too much power through a tiny block imo
So how do motorbikes manage???
Yes there were a few issues with the 1.0 Ecoboost particularly in the Fiesta (radiator hose was a common one I think), but I doubt there are any many "new" engines that don't have issues initially.
i was thinking that, especially the 140bhp version. it must run quite high boost to get that power.
Not really - given that there is a N/A of the 3 cyclinder engine in both 65 and 80 hp outputs - that means the turbo is good for at most 60hp in the 140bhp version. Look at any turbo vs n/a version of the same car, normally about 50-70hp difference (e.g. VW golf 2.0 - 147hp N/A, 197hp Turbo, Mini 1.6 - 120hp, Cooper S 1.6T - 175hp)
I don't have the Fiesta, but do have the 125bhp 1.0 Ecoboost Focus - it's a slightly heavier car, that I use for fairly short runs, but still manage 45mpg. On paper the Focus has a fairly slow 0-60 time, but in reality has more than adequate performance for day to day (Coming from someone who had a 2.0T A3 and a Cooper S before owning the Focus).