The power bands goes from 3500 right through to 6500 on the 1.6 TS.
Not on mine it doesn't, it feels like I have a surge in power around 3 and a bit K when it comes on cam then I get another surge at around 5K when it's not so much torquey as a surge in revs through to about 6.5 > where I normally change up so i'm slap bang in the middle of the power band on cam in the next gear, only really works in 2nd to 3rd on mine though, I've had the asr on before now when planting it after the slip into 3rd but that was with the straight through pipe on the back.
Having driven a few different cars lately I have to say that the 1.6 TS is a brilliant engine, it's smooth, sounds great and once on cams pulls cleanly all the way to the redline and I keep thinking what would a little tubular steel spaceframed trackday toy be like with one sat just behind me powering the back wheels?
Nero Fuoco 147 Lusso - Bianco Nuvola 147 GTA - Carbonio Brera SV - Azzurro Le Mans GT 1600 Junior
the answer to the powerband question depends on how you define a powerband. its an age old argument, but the generally accepted method is the rpm range from max torque to max power.
in the example above, that would mean the powerband is approx 4750rpm-6250rpm
assuming those curves are accurate, it shows that the best way to improve the power band is to widen the torque curve so peak torque occurs earlier. thats pretty much a golden rule with a petrol N/A but its nice when commonly accepted theory is backed up by a real world example.
Quite lucky with mine, sails through all the rev range in all gears, hasn't even been mapped. From a standing start, where its legal of course, by the time I hit 3rd gear I'm already at the 3500 rev mark so acceleration is fantastic, even for a 1.6 it still manages to out shine most.