When I bought my car it had an MBC on, this has now been removed and is about to replaced by a EBC in the future. In the mean time while the car is running standard boost should the T-VSV be disabled or enabled for the best?
"for the best" yes, but that kind of depends on how long it'll be until you have an EBC fitted. If it's only going to be a few days/weeks I wouldn't bother. If it's going to be months then yes, you're probably better off reinstating the TVSV.