Yeah, thats my polo...
in all honesty i must say i do believe my mate with the supercharged ST does not has his 295Whp..
it was tuned and dyno'd at JAM-sport, 295on the wheels and 320Hp on the engine, but i believe it's more like 200Whp and about 230Hp on the engine.
apart from that i would have no problem with an astra with 190Hp...
the day before yasterday i raced a Renault Megane RS Trophy (new model)
he had intercooler and was remapped, made 297Hp and 443Nm.
on torque i could pull away 1 carlength and stay in front of him all the way up to 235km/u,
i also tested against a Leon Cupra R wich was remapped, made 302Hp and also around 450nM.
he is exacly as fast as my polo, we go head to head all the way, only from a standstill start i am quicker, i get my power dozn better as the 6-speed shorter gearbox of the leon.
to give you a benchmark time about how fast a stage II GTI should be... BMW E46 M3
rolling start 2nd gear i can pull half a car on him up to 180km/u, after that its equal to 200km/u, after 200 the M pulls my ass slightly.
at around 250km/u he has 1 carlength on me.
i can give you hundred of examples but it would not help you... an intercooler does
there is 1 big problem on a polo GTI, the stock intercooler is TO small and it's hidden away at the side were hardly could air can reach it.
i have a Seat sport intercooler from the Ibiza Cupra D 1.9pd 160Hp.
does the trick pretty good and it can flow 350Hp without problems.
this is what you need, trust me.
if you pull 3 times with a full stock polo, you will run slower times from the second time allready, specially on a hot day.
let alone stand if you have it remapped, more pressure = more heat, and it cant work well with hot air getting into the engine.
you can put a could air feed on it for youre airfilter etc, but it won't matter.
if you have a turbo you must make sure youre intercooler is good, that is the main key!
and you will notice you will have more HP with youre remap (on a stock car it makes nearly no diffrence, i had 7Hp with milltek and intercooler)
but with remap it will makes all the diffrence, more power and it wild hold it's power run after run (if you have a good IC system)
i can show you a video of me racing my polo with Milltek and IC against a polo with only remap, and i pull 2 cars on him in a 200m dragrace.
and my launch was worse than his so that was not my opportunity.
problem was that he had heatsoak, wich rsults in powerloss, i had 170Hp back than, he made 195Hp on dyno.
but it was a hot day, so with heatsoak he would probably have 170Hp also or even less maybe...
anyway, i wish you luck, if you need to know anyting i can help with, let me know...
good luck!