AD&P; > October 2013 > NOTABLE
Incredible Turbo from Cadillac.
Cadillac has launched its Twin-Turbo V6 in the 2014 XTS
Vsport full-size sedan, where it produces 410 hp in the car,
and remarkably, little sensation of turbo-lag. Explained
Richard Bartlett, Cadillac assistant chief engineer for the
3.6-liter engine, "By creating a very short path from the
turbos"—they've deployed two smaller turbochargers rather
than one, larger turbo—"to the throttle body"—which is top-
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Driving progress
mounted and centrally located—"the
compressors are able to draw air
directly from the inlet box and send
pressurized air through the intercooler
immediately. This gives the driver
a more immediate feeling of power
on demand." And just as there are
two turbos, there is a twin-brick
confguration for the charge-cooling
heat exchangers, which reduce the
air charge temperature by >130°F.
It is estimated that the air routing
volume is reduced by >60% compared
to conventional designs with chassismounted heat exchangers and that
the cooling efciency of the waterto-air cooler system is >80% with
approximately just 1 psi of air fow
restriction at peak power. The engine
is based on the 60°, 3.6-liter DOHC
V6 available in the XTS and other
models, but Bartlett points out that
the engine has been extensively
modifed, including all new block
and head castings, strengthened con
rods, new aluminum pistons, a new
direct-injection fuel system, and
an aluminum intake manifold. The
Twin-Turbo is also being installed in
the all-new 2014 CTS Vsport, where
it provides an SAE-certifed 420
hp.—GSV