Help:Akashi Upgrades

Introduction

This article aims to provide a rough guide to help you decide on what to spend screws on. Because most improvement bonuses are "square-rooted", the first upgrade provides the largest relative gain per screw, therefore it is critical to get relevant important equipment to +1 before working on others. Please refer to:

• Improvement for more details on the stat bonuses,
• Akashi-List for the costs involved.

The Breakpoint Myth

Breakpoints refer to points where upgrade bonuses reach whole numbers. These points are stressed because of the way the game rounds down the results of most formulas. The misconception is that a 1.99 bonus is just as good as a 1.00 bonus because of rounding. While there is a slight grain of truth to the myth, things get a little complex in practice. Due to how many multipliers and other bonuses are involved, trying to hit equipment upgrade breakpoints doesn't affect very much in the grand scheme of things.

The most important thing to do is to upgrade your equipment to certain critical points:

• +1 : Provides the biggest power increase (square-rooted only).
• +6 : The point when failures start to kick in and costs take a jump.
•  : The final step to maximize upgrade bonuses.

Screw Guaranteeing/Saving

In most cases, it is statistically cheaper to either toggle or not the "guaranteed improvement".

Reminder :

Modification Level	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★	Upgrade
Akashi	100%	100%	100%	100%	95%	90%	80%	77%	72%	60%	50%
Akashi Kai	100%	100%	100%	100%	100%	95%	90%	82%	77%	67%	62%

Average screw cost when not guaranteed, assuming Akashi is Kai and not counting any equipment cost:

As expected, when the guaranteed cost is too high, not guaranteeing the upgrade is on average cheaper screw-wise, but this is not counting any potential equipment that may be lost and so may imply a higher screw cost.

Guaranteeing worthiness per base upgrade screw cost can then be defined as followed:

When upgrading any equipment, Devmats and Screw are consumed, and eventually one or several equipment and consumables.

• Since obtaining Devmats is not an issue, their cost is simply ignored.
• Since failing an upgrade does not consume any consumables, they are ignored.
• For equipment consumed :
  • If they are craftable or relatively easy to obtain, their cost is negligible in front of any screw cost.
  • If the equipment consumed is a very rare one, then guaranteeing the upgrade should be evident.
  • If the equipment consumed is itself made via Akashi's upgrades, then its total screw cost must be added to the base screw costs used in later examples.

guaranteed cost	1st time guaranteeing is worth it (in )
0	6th
1+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
1	6th
2+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
2	6th
3
4+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
3	6th
4	8th
5+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
4	6th
5	8th
6
7+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
5	6th
6	7th
7	9th
8
9+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
6	6th
7	7th
8	9th
9
10+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
7	6th
8	7th
9	8th
10	9th
11
12+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
8	6th
9	7th
10	8th
11	9th
12
13+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
9	6th
10	6th
11	8th
12	9th
13	9th
14
15+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
10	6th
11	6th
12	7th
13	9th
14	9th
15
16
17+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
11	6th
12	6th
13	7th
14	8th
15	9th
16	9th
17
18+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
12	6th
13	6th
14	7th
15	8th
16	9th
17	9th
18
19
20+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
13	6th
14	6th
15	7th
16	8th
17	9th
18	9th
19	9th
20
21+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
14	6th
15	6th
16	7th
17	7th
18	8th
19	9th
20	9th
21
22
23+	Never

guaranteed cost	1st time guaranteeing is worth it (in )
15	6th
16	6th
17	7th
18	7th
19	8th
20	9th
21	9th
22	9th
23
24
25+	Never

There is only one equipment with a base brut screw cost above 15 (the SK Radar), and as every equipment consuming expensive "Akashi exclusive" or rare equipment, the average screw cost is less important that the raw cost, meaning that guaranteeing the upgrade is always worth it

Improvement Guide

The following guide was made by few players and has not been scrutinized enough. Beware of potential biases.

Several rankings for equipment improvements. Do note that:

• Equipments to upgrade/improve are ranked from most advisable at 1, to least advisable at 10.
• Many equipment possibly improbable are omitted, as they are either:
  • Already listed in one of the lists,
  • Are obtainable elsewhere for cheaper,
  • Are just not worth improving or upgrading.
• Some equipment can be in several lists.

Quests Improvements

Several Quests require specific equipment to be upgraded in order to be completed, while others simply allow the use of upgraded equipment for conversion.

Quests Requirements

Here is the list of equipment that required to be improved to complete some quests:

• All improvements are lost during conversions.

Ultra Highly Advised

It is highly recommended to improve the following equipment to before proceeding with those quests as any are carried over to the reward , and the rewards cannot be improved afterward!

Highly Advised

In those quests, any the equipment has, are carried over to the reward. It is therefore advised to upgrade the equipment before completing the quest, as it is cheaper to do so.

Highly Advised

Quest	Equipment	Notes
F19	Type 97 Torpedo Bomber (Murata Squadron)	Not improvable yet
F24	Type 0 Fighter Model 21 (Skilled)	It is advised to start improvements with Fm1 for this chain.
F26	Type 0 Fighter Model 52 (Skilled)
F27	Zero Fighter Model 52C (w/ Iwai Flight) Best obtainable fighter in the game
F28	Type 0 Fighter Model 21 (Skilled)	It is advised to start improvements with Fm1 for this chain.
F29	Zero Fighter Model 21 (w/ Iwamoto Flight)
F30	Zero Fighter Model 52A (w/ Iwamoto Flight)
Fm1	Type 0 Fighter Model 21	Is the start of most improvement quests chains
Fm2	Type 0 Fighter Model 21 (Skilled)	It is advised to start improvements with Fm1. Good LBAS fighter with 7 range

Traps

Some quests allow the use of upgraded equipment for completion, but will not keep any of the current equipment improvements, and so should be cleared with unimproved equipment:

Collection Improvements

Some equipment are only obtainable via Akashi upgrades.

• The list can be found here
• If completing the Kancodex is a personal goal, then crafting those equipment becomes a necessity in the long run.
• Making all those equipment should NOT be a priority over the rest, as most are not very useful or even useless.
• See below for when making those equipment overlap with advised improvements.

Upgrade Advice

Here is a list of improvements that have as a main goal to "upgrade" said equipment into a better one.

• Do note that certain upgrades can be done in chains, with part of the chain ranging from worse than the upgrade, equivalent to, or even better.
• The "Total Srew Cost" is given as an indication, but does not reflect "real" with guaranteeing savings and consumed equipment being great factors to take into account.
• Several good equipment are not listed there as they can be obtained otherwise more cheaply, or because the upgrade is just not worth it.

Upgrade Advice

Priority Level	Equipment Goal	Equipment To Upgrade	Total Srew Cost	Further Improvable?	Other Sources	Notes
6	41cm Triple Gun Mount Kai	Prototype 41cm Triple Gun Mount	69	Yes	N/A	A good gun for BB(V), further upgradable. The Prototype 41cm is also useful in the making
8	41cm Twin Gun Mount Kai 2	41cm Triple Gun Mount Kai	92	Yes	B130	A good gun for BB(V), especially IJN ones The 41cm Kai is also useful in the making Consumes 1 Prototype 46cm Twin Gun Mount
6	41cm Triple Gun Mount Kai 2	41cm Triple Gun Mount Kai	93	Yes	F74	A good gun for BB(V), especially IJN ones The 41cm Kai is also useful in the making
2	12cm 30 Tube Rocket Launcher Kai 2	12cm 30-tube Rocket Launcher	40	Yes	B114	Needed to trigger the "AARB" that negate some plane damages A goal is to 6, enough to equip a full "carrier fleet".
2	Type 2 Seaplane Fighter Kai	Type 0 Reconnaissance Seaplane	40	Yes	B88	Good to maintain airpower without carriers The goal is to have at least 6 good SPF
3	Kyoufuu Kai	Type 2 Seaplane Fighter Kai	77	Yes	B95, B167	Great to maintain airpower without carriers The T2 SPF Kai is also useful in the making The goal is to have at least 6 good SPF
2	Type 1 Armor Piercing Shell	Type 91 Armor Piercing Shell	22	Yes	B31, B32	Good AP shell improving some Artillery Spotting, cheap to make
10	Type 1 Armor Piercing Shell Kai	Type 1 Armor Piercing Shell	35	Yes	N/A	The best AP shell improving some Artillery Spotting, but extremely expensive
1	Special Type 2 Amphibious Tank	Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)	39	Yes	F33	Great against Installations in all cases, and can serve for resource farming
1	Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)	Daihatsu Landing Craft	24	Yes	N/A	Great against Installations in all cases
4	Toku Daihatsu Landing Craft	Daihatsu Landing Craft	29	Yes	B85	Good for Expeditions, increasing the gains
5	Armed Daihatsu	Daihatsu Landing Craft	23	Yes	N/A	Great against Installations and PT Imps Consumes a Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)
5	F6F-5	F6F-3	70	Yes	N/A	A +10 airpower fighter, great to reach air superiority
7	Type 0 Fighter Model 64 (Skilled Fighter-bomber)	Type 0 Fighter Model 64 (Air Superiority Fighter Specification)	70	Yes	N/A	Good all round fighter-bomber with AAR
5	Shiden Kai 4	Shiden Kai 2	59	Yes	N/A	+10 airpower fighter, great to reach air superiority
8	Seafire Mk.III Kai	Spitfire Mk.V	49	No	N/A	Good fighter, with bonuses in some "European Events"
3	Spitfire Mk.V	Spitfire Mk.I	33	Yes	N/A	Great interceptor, further improbable, with bonuses in some "European Events"
6	Re.2005 Kai	Re.2001 CB Kai	60	No	N/A	+11 airpower fighter, with bonuses in some "European Events"
10	Re.2001 CB Kai	Re.2001 OR Kai	49	Yes	N/A	Only used to make the Re.2005 Kai
10	Fulmar (Reconnaissance Fighter/Skilled)	Fulmar	39	No	N/A	Only useful in some "European Events"
9	Type 99 Dive Bomber Model 22 (Skilled)	Type 99 Dive Bomber Model 22	36	Yes	N/A	A medium Anti-Installation dive-bomber
6	SB2C-3	SBD-5	43	No	N/A	Good Anti-Installation dive-bomber, with bonuses in some "European Events"
8	Prototype Type 97 Torpedo Bomber Kai (Skilled) No. 3 Model E (w/ Type 6 Airborne Radar Kai)	Type 97 Torpedo Bomber (Skilled)	45	No	N/A	A good night bomber
10	Tenzan Model 12A	Tenzan	34	Yes	B169	Ok torpedo bomber, mostly used to improve the Type 1 Land-based Attack Aircraft Model 22A
9	Tenzan Model 12A Kai (w/ Type 6 Airborne Radar Kai)	Prototype Type 97 Torpedo Bomber Kai No. 3 Model E (w/ Type 6 Airborne Radar Kai)	63	No	B154, B169	Best craftable night bomber
5	Jet Keiun Kai	Prototype Keiun (Carrier-based Reconnaissance Model)	86	No	N/A	A Jet, coming with unique behaviors and great stats
8	Type 2 Two-seat Fighter Toryuu Model C	Type 2 Two-seat Fighter Toryuu	33	Yes	N/A	OK interceptor, mostly a step towards the Ki-96
3	Ki-96	Type 2 Two-seat Fighter Toryuu Model C	38	Yes	N/A	Best craftable interceptor
8	Ki-102 B	Ki-96	60	No	N/A	Good LBB stat-wise, but with low range
5	Type 1 Fighter Hayabusa Model III A	Type 1 Fighter Hayabusa Model II	39	Yes	N/A	Good interceptor
6	Shiden Kai (343 Air Group) 301st Fighter Squadron	Shiden Model 21 Shiden Kai	71	No	N/A	Great interceptor
7	Do 217 E-5 + Hs293 Initial Model	Do 17 Z-2	63	No	N/A	A great LBB with AAR but with low range, with bonuses in some "European Events"
10	Type 1 Land-based Attack Aircraft Model 34	Type 1 Land-based Attack Aircraft Model 22A	56	Yes	B154	Best craftable LBB, but is the most expensive equipment in the game: Consumes 8 Tenzan Model 12A
7	Type 4 Heavy Bomber Hiryuu (Skilled)	Type 4 Heavy Bomber Hiryuu	72	No	N/A	A great LBB with AAR but with low range
10	12cm Single Gun Mount Kai 2	12cm Single Gun Mount	19	Yes	N/A	A good very niche small gun
9	Prototype Long-barrel 12.7cm Twin Gun Mount Model A Kai 4	12.7cm Twin Gun Mount Model A Kai 2	38	Yes	B179	A good very niche small gun, with great bonuses on some IJN ships
3	5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37	5inch Single Gun Mount Mk.30 Kai	101	No	N/A	Best AACI small gun, with high AA, and required in some AACI
9	12.7cm Twin Gun Mount Model C Kai 3	12.7cm Twin Gun Mount Model C Kai 2	34	Yes	B184, B192	A good small gun, with great bonuses on some IJN ships
5	14cm Twin Gun Mount Kai	14cm Twin Gun Mount	17	Yes	B140, F118	Great medium gun on some IJN ships with fit bonuses Rarely more than 4 are needed
3	15.2cm Twin Gun Mount Kai 2	15.2cm Twin Gun Mount Kai	44	Yes	B164, B168, C57	Best CL gun, with good FP and great Acc
3	15.2cm Twin Gun Mount Kai	15.2cm Twin Gun Mount	36	Yes	Noshiro Kai Ni, F118	Best CL gun in the game, with good FP and great Acc
9	15.5cm Triple Gun Mount Kai	15.5cm Triple Gun Mount	34	Yes	N/A	Good CL gun with higher FP
8	15.5cm Triple Secondary Gun Mount Kai	15.5cm Triple Secondary Gun Mount	34	Yes	N/A	Good surface secondary gun, especially for CLT or in cases of air parity or worse
5	15.5cm Triple Secondary Gun Mount Kai 2	15.5cm Triple Secondary Gun Mount Kai	53	No	B181, B182 x2	Best surface secondary gun, especially for CLT or in cases of air parity or worse
10	8inch Triple Gun Mount Mk.9 mod.2	8inch Triple Gun Mount Mk.9	42	Yes	N/A	Best cruiser gun for FP, useful on CA in Main Combined Fleets
7	35.6cm Triple Gun Mount Kai (Dazzle Camouflage)	35.6cm Twin Gun Mount (Dazzle Camouflage)	43	Yes	N/A	Great gun for FBB, with good stats, especially Acc
6	35.6cm Twin Gun Mount Kai 3 (Dazzle Camouflage)	35.6cm Triple Gun Mount Kai (Dazzle Camouflage)	70	Yes	B190, C74	Great gun for FBB, with good stats, especially Acc
9	16inch Mk.VIII Twin Gun Mount Kai	16inch Mk.V Twin Gun Mount	56	Yes	N/A	Good gun for BB(V) with medium stats
10	38.1cm Mk.I/N Twin Gun Mount Kai	38.1cm Mk.I Twin Gun Mount	48	Yes	N/A	Good gun for FBB with medium stats
9	16inch Mk.I Triple Gun Mount Kai + FCR Type 284	16inch Mk.I Triple Gun Mount + AFCT Kai	68	Yes	N/A	Good gun for BB(V) with high Acc, and used is an AACI
7	46cm Triple Gun Mount Kai	46cm Triple Gun Mount	69	Yes	B182	Very niche, with long range, good FP and Acc, best gun for the Yamato-class
10	51cm Twin Gun Mount	Prototype 51cm Twin Gun Mount	85	Yes	N/A	Very niche, mostly used for its great FP
5	16inch Triple Gun Mount Mk.7 + GFCS	16inch Triple Gun Mount Mk.7	100	Yes	N/A	Great gun for (F)BB(V) with high Acc
7	8cm High-angle Gun Kai + Additional Machine Guns	8cm High-angle Gun	49	Yes	B96, B167, B169	Used for RE usage only, to maintain Artillery Spotting on some ships
9	Type C Kouhyouteki	Type A Kouhyouteki	28	No	B167	A better Minisub at +14 torpedo stat
5	Type 13 Air Radar Kai (Late Model)	Type 13 Air Radar Kai	55	Yes	N/A	A dual-purpose radar, with good bonuses and usable in the RE of some IJN ships
6	15m Duplex Rangefinder Kai + Type 21 Radar Kai 2 + Skilled Fire Direction Center	15m Duplex Rangefinder + Type 21 Radar Kai 2	80	Yes	N/A	A dual-purpose radar providing LoS, Acc, and AA, great for all (F)BB(V), especially the Yamato-class The base Duplex is also useful in the making
10	SK + SG Radar	SK Radar	94	Yes	N/A	A dual-purpose radar, with only LoS as a good stat
9	Type 32 Surface Radar Kai	Type 32 Surface Radar	58	Yes	N/A	Best large surface radar, providing LoS and Acc
6	Type 4 Passive Sonar	Type 93 Passive Sonar	29	Yes	B74	Good sonar at +12 ASW, helping to reach some OASW
5	Type144/147 ASDIC	Type124 ASDIC	57	No	Janus Kai	Good sonar at +13 ASW, helping to reach some OASW
10	Type 3 Shell Kai	Type 3 Shell	60	Yes	N/A	Only gives marginal stat boost and fit bonuses
7	QF 2-pounder Octuple Pom-pom Gun Mount	Bi Type 40mm Twin Autocannon Mount	19	Yes	Ark Royal Kai, Warspite Kai	Great AA gun useful in AACI, very cheap
6	Zuiun Model 12 (634 Air Group)	Zuiun Model 12	69	Yes	N/A	Good SPB with AAR, providing LoS, bombing, and other stats, further upgradeable and consumed to improve later variants
4	Zuiun (634 Air Group/Skilled)	Zuiun Model 12 (634 Air Group)	56	Yes	F58	Great SPB with AAR, providing LoS, bombing, and other stats, further upgradeable
3	Zuiun Kai 2 (634 Air Group)	Zuiun (634 Air Group/Skilled)	86	Yes	B132	Great SPB with AAR, providing LoS, bombing, and other stats, further upgradeable
1	Prototype Night Zuiun (Attack Equipment)	Zuiun Kai 2 (634 Air Group)	110	Yes	N/A	Best SPB, with a special Night Cut-In
10	S-51J Kai	S-51J	96	Yes	N/A	Best ASW aircraft, but extremely niche, serving for some OASW
6	Type 4 20cm Anti-ground Rocket Launcher (Concentrated Deployment)	Shipborne Model Type 4 20cm Anti-ground Rocket Launcher	53	No	N/A	Good for Anti-Installation only, giving some side bonuses, and equipable on more ships than "landing equipment"
4	Ryuusei Kai (Skilled)	Ryuusei Kai	47	Yes	N/A	Great torpedo bomber with AAR

Improvement Advice

Here is a list of improvements that have as a main goal to "enhance" said equipment's stats.

• In some cases, the equipment can be upgraded, but the upgrade is inferior to the improved base equipment,
• In some cases, the improved equipment only shows its best potential on certain ships, thanks to Visible Fit Bonuses,
• Some of the listed equipment below are obtained from above listed upgrades,
• Equipment being improved only for upgrade purposes are not listed there,
• The improvements related to Quests are not listed there, and should be done with the quests in mind.

Improvement Advice

Priority Level	Equipment	Base Screw Cost	Notes
1	Combat Ration	0	Only used to farm screws with Fd6
1	Shiden Kai 4	4	+12 airpower fighter, great to reach air superiority
3	F6F-5	6	+12 airpower fighter, great to reach air superiority
7	Type 0 Fighter Model 64 (Air Superiority Fighter Specification)	5	+11 airpower fighter, great to reach air superiority
5	Type 0 Fighter Model 64 (Skilled Fighter-bomber)	6	Good all round fighter-bomber with AAR
10	Type 0 Fighter Model 64 (Two-seat w/ KMX)	5	Very niche fighter-bomber with ASW
9	Type 99 Dive Bomber Model 22 (Skilled)	3	Medium Anti-Installation dive-bomber
10	Swordfish Mk.II (Skilled)	3	Torpedo bomber with bonuses in some "European Events"
9	TBF	3	Torpedo bomber with bonuses in some "European Events"
10	Type 2 Reconnaissance Aircraft	3	Ultra niche role as a Range extender
3	Ki-96	4	Great interceptor in all cases
5	Type 1 Fighter Hayabusa Model III A	4	Good interceptor and a decent LB fighter
2	Spitfire Mk.V	3	Great interceptor and a decent LB fighter, with bonuses in some "European Events"
10	Bomb-carrying Type 1 Fighter Hayabusa Model III Kai (65th Squadron)	4	Best LBB, but against DD only
4	Type 1 Land-based Attack Aircraft Model 34	5	Great LBB, with high stats and good range
9	Type 1 Land-based Attack Aircraft (Hachiman Force)	3	Good LBB, with good stats and good range, cheap
5	Type 1 Land-based Attack Aircraft (Nonaka Squadron)	5	Great LBB with AAR, high stats and good range
10	12cm Single Gun Mount Kai 2	2	A good very niche small gun, cheap
8	12.7cm Twin Gun Mount Model A Kai 2	2	A good small gun with great bonuses on some IJN ships, further upgradable, cheap
5	Prototype Long-barrel 12.7cm Twin Gun Mount Model A Kai 4	3	A good very niche small gun, with great bonuses on some IJN ships
4	12.7cm Twin Gun Mount Model A Kai 3 (Wartime Modification) + Anti-Aircraft Fire Director	4	A great niche small gun for AACI, with great bonuses on some IJN ships
9	12.7cm Single High-angle Gun Mount (Late Model)	2	Only one, very niche use as an Acc boost on Yura
6	12.7cm Twin Gun Mount Model C Kai 2	2	A good small gun, with great bonuses on some IJN ships
3	12.7cm Twin Gun Mount Model C Kai 3	5	A good small gun, with great bonuses on some IJN ships
1	12.7cm Twin Gun Mount Model D Kai 2	5	Best DD gun, with special bonuses for Night Cut-Ins
9	130mm B-13 Twin Gun Mount	5	A good niche small gun with FP
6	5inch Single Gun Mount Mk.30 Kai	7	A good small gun for AACI, required in some, further upgradeable
3	12.7cm Twin Gun Mount Model B Kai 4 (Wartime Modification) + Anti-Aircraft Fire Director	6	A great small gun for AACI, with great bonuses on some IJN ships
1	10cm Twin High-angle Gun Mount + Anti-Aircraft Fire Director	3	2nd best AACI small gun, great on all DD as a default gun choice No more than 10 are needed
4	14cm Twin Gun Mount Kai	3	Great medium gun on some IJN ships with fit bonuses Rarely more than 4 are needed
6	Bofors 15.2cm Twin Gun Mount Model 1930	3	Good CL gun, with good FP and great Acc
5	15.2cm Twin Gun Mount Kai	2	Great CL gun, with good FP and great Acc
1	15.2cm Twin Gun Mount Kai 2	3	The Best CL gun, with good FP and great Acc
8	15.5cm Triple Gun Mount Kai	4	Good CL gun with higher FP
2	20.3cm (No.2) Twin Gun Mount	2	Great CA gun with high FP and Acc
1	20.3cm (No.3) Twin Gun Mount	2	Great CA gun with high FP and Acc
6	8inch Triple Gun Mount Mk.9	2	2nd best cruiser gun for FP, useful on CA in Main Combined Fleets
4	8inch Triple Gun Mount Mk.9 mod.2	3	Best cruiser gun for FP, useful on CA in Main Combined Fleets
7	16inch Triple Gun Mount Mk.6 mod.2	4	Good gun for BB(V) with medium stats
4	16inch Triple Gun Mount Mk.7 + GFCS	8	Great gun for (F)BB(V) with high Acc
9	16inch Mk.VIII Twin Gun Mount Kai	5	Good gun for BB(V) with medium stats
8	16inch Mk.I Triple Gun Mount Kai + FCR Type 284	5	Good gun for BB(V) with high Acc, and used is an AACI
10	30.5cm Triple Gun Mount Kai	4	Good gun for Gangut only
9	38.1cm Mk.I/N Twin Gun Mount Kai	3	Good gun for BB(V) with high Acc, and used is an AACI
10	38cm Twin Gun Mount Kai	3	Medium gun for FBB with medium stats
4	35.6cm Triple Gun Mount Kai (Dazzle Camouflage)	4	Great gun for FBB, with good stats, especially Acc
4	35.6cm Twin Gun Mount Kai 3 (Dazzle Camouflage)	6	Great gun for FBB, with good stats, especially Acc
2	38cm Quadruple Gun Mount Kai	7	Great gun for all (F)BB(V), especially FBB, with great stats, especially Acc
4	41cm Triple Gun Mount Kai 2	7	A great gun for BB(V), especially IJN ones
4	41cm Triple Gun Mount Kai 2	7	A great gun for BB(V), especially IJN ones
5	46cm Triple Gun Mount Kai	7	Very niche, with long range, good FP and Acc, best gun for the Yamato-class
8	51cm Twin Gun Mount	7	Very niche, mostly used for its great FP
4	8cm High-angle Gun Kai + Additional Machine Guns	4	Used for RE usage only, to maintain Artillery Spotting on some ships
8	90mm Single High-angle Gun Mount	1	Good for AACI, very cheap
9	10cm Twin High-angle Gun Mount Kai + Additional Machine Guns	4	Used for RE usage only, to maintain Artillery Spotting on some ships
5	10cm Twin High-angle Gun Mount Battery Concentrated Deployment	5	Best secondary gun for AACI
8	15.2cm Triple Gun Mount	6	OK secondary with bonuses on French ships
5	15.5cm Triple Secondary Gun Mount Kai	4	Good surface secondary gun, especially for CLT or in cases of air parity or worse
2	OTO 152mm Triple Rapid Fire Gun Mount	2	2nd best surface secondary gun, especially for CLT or in cases of air parity or worse
7	53cm Twin Torpedo Mount	1	Only one, very niche, cheap
5	533mm Quintuple Torpedo Mount (Initial Model)	3	Only good for USN ships
4	61cm Triple (Oxygen) Torpedo Mount Late Model	3	Best torpedo for some IJN ships
3	61cm Quadruple (Oxygen) Torpedo Mount	1	Only one, very cheap
1	61cm Quadruple (Oxygen) Torpedo Mount Late Model	3	Best torpedo in most situation, especially on some IJN ships
2	61cm Quintuple (Oxygen) Torpedo Mount	3	Great torpedo for most ships
2	61cm Quintuple (Oxygen) Torpedo Mount	5	Great torpedo for most ships
7	Type 13 Air Radar Kai (Late Model)	3	A dual-purpose radar, with good bonuses and usable in the RE of some IJN ships
8	SG Radar (Initial Model)	6	Best small dual-purpose radar, should become upgradable in the future, very expensive
8	Type 21 Air Radar Kai 2	5	Great dual-purpose radar for some ships
10	SK + SG Radar	6	A dual-purpose radar, with only LoS as a good stat
6	Type 32 Surface Radar Kai	5	Best large surface radar, providing LoS and Acc
5	Type 3 Active Sonar	2	Good for ASW, cheap
3	Type 3 Active Sonar Kai	4	Good for ASW, with some bonuses on IJN ships
3	Type 4 Passive Sonar	3	Good for ASW, cheap
10	Type 0 Passive Sonar	3	Unusable on most ASW ships, gives bonuses on some ships
4	Type 2 Depth Charge	2	Good for ASW, with AP, cheap
6	Type 3 Depth Charge Projector	2	Good for ASW, cheap
8	Type 3 Depth Charge Projector (Concentrated Deployment)	3	Good for ASW
3	Type 2 Depth Charge Kai 2	3	Good for ASW, with AP
2	Type 91 Armor Piercing Shell	1	Good to improve some Artillery Spotting, cheap, further upgradeable
1	Type 1 Armor Piercing Shell	1	Good to improve some Artillery Spotting, further upgradeable
10	Type 1 Armor Piercing Shell Kai	7	Good to improve some Artillery Spotting
1	Type 3 Shell	4	Only gives marginal stat boost, further upgradeable
2	Type 3 Shell Kai	6	Only gives marginal stat boost and fit bonuses with improvement
4	Type 3 Shell Kai 2	6	Only gives marginal stat boost and fit bonuses with improvement
4	2cm Flakvierling 38	3	Has great fit bonuses, can be used in some AACI
1	12cm 30-tube Rocket Launcher Kai 2	4	Needed to trigger the "AARB" that negates some plane damages, can be used in some AACI
5	25mm Triple Autocannon Mount (Concentrated Deployment)	3	Good AA gun for AACI
2	Type 94 Anti-Aircraft Fire Director	2	Great to provide Acc via RE on most ships, also used for some AACI
10	New Model High Temperature High Pressure Boiler	8	Good at +7 only, to gain Speed bonuses, but cheaper elsewhere
5	New Kanhon Design Anti-torpedo Bulge (Medium)	6	Good to provide armor
10	Pugliese Underwater Protection Bulkhead	4	Can provide armor on some Italian ships
5	New Kanhon Design Anti-torpedo Bulge (Large)	6	Good to provide armor
2	Searchlight	2	Only one, for some Night Battle cases
10	Type 96 150cm Searchlight	3	Only one, mostly inferior to the base one
10	Swordfish Mk.II Kai (Reconnaissance Seaplane Model)	3	Good on some European ships
3	Type 0 Observation Seaplane	2	Good on most ships, cheap
3	Type 0 Reconnaissance Seaplane Model 11B	4	Great recon for all ships
9	Fairey Seafox Kai	4	Good on some European ships
3	Shiun	4	Best LoS recon
5	Ro.44 Seaplane Fighter bis	4	good to maintain airpower without carriers
2	Type 2 Seaplane Fighter Kai (Skilled)	7	Great to maintain airpower without carriers
2	Kyoufuu Kai	4	Great to maintain airpower without carriers
2	Kyoufuu Kai 2	7	Great to maintain airpower without carriers, best SPF
10	Laté 298B	3	Niche French SPB
5	Zuiun (634 Air Group/Skilled)	6	Great SPB with AAR, providing LoS, bombing, and other stats, further upgradeable
3	Zuiun Kai 2 (634 Air Group)	8	Great SPB with AAR, providing LoS, bombing, and other stats, further upgradeable
10	S-51J Kai	8	Best ASW aircraft, but extremely niche, serving for some OASW
11	Type 3 Command Liaison Aircraft Kai	3	Good ASW, but almost useless
1	Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)	2	Great against Installations in all cases
1	Special Type 2 Amphibious Tank	2	Great against Installations in all cases, and can serve for resource farming
6	Toku Daihatsu Landing Craft	2	Good for Expeditions, increasing the gains
3	Soukoutei (Armored Boat Class)	2	Great against Installations and PT Imps
3	Armed Daihatsu	3	Great against Installations and PT Imps
5	Skilled Deck Personnel + Aviation Maintenance Hands	2	For CV(B/L) RE usage only to improve combat effectiveness

Improvement Traps

Here is a list of equipment that should NOT be upgraded, as they are needed to upgrade better equipment, and thus upgrading them renders them less valuable.

• Additionaly, so far, Submarine Equipment do not gain any stat from improvement.