There are available archive records from Romania in below website. It is in Romanian. You need to register, it is free. Project ended at the end of September. Records available from Bukarest (=Bucuresti) and Brassó (Brasov) county.
As you login, you need to choose a place, year range and archive boxes. If you look for Lutherans in Brassó, you need to scroll down, as the city is appearing twice, and on the second time you can select the community also. Biserica Neagra = Fekete templom (Black church) is the Lutheran church.
And you need to be calm when using this database as it is not familysearch, till it is a very good project. I would say: welcome in the 21st century to the Archives in Romania!