Touareg TDI, then and now.
Since then, VW has been embracing engine downsizing in a major way, such as developing a 3.0-liter V6 diesel that's now available in the Touareg. It produces 225 hp and 407 Ib-ft of torque, so it is still capable of towing 7,716 lb as the V10. While it is a bit slower (0 to 60 mph in 8.7 seconds rather than 7.7 seconds--although who is drag racing substantial SUVs?), it turns in better highway fuel efficiency--17 mpg city/25 mpg highway--and is 520 lb. lighter at the curb than its predecessor.
The V6 TDI is the first diesel in a new generation of V-engines from VW with a 90[degrees] bank angle. There is a 90-mm distance between the cylinders. The cylinder housing is vermicular graphite cast iron, which VW notes is 15% lighter than conventional cast iron. Along with its chain drive, the design principle makes for a very compact 17.3-in. long engine. A Honeywell/Garrett turbocharger provides boost.
The V10 may have been the first off-road, turbo-diesel, light-duty vehicle in the U.S. market with a particulate filter, but it still left its [CO.sub.2] mark with 469 grams/mile; while the V6, coupled with an AdBlue (urea) after treatment system, puts out 420 grams/mile in combined city and highway driving.
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|Publication:||Automotive Design & Production|
|Date:||Jul 1, 2009|
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