I am looking for any mods that add more or less lore accurate tamriel landmasses or quests that have to do with tamriel lore.

so far i Have tamriel rebuilt 1 and 2 and silgrad tower though i'm not sure if its the latest one I have heard of one called blacklight and another that adds the velothi mountains but haven't found them. Do yall have any recomendations?

There are several projects in the works for doing this. Project Cyrodiil and Skyrim are two that I know off the top of my head... However, they are still being worked on. I don't think there's anything released (that you haven't mentioned) yet though.

There was a project to add Blackmarsh (or Argonia) by zackG, but it was cancelled, because the laptop which held all the data was stolen, and there were no backups online. I think I read something about a Valenwood project, too, but I can't find any info. Might even got cancelled as well. Other then that there are no projects to my knowledge which add any lore accurate landmasses to the game.

By the way, TR released an alpha of map 4, but it is incompatible to map 1&2. It's really not something you play with, but it's nice to explore a bit.

http://provincecyrodiil.com/portal.php will create the Cyrodiil landmass for the TES: III engine and timeframe. We have not yet released anything, but keep your eyes peeled for the Isle of Stirk (an island that is part of Cyrodiil but was left out of Oblivion, it is off the Gold Coast) as we are making headway with exterior building and have already completed most of the models needed for the town.

http://shotn.com/forums/ will create the Skyrim landmass for TES: III engine and timeframe. Currently we are going over interior fixing and creation as we move towards releasing a portion of the hold known as The Reach. I have no time table for this, but rest assured it wont be that much longer.

http://tamriel-rebuilt.org/forum/index.php is already widely known throughout the TES: III community as being the project that aims to finish the Morrowind landmass. We are getting closer to releasing our Sacred East map and as some have pointed out we have an alpha map of exterior work extending beyond SE. Once completed your use of Silgrad Tower will no longer be compatible with TR. Also, as you say you are looking for lore based mods I would drop ST anyway as it is far from being as lore backed as TR.

The Valenwood project that schallwert mentions is not dead, but don't expect to see much from it anytime soon. The modder that is in control of the Valenwood heightmap is currently on the other landmass teams (or most of them anyway) and as such is not moving ahead with the speed of other projects. I imagine that once some of the other landmass mods are closer to completion he will start working more so on the land of the Bosmer, but as of now it is moving along rather quietly and without much outside help.

Argonia was indeed a project that ZackG was undertaking. It has been lost (along with many models for P:C) and the project abandoned...for now. Recently ZackG has been showing up around the P:C website and has begun to model a few things again. Perhaps he will retake the charge to build Argonia, but even if that is not the case I feel very confident that Argonia will be created for the TES: III engine sooner rather than later. (I personally find the province intriguing and if it has not been started anew before Cyrodiil is finished I may take the reigns and form a team to create the province.)

Also there is the landmass called Lyithdonea that Melchior Dahrk is creating. While it is not backed specifically by Bethesda lore, MD has created lore of his own that fits in well with the established realm of Tamriel. This is a mod to keep an eye on.