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26.07.2011: If you have any valuable information (scans, pictures) about four wheel drive vehicles, please send them to |
1-15 of 19 Comments
January 09, 2011 - 03:38
It should be known that quattro generations 2-4 do NOT use a type 2 torsen. These are all type 1 torsen center differentials. February 11, 2011 - 20:02
I think all 5 speed automatics use the Torsen2. I don't remember what the early 1990's 4 speed automatics use? There hasn't been a manual shift transmission 'Quattro' with a Torsen2. April 23, 2010 - 16:27
Dave - you were absolutely correct. Any "new" models since the 2005 RS4 have no longer been using Torsen. I just saw this official Audi site that confirmed it (see below). They have been using a "self locking center differential". It appears the "crown gear differential" is an evolution of that. www.audi-quattro-highlights.com BTW - where did you find the patent information? March 05, 2010 - 08:51
this is the press release about the sport differential a couple of years ago. Most interestingly it is active even when you lift off of the throttle. I wonder how this compares to other systems...?? March 05, 2010 - 08:40
This link was a part of the press release for the 30th year of quattro....which is why it's launching on the RS5. Apparently they say it's lighter and more compact as far as the center differential. They also explain about "electronic torque vectoring" (which Volvo also notes their new S60 has). My only question is - why move from Torsen and develop a system on your own? I thought they were good parterns but I guess they want a proprietary system (the Lexus LS now licenses the Torsen system)....?? April 09, 2010 - 13:46
Put simply, three reasons: 1. the patent Audi had for the torsen expired in 2004. February 28, 2010 - 11:43
Audi RS5
Hi A really good description of all the quatro types! Regards, Hans Simonsen February 28, 2010 - 17:27
Re: Audi RS5
Thanks, I've added this system to the list, but I am still lacking the details, as this is something really new. April 09, 2010 - 13:54
Re: Audi RS5
the static torque bias is created by using differrent gearing between the spider gears and the front and rear crown gears (front smaller). a very neat trick. there are 2 clutch packs which will progressively lock the respective output shaft to the carrier so preventing spin-up and controlling the torque split. the carrier, clutch packs and gears are all packaged in a very small "can" whcih allows for lower weight and greater efficiency. looks like a nice design - fully acive crontol (unlike the torsen). it says a lot when audi releases the rs5 without the sport differential standard - instead making do with EDL-based 4-wheel torque vectoring. December 07, 2009 - 23:11
some words to quattro system (Torsen)
As I said before, I've checked that Audi video (test Torsen) some time ago, and I have to say I was very surprised by behaving of Torsen differential. I thought that car will be promptly away from rollers, but he had to accelerate to go away... And now I found this video which I shouldn't see - www.youtube.com !!! Same situation, same result! Can't understand it! December 08, 2009 - 18:31
Re: some words to quattro system (Torsen)
Yes, this is a very interesting feature of TorSen. The Quattro II description on this page explains why this behaviour is happening. In this situation, driver has to apply brakes to the spinning wheels and TorSen will transfer torque to the wheels with traction. December 08, 2009 - 20:45
Re: some words to quattro system (Torsen)
i think i understood it, according to Torque Bias Ratio of Torsen diff, for example 4,0:1, diff is able to transfer up to 80% of torque to axle with better traction... so the minimal torque on the slipping axle, which can cause limited-slippage, is 20%... if its lower, torsen behaves as open diff and u have to help yourself by park break (in case of slipping rear axle) or lightly pushing break pedal (dunno if it works) (in case of slipping front axle)... in case of torsen in rear axle and one wheel slipping in air, the same process as with slipping front axle (?)... January 16, 2010 - 03:49
Re: some words to quattro system (Torsen)
That kind of video shows how disingenuous some people are. March 11, 2010 - 01:05
Re: some words to quattro system (Torsen)
George that is a good explanation about tractive force and the transfer of torque. How does the new crown gear compare to the Torsen in that regard? Leave a Comment
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