The Turbocharged Intercooled Typhoon

Turbo & Hi-Tech Performance

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The Typhoon’s low, aggressive stance only hints at its overall capability. GMC’s latest entry into the “super” sport utility mar
ket produces 280 horsepower in bone-stock form, with a few more on tap from some aftermarket performance shops. The
upgraded uJimmy S. 15 version of the hard hitting Syclone is sure to please serious performance enthusiasts. There are
some mid-to-low 12 second Syclones out there now, but it is only a matter of time time before everyday il’s are a reality with
both GMC turbo all-wheel drive packages. Who knows? With some serious modifications, we might even see quarter mile
times in the 9’s before too long!
When GMC says “It’s not just a truck
anymore,” they really mean it. The
Typhoon, their second entry into the
field of limited production “super
trucks,” features the same engine/chassis
combination as the Syclone, released earher
this year (Turbo March ’91).
The turbocharged/intercooled 4.3-
liter Vortech V-6 engine with multi-port
fuel injection puts out 280 horsepower at
only 4,400 rpm and a whopping 350
lbs/ft of torque at 3,600 rpm.
For acceleration enthusiasts, the
Syclone is able to run in the low-13’s right
off the showroom floor and clock-off zero
to 60 times under five seconds. Although
the Typhoon “Jimmy” is 200 pounds
heavier than the Syclone truck we expect
virtually parallel performance.
The Typhoon and Syclone compare
the closest to the Buick Grand National,
one of the most significant domestic
turbo vehicles built. The turbo Buick
boasted 245 horsepower in 1987 and
would run realistic low-14’s/high 13’s
right off the showroom floor.
The introduction earlier this year of
the GMC Syclone attracted serious attention,
particularly from the hard core
devotees of the ever popular Grand
Nationals.
Even now, four years after the final
Grand National rolled off the assembly
line, it still commands attention from the
hard core enthusiasts, as evidenced by the
feature on the Buick Club Nationals held
40 TURBO/ NOVEMBER 1991
at Bowling Green
featured in this issue. hh1L
It’s no secret that the
small and mid-size truck
market is one of the hottest
things going. But is it hot
enough to lure Grand
National owners past and
present (part of the
audience to whom GMC
was targeting the Syclone) …
away from style, luxury
and a back seat? Many of .:L;ffl:: :.
••
these Grand National
enthusiasts were thrilled
about the performance of The Syclone
the truck but, not sure the y 280 horsepoi
This combine
wanted to give up the (35% front6
comfort of a vehicle that second quarl
seats four. the quickest;
Enter the Typhoon. It –
has the speed of the Syclone with an
upgraded four-passenger interior, dark
charcoal leather seats with inflatable
lumbar supports, a leather wrapped
steering wheel and a myriad of other
goodies.
Although it is slightly heavier than
the Syclone, the Typhoon does offer more
in the way of the creature comforts. This
alone could lure some of the more mature
Grand National owners out of their
current ride.
Features include a stereo with graphic
equalizer, all of the power and remote
goodies, including a keyless remote entry
system for both the doors and tail gate.
They even remembered the “toys” that
require 12-volt power and included an extra
cigarette lighter to accommodate two “plug
in” accessories at the same
. time.
– -_.-• . -..– .- -.—
-.–.-,-.– –
inspired turbocharged/intercooled Vortech V-6
6’er at 4,400 rpm and 350 lbs/ft of torque at 3,
?d with the traction of a viscous coupled all-wh
% rear) gives sub-five second zero-60 times ar
er mile times in stock form, making the Typhoo
roduction vehicles made in America today.
those capabilities).
Even more impressive than the brute
power and swift acceleration is the superior
handling at virtually any speed. We’ve seen
all-wheel drive before; the Dodge Stealth
RT, Eagle Talon TSi and most recently the
How about 13=second
quarter miles, .82 on the
skidpad and 67 cubic feet
of storage space?
Subaru Legacy (all featured in Turbo) have
it, so we’re well aware of its many
redeeming qualities. With the Typhoon,
high speed handling on good pavement
shows a noticeable improvement, but
when the weather turns bad the difference
is amazing.
During the press
announcement we were able
to utilize a closed course to
get an idea of some of these
handling capabilities. All we
can say is that “impressive” is
a fitting word.
Skidpad testing of the
stock Syclone has shown a
.82 capability. We are
currently working with
Suspension Techniques and
Turbo City on a project
Syclone that should give
some flat impressive lap
produces times on a road course.
00 rpm. At the time of this
?el drive
idlowl3 writing, the Typhoon is
n one of scheduled for release in the
fall of’91.
We feel that with its
combination of drag strip ready
performance, sports car handling and
luxury appointments it will immediately
target its own specialized audience. In our
opinion, the Typhoon will outsell the
Syclone due to the room and
convenience of the “Jimmy”
configuration.
By now many of the performance shops
that specialize in Buick afteimarket products
have purchased and are in the process of
testing the Syclone to see just how much
performance can be reliably and, even more
rnljx)ltant, legally obtained.
We have already beard from both Kenne
Bell and Turbo City that the stock pistons do
not like more than 17 psi boost without
additional fuelflirning modifications.
For drag mcing, both Compucar and NOS
have announced nitrous oxide
1′ injection kits for the Syclone that
bring them off the line like a
slingshot, and have already seen
low- 12 second times on otheiwise
stock vehicles.
, w.*. • Many of these same
companies woked with us bk in
early 1986 when the Buick

-•.-.: performance programs were
getting started, so there seems to
be a certain amount of &já vu.
The only difference
here is that these shops are now
better educated in electronics and
fuel injection tuning, meaning
; yielded
g a tight
we should see even a faster
__
phoon ‘s evolution of performance for the
iced and Syclone and Typhoon than we
saw with the Buicks. A . AL
TURBO! NOVEMBER 199141]