Quote:
Originally Posted by valdezhilander
What do you base that on? There are plenty of folks on this site that have the probe after the turbo and I am not aware of there being a trend for burn downs? I base what I say off of my personal experience as a diesel mechanic, and I tend to trust the people that design engines that put down 600+ hp and charge upwards of $40,000 for an engine. Here is one more reason, your cast iron mainfold was designed to have certain holes in certain places and expand a certain way, when you start drilling holes in any cast material in a spot not intended to have a hole you weaking that casting and creat a perfect spot for a crack to start. Here's my final comment, you can put that probe where ever you want, but I am going go with where the engineers that actually know what their talking about put it.
There it is...
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Here is a link to the quote "experts who design the 600+hp"
as far as cracking the exhaust manifold I would like to see a post with pics of someone who has cracked a exhaust manifold thru a hole drilled and tapped for an EGT. If Banks is not big enough of a designer than who would you believe?
Banks Power | Why EGT is Important
Whether the pyrometer thermocouple is mounted before or after the turbine is usually a matter of finding a suitable mounting location, or of convenience. It should be noted that when the EGT is measured after the turbine, the turbine outlet temperature at full throttle or under a heavy load typically would be 200º to 300º F. lower than the EGT measured in the exhaust manifold. The temperature drop after the turbo indicates the amount of heat energy in the total exhaust gas flow that was used to drive the turbocharger. The temperature drop through the turbine is also related to the total flow and speed of the flow through the turbo. At part throttle, under light load, such as cruise conditions, the turbine outlet EGT may be as much as 500º F. lower than the turbine inlet temperature, but the total exhaust flow is much less than at full throttle. At high turbine speeds (under heavy load) the exhaust gases simply don't have time to give up as much heat energy as they speed through the turbine. This variance is why installation of the thermocouple in the exhaust manifold is considered more accurate. The EGTs discussed in the remainder of this article will all be turbine inlet temperatures.
Not my words but I installed my EGT preturbo by drilling a hole and tapping it, knowing what the temp after turbo is a guessing game in my opinon.
BJ70, new frame galvanized, 13BT, warn birfield replacement kit, rear disc conversion, AC installed, Old Man Emu lift kit, anti reverse shackles,
Jim