I (think) the arming distance for torpedoes is about 400yds early war and 350yds after mid 1943. As far as the map contact updates, if you're saying that you have them turned off, well, that's why you have no updates. If they are turned on and you still have no updates, I believe there is a mod available that restores the sonar lines in RFB 2.0, though I don't have the link at this moment. I hope this helps some. You won't actually see the ships until you have radar and, even then, I don't remember if they even show up in RFB.
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-Pontius Pilate
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