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Yes Matt has posted up some good reading and is very interesting.
Temperature drop across the turbine is part of its operation though and the cooling and expansion of the gases is what drives it.
There are many varying opions as to what the temperature drop should be.
The information Matt posted in my view just tells us not to rely on post turbo EGT's for a indication of what is really happening.
As I said earlier I have no prefference either way for which turbo to use, but just don't waste your money modifing the HT18.
I only run the Garrett because at the time there wasn't much else around, and it was cheap.
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