These are my humble tips about my 147, so far...
The standard 147 suspension is a bit wobbly, a bit too soft for my taste. The car dives in hard breaking, and, as I found out, it isn't very difficult to break the sump if you fall in a big hole.
I changed the springs to ones from H&R (for about 200 euros + fitting) and it feels much steadier, and the car feels more comfortable than with other (harder) springs that I've tested. In corners and on even roads the car will roll much less, but at fast speeds (>160Km/h) on uneven roads the standard shocks(dampers) don't react fast enough to the springs, and you'll feel impulses (down->up) that will tend to make you lift your foot from the throttle.
So I think that if you change your springs you'll definitely need to change the shocks too.
I still haven't bought a new set of shocks mainly because of the price (Bilstein B8 650 euros, Kony Sport 500 euros). I'm still trying to check prices for other alternatives (like Sachs).
If you get 50 thousand warnings when you're going to start the car and it doesn't make any kind of engine noise when you turn the key on, your battery just ran out!
I was used to some kind of warning when the battery is low (like your car taking a minute to start), but mine didn't warn me at all. Instead you get all kinds of warnings from your OBC like ABS Failure, Airbag Failure, ASR Failure, EBD Failure and so on (I thought my ECU went mad!!).
A bigger battery is also a good thing, as I think that a 50mA is a bit scarce for a 1.6 so heavily loaded of electric gadgets. 55 or even 63 is a good bet! A better grounding system is also on my mods list.
2nd hand buyers:
Especially those who bought the car from an old man or a lady, should definetely reset their ECU. I did it (when my battery ran out) and I can guarantee you that you'll find a completely new car - much better acceleration on all ranges (and worse fuel comsumption too).
This car eats a bit of oil. I've found that the problem I had with mine (1 litre per 6000 km) was solved when I replaced the variator. (The previous owner replaced the cambelt after 4 years - 30K Km, but he didn't replace the variator too).
Just check the oil every couple of weeks and keep it mid to top. TS engines don't like running with low oil!!!
My wish list:
- New dampers
- New exhaust
- Autodelta remap
- New airfilter
- win the lottery to pay for the wishes above, and then buy a GTA