Improving Ship Speed

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 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 Improvements, usually a combination of a Turbine with one or more Boilers
.

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 the Queen Elizabeth-class 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:

• Enhanced Kanhon Type Boiler = +10 Boiler
• New Model High Temperature High Pressure Boiler = +13 Boiler

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	CV(B/L): Shoukaku-class, Taihou, Mogami-class Kou Kai Ni CA: Mogami-class, Tone-class DD: Amatsukaze Kai Ni, Shimakaze, Tashkent AV: Mikuma Kai Ni Toku
	B1	N/A	FBB: Kongou-class, Yamato Kai Ni, Iowa-class CV: Souryuu, Hiryuu, Unryuu, Amagi CL: Agano-class DD: Amatsukaze/Kai
	B2	FBB, CV, CVB, CA, CL, CLT, DD	CVL: Ryuujou, Ryuuhou Kai Ni, Shouhou-class, Chitose-class Kou, Independence-class
	C	AV	CV: Kaga CL: Yuubari/Kai DD: Samuel B. Roberts Mk.II
Slow	A	N/A	BB(V): Yamato-class, Nagato-class Kai Ni CVL: Houshou Kai Ni/Sen
	B	BB, BBV, CVL, CT, AS, AO, LHA	FBB: Gangut CL: Yuubari Kai Ni Toku DD: Samuel B. Roberts/Kai DE: Inagi Kai Ni AV: Mizuho, Akitsushima, Commandant Teste, Kamoi Kai AR: Asahi Kai
	C	SS, SSV, AR	AO: Hayasui LHA: Akitsu Maru
	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

• Stats