Re: Pre or Post turbo.
We don't need to re-iterate the pros and cons here, they have been beat to death on other threads. But the perhaps the best solution is to mount bungs both pre and post turbo, and do some comparison runs. Run the probe pre-turbo, do some tests, repeat the same tests post-turbo. And block the pre-turbo bung
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Then you will know how much temperature drop you have in your installation.. And you are not guessing by the seat of your pants, based on what others results. Have a look at
Ishobie's dyno run on his HZJ79 The middle gauge is his EGT, and it rises much faster than the boost gauge. The challenge is, the more work your turbo is doing the greater the temperature drop across the turbo. Your temperature drop may only be 100F at 800F, but might be more like 200 or 250 when you are up close to 1200
So the worst case happens right when you need it the most, or when you push it into new territory. Then when you change something like cranking the fuel or adding an inter-cooler, you can re-test yet have the safety of the post turbo install 99% of the time.