Jump to content
SAU Community

Recommended Posts

I am looking at a R32 GTS4-T BNR32

i am curious to know is these are constant all wheel drive or can they be selected to both rear wheel or all wheel? i have seen before that they can be selected to either?

my second question is what does BNR32 stand for?

My last question is what are the diff ratios in the turbo R32s? both the rear wheel drive gts-ts and the GTS4-T version?

Looking to buy an 89 model, is there anything specific that i should be wary of when looking?

Does the RB20 have a timing belt or chain? if a belt then how regually should these be changed?

cheers all

Edited by TUF250
Link to comment
https://www.sau.com.au/forums/topic/266444-r32-gts4-t-information/
Share on other sites

i am curious to know is these are constant all wheel drive or can they be selected to both rear wheel or all wheel? i have seen before that they can be selected to either?

Constant. They can however be altered using an aftermarket torque split controller.

my second question is what does BNR32 stand for?

Gts-t's are HCR, Gts-4's are HNR, GT-R are BNR

Does the RB20 have a timing belt or chain? if a belt then how regually should these be changed?

Belt, 100,000 km's

Constant.

No, 'constant' = all the time, but GTS4 and GTR are RWD cars which have the capability of also applying drive to the front wheels when dictated by the ATTESA controller using input from certain sensors (eg G-sensor). Aftermarket controllers over-ride the sensors and allow application of 100% drive to the front wheels (ie 'constant' 4WD), but that is not 'normal'.

No, 'constant' = all the time, but GTS4 and GTR are RWD cars which have the capability of also applying drive to the front wheels when dictated by the ATTESA controller using input from certain sensors (eg G-sensor). Aftermarket controllers over-ride the sensors and allow application of 100% drive to the front wheels (ie 'constant' 4WD), but that is not 'normal'.

so your saying that the R32s GTS4 and GTR use a RWD system but in certain conditions, i assume heavy acceleration they apply drive to the wheels as well? can this be turned to RWD only?

any idea on the diff ratio of these turbo R32s?

cheers

so your saying that the R32s GTS4 and GTR use a RWD system but in certain conditions, i assume heavy acceleration they apply drive to the wheels as well? can this be turned to RWD only?

any idea on the diff ratio of these turbo R32s?

The G-sensor detects fore/aft accel/decel as well as lateral (sideways) accel, and ATTESA also uses inputs from the ABS sensors on each wheel to determine whether drive to the front wheels needs to be engaged. So under hard acceleration if rear wheel spin (slip) is detected, the front wheels will be engaged to some extent determined by the ATTESA controller. For RWD only, a controller is probably the simplest method since it's just a case of plug-and-play.

R32/R33 GTR's use 4.1 diff ratio, R32 GTS4 uses something like 4.3.

Edited by SteveL

All-wheel drive (AWD) is often used to describe a "full time" 4WD that may be used on dry pavement without destroying the drivetrain, although the term may be abused when marketing a vehicle.

AWD can be used on dry pavement because it employs a center differential, which allows each tire to rotate at a different speed. ("Full-Time" 4WD can be disengaged and the center differential can be locked, essentially turning it into regular selectable 4WD).

On the other hand, AWD cannot be disengaged and the center differential cannot be locked. This eliminates driveline binding, wheel hop, and other driveline issues associated with the use of 4WD on dry pavement. With vehicles with more than four wheels, constant AWD means all wheels drive the vehicle, to varying degrees of engagement, while 4WD means only four of the wheels drive the vehicle continuously.

Constant is non-selectable but provides traction to varying degrees whereas selectable can be applied manually from AWD to 2WD.

Semantics.......

GTS4 diff ratio = 4.375:1

As SteveL has said, GT-R / GTS4 are basically a RWD driveline. They employ an active AWD system which responds to G-sensors, ABS sensors (for wheel spin) and TPS (throttle) inputs, to determine the optimum distribution of front and rear drive. The maximum drive to the front is 50% of the available power.

The aftermarket controllers modify the various input signals before passing them to the ATTESSA controller, thus fooling the controller into thinking that something slightly different is happening.

The drive can be converted to 100% RWD by removing the drive shaft between the centre differential and the front differential (or by removing the fuse, or by tweaking the aftermarket controller).

The engine uses a timing belt, which needs to be changed at 100k intervals.

The GT-R and Gts-4 ATTESA utilises what is mostly a conventional RWD gearbox. Although exclusively AWD, ATTESA-ETS is also used in Nissan models that are also available as RWD such as the A31 Cefiro which was the second Nissan to feature the system exactly a year later in August 1990.

Drive to the rear wheels is constant via a tailshaft and rear differential, however drive to the front wheels is more complex by utilising a transfer case at the rear of the gearbox. The drive for the front wheels comes from a transfer case bolted on the end of an almost traditional RWD transmission although the bell housing is slightly different to allow the driveshaft for the front wheels to pass it, the main body is exactly the same as the RWD transmission, the tail-shaft is different to couple to the transfer case.

A short driveshaft for the front wheels exits the transfer case on the right side. Inside the transfer case a chain drives a multi-plate wet clutch pack. Torque is apportioned using a clutch pack center differential. On the rear differential is a high pressure electric oil pump, this pump pressurises Normal ATF oil (0-288psi) into the transfer case to engage the clutch pack. The higher the oil pressure the transfer case is supplied with, the more the clutch pack engages, this is how the torque to the front wheels is varied. The front driveshaft runs along the right side of the transmission, into a differential located on the right of the engine's sump. The front right axle is shorter than the left, as the differential is closer to the right wheel. The front left axle runs through the engine's sump to the left wheel.

The ATTESA-ETS layout is more advanced than the ATTESA system, and uses a 16bit microprocessor that monitors the cars movements at 100 times per second to sense traction loss by measuring the speed of each wheel via the ABS sensors. A three axis G-Sensor mounted underneath the center console feed lateral and longitudinal inputs into an ECU, which controls both the ATTESA-ETS 4WD system and the ABS system.

The ECU can then direct up to and including 50% of the power to the front wheels. When slip is detected on one of the rear wheels (rear wheels turn 5% or more than the front wheels), the system directs torque to the front wheels which run a viscous LSD.

Rather than locking the AWD in all the time or having a system that is "all or nothing", the ATTESA-ETS system can apportion different ratios of torque 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. The advantage to a more traditional ATTESA (Viscous LSD) system is response in hundredths of a second.

Most vehicle manufacturers refer to this system as constant due to the fact that there is no in-cab lever to disengage the AWD system. As in early 4WD systems, the transfer case lever is selectable to either RWD, 4WD high range, 4WD low range, and neutral. As there is no transfer case lever present to disengage AWD, it is referred to as constant even though the rear wheels do 90% of the driving, thus the term constant was born.

I myself find it a bit hard to accept the term "constant" as I define the term as all 4 wheels driving full time. But as the manufacturers have adopted the term due to the above reasons, I have to go with the flow and accept their reasoning. As banal as I may think it.

it is not constant AWD. it's constantly VARIABLE AWD. or continuously variable AWD.

and guys there is no centre diff.

GTR has gearbox, transfer case and front and rear diff.

drive goes engine to gearbox. and from the back of the box to the transfer case. out the back goes the drive to the rear diff. on the front of the transfer case goes the drive to the front diff. it uses a multiplate wet hydraulic clutch system to regulate drive to the front and is computer controlled. the computer relies mostly on the G-sensor to decide how much pressure to pump into the transfer case and therefore how much front drive to give. but it also receives wheel speed via the ABS sensors, steering angle via the steering angle sensor (used for HICAS) and throttle position too from the TPS.

to get 100% RWD is very simple. just pull the engine bay mounted AWD fuse. this will only disable AWD. there is also an in cabin fuse you can pull but it will disable AWD and ABS. you can easily rig up a switch to either of those fuses. many of the aftermarket controllers have a 100% RWD function also. there is one other way to trick the car into RWD and that is to turn off the engine whilst the car is in motion (above 20km/h) and then restart it again whilst still in motion. every time the car is started the ABS centres do a self check. as the car is moving they cannot complete that check and cause a fault which puts the ABS and AWD into limp mode (ie off mode). once you come to a complete stop they will perform the calibration check and AWD and ABS will return.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


×
×
  • Create New...