Sorry i meant fuelling, some say F9 is best?
I try to run the fuelling at safe levels that I know look okay from logging with VCDS. Initially I was told that with a HPFP, I'm safe to run F6. Jonny is a big fan of F9 (more air less fuel). I take a more pragmatic view and look at the logs and try to get the AFR between 11:1 and 14:1.
Redline have a great feature on AFR (Air to Fuel Ratio) in this month's magazine