Improving Ship Speed

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 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 (eg. 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 (eg. 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 sped-up.

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
	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 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-
I-201-class	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 Improvement . 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+ 2
+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	Yuub K2T SamyB/K	B	I-201-class	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
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
2	1	0	2	0		fast ++	fast ++		fast ++	fast +	fast +
3+	1	0	3+							fast ++
2	1	1	1			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
2+	1	0	0	2+		fast ++	fast ++		fast ++		fast +
2	1	0	1	1		fast ++	fast ++		fast ++	fast +	fast +

See Also

• Stats