Improving Ship Speed

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By equipping a Turbine and a Boiler it's possible to make fast destroyers like Shimakaze go speeds far beyond fast. As shown here, using a Improved Kanhon Type Turbine and a New Model High Temperature High Pressure Boiler will result in Shimakaze going to Fastest
By equipping a Turbine and a Boiler it's possible to make a Battleship like Yamato go from slow to fast. As shown here, using a Improved Kanhon Type Turbine (shown in the expansion slot) and an Enhanced Kanhon Type Boiler will result in Yamato going to Fast allowing her access to path branching she would otherwise not have access to when she was Slow.

Speed Speed represents the speed of a ship. Ship are either slow (低速) or fast (高速) by default. Ship speed can be further increased to fast+ (高速+) or fastest (最速) by using Engine Improvement Engine Improvements, usually a combination of a TurbineImproved Kanhon Type Turbine with one or more BoilersEnhanced Kanhon Type Boiler
New Model High Temperature High Pressure Boiler
.

Overview

Ship's speed can take the following values:

  • Slow (低速)
  • Fast (高速)
  • Fast+ (高速+)
  • Fastest (最速) (sometimes "Fast ++")

There are several effects of increasing ship speed:

  • Meeting routing requirements:
    • Fleet speed affect certain map routing.
      • Note that this does not apply to ship type requirements (e.g. a BB will not count as an FBB where FBBs are specifically required).
      • Most map routings are only affected by slow/fast fleets, fast+ and fastest being required for routing in very few maps (e.g. 3-2 and 4-5).
  • Combined Fleet composition:
    • BB/BBV that are fast+ can be placed in the escort fleet of STF/TCF (only fast for Warspite Kai).
  • Evasion increase:
    • Devs claim ([1]) that higher speed values increase evasion, however, no such bonus has ever been measured ([2][3]).
  • Because Coastal Defense Ships (DE) cannot equip   Engine Improvements, they are the only ship type that cannot be speed-up. The only exception is Inagi Kai Ni.

Speed Change Charts

It is highly recommended to have a Reinforcement Expansion on ships that are sped-up. Ships sped up without using a RE will have severely degraded combat efficiency in most cases.

So far, only 2 "boilers" exist in the game, and they are referred to as:

Unless stated otherwise, synergies listed below already include 1 Improved Kanhon Type Turbine , as it is a requirement for almost all speed-ups.

Speed Groups
Base Speed Speed Group Type Exceptions
Fast A CAV
B1 N/A
B2 FBB, CV, CVB, CA, CL, CLT, DD
C AV
Slow A N/A
B BB, BBV, CVL, CT, AS, AO, LHA
C SS, SSV, AR
None DE N/A
Speed exceptions
Ships Speed group Exception Notes
All Fast A +1   Fit Bonus with the +13 Boiler  at 7+   Stackable
All Slow A +1   Fit Bonus with the +13 Boiler  at 7+   & a Turbine 
Houshou Kai Ni/Sen 
 
Slow A +1   Fit Bonus with the +13 Boiler  Not self-stackable
Stackable with above only for +13 Boiler  at 6-  
Inagi Kai Ni  Slow B Not self-stackable and speed capped to fast +
Sentaka Type Slow C Not self-stackable
Yuubari Kai Ni Toku 

Samuel B. Roberts/Kai 
 

Slow B Speed set to Fast when equipping a Turbine  Not self-stackable

Bonus disabled if equipping any "other" variants of   Engine Improvements.

  • Regular speed modding behaviors then.
Amatsukaze Kai/Ni 
 

Shimakaze Kai 

Fast A/B1 Can equip   Boilers 
 
in the RE
Simplified Engine Synergies
 
Speed Increments
Boiler Type Boilers Required
Fast A

Fast B1
Slow A
Fast B2
Slow B
Fast C
Slow C
+1 Any boiler 1
+2 +13  boilers 1 2 2 N/A
+13  boiler
+ +10  boiler
= Total
0+
0+
2
1+
0+
2
0+
0+
3
+3
(Slow A only)
+13  boiler
+ +10  boiler
= Total
N/A 1+
0+
3
N/A
Engine Synergies
  Engine Improvements Speed groups
Fast Slow
A B1 B2 C A B C
Main Slots
Required
Turbine  +10 Boiler  +13 Boiler  +13 Boiler 
7+ 
Houshou K2/Sen 
 
A Inagi K2  Yuub K2T 
SamyB/K 
 
B Sentaka Type C
0 0 0 0 fast slow
0 1 0 0 fast slow fast slow
1+ 0 1+ 0 fast slow
1+ 0 0 1+ 0 fast fast slow fast slow fast slow
1 0 0 0 1 fast + fast
2+ 0 0 0 2+ fast ++
1 1 1 0 fast + fast + fast + fast + fast fast fast
2 1 2 0 fast ++
3+ 1 3+ 0 fast ++ fast +
1 1 0 1 0 fast ++ fast + fast + fast + fast fast + fast fast + fast
2 1 0 2 0 fast ++ fast ++ fast ++ fast + fast +
3+ 1 0 3+ fast ++
2 1 1 1 fast ++ fast + fast ++ fast + fast + fast
3+ 1 2+ 1+ fast ++ fast ++ fast ++ fast +
3+ 1 1+ 2+ fast ++ fast ++ fast ++ fast +
1 1 0 0 1 fast ++ fast + fast + fast + fast + fast + fast fast + fast
2+ 1 0 0 2+ fast ++ fast ++ fast ++ fast +
2 1 0 1 1 fast ++ fast ++ fast ++ fast + fast +

See Also