Hi mates, this is first time here after been working for first year with this epic tool, Zbrush as student.
I´m having problems with the DynaMesh, normally the DynaMesh on a basic star of 14 polys results on 10 k Polys with 128 resolution, ok.
Now im applying on a 85k mesh, and results on a 28 polys, with 256 res. And the Values of the Dynamesh reach till 4k.
I tryed to do the same on a 4R6 and 4R7.
Thanks for all the replies.
DynaMesh is not designed for detail sculpting. It’s meant as a way to quickly rough out shapes. When you are satisfied with the overall shape, then you divide and sculpt like normal without DynaMesh.
If you do need to come back to DynaMesh later you can do so by duplicating the SubTool and using DynaMesh. Revise your shape on the duplicate and when done, divide it again before projecting the detail from the original to the new version.
Thanks for reply, the problem was that Dynamesh were doing a very very low poly, so I couldnt use the “non detail” mesh for proyections, because the low poly. I exported from 4R7 subtool by subtool to 4r6 and I could do a better DynaMesh.
Thanks for you attention. 
the resolution of your tool is related to the setting, and the size of the tool. You may need to increase the scale of your tool if you’re not getting high enough resolution.