the 1.6 corsa is well over a second slower 0-60 on paper and has 106bhp new compared to the rs1800 with 130bhp new. the corsa is about 60kg heavier and doesnt have half the mods the rs1800 does. im fully aware that an rs1800 isnt a quick car in todays standards but it should beat a 1.6 corsa hands down. i know for a fact that my car isnt performing like it should do hence why im asking for help. and yes i could go out and buy a saxo vts or an ibiza cupra quite easily but every other halfords carpark cock has got one of those. i'd rather spend the money on a ford rs of any sort.
Anyway, the idle speed control valve is the first thing i changed its brand new so highly doubt its that, thanks for the pointer!