Improvement

"Improvements" are increases in performance for equipment, being represented using stars.

Improvements are notably done via "Akashi's Improvement Arsenal", requiring Akashi and Improvement Materials , or may be already present on the equipment when obtained.

• See how to perform improvements here.
• See the full list of improvable equipment here (this omit the equipment not improvable but obtainable already improved) .
  • For a comprehensive list, please refer to Akashi-List.
• See the full list of ship Helpers here.

Overview

1. Improvement levels are displayed beside equipment names.
   • They run from +1 to (+10).
2. Improvement bonuses are hidden stat increases. The increase in stats is not reflected on ship girls' stat cards.
   • This means they do not count for reaching certain thresholds like for OASW.
   • Those bonuses work to some extent to reach regular Expeditions thresholds (see here).
     • For Support Expeditions, only the FCA bonuses do work, with any damage, accuracy, and fighter power bonuses notably not working.
   • Some improvements on equipment can also add some additional Visible Fit Bonuses, or even affect the RE's equipability.
     • This works on an equipment-to-equipment and ship-to-ship basis with no general rule.
3. Most conversion quests (e.g. F62), allow to use improved equipment, but any are lost during conversion.
4. Certain conversion quests that do not require improved equipment, will carry over any from the required equipment to the upgraded equipment.
   • So far, this is only applicable to quests F13, F14, F19, F24, F26, F28, F29, F30, Fm1, and Fm2.
   • This is currently the only way to obtain improved versions of the Tenzan Model 12 (Tomonaga Squadron), Suisei (Egusa Squadron) & Reppuu (601 Air Group) (through F13-14-15 respectively, unimprovable otherwise).
5. Improved equipment cannot be used as fodder via Akashi's Improvement Arsenal.
6. Improved equipment can be used in ship Remodeling (Yamato Kai Ni only so far).

Improvement Bonuses

The bonus stats gained from improvement will vary depending on the type of equipment as well as the stat itself.

• Most improved stats will come as decimal numbers, due to how square roots work.
• It is important to note that decimals must not be discarded in favor of whole numbers, as stats will be multiplied by various formulas anyway, to finally be rounded down/up.
• For calculated improvement bonuses, please refer to the Categories Charts.

The improvement effects are unknown/unclear for some equipment types/cases.

Square Rooted Bonus

Most bonuses are all a function of the square root of the improvement level. The bonus can be calculated by:

[math]\displaystyle{ \text{Bonus}_\text{stat} = \sum_{\text{All equips}} \text{Mod}_\text{equip} \sqrt{\bigstar} }[/math]

With

• [math]\displaystyle{ \bigstar }[/math] the improvement level of the equipment.
• [math]\displaystyle{ \text{Mod}_\text{equip} }[/math] the equipment modifier for that stat, described below:

Equipment Type		Day Battle		Night Battle	ASW	AA		Fighter Power	LoS	Accuracy				Evasion
		Firepower	Torpedo			Ship	Fleet			Day	Night	Torpedo	ASW	Shelling	Torpedo
Main Guns	(Very) Large Sp	1.5	-	1	-	-	-	-	-	1	1.3	-	-	-	-
	Medium/Small (Red)	1	-	1	-	-	-	-	-	1	1.3	-	-	-	-
	HA (Green) Main	1	-	1	-	2 (≤7) 3 (≥8)	2 (≤7) 3 (≥8)	-	-	1	1.3	-	-	-	-
Secondary Guns	90 mm Single HA Sec	1	-	1	-			-	-	1	1.3	-	-	-	-
	(Large) HA (Green) Sec Sp_Sec	Linear: 0.2 (≤3) 0.3 (≥5)	-	Linear: 0.2 (≤3) 0.3 (≥5)	-			-	-	1	1.3	-	-	-	-
	Surface (Yellow)		-		-	-	-	-	-	1	1.3	-	-	-	-
	15.2 cm Single & OTO	1	-	1	-	-	-	-	-	1	1.3	-	-	-	-
Anti-Aircraft Fire Directors		1	-	1	-	2 (≤7) 3 (≥8)	2 (≤7) 3 (≥8)	-	-	1	1.3	-	-	-	-
Anti-Air Guns		1	1.2	-	-	4 (≤7) 6 (≥8)	-	-	-	-	-	2	-	-	-
Torpedoes		-	1.2	1	-	-	-	-	-	-	1.3	2	-	-	-
Midget Submarines Minisub		-	-	1	-	-	-	-	-	-	1.3	-	-	-	-
(Large) Carrier Recons/Large Flying Boats Sp		-	-	-	-	-	-	-	1.2	-	-	-	-	-	-
LB Recons LB		-	-	-	-	-	-	-	1.2?	-	-	-	-	-	-
Seaplanes	Recons	-	-	-	-	-	-	-	1.2	-	-	-	-	-	-
	Bombers	-	-	-	-	-	-	-	1.1	-	-	-	-	-	-
Rotorcraft/Liaison Aircraft		-	-	-	Linear	-	-	-	0 1	1?	1.3?	-	-	-	-
Night Planes SwordfishPhoto Iwai		-	-	1	-	-	-	-	-	-	-	-	-	-	-
Land Based Bombers	Attackers/Assault/ASW/Heavy Bombers	-	0.7*both and [11]	-	-	-	-	0.5	-	-	-	-	-	-	-
	Hayabusa bomber bomber	-	0.7*only against DD and Installation [12]	-	-	-	-		-	-	-	-	-	-	-
Radars		-	-	-	-	-	0 Surface 1.5 Air	-	1.25 Small 1.4 Large	1 (≤2) 1.7 (≥3)	1.3 (≤2) 1.6 (≥3)	-	-	-	-
T95 DC & T2/K2 DC		-	-	-	1	-	-	-	-	-	-	-	-	-	-
Depth Charges		0.75	-	-		-	-	-	-	-	-	-	1.3	-	-
Sonars			-	-		-	-	-	-	-	-	-		-	1.5
Engine Improvements		-	-	-	-	-	-	-	-	-	-	-	-	1.5
Submarine Equipments		-	-	-	-	-	-	-	-	-	-	-	-	1.5	-
Shells/Searchlights/Lookouts/Landing Equipment Command Facilities/Aviation Personnels		1	-	1	-	-	-	-	-	1	1.3	-	-	-	-
Anti-Ground Rockets Smoke Generators		1	-	1	-	-	-	-	-	1?	1.3?	-	-	-	-

Linear Bonus

Some bonuses have a linear growth. The bonus can be calculated by:

[math]\displaystyle{ \text{Bonus}_\text{stat} = \sum_{\text{All equips}} \text{Mod}_\text{equip} \times \bigstar }[/math]

With

• [math]\displaystyle{ \bigstar }[/math] the improvement level of the equipment:
• [math]\displaystyle{ \text{Mod}_\text{equip} }[/math] the equipment modifier for that stat, described below:

Equipment Type		Fighter Power	Dive Bomb	Torpedo	ASW	Armor
Submarine Torpedoes Sub		-	-	0.2	-	-
Fighters/SPF/LB Fighters		0.2	-	-	-	-
Mod 64 Zero AS		0.3	-	-	-	-
Fighter-Bombers		0.25	-	-	-	-
Mod 64 Zero FB KMX			-	-	0.2	-
Mod 64 Zero FB Sk		0.3	-	-		-
Dive Bombers (ex. FB)		-	0.2	-		-
Torpedo Bombers		-	-	0.2		-
Seaplane Bombers Bomber		-	0.2	-	-	-
Rotorcraft		-	-	-	0.2 (≤10) 0.3 (≥11)	-
Liaison Aircraft		-	-	-	0.2 (≤7) 0.3 (≥8)	-
Extra Armor	Medium	-	-	-	-	0.2
	Large	-	-	-	-	0.3

Averaged Bonus

The average is counted using all craft on the ship for anti-installation, and all "working" craft in the fleet for expeditions.

All the following bonuses are part of bigger formulas:

• See Anti-Installation for more details,
• See Expedition for more details.

Equipment Type		Anti-Installation Bonuses		Expedition Bonus
		A1	C
Landing Craft		1 + (Average /50)	[1 + (Average /50)]N	1 + (Average /100)
Amphibious Vehicles	Ka-Mi tank	1 + (Average /30)	1 + (Average /30)
	Ka-Tsu tanks	1 + (Average /50)	[1 + (Average /50)]N
Landing Forces		-

Misc Bonuses

The following bonuses are part of bigger formulas.

See Smoke Generators for more details.

Equipment		Smoke Trigger Rate	Smoke Level
Smokes	Smoke Generator (base)	[math]\displaystyle{ \text{K} = +0.3 \times \bigstar }[/math]	Increased 2 smokes at can trigger level 3 smoke
	Smoke Generator (Kai)	[math]\displaystyle{ \text{K} = +0.5 \times \bigstar }[/math]

See Support Expeditions for more details.

Equipment	Support Fleet Trigger Rate
FCA	+2 %/ for the 2nd roll

See Improving Ship Speed for more details.

Equipment	Speed
+13 Boiler	Fast A group: +1 Fit Bonus at 7+ Slow A group: +1 Fit Bonus at 7+ (& a Turbine)

See Saury fishing for more details.

Equipment	Saury fishing
Type 96 150cm Searchlight	Increased at 8+

It is confirmed that none of the usual stats, probably nothing at all, is given to the following equipment types:

Equipment Type	Effect	Notes
Combat Rations	"Nothing"	So far, Onigiri improvement only serves to upgrade into Special Onigiri. Since improving a Combat Ration up to +6★ cost 0 screw, it is possible to farm some screw by upgrading a ration once a day while doing quest Fd6.

Myths

The following have been confirmed to be negative.

• on Searchlights do NOT increase:
  • Night Cut-In rate of neither fleets,
  • Targeting rate.
• on Lookouts do NOT increase Night Cut-In rate,
• on Submarine Equipments do NOT increase Night Cut-In rate .

Visible Fit Bonuses

The following equipment provide additional Visible Fit Bonuses to some ships when improved:

Equipability

The following equipment have enhanced equipability when improved:

Type	Equipment	Minimum Level	RE Equipability
Small	Passive Radiolocator (E27) + Type 22 Surface Radar Kai 4 (Calibrated Late Model)	+4	FBB: Kongou-class Kai Ni B/C DD: Kagerou-class, Yuugumo-class, Matsu-class, Shimakaze Kai, Shigure Kai San, Harusame Kai Ni
Large	FuMO25 Radar	+7	FBB: Bismarck-class CA: Admiral Hipper-class
Medium	Arctic Camouflage (+ Arctic Equipment)	+7	FBB: Gangut-class CL/T: Tama, Kiso, Abukuma, Gotland, Kirov-class DD: Tashkent AO: Ootomari
Small	12.7cm Single High-angle Gun Mount Kai 2	+7	DD: Fubuki Kai Ni+, Ayanami Kai Ni, Ushio Kai Ni, Akatsuki Kai Ni, Hatsushimo Kai Ni, Shigure Kai Ni+, Yuudachi Kai Ni, Isokaze B Kai, Yukikaze Kai Ni

Resource Node Bonus

Uniquely on the Resource Nodes of 1-6 and 3-5, improvements slightly increase resource gains.

Special Resource Nodes Gain Modifiers Type 2
Equipment / Ship				Bonus Gains (per DLC / Ship)
Type			Name	1-6					3-5
				N	G	G	M	M	J	J
	A	1	Toku Daihatsu Landing Craft	0.0	6.00	0.3800?	12.00	0.??	24.00	0.??
		2	Ka-Tsu Tank Kai		5.50	0.??	11.00	0.??	22.00	0.2??
		3	Daihatsu Landing Craft		5.00	0.0350?	10.00	0.??	20.00	0.??
		4	Ka-Tsu Tank		4.50	0.??	9.00	0.??	18.00	0.2??
		5	Armed Daihatsu		2,50	0.0720?	5.00	0.??	10.00	0.??
		6	DLC + T89 Tank DLC + Panzer II		1.50	0.0100?	3.00	0.??	6.00	0.??
		7	Soukoutei Toku DLC + Ho-Ni Tank		1.10	0.0200?	2.20	0.??	4.40	0.??
		8	Ka-Mi Tank		0.75	0.0041?	1.50	0.??	3.00	0.??
	B		Drums		0.0	N/A	0.0	N/A	10.0	N/A
	C		Toku DLC + 11th Reg M4A1 DD Toku DLC + Panzer III Toku DLC + Chi-Ha Toku DLC + Chi-Ha Kai Toku DLC + Panzer III J		0.0
Ship			Kinu Kai Ni		5.0	N/A	10.0	N/A	20.00	N/A
			Other Ships		0.0		0.0		0.0
Resource Cap				N/A	40		80		150
Random Resource Increments				N/A	0		0		0
Star Bonus [math]\displaystyle{ \text{Bonus}_\text{Star} = \sum_\text{All Types} \text{N}_\text{Type}^2 \times \sqrt{\text{N}_\text{Star Type} } \times \text{Star Bonus}_\text{Type} }[/math] With [math]\displaystyle{ \text{Bonus}_\text{Star} }[/math] the total bonus resource gain bonus for the fleet, [math]\displaystyle{ \text{N}_\text{Type} }[/math] the number of craft of a given type (A1 to A6), [math]\displaystyle{ \text{N}_\text{Star Type} }[/math] the total number of stars on a given type, [math]\displaystyle{ \text{Star Bonus}_\text{Type} }[/math] the bonus given by stars of each type. Notes: Sources: [13] [14] [15] [16] [17]

Expeditions Bonus

For expedition stats requirements, improvements are globally simplified, overwriting the above-mentioned improvements.

• See here for more details

See Also

• Akashi's Improvement Arsenal
• Improvement/Categories
• Improvement/Helper
• Help:Akashi Upgrades
• https://akashi-list.me/