Re: Lesson learnt
Posted: Tue Jan 27, 2009 10:37 am
motion i like the idea of the pulsar being similar but the driver does not know what his car can do so asking him advice would be wrong
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Hmmmm...I don't think rigidity is an influencing factor yet. I do believe that the fundamental differences as highlighted by Sci give credence to his stance unless someone can shoot those arguments down.motion sickness wrote:They are both mechanical type systems not electronic based like the newer versions so yes they act similar. The drive wheels may be on different ends, but the result is the same when slip is detected.
Not because Nascar doesn't run his car every minute doesn't mean he doesn't run his car or can't handle it either. Plus his car is way more rigid than the R32, due to the cage + coilovers.
The Center Differential on the GTR is electric controlled. You can buy Aftermarket ATTESSA ETSmotion sickness wrote:They are both mechanical type systems not electronic based like the newer versions so yes they act similar. The drive wheels may be on different ends, but the result is the same when slip is detected.
Not because Nascar doesn't run his car every minute doesn't mean he doesn't run his car or can't handle it either. Plus his car is way more rigid than the R32, due to the cage + coilovers.
http://en.wikipedia.org/wiki/ATTESAATTESA-ETS
The Electronic Torque Split version off this all-wheel drive architecture was developed for usage in Nissan's north-south layout vehicles, and was first used in August 1989 in the R32 Nissan Skyline GT-R and Nissan Skyline GTS4. It utilizes what is mostly a conventional RWD gearbox. Although the Skyline GT-R is exclusively AWD, ATTESA-ETS is also used in Nissan models that are also available as RWD such as the A31 Nissan 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 utilizing 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, similar to the type employed in the Steyr-Daimler-Puch system in the Porsche 959. On the rear differential is a high pressure electric oil pump, this pump pressurises Normal ATF oil (0-288psi) into the transfercase to engage the clutchpack. 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 transfer case has its own dedicated ATF (Nissan special ATF) oil to lubricate the chain/clutch pack. The front driveshaft runs along the right side of the transmission, into a differential located on the right of the engine's oilpan. 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.
Starboy_X wrote:So I've been reflecting on my mishap and I have realised that I will be having a problem. Through hard corners I don't anticipate it but through the gentle bends is where I forsee it happening. My natural in these gentle bends is to go in really hard and ease up as the car starts to slip which works fine in RWD, I mean I was thinking about some of the previous corners and I basically accelerated right through the hard corners and never really got off the gas, don't get me wrong I was not floor board or anything but I was accelerating right through. I think that was the first "high speed" corner and i had kind of eased off gas. Anyway can anyone give some CONSTRUCTIVE advice as to how to deal with this because I will basically need to reprogram my brain on how to drive and I'm not sure how to do it.
Starboy_X wrote:I don't think suspension upgrades would have helped me, from talking to a GTR owner in St. Lucia what he said I had to do was keep on the throttle and I would have been fine. I will test out that theory as soon as possible.