What is the difference between quattro in the A4 and quattro in the TT?
04-23-2004, 08:17 AM
#21
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Okay.... here is my REAL question about quattro...
In the A4, are all four corners pulling all the time? If so, what % front wheels vs. back wheels?
In the TT, are all four corners pulling all the time? If so, what % front wheels vs. back wheels?
This is really all I care about. I don't care so much about the technology behind it... My concern is where the rubber meets the road.
In the TT, are all four corners pulling all the time? If so, what % front wheels vs. back wheels?
This is really all I care about. I don't care so much about the technology behind it... My concern is where the rubber meets the road.
04-23-2004, 08:24 AM
#22
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Assuming completely level ground...
equal turf under each wheel and a perfectly straight line:
In A4 at slow speeds, yes all four wheels should have equal power. Once the A4 gets above about 25mph, the EDL's kick off and then, it could be that just two wheels are getting power, it gets very complicated.
I'm not so sure about the TT because with the Haldex clutch, software can be set to supply unequal power to the wheels durring acceleration, or cruising. So to answer this question, one would have to do a bunch of research. I would tend to imagine that it is unequal distribution.
In A4 at slow speeds, yes all four wheels should have equal power. Once the A4 gets above about 25mph, the EDL's kick off and then, it could be that just two wheels are getting power, it gets very complicated.
I'm not so sure about the TT because with the Haldex clutch, software can be set to supply unequal power to the wheels durring acceleration, or cruising. So to answer this question, one would have to do a bunch of research. I would tend to imagine that it is unequal distribution.
04-23-2004, 08:52 AM
#24
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Wrong - the 4X Motion system does not use Haldex .....
<center><img src="http://www.vwvortex.com/gallery/albums//Volkswagen/Touareg/Touareg%20(European)/037.jpg"></center><p>nor does it use Torsen. It was codeveloped by Porsche and VAG specifically for the Touareg and Cayenne. As you can see from this diagram - it is bascially a RWD based system with a transfer case to drive the front wheels.
04-23-2004, 08:54 AM
#26
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Actually the Torsen system and Haldex systems are similar in cost
but the Haldex requires fluid changes every 20k which the torsen doesn't. The cost over time will be more due to the need for special tools and fluid to maintain the haldex system.
04-23-2004, 08:58 AM
#27
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Actually, the torsen is split 50-50 all the time and the TT is primarily fwd
depending on torque load and vehicle dynamics. The Torsen will transfer power up to 67% front or rear depending on engine torque load and other factors. The TT's Haldex system will distribute torque as well based upon engine torque, wheel slippage etc.
04-23-2004, 12:07 PM
#28
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I believe the riddle you are spouting is that the Passat uses Torsen, and the TT uses Haldex...
4Motion and Quattro are just marketing trademarks. That's why TTs say Quattro. The A3 line uses Haldex too.
