Jimmy: R will be slower than a gti with R turbo, maybe not 0-60 but look how the cupra compares to the R's laptimes round Ze ring.
Kreator: wouldn't like to find out, ecu would probably request the wrong fuel and air mixes and it wouldn't be pretty lol
Apparently the Cupra taken round the track wasn't the same as the one on sale, had different tyres and I think I read brakes and a few other bits to boost it round the track. Can't remember the details, but it was done because the target audience are the type of people that quite lap times.
Don't the R and GTi share the EA888, but the R is modified? different pistons, cylinder head, injectors and the turbo? If that is the case why would a GTI with the R turbo be faster? I appreciate the AWD system affects it, but the traction benefits are a bonus.
Genuine question, I know a bit about tuning, but not enough!