Skip to main content

ads1

First Drive: 2008 Volkswagen Jetta TDI

Volkswagen’s 50-state-compliant Jetta TDI will be among the cleanest diesels in the U.S.

Previews

Amid the looming hordes of European luxury automakers planning a North American compression-ignition invasion in the next couple years, humble Volkswagen has announced its plans to return the Jetta TDI to the diesel dogpile in the spring of 2008. Powered by a new 2.0-liter four-cylinder making 140 hp and 236 lb-ft of torque, and either a six-speed manual or DSG automated manual transmission, the 2008 Jetta TDI will be cleared for sale in all fifty states.

Some of the earlier diesels to make it to our shores over the next few years will only be available in 45 states; California, Maine, Massachusetts, New York, and Vermont have all adopted stricter emissions regulations for diesels that bar some vehicles from entry. Using technology developed under the BlueTec cooperative formed by Mercedes-Benz and Volkswagen, the Jetta TDI will slip by these stricter regulations without resorting to a urea-based exhaust treatment, as many BlueTec labeled models will.

Nitrogen oxides (NOx) are, along with particulate emissions (soot), the biggest hurdles facing diesels in the U.S. Most BlueTec vehicles will control NOx by injecting a urea-based solution called AdBlue into the exhaust system upstream of a catalytic converter that specifically targets NOx. In that catalytic converter, the ammonia in the urea reacts with the NOx in the exhaust gas and neutralizes it into nitrogen and water.

Volkswagen’s Jetta TDI will manage without a urea injection system by using a NOx-storage catalyst. Like the particulate filters in place on this car as well as other diesels, this catalyst is basically a trap that temporarily holds the offensive emissions. Periodically, the engine will switch to a richer air-fuel mixture that will create a hotter exhaust gas and burn off the material in the traps.

From the driver’s seat, this rich-burn cycle is imperceptible. We had a chance to drive a near-production Jetta TDI and were pleasantly reassured by the transparency of not just the BlueTec technology keeping the car clean, but the diesel engine overall. Horsepower in this new 2.0-liter common-rail diesel engine is up 40% over the previous 1.9-liter four-cylinder, with torque up 33%. Those figures mean an increase in drivability of about 500%. With the previous engine, the best performance we managed to coax from a Jetta TDI was a sluggish 10.3 second 0-60 wheez. The additional power and torque produced by this new, cleaner engine bring that number down to somewhere in the low- to mid-eight second range. Under less aggressive feet, the TDI’s prodigious torque effortlessly whisks the Jetta away from stops and around traffic.


More Driving Impressions

Along with particulate and NOx emissions, BlueTec is rapidly abolishing that characteristic cylinder-full-of-pebbles diesel clatter as well. At idle, the driver has to be paying very close attention to notice that the engine underhood is popping diesel fuel rather than gasoline. Under acceleration, the exhaust sound is a little deeper and boomier than a gasoline Jetta, but not too noticeable to the average sorority member, a demographic that hoards transporter-loads of Jettas here in Ann Arbor. If they’re not used to running a gasoline engine up to redline (truncated in the diesel at just 4500 rpm), the only thing the Tri Delts will notice while driving the TDI is the inordinate number of leering stares they get at the diesel pumps.

Despite the BlueTec partnership, Volkswagen will refrain from using the BlueTec name on the Jetta TDI. Early information suggests that consumers associate BlueTec with Mercedes-Benz and incorrectly assume that a Volkswagen with a BlueTec badge is powered by a Mercedes engine.

Incidentally, to celebrate thirty years of selling diesels in the U.S. Volkswagen is searching for both the oldest and the highest-mileage diesel VWs still running their original engines. If you think your car could be a contender for one (or both) honors, go to www.vw.com starting March 1 to enter your car. VW is expecting at least one to be a 1977 Rabbit diesel. We know a guy who ran one at the 24 Hours of LeMons in October…

BY JARED GALL
www.caranddriver.com
Labels:

Comments

Post a Comment

Popular posts from this blog

Next NSXext revealed at Detroit show

Honda’s next supercar will not be mid-engined if this show-stealing concept coupe is anything to go by, writes Dave Moore. To get cut-through among the dozen-plus concept coupes on display at Detroit last week, you really did have to come up with something special. It seemed that just about everybody had something close-coupled and muscular on display, but Honda’s US luxury arm, Acura, managed to attract most attention with what it messily labels its Advanced Sports Car Concept , or ASCC for short. While Honda will not confirm that the ASCC is a replacement for the much- loved but slow-selling NSX , it has put on record that the front-engined show car marks a preview of the design direction for that car’s successor. It is expected that the Tokyo Motor Show in October this year will mark the production debut of the actual NSX replacement. The concept is designed to incorporate a powerful front- mounted, V-10 engine and a new high-performance, rear- wheel-drive based version of the H...
2 comments
Read more

2007 Alpine Imprint RLS Demo Car based on Mercedes-Benz R500

Making Its Mark: The IMPRINT RLS The birth of the IMPRINT RLS marks the beginning of a new sonic era. While the exterior flaunts a sleek, elegant, one-of-a-kind style, the interior also houses the core Alpine IMPRINT sound technology – making its mark as the absolute show-stopping vehicle for 2007. The IMPRINT RLS by birthright started off as a Mercedes Benz R500 , and was slowly morphed into a car that transcends all laws of space and time. This futuristic concept-like car was brought to life by Alpine’s Advanced Application R&D team, Steve Brown, Gary Bell, Brent Davison with the help of Alpine Canada’s Glen Swackhamer and Rino Odorico. Breathing life into the RLS required a complete dismantling, relocating, building, and reinforcing experiment. Extreme modifications include gas and brake pedal relocation to allow the car to be driven from either front seat. To continue Alpine tradition of unconventional door and seat combinations, the IMPRINT RLS features a unique rotating assem...
Post a Comment
Read more

NAIAS Detroit 2007: Volkswagen continues BLUETEC offensive

Volkswagen is presenting the Concept Tiguan SUV study at the North American International Auto Show. In the first half of next year the series version of the “Touareg’s little brother” will be debuting in the US. The Tiguan is being advanced as a significant component in Volkswagen’s model range in order to expand the market position in the US. Moreover, Volkswagen expects additional US growth starting in 2008 from the market launch of the cleanest TDI of all times. The introduction of the Turbodiesel direct injection engine equipped with a NOx secondary treatment system is taking place as part of the BLUETEC offensive in the latest Jetta– the most successful car in America from a German manufacturer. European injection technologies are increasingly convincing US customers: In 2006 Volkswagen of America had sales 4.9 percent above the previous year. This corresponds to 235,140 vehicles sold in the US. The positive signs for 2007 include the Eos being offered for the first time over an ...
4 comments
Read more