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Originally Posted by sixto
The general trick to tapping the exhaust manifold for an EGT sensor is to drill with the engine running. Exhaust pressure should blow the drilled material out rather than to the turbo. Also the turbo isn't spinning at idle so the material will go right through. I've seen it done successfully on a few turbo cars.
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There is very little exhaust pressure at idle. I'd be surprised if chips that fall off the end of the bit would blow back up through a 3/8" (approx.) hole.
AFAIK the turbo is spinning at idle. The exhaust has to go somewhere and it must pass the turbine wheel so the turbo will spin slowly. The chips may very well pass through the turbine wheel, however, if one of them gets caught between the turbine wheel and the housing..............
If it was done successfully, I would say that there is a bit of luck involved with the presence of small chips that pass the turbine without problems.