The base 2008 Porsche
Cayenne’s V6 grows from 3.2 to 3.6 liters, while the
V8-powered S & Turbo models now boast 4.8 liters, up
from 4.5. Output increases accordingly, though the extra
displacement is only partly responsible.
All three engines for the 2008 Porsche Cayenne get
gasoline direct injection (Porsche calls it Direct Fuel
Injection), a first for the automaker & a harbinger of
the powertrain changes we’ll see later this year when
the new 911 bows. DFI involves injecting fuel straight
into the combustion chamber, where it mixes with air &
produces a cooler charge than is possible with more
conventional injection into the air intake port. DFI
also allows for more efficient combustion & therefore
less emissions & better fuel economy.
On top of DFI, the V8 also employs Porsche’s trademark
VarioCam Plus system, which adjusts valve timing & lift
during high-load situations, & all but the Turbo use
intake manifolds with variable-length runners.
Combined, these changes boost the output in the V6 2008
Porsche Cayenne to 290 hp & 283 lb-ft of torque from 247
hp & 229 lb-ft, whereas the 2008 Porsche Cayenne S now
cranks out 385 hp & 369 lb-ft—with more than 90 percent
of that available between 2000 & 6000 revs—up from 340
hp & 310 lb-ft. Porsche claims the V6 2008 Porsche
Cayenne now runs from 0 to 60 mph in 7.5 seconds, while
the S will do the same in 6.4.
The twin-turbocharged 2008 Porsche Cayenne 4.8-liter V8
found in the Cayenne Turbo now sports a whopping 500 hp
& 516 lb-ft, or 50 more horses & 56 more lb-ft of torque
than the outgoing model. Porsche says that’s good for a
4.9-second dash to 60 mph & a top speed of 171 mph.. |
