Nervous about pyro install
Senior User
Joined: Jan 2006
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Originally Posted by 99bajakid
what is a safe range for a post turbo pyro? there's no way im willing to risk my 10k engine with metal shavings and the possibility of my the probe breaking off due to the heat.
Senior User
Joined: Jan 2006
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Here's more info for your decision making.... This helps explain the "temperature cushion" that I posted earlier. This is straight from Banks
Today, the thermocouple probes that are used are commonly sheathed in a stainless steel shell that is impervious to the type of failure that an exposed junction thermocouple might experience. This makes it safe to install upstream of the turbocharger. At Banks, we typically prefer to mount the thermocouple upstream of the turbo, but this is not always convenient. In the case of the Ford Power Stroke, we opted to provide a bung in the turbine outlet pipe rather than having the customer go through the difficulty of drilling and installing a probe in a location that is hard to access. Our testing shows that the maximum allowable turbine inlet temperature of 1350 degrees is equivalent to 1050 degrees on the turbine outlet side, so that is our recommended maximum temperature when measuring in that location. The temperature differential may be broader at lower temperature ranges, but the temp that we are most concerned about is at full power.
From Banks web-site:
Today, the thermocouple probes that are used are commonly sheathed in a stainless steel shell that is impervious to the type of failure that an exposed junction thermocouple might experience. This makes it safe to install upstream of the turbocharger. At Banks, we typically prefer to mount the thermocouple upstream of the turbo, but this is not always convenient. In the case of the Ford Power Stroke, we opted to provide a bung in the turbine outlet pipe rather than having the customer go through the difficulty of drilling and installing a probe in a location that is hard to access. Our testing shows that the maximum allowable turbine inlet temperature of 1350 degrees is equivalent to 1050 degrees on the turbine outlet side, so that is our recommended maximum temperature when measuring in that location. The temperature differential may be broader at lower temperature ranges, but the temp that we are most concerned about is at full power.
From Banks web-site:
Junior User
Joined: Jun 2002
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Things that make you go hmmmmmm.....
From a rookies perspective, it seems to me that post turbo is the safest way to go when egt's are factored at 300 degrees less. Both ways, pre - post, should give accurate readings, both beneficial information, but different (+- 300#).
So....when asking the gurus here on the board an egt temp ?, one should elaborate pre or post temp readings and all is good?? hmmmm......
From a rookies perspective, it seems to me that post turbo is the safest way to go when egt's are factored at 300 degrees less. Both ways, pre - post, should give accurate readings, both beneficial information, but different (+- 300#).
So....when asking the gurus here on the board an egt temp ?, one should elaborate pre or post temp readings and all is good?? hmmmm......
Lead Driver
Joined: Oct 2004
Posts: 7,413
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From: Columbia, MO
Post turbo, keep it under 900-950* and you'll be safe. As far as a probe breaking off and ruining your engine -- doubtful. If the probe does break off, it's going to go through your turbo, not your engine. Remember the probe is in the exhaust stream, not the intake. Granted, a turbo replacement isn't cheap either, but it's no where near 10K.
Lead Driver
Joined: Jan 2006
Posts: 7,308
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From: Hartford, WI
With all this talk of it breaking off and screwing your turbo, engine, etc, etc, how many cases has anyone really noted? Not saying it is a not a possibility but how many pre-turbo gauges have been installed and how many failed? It is like boob enhancement surgery. Millions have been done and maybe a few thousand failed, am I going to rip out mine just cause?
Junior User
Joined: Jun 2002
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Point well taken, aklim...If I had mine installed pre turbo, I would leave it as well. I'm installing a new down-pipe as well as gages, I think I'm gonna go post turbo as it will be an easier install and, as long as I understand the readings are post turbo (i.e. 300# less) as Mr. Harvey stated above, I'll be able to monitor egts effectively.
Great thread, BTW!!
Great thread, BTW!!
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Joined: Nov 2004
Posts: 233
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Originally Posted by turbostroke
If the probe does break or melt there is no harm in a post turbo probe application as it will just fall into the downpipe and get sent out the exhaust to your catalytic converter or muffler (if you have either of these). The pre-turbo scenario with the glow plug comparison was brought up to show that both of these probes operate in the same "temperature environment" in the neighborhoods of 600-1300 degrees. As a glow plug needs around 800 degree to ignite the fuel but reaches 1200 in a only few seconds. The pre-turbo application is in this type of heat the whole time your truck is running. It your truck, its your choice... but the instructions say post turbo for a reason with one of them being that if there is a probe failure in the exhaust manifold the probe manufacturer isn't going to pay for your damages along with the fact that Ford and its dealers aren't going to pay for your damages and probably the members on FTE that say to place it in the exhaust manifold are not going to start a collection fund to pay for your damages.
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Lead Driver
Joined: Oct 2004
Posts: 7,413
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From: Columbia, MO
Originally Posted by aklim
With all this talk of it breaking off and screwing your turbo, engine, etc, etc, how many cases has anyone really noted? Not saying it is a not a possibility but how many pre-turbo gauges have been installed and how many failed? It is like boob enhancement surgery. Millions have been done and maybe a few thousand failed, am I going to rip out mine just cause?
In any case, I will be installing a pre-turbo probe very soon. The parts are in, I just need to get over being sick so I can have the energy to do anything but lay on the couch.
I do have one post-turbo, and it will stay. I'm adding the pre-turbo for more accurate readings. If the probe breaks and my turbo eats it, causing a turbo replacement, this board will be the first to know.
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Originally Posted by jtharvey
Post turbo, keep it under 900-950* and you'll be safe. As far as a probe breaking off and ruining your engine -- doubtful. If the probe does break off, it's going to go through your turbo, not your engine. Remember the probe is in the exhaust stream, not the intake. Granted, a turbo replacement isn't cheap either, but it's no where near 10K.
QUOTE {We might mention that some mechanics fear installing the pyrometer thermocouple in the exhaust manifold for fear the probe will break or burn off and blow into the turbocharger. Such a piece of foreign material entering the turbine would cause serious damage that could in turn break the compressor wheel of the turbo, sending broken pieces into the intake system of the engine where even more damage could occur. While the above scenario is scary, it is also unlikely.} UNQUOTE
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