@ Oldschool -
Not a dig mate, but didn't Tym's turbo go bang only a week or two after his remap? If so, the rolling road didn't detect his poorly turbo?
I would have loved to get his turbo for examination, but as it hasn't happened it is difficult to say what caused the turbo failure and what was the actual part failing.
It being some three months difference it could theoretically be the mapping as it has been changed from standard although much higher degrees of mapping with uprated intercooler and other fuels resulting in torque outputs of over 400lb ft and power in excess of 250bhp on at least three cars have not shown any turbo problems till date.
Nobody knows what oil(s) have been used in the engine. Neither do we know in what state the engine was, whether enough oil was in the engine, whether the car was driven in the way it is supposed to, whether oil surge has taken place etc.
What we do know that Garret had a bad batch of turbos and we do also know that all cars prior to the faulty batch didn't suffer any problems. The ones after the batch had no problems so far, but I would not use it as proof yet as the time is too short.
The same batch of Turbos hit VAG, where exactly the same situation occured. The difference was that VAG immediately acted unlike Fiat who tried to hide the problem in public.
At the time being the turbo didn't show any signs of problems as didn't a couple of thousand Garret equipped turbos being mapped by Red Dot, which are still running without problems (most of them are VAG and some Fiat group).