Improving Ship Speed

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Equipping a Turbine and a Boiler make fast DD like Shimakaze go to speeds beyond fast. Here, using a Turbine and a +13 Boiler results in Fastest speed.
Equipping a Turbine and a Boiler make a BB like Yamato go from slow to fast. Here, using a Turbine (in the RE) and an +10 Boiler results in Fast speed.

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