For a 5000 lb suv with all wheel drive, thats not terrible. Also, thats a gen 1 on the srt grand cherokee, the newer ones are quicker. Also, they go a lot faster with a little work. It's a good car to mess with if you have a need for an suv and want to play.
Here is our TBSS on Drag Week (at 22:05):
Once we got it home it went 11.9@116mph w/1.6 60' at over 5100lbs. Shaved off 7 tenths and gained 8mph with cool air and more boost.