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The Info List - ATTESA





ATTESA (acronym for Advanced Total Traction Engineering System for All-Terrain) is a four-wheel drive system used in some automobiles produced by the Japanese automaker Nissan, including some models under its luxury marque Infiniti. The 'mechanical' ATTESA system was developed for transverse layout vehicles and introduced with the RNU12 Bluebird in the Japanese market, entering production in September 1987. The system ran right throughout the U12 series (RNU12/HNU12) and was fitted to numerous U12 models with differing engine and transmission combinations. An almost identical system is fitted to the RNN14 GTi-R Pulsar and the HNU13 Bluebird and the HNP10 Primera, finding usage in numerous other Nissan models. Quite similar to offerings from other manufacturers, drive passes from the gearbox to a center viscous limited slip differential, into a transfer case splitting drive to a co-located front differential, and tail shaft connected to the vehicle's rear differential.

Contents

1 2000+ ATTESA Update 2 ATTESA E-TS 3 ATTESA E-TS Pro 4 ATTESA E-TS (GT-R version) 5 Models and ATTESA type 6 See also 7 References 8 External links

2000+ ATTESA Update[edit] In the new system, as with a typical FWD car, the transaxle contains a differential that drives the front wheels. However, an extra shaft from this differential also drives a bevel gear housed in the transfer case that permanently turns a driveshaft for the rear wheels (i.e. there is no longer a "center" differential). Housed in the rear differential is a viscous coupling that in normal conditions is disengaged. This means that for general driving, the system is FWD only. When the computer detects slippage of the front wheels, the viscous coupling engages and transfers up to 50% of the torque to the rear wheels. This system is superior in some aspects since the standard operation is FWD there is less power lost due to friction. However, it is no longer a full-time 4WD system, and since the coupling is in the rear differential, the driveshaft itself is constantly driven even though it's not connected to anything, which saps some power and efficiency (the analogue being the front driveshaft of a part-time 4x4 truck without locking hubs) ATTESA E-TS[edit] The Electronic Torque
Torque
Split version of this all-wheel drive architecture is a more advanced system developed for Nissan
Nissan
vehicles with a longitudinal drive train layout. It was first used in August 1989 in the R32 Nissan
Nissan
Skyline GT-R and Nissan
Nissan
Skyline GTS4. Although the Skyline GT-R is exclusively AWD with manual transmission, ATTESA E-TS is also used in Nissan
Nissan
models that are available as rear wheel drive (RWD) with automatic transmissions fitted, such as the A31 Nissan
Nissan
Cefiro which was the second Nissan
Nissan
to feature the system exactly a year later in August 1990, and vehicles based on the Nissan FM platform (which are sold in certain markets under the Infiniti luxury brand). The ATTESA E-TS version uses a mostly conventional RWD transmission. Drive to the rear wheels is constant via a tailshaft and rear differential, but drive to the front wheels is more complex by utilizing a transfer case on the rear of the transmission. The drive for the front wheels comes from a transfer case bolted on the end of an almost traditional Nissan
Nissan
RWD transmission. A short driveshaft for the front wheels exits the transfer case on the right side. Inside the transfer case a multi-row chain drives a multi-plate wet clutch pack. Drive from the chain is apportioned using this clutch pack in the transfer case "differential" (the system thus does not involve a regular gear differential as in a full-time 4WD layout, but rather a center clutch), similar to the type employed in the Steyr-Daimler-Puch system in the Porsche 959. This unit is lubricated with its own dedicated NS-ATF fluid supply ( Nissan
Nissan
Special
Special
Automatic Transmission Fluid) and is not in any way connected to the fluid in the transmission. Some Nissan
Nissan
models have an external cooler with an electric pump to cool this fluid. Situated on top of the rear differential is a high pressure, low volume electric pump. This pump pressurizes Normal ATF (0-288 psi) into the transfer case to engage the clutch pack. This fluid only engages the clutch pack and does not mix with the NS-ATF lubricating the tranfercase. The higher the fluid pressure the transfer case is supplied with from the pump, the more the clutch pack engages, enabling the torque to the front wheels to be varied. Exiting the transfer case, the front drive shaft runs along the right side of the transmission, into a differential located on the right of the engines sump. This is a cast aluminum unit, with the sump and front differential made as a single unit that cannot be separated. The front right axle is shorter than the left, because the differential is closer to the right wheel. The front left axle runs through the engine's sump to the left wheel.[1] To control the ATTESA E-TS system, there is a 16-bit computer that monitors the cars movements 10 times per second to sense traction loss by measuring the speed of each wheel via the ABS sensors. Also a three-axis G-Sensor mounted underneath the center console feeds lateral and longitudinal inputs into a computer, which controls both the ATTESA-ETS AWD system and the ABS system. The computer can then direct up to 50% of the power to the front wheels. When slip is detected on one of the rear wheels (a rear wheel turn 5% or more than the front wheels), the system directs torque to the front wheels which run a non-limited slip differential. Rather than locking the AWD in all the time or having a system that is "all or nothing", the ATTESA E-TS system can apportion different torque ratios to the front wheels as it sees fit. This provides the driver with an AWD vehicle that performs like a rear wheel drive vehicle in perfect conditions and can recover control when conditions aren't as perfect. From the factory, the system is set up to provide slight oversteer in handling, and in fact the harder the car is cornered, the LESS the AWD system engages the front wheels. This promotes the oversteer rather than understeer which is apparent in most AWD/4WD vehicles. The advantage to a more traditional ATTESA (Viscous LSD) system is response in hundredths of a second. Some models fitted with the ATTESA E-TS system (such as the Nissan
Nissan
RS4 Stagea) have a "S" button on the dash. This will bypass the control system of the ATESSA E-TS computer and lock the transfer case into full 4WD. This is to be used at low speeds in snowy/icy conditions only as understeer is greatly increased in this mode. ATTESA E-TS Pro[edit] In 1995, with the introduction of the R33 Skyline GT-R, Nissan introduced a new version of their ATTESA system. It was named ATTESA-ETS Pro, as an upgrade from the earlier ATTESA-ETS. It was standard equipment in the R33 & R34 Skyline GT-R V-spec (Victory Specification) model, and was offered as an option on the standard Skyline GT-R models called the "Active LSD option". The active rear LSD was also available as an option on some rear wheel drive Nissans such as the R33 GTS25t and C34 RS Stagea. ATTESA E-TS Pro differs from the standard ATTESA E-TS in a few ways. Where ATTESA E-TS controls the front to rear torque-split, the Pro system is also capable of left-and-right torque split to the rear wheels. This is done via an active rear LSD. Additionally, ATTESA E-TS Pro was marketed as controlling the ABS system to each wheel independently, while the previous ABS computer could sense the speed of each wheel its ABS pump is only 3-channel (both rear brakes are linked as a pair). Although this is not part of the AWD system, the computer makes use of the same sensors to determine wheel slip and traction. On ATTESA E-TS Pro equipped vehicles, the front differential remains a standard differential, not being linked to the ATTESA E-TS Pro system. The R33 Skyline updated wheel speed sensors 100 times a second. The R34 Skyline updated wheel speed sensors 1000 times a second. ATTESA E-TS (GT-R version)[edit] The 2009 Nissan
Nissan
GT-R uses an updated version of the ATTESA E-TS, which is designed to work with the car's rear transaxle layout. The system is unique in the way that it utilizes two driveshafts under the vehicle's centerline, with a second driveshaft running slightly to the right of the main driveshaft which transfers power to the front wheels. Unlike the previous ATTESA systems which relied heavily on mechanical feedback, the system in the GT-R uses electronic sensors and hydraulically actuated clutches. It also has a yaw-rate feedback control system, effectively managing slip angle. Front-to-rear torque split can go from 2:98 during a standing start to a maximum of 50:50[2] Models and ATTESA type[edit]

Nissan
Nissan
Model Year Released ATTESA type

Avenir 1990 ATTESA

Avenir 1998 ATTESA

Bluebird 1987 ATTESA

Primera 1991–1999 ATTESA

Prairie 1989 ATTESA

Prairie 1992 ATTESA

Prairie 1994 ATTESA

Pulsar 1989 ATTESA

Pulsar 1997 ATTESA

Pulsar 1999 ATTESA

Sunny 1989 ATTESA

Sunny 1992 ATTESA

Sunny 1997 ATTESA

Sunny 2000 ATTESA

ATTESA E-TS system is used in the following models:

R32 and R33 (1989–1997) GTR, GTS4 Skyline 1990–1994 Nissan
Nissan
Cefiro SE4, LNA31 Nissan
Nissan
Skyline GT-R - 1989–2003 Nissan
Nissan
Stagea Nissan
Nissan
Laurel C34 (1994-1997) and C35 (1997–2002) 1997–2003 Infiniti
Infiniti
QX4 Infiniti
Infiniti
G35x/G25x/G37x/ Nissan
Nissan
Skyline (V35 & V36) Infiniti
Infiniti
M35x/45x/37x/56x/ Nissan
Nissan
Fuga Infiniti
Infiniti
FX Infiniti
Infiniti
EX/ Nissan
Nissan
Skyline Crossover (with Active Brake Limited Split for side-to-side torque split, as needed) Nissan
Nissan
Cedric (GloriaCedric with RB25DET engine) Nissan
Nissan
Skyline Sedan 350GT FOUR Hybrid/ Infiniti
Infiniti
Q50

ATTESA E-TS Pro system is used in the following models:

R33 (1995–1997) Nissan
Nissan
Skyline GT-R (offered as a factory option) R33 Nissan
Nissan
Skyline GT-R V-spec R34 (1998–2002) Nissan
Nissan
Skyline GT-R (all models)

ATTESA E-TS Pro (GT-R version) is used in the following model(s).

2008+ Nissan
Nissan
GT-R

See also[edit]

4Matic
4Matic
- a four-wheel drive system from Mercedes-Benz 4motion
4motion
- a four-wheel drive system from Volkswagen All-Trac
All-Trac
- a four-wheel drive system from Toyota Nissan
Nissan
Bluebird Nissan
Nissan
Pulsar Nissan
Nissan
Skyline Nissan
Nissan
Skyline GT-R Quattro (four wheel drive system)
Quattro (four wheel drive system)
- a four-wheel drive system from Audi S-AWC
S-AWC
- a torque vectoring four-wheel drive system from Mitsubishi Motors SH-AWD - a four-wheel drive system from Honda Symmetrical All Wheel Drive - the four wheel drive system from Subaru

References[edit]

^ Video of ATTESA system components ^ 2008 Nissan
Nissan
GT-R - Engine and AWD System - First Look - Motor Trend

External links[edit]

Car Information Database (Nissan) Nissan
Nissan
Bluebird Car Club NZ

v t e

Nissan
Nissan
Motor Company

Marques

Current Datsun Infiniti Nissan Venucia1 Defunct/Integrated Prince Kurogane Aichi Shatai Sold Nissan
Nissan
Diesel

Divisions and subsidiaries

Autech Infiniti Nismo Nissan
Nissan
Motor India Private Limited Nissan
Nissan
Motor Manufacturing UK

Joint ventures

Dongfeng Motor Co., Ltd.
Dongfeng Motor Co., Ltd.
(50%) Ghandhara Nissan Nissan
Nissan
Motor Indonesia Nissan
Nissan
Philippines Renault–Nissan–Mitsubishi Alliance Tan Chong Motor

Shareholdings

Mitsubishi Motors
Mitsubishi Motors
(34%)

Current Datsun
Datsun
vehicles

redi-Go Go Go+ on-Do mi-Do

Current Nissan
Nissan
vehicles

Cars

370Z/Fairlady Z Altima/Teana Cima Dayz Fuga GT-R Lannia Latio/Versa Sedan/Almera/Sunny Leaf Livina/Grand Livina March/Micra Maxima Note/Versa Note Pulsar C12/Tiida Sentra/Sylphy/Pulsar B17 Skyline

Pickup Trucks

Clipper Truck D22 Frontier/Navara NP200 Patrol Cab Chassis Titan

SUVs/Crossovers

Armada Juke Kicks Murano Pathfinder Patrol Patrol Y61 Qashqai/Rogue Sport Rogue Terra Terrano X-Trail Xterra

Vans/Minivans

Caravan Cube Elgrand NV100 NV150 AD NV200/Evalia NV300 NV350 NV400 NV1500 NV2500 HD NV3500 HD Serena

Commercial trucks

NT100 Clipper NT400 Cabstar NT450 Atlas NT500

Buses

Civilian

Discontinued vehicles

DC-3 100NX 180SX 200SX B-210 240SX 240Z 280ZX 300C 300ZX 310 350Z 510 810 1200 Almera Tino Altra (EV) Aprio Auster Avenir Bassara Be-1 Bluebird Caball Cablight Cedric Cefiro Cherry Crew Datsun
Datsun
Truck Dualis Echo Expert Fairlady Figaro Gazelle Gloria Hardbody Truck Homy Hypermini Interstar Junior Kubistar Lafesta Largo Laurel Leopard Liberty Mistral Moco Multi Murano CrossCabriolet NX Paladin Pao Pino Pintara Platina Prairie Presage Presea Primastar Primera Prince Royal President Pulsar EXA Pulsar GTI-R Quest R390 GT1 R'nessa Rasheen Roadster-Road Star S-Cargo Saurus Saurus Jr Sileighty Silvia Skyline Crossover Skyline GT-R Stagea Stanza Terrano Terrano II Trade Vanette Violet Wingroad

Concept vehicles

126X 216X 240Z Concept 270X 300 Bambu 300 Seta 300XM 315-a AA-X Actic AD-1 AD-2 AL-X Alpha T Amenio AP-X AQ-X ARC-X AXY AZEAL Bevel BladeGlider Boga C-Note Chapeau Chappo Cocoon Compact Sport CONCEPT 2020 Vision Gran Turismo CQ-X Crossbow CUE-X Cypact Denki Cube Duad Dunehawk Effis Ellure Esflow ESV EV Guide II EV Truck Evalia Extrem FEV FEV-II Foria Forum Friend-ME Fusion Gobi GR-1 GR-2 Gripz Hi-Cross ideo IDS IDx IMx Intima Invitation Jikoo Judo Jura Kicks Kino KYXX Land Glider LEAF LUC-2 MID4 Mixim mm.e Moco Nails NCS NEO-X NRV-II Nuvu NV2500 NX-018 NX-21 Pivo Pivo 2 Pivo 3 Qazana Redigo Resonance Round Box Saurus Serenity Sport Concept Sport Sedan Stylish VI SUT Sway TeRRA Terranaut Tone Townpod Trailrunner TRI-X URGE UV-X Xmotion XIX XVL Yanya Z Concept Zaroot

Engines

Straight-3

HR UD

Straight-4

A BD C CA CD CG CR D E FJ G GA GB H HR J KA L LD MA MR NA QD QG QR SD SR TD UD YD Z ZD

Straight-6

FD H L LD P RB RD S20 SD TB TD UD

V

V6 VE VG VQ VR V8 UD VEJ30 VH VK VRH35 W64 Y V12 GRX-3 UD VRT35

Places

Nissan
Nissan
Engine Museum Nissan
Nissan
Proving Grounds Nissan
Nissan
Stadium (Nashville) Nissan
Nissan
Stadium (Yokohama)

Other

ATTESA CarWings dCi HICAS NAPS VVEL VVL Yokohama F. Marinos

1A brand of Dongfeng Motor Co., Ltd.

Categ

.