Quote:
Originally Posted by rick_d
as sandcruiser said, unless you are going for performance and believe it is critical to know if you are 1201 F pre turbo either position (pre, or post) does not matter. You should use the EGT as a general guide for operation of the engine and limit stress during the high end and allow sufficient cool down when shutting the engine down.
I see more issues with pre turbo vs a post install as far as failure of the probe and destruction of the $$$ turbo. Do put it close the the hot side outlet to get a solid reading.
I'm post, and avoid sustained 1000F operations (I've touched 1000, but less than 10 seconds) try to keep around 900F or less) and cool down I wait until 400 normally to shut the engine down.
The first 100K before I got the engine the owner never once used an EGT...I want to get another 200K without thinking...
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Have you seen a pre-turbo probe lunch a turbo or is it just the potential that worries you?
The problem with post turbo is the measurements are a guessing game. Sure it'll work as an idiot light (oh look, it jumped 300 degrees, something is wrong), but as a tuning and diagnostic tool it loses all of it's accuracy.
As for a drilled hole starting a crack. Well drilled and tapped holes aren't a good stress riser. Drilled holes are often used to stop cracks growing.