easy: you go to this site
http://www.staryards.com/tools.htm and download shipedit 3
install shipedit 3, go to this site again, and you'll see Shipedit beta for OP, download that too, extract the archive at the place where you installed ShipEdit3.
You will open ShipEdit39902b.exe , you click on the "File" tab, you click on Open and go to: op directory\assets\specs\shiplist.txt and click open
Now you select the specified ship you wanna edit, and go to the Power/Systems tab and modify the R/L Warp, Center warp, impulse, APR ,and battery.
you put any value you want but on the limit... IIRC it's 127 on all 5 of'em .
Good luck