No I meant the actual wear that has already happened on the engine parts on an old tired engine. The tune wasn't the cause of my problems, ring lands going on stock pistons are becoming more and more common now. Luckily for me that failure caused a strip down of my engine, which then showed that the big end bearings had come to the end of their life anyway, beyond in fact, but caught just in time. We reckon if they had done one more hard run across Europe I could have span a shell! Which would have caused a lot more damaged, so I see it has a good thing my piston went when it did!
A single turbo on a stock UK spec ecu will not kill a stock engine mate, a dyno run showed it would run ok fueling wise etc... Mine had a dyno run on 264 cams, which showed it to just start leaning out, but the cams were only fitted just prior to the trip down to SRD. What is true is that it doesn't drive great on a stock ECU, as in driveability, not the fuelling etc.. But after a proper aftermarket ECU, and a good mapper, the car now drives like a stock car, but on a single turbo. It's drives so smooth and is easy to drive with no lag
It's the extra load of more boost or a single turbo on original parts, that have seen thousands of heat cycles and revolutions over the many years these cars have done now, that will show up the weaknesses and will cause a failure to a stock original unopened engine.