for VTXBrit and Johnno FYI.
I find the following site really helpful for tuning queries, so with each of you using a power commander and a tuneboy and vtx's inquiry regarding the tnt and tre using a open loop efi have a look here
www.t595.net/messageboard/thread.asp?thread=35575
I see also the Tuneboy is now making a module, similiar to a pc with additional functions, and theres are O2 sensors available to talk directly to the pc or tuneboy and it creates map for you, make like a pc wide band oz sensor. sorry if you are already aware of this, I'm just learning the intricacies of EFI