All I know is that they use Mitsubishi made Type 89 and Type 80 torpedoes. Navweaps have some info, but I assume you’ve already seen it: http://www.navweaps.com/Weapons/WTJAP_PostWWII.htm

Yes, it is a good source of information. Info from Internet is traced there. I have written on one of Russian forums the data on torpedoes 53-65М and 53-65К, and they have appeared on Navweaps soon.

However, if on Type 80 speed over 30 knots is quite authentic, on Type 89 – 70 knots – is not true. The best Russian electric torpedo USET-80 (TE-2) has speed up to 50 knots at range up to 20 km. Obviously close characteristics should have Type 89, that was coordinated to characteristics of torpedo Mk 48 mod. 4.

Regards,
Heyerdahl