[sambeeb]

thanks for that. That is an awesome post with a tonne of detail to pour over. I've since corresponded with some tuners who are familiar with my motor. They say that 4.5 degrees pull as seen in ross-tech VCDS is not necessarily 4.5 degrees pull due to solid knock - the knock sensors can apparently decipher imminent knock and pre-emptively pull timing. This means (if true) that I can run much more timing than I had previously thought safe and so there might be potential yet for water injection on this tune. Thanks for the advice so far and i'll let you know how I get on.

thanks
sam