Having upgraded engine, ie Kent Cam, Gas Flowed/Ported Head, Janspeed etc. car was too fast, quicker than RS Turbo's. Lowered suspension but car too flimsy. Something always goes wrong: Warped head, suspension mounts, clutch, radiator, fan.. the list is endless.
Never tune a car - especially an AX.
Tuning a car is not the problem. I drive an Uno Turbo running at 170bhp, and it goes fine.
Unfortunately AX's, being the flimsy things they are, simply cannot handle big power increases, as my mate found out when he lost it and ploughed straight into a tree (doh!).