I did see that was suposed to have been damaged by the thermocouple tip, I think may have had a few more parts than just the thermocouple go through it.
The one turbo I did see that was suposed to have been damaged by the thermocouple tip, I think may have had a few more parts than just the thermocouple go through it.
Elder User
Joined: Dec 2008
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From: Page Az.
I seen the results of probes going through one 6.9, one powerstroke and a couple of 8v-71 detroits. Detroit used to put them in the turbo up pipe years ago until a few of the probes broke. After that they installed them after the turbo. Tears up turbines and housings pretty good but so do broken valves or pieces of piston crown. Its really interesting on the Detroit high horsepower marine engines with water cooled turbos. When a valve breaks and gets sucked up into turbo at 2300 rpms it has such force when it hits the turbine wheel that it will puncture the turbine housing and allow all the engine coolant to blow out the exhaust which usually means a severely overheated and trashed engine if the boat pilot isn't paying attention.
