Been thinking about free showdown raises

I don't really like the free showdown turn raise here because your outs don't really help.

If you hit the Q, it puts 4 to the straight. If you're worried your ace is beat, pulling trips isn't likely to be good. Either he'll have a house or the ace will make him one. The only time the Ace helps you without helping him (assuming you're beat on the flop) is if he has 2-pair that doesn't use the ace, which puts him exactly on J4, which is unlikely. Finally, the board is double-flush drawn and you don't have either flush draw, so any river card that makes your hand could make him a flush.

I just call down at this point.

Now, if you had a flush draw, or 2-pair draw that didn't put 4 to the board, or a straight draw that didn't have other flushes tainting it, I'd be more interested in the turn raise for a free showdown.