O-I Exp’s Firepower



a redditor, HeinrichVonDoucheber caught my attention and gave me authorization to use his O-I Exp’s Firepower spreadsheet that compares this tank to other similar vehicles:

O-I Exp V 300 9.69
ARL 44 VI 300 10.69
T-150 VI 300 10.20
T29 VII 320 11.41
AMX M4 45 VII 300 9.60
T32 VIII 320 10.60
Tiger II VIII 320 10.40
VK 45.02A VIII 320 10.10
110 VIII 320 10.00

HeinrichVonDoucheber says:

So here is the table with comparison of reload time on O-I Exp and other heavies that have guns with similar average damage. Reload times were taken from wiki page, which accounts for fully trained crew, and no equipment. So O-I Exp beats all those tier VI, VII and VIII tanks except AMX M4 45, which reloads just 0.09 seconds faster.

I just don’t see what is such a gun doing in tier V. If it had horrible penetration or huge reload than you could say it’s compensated by that, but it doesn’t, it has excellent penetration for its tier and it reloads faster than 3 tiers higher tanks. It can 2 shot other heavies in its tier with AP shell, and since it has excellent penetration you don’t even have to aim at the weak spots. Tier V and VI games are infested with O-I Exp and O-I, there is not a single game without at least 1-3 of those per team.


Another spreadsheet, made by killswitch247O-I Exp’s compared to other tier V heavies:

Green= Best  Blue= Second Best

TANK HP ALPHA DPM 30 sec damage 60 sec damage PEN Accuracy Aim time Dispersion Gun depression
Kv-1s 122mm heat 660 370 1995 1110 2220 140 0,56 2,78 22/22/18
O-I exp 700 300 1935 1200 2100 130 0,39 2,49 20/20/16 10°
Bdr g1b 650 240 1580 960 1680 135 0,38 2,40 30/30/16
Kv-1 85mm 640 160 2002 1120 2080 120 0,40 2,78 25/25/16
Kv-1s 85mm 660 160 2002 1120 2080 119 0,40 2,40 22/22/13
Churchill I 700 135 1759 945 1890 145 0,35 2,21 20/20/20
Vk3001h 660 135 1689 945 1755 157 0,33 2,40 22/22/20
T1 heavy 660 115 1998 1035 2070 128 0,41 2,21 24/24/16 10°
Kv-1 57mm 640 85 2312 1190 2380 112 0,33 2,21 25/25/14

killswitch247 says:

The problem with the O-I experimental is that it’s best in class or a close second in all important stats. it isn’t weak in any way to balance out its strengths.


What you think about this vehicle and Japanese heavies in general?


I personally find that World of Tanks was a better place before the Japanese Heavies came into the scene.  For you guys, Japanese HTs are that inebriated guy who at a Gents WC will get uncomfortably close to you and then piss on your shoes. They just get on the way, push you around and most of the time are nothing but a HP to farm team slot waster with the aptitude and accuracy of a drunk men that eventually will get lucky enough to one shot kill a poor sod.  

Lately, when I wish I was playing other games and/or feelling like quitting the game for the day is when I see one of those coming around the corner.

I  also created 2 different nicknames to Japanese HTs depending how good the player driving is, “Trailer Trash” and “Mobile Japanese home”, the last kind is very rare to spot.

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O-I Exp’s Firepower

85 thoughts on “O-I Exp’s Firepower

  1. Anonymous says:

    wg just made tanks like the matilda 4 and the chi nu kai unplayable, purely UNPLAYABLE against those japanese shit tanks, matilda 4 with 102 pen on gold : ))) the OI Exp just snaphots your ass and you can’t even really hurt him with gold !

  2. Rita, why do You say that Japanese tanks are bad for game? Maybe tier 5-7 are a bit harder to deal with, but other tier jap heavies arent very good at all. And about tier 5, its total paper-tank. Ok it should have longer reload and slower speed, because no way 100 ton tank can move that fast. Tier 6 has good armor and gun, that tank can also be a bit nerfed. Tier 7 is good overall and not OP, american T29 is way better than O-Ni. Tier 8 O-Ho is not very good, that armor doesnt help much vs 200+ penetration. Previously many talked about heavies being too bad armored and weak vs gold ammo, arties and TD, and now everyone complains when meets true heavy tank. What is wrong with you all, you should complain about arty, not about slow heavy tank which can defend itself only with armor.
    Personally i have elited all jap heavies up to tier 9, will buy Typ 4 soon.

  3. Despite all this data to make the O-I exp sound op it really is not. Its large awkward design makes it a huge target for arty and gold rounds and pretty much anything else that can pen its flat 75mm armor. Playing a heavy tank I track them before they even cross the corner. Playing a td I pen them every time from where they can’t see me. Playing arty I use heat or apcr rounds no matter the distance as I know it will pen. Playing a med or light is even easier! I can flank them or simply go right beside their tank. These are the tactics employed against any casual to ‘pro’ player Jap tank.
    Eziest kill of my life.

  4. SurprisebuttSex says:

    Hmm would made it more legit if you didn’t play 1140 battles with kv1 using derp gun,but hey let’s whine about O-I exp,because it’s op as fuck.Let’s not forget the is3 so balanced tank you have 2,4 k battles in it etc etc.

  5. Anonymous says:

    yep,the game is ruined at those lower tiers with the japanese heavys.all noobs now play some OI shit tanks cause they are noobs and have big guns and godlike armor!

  6. I think its a very noob-friendly tank, like mobile arty…. a player with average skill and higher should have no trouble with it. Most trouble is same tier heavies (V)… they should just go where the O-I isnt.

  7. http://www.vbaddict.net/statistics.php?tier=5&tanktype=3&nation=0&premium=1&modeid=0&team=0&battles=1000&groupby=0&fieldname=won_lost_ratio&server=

    If you look at numbers they don’t lie. On Vbaddict data pool it is clear, among non premium T5 heavies, O-I exp. has:

    – the best winrate
    – the best accuracy
    – the best damage dealt
    – the best penetration rate
    – the best number kills per battle

    armour is quite weak instead since he got

    – the worst number of shot w/o damage per game
    – the worst damage/ratio

    By the way is also the best earner with the best net income per battle.

    Definetely OP.

    if you look at O-I, the situation is much more balanced with KV-2 and M6 to battle with as best tank. From 7 to 10 japanese tanks are good in some aspects and bad to others. Thus O-I exp. should be nerfed imho.

  8. I sold the KV-1 when I got the O-I exp.
    By the way, “experimental” is “Shisei” in Japanese.
    Shorten the “O-I Shisei”, called the “Oishi”
    “Oishii” is “Delicious” in English.
    Yeah, O-I exp is Delicious!

  9. wolvenworks says:

    my personal experience? O-I is where people started praying they have arty on their team to take the beast down.

    also, OIX has the armor of a medium tank. you can’t spit out massive damage if you’re dead (or with damaged gun, rack and gunner)

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