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With the TwinAir does SS kick in instantly like on the 1.2 when you've reached the end of an off ramp after having just been sat at 70mph? If so those turbos must be taking an absolute hammering?
The S/S doesn't take into account turbo, exhaust or intake temps. It will shut down a hot engine if it wants to. I switch mine off if I'm having a 'go'. Having said that though, I think as long as you coast to a stop the turbo will have already cooled. Intercooled engines don't need to be idled for long before shut down. Could certainly get expensive for those only getting 30MPG though.