Japan - Air RB - Performance Guide 2025

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Japan - Air RB - Performance Guide 2025:

Japan - Air RB - Performance Guide 2025:

A6M2, A6M2 mod. 11: These planes benefit from MEC over AEC with better radiator management and Infi-WEP. These planes do not gain additional cooling from high speed, they actually get slightly warmer at high-speed including dives.Time wear: (-0/-1°C) / 10min and then (-0/-18°C) @ 16min for a total of (-0/-19°C) @ 16min. Fuel: 30min. Engine hp drop: 3900m.

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat = (1:30min)
*Orange overheat = (3min).

*MEC chart settings allow Infi-WEP.

*Prop97 keeps engine much cooler, allows for Infi-WEP and has same performance as Prop100 under 3900m. Prop97 can be used to 3900m Then Prop100 should be used.

Details:
A6M2:
AEC:415/434, MEC:414/431, 0Rad:441
*** Infi -WEP settings (Up to 3900m Then Prop100 should be used.): ***
Prop97 with Rad18/18 @ 1000m = 419/436WEP kph (Cold)
Prop97 with Rad32/32 @ 1000m = 414/431WEP kph (Mod)
Prop97 with Rad38/38 @ 1000m = 412/429WEP kph. (Hot)

A6M2 mod. 11:
AEC:420/440, MEC:418/436, 0Rad:449
*** Infi -WEP settings (Up to 3900m Then Prop100 should be used.): ***
Prop97 with Rad18/18 @ 1000m = 424/442WEP kph (Cold)
Prop97 with Rad32/32 @ 1000m = 418/436WEP kph (Mod)
Prop97 with Rad38/38 @ 1000m = 416/433WEP kph. (Hot)

A6M3, A6M3 mod.22, A6M3 mod. 22Ko: These planes benefit from MEC over AEC overall. These planes do not gain additional cooling from high speed, they actually get slightly warmer at high-speed including dives. [/u] Time wear: (-1/-1°C) / 4min and then (-9/-9°C) @ 16min for a total of (-10/-10°C) @ 16min. Fuel: 30min.

A6M3 : Engine hp drop: 5600m.
A6M3 mod.22, A6M3 mod. 22Ko: Engine hp drop: 5500m.

*Engine off with (45sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat = (4-5min)
*Orange overheat = (3min).

*MEC chart settings allow Infi-WEP

*Supercharger gear shifts and hp drop are the same for Prop100 and Prop92.

*Prop92 keeps engine much cooler, allowing for Infi-WEP, increases top speed approx (+1/+2kph) and adds approx (+0.2/+0sec) per 1000m climb. [u]Prop92 can be used to 7000m Then Prop100 should be used.

Details:
A6M3:
AEC:449/463, MEC:449/467, 0Rad:470
*** Infi -WEP settings (Up to 7000m Then Prop100 should be used.): ***
Prop92 with Rad6/6 @ 1000m = 451/469WEP kph (Cold)
Prop92 with Rad12/12 @ 1000m = 449/467WEP kph (Mod)
Prop92 with Rad16/16 @ 1000m = 448/466WEP kph (Hot)

A6M3 mod.22, A6M3 mod. 22Ko:
AEC:450/464, MEC:450/468, 0Rad:472
*** Infi -WEP settings (Up to 7000m Then Prop100 should be used.): ***
Prop92 with Rad6/6 @ 1000m = 452/470WEP kph (Cold)
Prop92 with Rad12/12 @ 1000m = 450/468WEP kph (Mod)
Prop92 with Rad16/16 @ 1000m = 449/467WEP kph (Hot)

A6M5, A6M5 otsu, A6M5 Hei:
These planes benefit from MEC over AEC overall. These planes do not gain additional cooling from high speed, they actually get slightly warmer at high-speed including dives. Prop94 keeps engine cooler allowing for Infi-WEP, adds approx (+0.7/+0sec) per 1000m climb Prop94 can be used to 5500m Then Prop100 should be used. Time wear: (-1/-0°C) / 5min. Fuel: 30min. Engine hp drop: 5500m.

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat = (5min). (2:30min) after engine on/off power cycle. (1min) if stacked.
*Orange overheat = (3min).

*MEC chart settings allow Infi-WEP.

*Supercharger gear shifts and hp drop are the same for Prop100 and Prop94.

Details:
A6M5:
AEC:466/478, MEC:462/481, 0Rad:490
*** Infi -WEP settings ( Up to 5500m Then Prop100 should be used. ): ***
Prop94 with Rad9/9 @ 1000m = 467/485WEP kph (Cold)
Prop94 with Rad18/18 @ 1000m = 462/481WEP kph (Mod)
Prop94 with Rad22/22 @ 1000m = 460/479WEP kph (Hot)

A6M5 Ko, A6M5 otsu:
AEC:465/477, MEC:460/479, 0Rad:488
*** Infi -WEP settings ( Up to 5500m Then Prop100 should be used. ): ***
Prop94 with Rad9/9 @ 1000m = 464/483WEP kph (Cold)
Prop94 with Rad18/18 @ 1000m = 460/479 WEP kph (Mod)
Prop94 with Rad22/22 @ 1000m = 458/478WEP kph (Hot)

A6M5 Hei:
AEC:455/467, MEC:450/470, 0Rad:478
*** Infi -WEP settings ( Up to 5500m Then Prop100 should be used. ): ***
Prop94 with Rad9/9 @ 1000m = 453/475WEP kph (Cold)
Prop94 with Rad18/18 @ 1000m = 450/470 WEP kph (Mod)
Prop94 with Rad22/22 @ 1000m = 447/468WEP kph (Hot)

A7M2: This plane benefits from MEC over AEC overall. This plane does not gain additional cooling from high speed, it actually gets slightly warmer at high-speed including dives. Time wear: (-6/-17°C) @ 16min. Fuel: 30min. Engine hp drop: 5300m.

*MEC chart settings allow Infi-WEP

Details:
AEC:517/534, MEC:517/530, 0Rad:542
*** Infi -WEP settings***
Prop100 with Rad12/12 @ 1000m = 522/535WEP kph (Cold)
Prop100 with Rad26/20 @ 1000m = 517/530WEP kph (Mod)
Prop100 with Rad32/22 @ 1000m = 514/526WEP kph (Hot)

N1K1-Ja: This plane benefits from MEC over AEC with better cooling. AEC mismanages the radiator letting plane needlessly letting it overheat when using WEP. This plane does not gain additional cooling from high speed, airspeed makes little to no difference in cooling. This plane can Infi -WEP with little to no performance loss. Time wear: (-1/-1°C) / 7min and then (-18/-9°C) @ 16min for a total of (-19/-19°C) @ 16min. Fuel: 30min. Engine hp drop:6400m.

*MEC chart settings allow Infi-WEP

Details:
AEC:486/508, MEC:487/507, 0Rad:512
*** Infi -WEP settings***
Prop100 with Rad16/16 @ 1000m = 490/510WEP kph (Cold)
Prop100 with Rad26/26 @ 1000m = 487/507WEP kph (Mod)
Prop100 with Rad26/26 @ 1000m = 487/507WEP kph (Hot)

Supplemental Notes:
*Prop97 can be used with chart settings for same climb rate and (+2/+2kph) to top speed. Can be used up to 6400m, then Prop100 should be used.

N1K2-J, N1K2-Ja: These planes benefit from MEC over AEC overall. This plane does not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Time wear: (-5/-0°C) @ 16min. Fuel:30min. Engine hp drop: 5900m

*MEC chart settings allow Infi-WEP

Details:
AEC:513/538, MEC:514/535, 0Rad:549
*** Infi -WEP settings: ***
Prop100 with Rad16/16 @ 1000m = 521/541WEP kph (Cold)
Prop100 with Rad34/24 @ 1000m = 514/535WEP kph (Mod)
Prop100 with Rad44/24 @ 1000m = 511/532WEP kph (Hot)

Supplemental Notes:
*Prop97 can be used with chart settings for same climb rate and (+2/+2kph) to top speed. Can be used up to 5900m, then Prop100 should be used.

J2M2, J2M3, J2M4 Kai, J2M5: These planes benefit from MEC over AEC with better cooling. This plane does not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Engine gets slightly warmer at higher speeds. Time wear: (-3/-4°C) @ 16min. Fuel: 30min

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat = (5min). (1min) if stacked.
*Orange overheat = (3min).

*MEC chart settings allow Infi-WEP

Details:
J2M2:
Engine hp drop: 5100m.
AEC:507/536, MEC:503/531, 0Rad:539
*** Infi -WEP settings: ***
Prop100 with Rad4/20 @ 1000m = 506/535WEP kph (Cold)
Prop100 with Rad12/32 @ 1000m = 503/531WEP kph (Mod)
Prop100 with Rad16/36 @ 1000m = 501/529WEP kph (Hot)

J2M3:
Engine hp drop: 5100m.
AEC:505/533, MEC:501/530, 0Rad:535
*** Infi -WEP settings: ***
Prop100 with Rad4/20 @ 1000m = 504/532WEP kph (Cold)
Prop100 with Rad12/32 @ 1000m = 501/530WEP kph (Mod)
Prop100 with Rad16/36 @ 1000m = 500/529WEP kph (Hot)

J2M4 Kai:
Engine hp drop: 6300m
AEC:508/538, MEC:502/532, 0Rad:541
*** Infi -WEP settings: ***
Prop100 with Rad8/24 @ 1000m = 506/535WEP kph (Cold)
Prop100 with Rad20/40 @ 1000m = 502/532WEP kph (Mod)
Prop100 with Rad24/44 @ 1000m = 499/530WEP kph (Hot)

J2M5:
Engine hp drop: 6400m
AEC:506/539, MEC:501/535, 0Rad:542
*** Infi -WEP settings: ***
Prop100 with Rad8/24 @ 1000m = 504/537WEP kph (Cold)
Prop100 with Rad20/40 @ 1000m = 501/535WEP kph (Mod)
Prop100 with Rad24/44 @ 1000m = 500/534WEP kph (Hot)

Supplemental Notes:
*Lowering Prop pitch (even Prop97) had negative effect on climb rate.
*Sudden stall characteristic.

J7W1: This plane benefits from MEC over AEC with better cooling. This plane does not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Engine gets slightly warmer at higher speeds. Time wear: (-4/-10°C) @ 16min. Fuel: 30min. Engine hp drop: 8800m.

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat = (3-5min).
*Orange overheat = (3min).

*MEC chart values will generally not exceed yellow overheat when using WEP.

Details:
AEC:574/605, MEC:574/605, 0Rad:616
Prop94 with Rad-/12 @ 1000m = 579/611WEP kph (Cold)
Prop94 with Rad-/24 @ 1000m = 574/605WEP kph (Mod)
Prop94 with Rad-/36 @ 1000m = 569/600WEP kph (Hot)

Supplemental Notes:
*Sudden and severe stall characteristic.
*Pitches up with Auto trim on

Ki-43-II: This plane benefits from MEC over AEC with better cooling allowing for Infi-WEP. Engine gets slightly warmer at higher speeds. Time wear: (-4/-0°C) @ 16min. Fuel: 30min Engine hp drop: 5900m.

*Engine off with (15sec) in white, then back on, usually resolves (All) overheat wear.
*Orange overheat = (3min).

*MEC chart settings allow Infi-WEP

Details:
*** Infi -WEP settings: ***
AEC:427/435, MEC:419/432, 0Rad:443
Prop100 with Rad16/16 @ 1000m = 423/436WEP kph (Cold)
Prop100 with Rad32/32 @ 1000m = 419/432WEP kph (Mod)
Prop100 with Rad36/36 @ 1000m = 416/430WEP kph (Hot)

Ki-43-III otsu : This plane benefits from MEC over AEC with better cooling. This plane does not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Engine gets slightly warmer at higher speeds. Time wear: (-12/-19°C) @ 16min. Fuel: 30min Engine hp drop: 5800m.

*Engine off with (45sec) in white, then back on, usually resolves (Per color) overheat wear.
*Orange overheat = (3min).

*MEC chart settings will generally not exceed orange overheat when using WEP.

Details:
AEC:461/485, MEC:466/491, 0Rad:495
Prop100 with Rad16/16 @ 1000m = 467/492WEP kph (Cold)
Prop100 with Rad20/20 @ 1000m = 466/491WEP kph (Mod)
Prop100 with Rad24/24 @ 1000m = 465/490WEP kph (Hot)

*** Infi -WEP settings (Up to 5800m Then Prop100 should be used.): ***
Prop97 with Rad34/54 @ 1000m = 461/485WEP kph (Cold)

Ki-44-I, Ki-44-I 34: This plane benefits from MEC over AEC with better cooling. AEC does not open radiator enough causing the plane to overheat. This plane does not gain additional cooling from high speed. Engine gets slightly warmer at higher speeds. Time wear: (-4/-2°C) / 16min. Fuel: 30min Engine hp drop: 2900m.

*Mixture should be set to (Mix80) at all alts for max hp to engine.

*Engine off with (30sec) in white, then back on, heals/recovers (Per color) overheat wear.
*Yellow overheat = (10min). (2:30min) after engine on/off power cycle. (1min) if stacked.
*Orange overheat = (3min).

*MEC chart settings will generally not exceed yellow overheat when using WEP.

Details:
AEC:493/502, MEC:486/497, 0Rad:509
Prop100 with Rad16/16 @ 1000m = 492/502WEP kph (Cold)
Prop100 with Rad32/32 @ 1000m = 486/497WEP kph (Mod)
Prop100 with Rad36/36 @ 1000m = 484/495WEP kph (Hot)

Ki-44-II hei : This plane benefits from MEC over AEC with better cooling. This plane does not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Prop97 keeps engine much cooler, has same performance as Prop100 under 4600m. Prop97 can be used to 4600m Then Prop100 should be used. Engine gets slightly warmer at higher speeds. Time wear: (-4/-8°C) @ 16min. Fuel: 30min. Engine hp drop: 4600m.

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Orange overheat = (3min).

*MEC chart settings will generally not exceed orange overheat when using WEP.

Details:
AEC:502/535, MEC:508/532, 0Rad:547
Prop97 with Rad24/24 @ 1000m = 514/537WEP kph (Cold)
Prop97 with Rad36/36 @ 1000m = 508/532WEP kph (Mod)
Prop97 with Rad48/48 @ 1000m = 505/528WEP kph (Hot)

Supplemental Notes:
*Prop100 Supercharger gear shifts: (2nd gear: 2800/2300)

Ki-61-I ko, Ki-61-I otsu , Ki-61-I hei , Ki-61-I tei : These planes benefit from MEC over AEC with better cooling and performance. AEC mismanages the radiator causing a significant loss of top speed using WEP and overheating the engine (red) within 30-60sec. AEC also does not open the radiator enough on hot maps causing the engine to needlessly overheat. These planes do not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Engine gets slightly warmer at higher speeds. Max rpm/over rev warning will appear at approx 600kph in dives. Adjusting throttle to approx 70% or lower avoids overheat/overrev in dives when over 600kph. Time wear: (-1/-1°C) @ 8min. Engine hp drop: 4500m.

*Ki-61-I ko: Fuel: 36min
*Ki-61-I otsu , Ki-61-I hei , Ki-61-I tei: Fuel: 30min

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat = (10min). (5min) after engine on/off power cycle. (1min) if stacked.
*Orange overheat = (3min).

*Engine temps over 108/113°C should be avoided as a priority. Engine temps over 108/113°C will cause temperature threshold to drop within 30-60sec from orange to red.

*Prop92 can be used with chart Rad settings for yellow Infi-WEP, with approx top speed (-2/-1kph), adds approx (+1/+0.4sec) per 1000m climb [u]Prop92 can be used to 4500m Then Prop100 should be used. This option allows for Yellow Infi-WEP for up to 10min without reaching 108/113°C.

Details:
Ki-61-I ko, Ki-61-I otsu:
AEC:489/494, MEC:484/503, 0Rad:510
Prop100 with Rad0/12 @ 1000m = 486/506WEP kph (Cold) (Yellow Infi-WEP)
Prop100 with Rad0/24 @ 1000m = 484/503WEP kph (Mod)
Prop100 with Rad0/36 @ 1000m = 481/501WEP kph (Hot)

***Infi-WEP settings (Up to 4500m Then Prop100 should be used.): ***
Prop92 with Rad0/12 @ 1000m = 484/505WEP kph (Cold) (up to 4500m) (Infi-WEP)
Prop92 with Rad0/24 @ 1000m = 482/502WEP kph (Mod) (up to 4500m) (Yellow Infi-WEP)
Prop92 with Rad0/36 @ 1000m = 479/500WEP kph (Hot) (up to 4500m) (Yellow Infi-WEP)

Ki-61-I hei:
Same MEC options detailed above, as Ki-61-I ko, Ki-61-I otsu, except (-3/-3kph) to top speeds and Prop92 adds approx (+1/+0.25sec) per 1000m climb.

Ki-61-I tei:
Same MEC options detailed above, as Ki-61-I ko, Ki-61-I otsu, except (-5/-5kph) to top speeds and Prop92 adds approx (+1.4/+1sec) per 1000m climb.

Ki-61-II Kai: This plane benefits from MEC over AEC with better radiator management. This planes do not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Engine gets slightly warmer at higher speeds. Time wear: (-3/-2°C) / 16min. Fuel: 30min. Engine hp drop: 5900m.

*Engine off with (60sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat = (5min). (3min) after engine on/off power cycle. (1:30min) if stacked.
*Orange overheat = (3min).

*MEC chart settings will generally not exceed yellow overheat when using WEP.

*This plane does not suffer from overrevving like the other Ki-61 versions

*Prop94 can be used, with approx top speed (+1/+1kph), and approx (+0.15/-0.15sec) per 1000m climb [u]Prop94 can be used to 5900m Then Prop100 should be used.

Details:
AEC:508/530, MEC:510/529, 0Rad:537
Prop94 with Rad0/20 @ 1000m = 515/532WEP kph (Cold) (up to 5900m) (Infi-WEP)
Prop94 with Rad6/30 @ 1000m = 510/529WEP kph (Mod) (up to 5900m) (Yellow Infi-WEP)
Prop94 with Rad12/50 @ 1000m = 504/522WEP kph (Hot) (up to 5900m) (Yellow Infi-WEP)

Supplemental Notes:
*MEC settings account for Time wear, which is why Rad settings are slightly conservative.
*Overheat does not exceed 98°C for oil.

Ki-100: This plane benefits from MEC over AEC with better radiator management. The radiator on this plane stays completely closed with WEP which is why it is the same value as 0Rad. MEC settings allow for Infi-WEP. This plane does not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Engine gets slightly warmer at higher speeds. Time wear: None / 16min. Fuel: 30min. Engine hp drop: 5800m.

*MEC chart settings allow Infi-WEP

Details:
AEC:473/506, MEC:471/500/0Rad:506
*** Infi -WEP settings: ***
Prop100 with Rad10/20 @ 1000m = 473/502WEP kph (Cold)
Prop100 with Rad15/30 @ 1000m = 471/500WEP kph (Mod)
Prop100 with Rad20/35 @ 1000m = 569/497WEP kph (Hot)

Ki-84 ko, Ki-84 otsu, Ki-84 hei : These planes benefit from MEC over AEC overall. AEC is overly aggressive at 100% throttle and slows plane down significantly, when WEP is used AEC does not open radiator until very late. This plane does not gain additional cooling from high speed, it actually gets slightly warmer at high-speed including dives. Time wear: (-4/-13°C) @ 16min. Fuel: 30min. Engine hp drop: 5900m.

*Engine off with (60sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat=(5-4min)
*Orange overheat=(3-2min)

*MEC chart settings will generally not exceed yellow overheat when using WEP.

*Prop90 has much better cooling while maintaining same climb rate as Prop100. Prop90 has higher top speed than Prop100 approx (+4/+4kph). Prop90 can be used to 4700m Then Prop100 should be used .

Details:
AEC:541/575, MEC:552/572, 0Rad:581
Prop90 with Rad0/9 @ 1000m = 557/578WEP kph (Cold) (Yellow Infi-WEP)
Prop90 with Rad6/18 @ 1000m = 552/572WEP kph (Mod) (Yellow Infi-WEP)
Prop90 with Rad8/22 @ 1000m = 550/570WEP kph (Hot) (Yellow Infi-WEP)

*** Infi -WEP settings: ( Prop90 can be used to 4700m Then Prop100 should be used .) ***
Prop90 with Rad0/18 @ 1000m = 553/574WEP kph (Cold) (up to 4700m)
Prop90 with Rad12/36 @ 1000m = 544/564WEP kph (Mod) (up to 4700m)
Prop90 with Rad16/44 @ 1000m = 539/560WEP kph (Hot) (up to 4700m)

Supplemental Notes:
*Prop100 Supercharger gear shifts: (2nd gear: 3800/3000)

Ki-83: This plane benefits from MEC over AEC with better cooling. AEC does not open the radiator enough causing the plane to needlessly overheat. This plane does not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Time wear: (-1/-1°C) / 10min. Fuel: 34min. Engine hp drop: 9800m.

*Mixture should be lowered to (Mix30) above 8700m to extend ceiling.

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Orange overheat = (3min)

*MEC chart settings will generally not exceed orange overheat when using WEP.

Details:
AEC:545/576/MEC:552/570, 0Rad:595
Prop100 with Rad15/35 @ 1000m = 561/580WEP kph (Cold)
Prop100 with Rad35/55 @ 1000m = 552/570WEP kph (Mod)
Prop100 with Rad45/65 @ 1000m = 546/564WEP kph (Hot)

Supplemental Notes:
*Time wear: (-1/-1°C) / 10min (factored into MEC settings)

Strike & Other Aircraft:

B7A2: This plane benefits from MEC over AEC with Infi-WEP ability. This plane does not gain additional cooling from high speed, it actually gets slightly warmer at high-speed including dives. Time wear: (-0/-0°C) @ 16min. Fuel: 88min. Engine hp drop: 6000m.

*Mixture should be set to (Mix76) at all alts.

*MEC chart settings allow Infi-WEP.

Details:
AEC:476/504, MEC:475/503, 0Rad:506
***Infi-WEP settings: ***
Prop100 with Rad16/8 @ 1000m = 475/503WEP kph (Cold)
Prop100 with Rad16/8 @ 1000m = 475/503WEP kph (Mod)
Prop100 with Rad20/10 @ 1000m = 474/502WEP kph (Hot)

Supplemental Notes:
*There is no option for flight testing without bombs, therefor 800kg bombs were dropped on takeoff at 270kph, adding approx (+9/+7sec) to initial 0-1000m climb, which is included in chart climb times, compared to without bombs.

Premium Aircraft:

Ki-44-I 34: Refer to Ki-44-I, Ki-44-I 34 section earlier in guide.

B7A2 (Homare 23): This plane benefits from MEC over AEC with Infi-WEP ability. This plane does not gain additional cooling from high speed, it actually gets slightly warmer at high-speed including dives. Time wear: (-5/-4°C) @ 16min. Fuel: 60min. Engine hp drop: 5700m.

*Engine off with (15sec) in white, then back on, usually resolves (Per color) overheat wear.
*Orange overheat = (3min). (1:30min) after engine on/off power cycle.

*MEC chart settings allow Infi-WEP.

Details:
AEC:482/504, MEC:482/502, 0Rad:512
***Infi-WEP settings: ***
Prop100 with Rad15/15 @ 1000m = 485/505WEP kph (Cold)
Prop100 with Rad30/20 @ 1000m = 482/502WEP kph (Mod)
Prop100 with Rad40/20 @ 1000m = 480/500WEP kph (Hot)

Supplemental Notes:
*There is no option for flight testing without bombs, therefor 800kg bombs were dropped on takeoff at 270kph, adding approx (+6/+5sec) to initial 0-1000m climb, which is included in chart climb times, compared to without bombs.

Ki-100-II: This plane benefits from MEC over AEC with better radiator management. The radiator on this plane stays completely closed with WEP which is why it is the same value as 0Rad. MEC settings allow for Infi-WEP. This plane does not gain additional cooling from high speed, airspeed makes little to no difference in cooling. Engine gets slightly warmer at higher speeds. Time wear: None / 16min. Fuel: 30min. Engine hp drop:7600m.

*MEC chart settings allow Infi-WEP

*Prop94 can be used for extra speed (+2/+2kph) up to 7600m with same climb rate as Prop100. Prop94 can be used to 7600m Then Prop100 should be used .

Details:
AEC:473/509/MEC:470/500, 0Rad:509
*** Infi -WEP settings: ***
Prop100 with Rad10/20 @ 1000m = 474/503WEP kph (Cold)
Prop100 with Rad15/30 @ 1000m = 470/500WEP kph (Mod)
Prop100 with Rad20/35 @ 1000m = 469/497WEP kph (Hot)

Supplemental Notes:
*Prop94 at throttle100 had surges of better climb performance at some higher alts (approx 5000m) than Prop100 but this is irelevant since Infi-WEP setting is being used. Prop100 used for simplicity.

Ki-96: This plane benefits from MEC over AEC with more consistent radiator settings. This plane does not gain additional cooling from high speed, it actually gets slightly warmer at high-speed including dives. Time wear: (-4/-1°C) @ 16min. WEP: 18:00min. Fuel: 30min Engine hp drop: 5700m.

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Orange overheat = (3min)

*MEC chart settings will generally not exceed orange overheat when using WEP.

Details:
AEC:496/525, MEC:495/525, 0Rad:529
PropAuto with Rad20/15 @ 1000m = 495/525WEP kph (Cold) (Infi-WEP)
PropAuto with Rad20/15 @ 1000m = 495/525WEP kph (Mod)
PropAuto with Rad25/15 @ 1000m = 495/524WEP kph (Hot)

*** Infi -WEP settings: ***
PropAuto with Rad15/15 @ 1000m = 496/526WEP kph (Cold)
PropAuto with Rad40/25 @ 1000m = 492/521WEP kph (Mod)
PropAuto with Rad60/30 @ 1000m = 488/518WEP kph (Hot)

Supplemental Notes:
*Time wear: (-0/-1°C) / 10min (factored into MEC settings)
*Lowering prop pitch negatively affects performance in general.

A6M5 Ko: Refer to A6M5 Ko, A6M5 otsu section earlier in guide.

A6M6c: This plane benefits from MEC over AEC overall. This plane does not gain additional cooling from high speed, it actually gets slightly warmer at high-speed including dives. WEP: 7:25min. Fuel: 30min.

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat (4-5min). (2min) after engine on/off power cycle.
*Orange overheat = (3min)

*Cold maps: MEC chart settings will generally not exceed yellow overheat.
*Mod & Hot maps: MEC chart settings will generally not exceed orange overheat.

*Prop97 keeps engine cooler with same performance as Prop100.Prop97 can be used to 7000m Then Prop100 should be used. Time wear: (-1/-0°C) / 5min.

*When using yellow Infi -WEP settings, if you run out of WEP, make sure to switch back to chart radiator settings since the extra cooling will no longer be necessary. Details below.

Details:
AEC:453/460, MEC:453/474, 0Rad:475
Prop97 with Rad6/6 @ 1000m = 453/474WEP kph (Cold) (Yellow Infi-WEP)
Prop97 with Rad8/8 @ 1000m = 453/474WEP kph (Mod)
Prop97 with Rad8/8 @ 1000m = 453/474WEP kph (Hot)

*** Yellow Infi -WEP settings ( Up to 7000m Then Prop100 should be used. ): ***
Prop97 with Rad8/8 @ 1000m = 453/474WEP kph (Cold) (Yellow Infi-WEP)
Prop97 with Rad18/18 @ 1000m = 448/469 WEP kph (Mod) (Yellow Infi-WEP)
Prop97 with Rad18/18 @ 1000m = 448/469WEP kph (Hot) (Yellow Infi-WEP)

Supplemental Notes:
*WEP generates more heat than other versions of A6M5.
*Supercharger gear shifts and hp drop are the same for Prop100 and Prop97.

A7M1 (NK9H): This plane benefit from MEC over AEC overall. This plane does not gain additional cooling from high speed, it actually gets slightly warmer at high-speed including dives. Time wear: (-1/-1°C) / 7min and then (-11/-18°C) @ 16min for a total of (-12/-19°C) @ 16min. Fuel: 30min. Engine hp drop: 6400m.

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear.
*Yellow overheat = (2-3min).
*Orange overheat = (3min).

*MEC chart settings will generally not exceed orange overheat.

*Super Charger gear shifts are same altitude for Prop90 and Prop100.

*Prop90 can be used under 6400m for Infi-WEP with approx (-3/-3 kph) to top speed. Prop90 adds approx (+3.2/+2.4sec) per 1000m climb. Prop90 can be used to 6400m Then Prop100 should be used.

Details:
AEC:481/485, MEC:496/513, 0Rad:521
Prop100 with Rad8/8 @ 1000m = 499/517WEP kph (Cold)
Prop100 with Rad16/16 @ 1000m = 496/513WEP kph (Mod)
Prop100 with Rad20/20 @ 1000m = 493/511WEP kph (Hot)

*** Infi -WEP settings ( Up to 6400m Then Prop100 should be used. ): ***
Prop90 with Rad16/16 @ 1000m = 493/510WEP kph (Cold)
Prop90 with Rad32/32 @ 1000m = 485/503WEP kph (Mod)
Prop90 with Rad40/40 @ 1000m = 482/499WEP kph (Hot)

Supplemental Notes:
*Prop97 had lower temps and had same performance as Prop100 but Prop97 (up to6400m. Cooling not enough to make a difference (still runs in orange overheat). Not listed as option since redundant.

J2M4 Kai: Refer to J2M2, J2M3, J2M4 Kai, J2M5 section earlier in guide.

Ki-87: This plane benefits from MEC over AEC overall. AEC sets the Rad incorrectly causing the plane to overheat when it shouldn’t and causing lower top speed using WEP vs. Throttle100% at 1000m. This plane does not gain additional cooling from high speed, it actually gets slightly warmer at high-speed including dives. Time wear: (-5/-15°C) @ 16min. WEP: 16:00min. Fuel: 30min. Engine hp drop: 10900m

*Engine off with (30sec) in white, then back on, usually resolves (Per color) overheat wear
*Orange overheat = (3min).

*MEC chart settings will generally not exceed orange overheat.

*Prop92 has same acceleration/climb as Prop100, better top speed (+2/+3kph) and cooling. Prop92 can be used to 10000m Then Prop100 should be used.

Details:
AEC:543/541, MEC:546/565, 0Rad:572
Prop92 with Rad6/6 @ 1000m = 550/569WEP kph (Cold)
Prop92 with Rad12/12 @ 1000m = 546/565WEP kph (Mod)
Prop92 with Rad18/18 @ 1000m = 543/562WEP kph (Hot)

Supplemental Notes:
*Time wear: (-0/-2°C) / 10min (factored into MEC settings)

J6K1: This plane benefits from MEC over AEC overall. This plane does not gain additional cooling from high speed, it actually gets slightly warmer at high-speed including dives. Time wear: (-5/-4°C) @ 16min. Fuel: 30min. Engine hp drop:9900m

*Mixture should be set to (Mix64) at all alts between 0-10000m, for max hp to engine.
*Mixture should be lowered to (Mix32) above 10000m to extend ceiling.

*MEC chart settings allow Infi-WEP

*Prop94 had same performance, lower temps and slightly higher top speed (+2/+2kph) as Prop100 up to 10000m, then Prop100 should be used.

Details:
AEC:551/577, MEC:563/581, 0Rad:587
*** Infi -WEP settings***
Prop94 with Rad0/12 @ 1000m = 566/585WEP kph (Cold)
Prop94 with Rad6/18 @ 1000m = 563/581WEP kph (Mod)
Prop94 with Rad8/20 @ 1000m = 562/581WEP kph (Hot)

Supplemental Notes:
*Prop100 has same super charger gear shift alt as Prop94. Prop100 generally needs (+2/+6) to radiator settings for adequate cooling, resulting in slightly lower top speed.

1 Like

Did you make this just now or did you update something about it?

I always use your guides and i couldve sworn japan has been on it for a while…

This guide is new, as of july 6, 2025.

The old guide is a few years old. you can find it on the main page under specialized charts & archive.

2 Likes

Can I just confirm, (Im only just starting to fiddle with MEC for the first time as of reading this post)

Does “PropXX” and “RadXX” mean Prop pitch %/Radiator % in the game? so when you say Prop94 it means I want it set to 94% and 9% for both rads?

Yup :)

Prop pitch in percentage %, and radiator values are oil radiator/water radiator

1 Like

Thankyou, i really appreciate your work. I cant tell you how much your guides help me. Thankyou so much

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Your welcome :)