RF
2008-09-21 19:31:23 UTC
From Consumer Reports:
September 18, 2008
Driving Euro diesels from Audi, BMW, Chrysler, and
Mini
More than half the cars sold in Europe are
high-mpg diesels. So given the opportunity to
sample four models directly from the Continent, we
hoped to find out if modern European diesels are
good enough to entice American drivers.
Small-displacement engines with big torque and
fuel economy numbers have long been considered
forbidden fruit to the U.S. market. With the
revised, ultra-low-sulfur fuel recently adopted in
the States, we are seeing a slow influx of
European diesel models reach our shores.
Mercedes-Benz and Volkswagen have lead this wave
of new diesels, and several other automakers have
announced plans to bring more here.
So, what do we have to look forward to? We got a
taste last week by attending the annual
International Motor Press Association (IMPA) track
days at Pocono Raceway, where we piloted several
imported diesel models provided by Bosch. We
sampled four European-market diesel models: 2009
Audi A4 3.0 TDI Quattro, 2007 BMW 123d hatchback,
2007 Chrysler 300D, and 2008 Mini Cooper D. (Bosch
supplies some of the fuel injection and emissions
control equipment for these cars that allow them
to meet stringent air quality standards in Europe.
They say the cars could also be made 50-state
compliant in the U.S.)
In our review of the Mercedes-Benz E320 Bluetec
diesel last year, we raved that its modern diesel
engine was not only clean, but also felt as smooth
and powerful as a gasoline engine. (Watch our
video road test.)
In driving the four European cars at IMPA, it is
clear that modern diesels are much smoother and
quieter than those engines Americans may remember
from the 1980s. But not all are as refined as gas
engines, or as that E320.
I was very impressed with the Audi A4 3.0 TDI.
This A4 has 236 hp and a whopping 369 lb-ft of
torque, giving it impressive acceleration. The car
was also quiet, relaxed, and refined in driving on
the street. It’s rated at a combined 36 mpg on the
European fuel economy test cycle. And several of
us came away from a lap around the road course
wearing wide smiles.
The Mini Cooper D gets impressive fuel economy
(rated at 60 mpg combined on the European fuel
economy test cycle). The Cooper D driven at Pocono
didn’t require as much shifting as our base Mini
Cooper with a manual transmission to stay in the
power band, but it had a notably gruff engine
sound. The same was true for the torquey and
entertaining BMW 123d hatchback, which was rated
at 45 mpg overall. Both the Mini and the BMW
included an auto-stop feature that shut the engine
off when the car was stopped to avoid wasting fuel
when idling.
Bosch tells us the Chrysler 300D uses the same
3.0-liter V6 diesel engine as the Mercedes we
tested. It was plenty powerful in the Chrysler,
but not as smooth as in the Mercedes. (Also, we
smelled diesel fumes after making a U-turn,
whereas we couldn’t smell a thing in the Mercedes,
even with our nose near the tailpipe while it was
idling.) It’s rated at 35 mpg overall.
In the end, the lesson is that while modern
technology has dramatically reduced diesel
vibration and sluggishness, they aren’t as smooth
as the best gas engines. Powertrain noise and
vibration suppression are a combination of engine
design, noise reduction under hood, and engine
mounting technology. Nevertheless, the sacrifices
to drive a diesel are much smaller than they once
were, making the fuel economy improvements and
abundant torque all the more compelling.
Now if only diesel fuel prices were closer to
regular gasoline…
—Eric Evarts
September 18, 2008
Driving Euro diesels from Audi, BMW, Chrysler, and
Mini
More than half the cars sold in Europe are
high-mpg diesels. So given the opportunity to
sample four models directly from the Continent, we
hoped to find out if modern European diesels are
good enough to entice American drivers.
Small-displacement engines with big torque and
fuel economy numbers have long been considered
forbidden fruit to the U.S. market. With the
revised, ultra-low-sulfur fuel recently adopted in
the States, we are seeing a slow influx of
European diesel models reach our shores.
Mercedes-Benz and Volkswagen have lead this wave
of new diesels, and several other automakers have
announced plans to bring more here.
So, what do we have to look forward to? We got a
taste last week by attending the annual
International Motor Press Association (IMPA) track
days at Pocono Raceway, where we piloted several
imported diesel models provided by Bosch. We
sampled four European-market diesel models: 2009
Audi A4 3.0 TDI Quattro, 2007 BMW 123d hatchback,
2007 Chrysler 300D, and 2008 Mini Cooper D. (Bosch
supplies some of the fuel injection and emissions
control equipment for these cars that allow them
to meet stringent air quality standards in Europe.
They say the cars could also be made 50-state
compliant in the U.S.)
In our review of the Mercedes-Benz E320 Bluetec
diesel last year, we raved that its modern diesel
engine was not only clean, but also felt as smooth
and powerful as a gasoline engine. (Watch our
video road test.)
In driving the four European cars at IMPA, it is
clear that modern diesels are much smoother and
quieter than those engines Americans may remember
from the 1980s. But not all are as refined as gas
engines, or as that E320.
I was very impressed with the Audi A4 3.0 TDI.
This A4 has 236 hp and a whopping 369 lb-ft of
torque, giving it impressive acceleration. The car
was also quiet, relaxed, and refined in driving on
the street. It’s rated at a combined 36 mpg on the
European fuel economy test cycle. And several of
us came away from a lap around the road course
wearing wide smiles.
The Mini Cooper D gets impressive fuel economy
(rated at 60 mpg combined on the European fuel
economy test cycle). The Cooper D driven at Pocono
didn’t require as much shifting as our base Mini
Cooper with a manual transmission to stay in the
power band, but it had a notably gruff engine
sound. The same was true for the torquey and
entertaining BMW 123d hatchback, which was rated
at 45 mpg overall. Both the Mini and the BMW
included an auto-stop feature that shut the engine
off when the car was stopped to avoid wasting fuel
when idling.
Bosch tells us the Chrysler 300D uses the same
3.0-liter V6 diesel engine as the Mercedes we
tested. It was plenty powerful in the Chrysler,
but not as smooth as in the Mercedes. (Also, we
smelled diesel fumes after making a U-turn,
whereas we couldn’t smell a thing in the Mercedes,
even with our nose near the tailpipe while it was
idling.) It’s rated at 35 mpg overall.
In the end, the lesson is that while modern
technology has dramatically reduced diesel
vibration and sluggishness, they aren’t as smooth
as the best gas engines. Powertrain noise and
vibration suppression are a combination of engine
design, noise reduction under hood, and engine
mounting technology. Nevertheless, the sacrifices
to drive a diesel are much smaller than they once
were, making the fuel economy improvements and
abundant torque all the more compelling.
Now if only diesel fuel prices were closer to
regular gasoline…
—Eric Evarts