Aisin–Toyota 8-speed automatic transmission

Motor vehicle automatic transmission models From Wikipedia, the free encyclopedia

Aisin and Toyota offer various 8-speed automatic transmissions for use in both longitudinal[a][1] and transverse[b][2] engine vehicles, based on a common, globally patented gearset concept.[a][1][b][2]

ManufacturerToyota · Aisin AW
AlsocalledBMW/Mini GA 8F 22AW
Volvo TG-81SC/SD
GM AW F8 F45 & AF50-8
VW AQ 450
PSA EAT8
Production2006–present
Class8-speed automatic transmission
Quick facts AA 80E/F · AE 80E/F · AL 80E/FTR-80SD · TR-81SD · TR-82SD AW F8 F35 · AW F8 F45, Overview ...
AA 80E/F · AE 80E/F · AL 80E/F
TR-80SD · TR-81SD · TR-82SD
AW F8 F35 · AW F8 F45
Cutaway of an AW F8 F35
Overview
ManufacturerToyota · Aisin AW
Also calledBMW/Mini GA 8F 22AW
Volvo TG-81SC/SD
GM AW F8 F45 & AF50-8
VW AQ 450
PSA EAT8
Production2006–present
Body and chassis
Class8-speed automatic transmission
Related ZF 8HP · GM 8L · ZF 9HP
Chronology
PredecessorAWTF-80 SC transmission
Close

The Aisin TL-80SN (Toyota AA 80E/AA 80F/AA 81E) series is the world's first 8-speed automatic transmission for passenger cars.[3] It is designed for longitudinal engines[a][1] and was first used in the 2007 model year Lexus LS 460.[4]

Beginning with the AW F8 transmission Aisin and Toyota derived a transverse engine variant[b][2] by adapting this globally patented gearset concept to fit into the same space as the previous generation U6xx Lepelletier gear mechanism-based 6-speed transmissions to increase the overall ratio spread, reduce gear steps, and increase the torque capacity for transverse engine vehicles as well.[5]

The Aisin AW F8 F45 (Toyota UA 80E/UA 80F) series is the world's first 8-speed automatic transmission designed for use in transverse engine[b][2] applications.[6] It is also called EAT8 (PSA), GA 8F 22AW (BMW/Mini), TG-81SC (Volvo),[7] AF50-8 (Opel/Vauxhall),[8] AW F8 F45 (Cadillac),[9] and AQ 450 (Volkswagen Group).[10]

Toyota’s marketing name for the transmission is "Direct Shift – 8AT 8-speed automatic transmission".[11][12] In contrast to the UB 80E/F transmission, which was developed by Aisin AW for Toyota, the UA 80E/F was developed in a joint venture between Toyota and Aisin AW and rated for 380 N⋅m (280 lb⋅ft).[13] Due to its worldwide application, development was carried out in a global manner involving R&D resources in Japan and the US. The Aisin AW F8 F35 (Toyota UB 80E/F) transmissions are used for lower torque applications, such as 4-cylinder engines, and rated for 280 N⋅m (207 lb⋅ft).[13][14]

Key data

More information Toyota, FirstDeliv- ery ...
Gear Ratios[c]
Aisin Toyota First
Deliv-
ery		 Gear Total Span Avg.
Step		 Components Nomenclature
R2[d] R1 1 2 3 4 5 6 7 8 Nomi-
nal		 Effec-
tive		 Cen-
ter		 Total per
Gear[e]		 Instal-
lation		 Drive Gears
Count		 Maximum Input Torque
Longitudinal engines[a][1] 3
Gearsets
2
Brakes
4
Clutches		 1.125
TL-80SN AA 80E/F 2006 −2.176 −4.056 4.597 2.724 1.864 1.464 1.231 1.000 0.824 0.685 6.709 5.920 1.775 1.312 A[f] A[g]
B[h]		 8[e] 550 N⋅m (406 lb⋅ft)
— AB 80E/F 2015 −2.053 −3.786 4.796 2.811 1.844 1.429 1.214 1.000 0.818 0.672 7.132 5.630 1.796 1.324 550 N⋅m (406 lb⋅ft)[17]
TR-80SD AE 80E/F 2010 −2.053 −3.825 4.845 2.8404 1.864 1.4369 1.217 1.000 0.816 0.672 7.206 5.689 1.805 1.326 550 N⋅m (406 lb⋅ft)[18]
TR-81SD — 2010 −2.182 −4.066 4.970 2.8398 1.864 1.4370 1.210 1.000 0.825 0.686 7.247 5.930 1.846 1.327 600 N⋅m (443 lb⋅ft)[19]
TR-82SD — 2010 −2.182 −4.024 4.919 2.811 1.844 1.429 1.207 1.000 0.827 0.686 7.173 5.869 1.836 1.325 850 N⋅m (627 lb⋅ft)[20]
— AL 80E/F 2023 −1.870 −3.646 4.413 2.808 1.950 1.511 1.274 1.000 0.793 0.652 6.774 5.596 1.696 1.314 TBD
Transverse engines[b][2]
AW F8 F45 UA 80E/F 2016 −2.059 −4.221 5.519 3.184 2.050 1.492 1.235 1.000 0.801 0.673 8.200 6.271 1.927 1.351 U[i] A[j]
B[h]		 8[e] 380 N⋅m (280 lb⋅ft)[9][13]
AW F8 F35 UB 80E/F 2016 −2.059 −4.015 5.250 3.029 1.950 1.457 1.221 1.000 0.809 0.673 7.800 5.965 1.880 1.341 280 N⋅m (207 lb⋅ft)[13][14]
TG-80LS UB 80E/F 2017 −2.053 −4.003 5.070 2.972 1.950 1.4698 1.231 1.000 0.808 0.672 7.540 5.953 1.846 1.335 350 N⋅m (258 lb⋅ft)
TBD TBD TBD −2.182 −4.255 5.200 2.971 1.950 1.4700 1.224 1.000 0.817 0.686 7.583 6.205 1.888 1.336 TBD
  1. [a]
    See also Toyota A transmission
  2. [b]
    See also Toyota U transmission
  3. [c]
    Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage
  4. [d]
    Logically, the gearset concept (layout) provides for this 2nd reverse gear, but it will most likely not be used in the transmissions that the car manufacturers eventually bring to market. In some data sheets, the gear ratio of R2 is given, presumably a careless error[1][15][16]
  5. [e]
    Forward gears only
  6. [f]
    Longitudinal engine
  7. [g]
    Rear-wheel drive
  8. [h]
    Four-wheel drive
  9. [i]
    Transverse engine
  10. [j]
    Front-wheel drive
Close

Specifications

Combined Parallel and Serial Coupled Gearset Concept For More Gears And Improved Cost-Effectiveness

The main objective in replacing the predecessor model was to improve vehicle fuel economy with extra speeds and a wider gear span to allow the engine speed level to be lowered (downspeeding).

Smaller parts and a hydraulic circuit with fewer components allow the transmission to maintain the same size as the previous LS 430's 6-speed transmission. The aluminum die-cast case is 10% lighter, yet 30% more rigid, even with two additional gears and a 22% greater torque capacity. The new transmission weighs 95 kg (209 lb) or 10% more than the previous unit. With new micro-laser technology gear tooth production tolerances have been reduced by 50%. Aluminum has also replaced steel on gear tooth surfaces. Shift times are as low as 0.35 seconds or 41% faster than the previous LS 430's unit.

The Lexus IS F and LS 460 (with sport package) use Sport Direct Shift (SPDS) which allows for faster shift times. The torque converter can lockup from 2nd to 8th gears.

Two reverse gears

The gearset concept offers two reverse gears. Due to the increasing electronic control of automatic transmissions and engines, a fast reverse gear (i.e. designed to reduce wheel spin) is no longer necessary for problem-free starting in icy conditions (winter mode). It is therefore unlikely that car manufacturers will make use of this special option of a dedicated winter mode with an additional reverse gear R2. For this reason, the representation of R2 in the tables is shaded gray throughout. In some data sheets, the gear ratio of R2 is given, presumably a careless error.[1][15][16]

The direction is reversed in gearset 3, the outer one of the Ravigneaux gearset. In the fast reverse gear R2, this part of the Ravigneaux gearset is directly connected to the input (turbine) side. To reduce the shaft speed for an appropriate reverse gear R1, the input (turbine) is put through gearset 1 first. This reduction corresponds to the ratio of the 3rd gear. Therefore, the gear step between the two reverse gears reflects the ratio of the 3rd gear.

Drivetrain

More information Model, Final Drive ...
Drivetrain
Model Final
Drive
AA 80E 2.937
2.85
2.69
AA 80F 3.133
AW F8 F35
AW F8 F45		 4.398
AW F8 F45 3.075
3.200
AW F8 F45 2.561
Close

Gearset Concept: Quality

All 8-speed automatic transmissions from Aisin and Toyota for passenger cars are based on the same layout[a][1][b][2] in both engines orientations.[a][1][b][2] For transverse installation,[b][2] the layout of the longitudinal installation[a][1] was merely mirrored.[a][1][b][2] Gearset 1 is not an ordinary one, but a reversed one. It consists of 2 pinions that mesh with each other. One of these pinions meshes with the sun gear, the other with the ring gear. As a results, the gearset generates different ratios and the sun gear rotates in the same direction as the ring gear when the planetary gear carrier is stationary. This made it possible to manage 8 speeds with 3 gearsets. As a result, the transmission is more compact than 8-speed transmissions from competitors. This means that an 8-speed automatic transmission was also possible for transverse engines.

UA 80E/F Failures And Problems

The UA 80E/F family of 8-speed transmissions has had some issues which led to class action lawsuits, a Customer Support Program and numerous technical service bulletins. Starting in 2017, some Highlander and Sienna customers starting complaining of harsh or delayed shifting, delayed acceleration, hesitation, jerking, unintended acceleration, lurching and excessive revving before upshifting.[21][22]

Additional issues arose when 2017 and 2018 Highlander and Sienna customers experienced whining, master warning lights/check engine lights and transmission failures. This prompted Toyota to initiate a Customer Support Program (ZJC). This program covered certain 2017 and early 2018 built Highlanders and Sienna under specific VIN parameters and transmission build dates.[23] However, this issue has been problematic beyond the scope of the ZJC program. This is causing out of pocket costs for customers outside of the standard 6 yrs./60K mls. powertrain warranty.[24]

More whine or grind issues have been documented in 2021 Avalon, Camry and Highlanders equipped with the UA 80E/F transmission prompting T-SB-0008-21.[25]

In December 2024, Gears Magazine published an article which has a more in depth look at some of the UA80's shortcomings. This includes a nut which retains the races that comes loose and allows the transfer gear to move. Another common issue is fluid contamination due to clutch debris from the torque converter.[26]

Applications

Longitudinal Engines

Toyota & Lexus: AA 80E

8-speed automatic RWD transmission.

Toyota & Lexus: AA 80F

8-speed automatic AWD transmission.

Toyota & Lexus: AA 81E

Pairs with Toyota 2GR-FSE and 2GR-FKS V6 engines.

Toyota & Lexus: AE 80F

Toyota & Lexus: AL 80E

Toyota & Lexus: AL 80F

Aisin TL-80SN

Audi

  • 2010–2015 Q7 1st generation (type 4L) 3.0 L TFSI · 3.6 L FSI · 4.2 L FSI[18]
  • 2010–2015 Q7 1st generation (type 4L) 3.0 L TDi[19]
  • 2010–2015 Q7 1st generation (type 4L) 4.2 L TDi[20]

Hongqi

Porsche (TR-80SD)

  • 2010–2017 Cayenne 2nd generation (type E2 92A) 3.0 L TFSI · 3.6 L FSI · 4.2 L FSI[18]
  • 2010–2018 Cayenne 2nd generation (type E2 92A) 3.0 L TDi[19]
  • 2010–2017 Cayenne 2nd generation (type E2 92A) 4.2 TDi · 4.8 L Turbo[20]
  • 2013–2017 Panamera 1st generation (type G1 970) facelift 3.0 L TDi[20]

Volkswagen

  • 2010–2018 Touareg 2nd generation (type 7P) 3.0 L TFSI · 3.6 L FSI · 4.2 L FSI[18]
  • 2010–2018 Touareg 2nd generation (type 7P) 3.0 L TDi[19]
  • 2010–2015 Touareg 2nd generation (type 7P) 4.2 L TDi[20]

Transverse Engines

Toyota ( UA 80E/F)

[28]

Toyota ( UC 80E/F)

[29]

[30]

Lexus ( UA 80E/F)

  • 2012–present Lexus RX (V6 AL10 F-Sport, AL20 & AL30 non Hybrids)
  • 2018–present Lexus ES (non-hybrid engines)
  • 2020–2023 Lexus LM (LM350)
  • 2022–present Lexus NX (non-hybrid engines)
  • 2024–present Lexus LBX (Morizo RR)

Toyota & Lexus ( UB 80E/F)

Toyota & Lexus ( UB 81E/F)

BMW/MINI

Changan

Chery

Citroën

DS Automobiles

Exeed

Geely

GM

Jaguar

Land Rover

Lynk & Co

Mitsubishi

Opel/Vauxhall

Peugeot

Polestar

Renault

Škoda

Volkswagen/MAN

Volvo (TG-81SC/SD)

See also

Notes

  1. [a]
    See also Toyota A transmission
  2. [b]
    See also Toyota U transmission

References

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