and now when i figured it out i want to share it . . .
You need only Cheat Engine [download it from here:

So lets start , run silkroad and then cheat engine. At the top left you can see computer, click on it, find sro_client.exe and press ok. Now at the bottom right click "Add address manually". Put 9F3A40 in address and change type to float.
Now you can easily see at list value of autoselect range [its 70 by default] click it with right mouse button, then go to "change record ---> value" and set your range. . . simply click on save, and thats all . .
It's 100% safe and working ^^
Credits for address to lolkop and for idea to maxes11.