Remember guys... "good will to all men" I don't mind the banter
I've been thinking ( which is usually dangerous and nearly always expensive!
). Without the upgrade turbo and with the uprated intercooler and radiator, plus water/meth I still reckon the Polo GTI will get between 250-260bhp. With some more weight reduction I reckon the car can easily get under 1,100kg, so we are still looking at a car with around 230bhp/ton and a lighter weight to tow around bends and out the other side.
A GTI MKV would need to have over 320 bhp to have the same power to weight ratio, but would still be slower around corners and out the other side.
Taking this into consideration, my revised plans are to reduce the weight further with bucket seats, lightweight bonnet, wing mirrors, removal of the supercharger soundproofing, LSD, even lighter alloys and some other tweaks like a front extended diffuser to help even more with cornering. In the meantime I will look at revised internal costs for pistons and rods and then go back to the uprated turbo and map at a later date and 300bhp+. the funds are there to do it all and more and I don't want to change cars as I love the car as it is already and any enhancements will just make it even better.
I could have had my choice of a lot of cars, but this has to have my widest in mind too, so on road usability is also important.
Merry Christmas guys
