Tech question - Why is the Torsen considered proactive?
05-17-2010, 04:34 PM
#12
AudiWorld Expert
I have expressed my beliefs in a system that stays constant. My thoughts are that if you have a system that starts to transfer torque to the wheels that have traction you will soon reach a point that due to the geometry of the situation that the remaining wheel(s) will lose the traction they have because you are overpowering the situation.
05-17-2010, 04:41 PM
#13
AudiWorld Senior Member
I have expressed my beliefs in a system that stays constant. My thoughts are that if you have a system that starts to transfer torque to the wheels that have traction you will soon reach a point that due to the geometry of the situation that the remaining wheel(s) will lose the traction they have because you are overpowering the situation.
+2 (though I had to reread what the heck)
I learnt this with Mercedes G with three 100% mechanical locks (front-middle-rear) when I was playing on hipdeep snow.
With all locks on and idling on low range it just climbed over the snow bank but if I released front or rear lock and pressed gas it sunk and got itself highcentered and I had to spend few hours to shoveling undercarriage clear and then ramps to move on. I did the showeling once and almost twice until I learnt my lesson that power does not always help.
05-18-2010, 05:59 AM
#14
Here is a video comparing the Quattro system to others:
http://video.google.com/videoplay?do...5126892796503#
http://video.google.com/videoplay?do...5126892796503#
05-19-2010, 04:25 AM
#15
AudiWorld Super User
With the Q5 going to be my first Audi, I've read up and become fascinated by Quattro and AWD technology.
The Torsen differential is an amazing piece of work. There are a few posts on some of the other forums on Audiworld, but fairly old. Torsen has been mentioned as being a proactive differential, compared to other diff types that are reactive, where reactive here means there has to be some wheel slippage occurring first.
But isn't that what the Torsen is responding to as well? When there's less torque on one shaft, the diff sends a multiple of that torque to the other shaft. But doesn't less torque on a shaft and it spinning faster due to wheel spin?
Seems like it's 'reacting' as well, though it's doing so faster than a viscous or clutch type diff can.
The Torsen differential is an amazing piece of work. There are a few posts on some of the other forums on Audiworld, but fairly old. Torsen has been mentioned as being a proactive differential, compared to other diff types that are reactive, where reactive here means there has to be some wheel slippage occurring first.
But isn't that what the Torsen is responding to as well? When there's less torque on one shaft, the diff sends a multiple of that torque to the other shaft. But doesn't less torque on a shaft and it spinning faster due to wheel spin?
Seems like it's 'reacting' as well, though it's doing so faster than a viscous or clutch type diff can.
05-19-2010, 05:25 AM
#16
AudiWorld Senior Member
How many times I need to cut the wings to keep this from flying....
NO awd in this world is proactive.
Even Torsen and its gearing in the differential is not functioning when there is no wheel slippage.
All systems require revolution difference and that means those are reactive.
Like I said earlier, driver is only "thing" that can be proactive if paying attention.
Someway new cruise control they sell in Europe that haves radar to detect cars ahead to control the distance and to reduce the speed can be considered as proactive cruise control from slowing down stand point, from accelerating stand point it is still reactive as it have to sense rolling resistance increase from uphill etc to give more gas.
NO awd in this world is proactive.
Even Torsen and its gearing in the differential is not functioning when there is no wheel slippage.
All systems require revolution difference and that means those are reactive.
Like I said earlier, driver is only "thing" that can be proactive if paying attention.
Someway new cruise control they sell in Europe that haves radar to detect cars ahead to control the distance and to reduce the speed can be considered as proactive cruise control from slowing down stand point, from accelerating stand point it is still reactive as it have to sense rolling resistance increase from uphill etc to give more gas.
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