Category:Engine Improvements

This category contains all equipment classified as Engine Improvements.

This category is populated by Template:EquipmentCategoriesKai. Please do not manually add pages to this category.

Mechanics

Ship Speed can be increased to Fast, Fast+, or Fastest by using a combination of "Turbine" and "Boilers".

See the following tables for details (most synergies listed include 1 turbine as it is an common requirement):

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
Speed Increments	Boiler Type	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
+2	+13 boiler + +10 boiler = Total	0+ 0+ 2	1+ 0+ 2	0+ 0+ 3	N/A
+3 (Slow A only)	+13 boiler + +10 boiler = Total	N/A	1+ 0+ 3	N/A

Most of the stats comparisons indicated here are irrelevant, see Improving Ship Speed to get the full picture.

No.	Rarity	Name	Equipment Type		Refittable Types			Notes
33	☆	Improved Kanhon Type Turbine 改良型艦本式タービン	Engine Improvement	6	DE (Only: Inagi Kai Ni), DD, CL, CLT, CA, CAV, CVL, FBB, BB, BBV, CV, SS, SSV, AV, LHA, CVB, AR, AS, CT, AO	✔️	❌
34	☆ ☆	Enhanced Kanhon Type Boiler 強化型艦本式缶		10		✔️	✔️
87	☆ ☆ ☆	New Model High Temperature High Pressure Boiler 新型高温高圧缶		13		❌	✔️
No.	Rarity	Name	Equipment Type		Refittable Types			Notes