For LWAMI, please see the charts provided with the download for the unique sound vs. speed curves for each playable submarine. In general, the sound vs. speed curves range from +15 (at maxspeed) for SSBN's and quiet diesels, to 20+ for modern nukes, to 25+ for old submarines.
In the stock game, all nuke subs have a 10+ at flank and all diesels have a 5+ at flank speed. So, for example, in the stock game, a standard kilo will make 60 PSL at 0 kts, 65 PSL at 17kts, and 75 PSL at flank speed and cavitating. There is not much of a penalty to going fast in the stock game if you are not cavitating.
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