1-15-09

Current status: Blew a head gasket and cracked the number 1 piston. Motor is out and sitting on a stand...

What is a Typhoon

Built by PAS (Production Automotive Services - Troy, MI, also built the 89 TTA), the Syclone, Typhoon, and S-GT had the distinction of being the quickest production trucks ever to roll off the assemly line.

Both the Syclone and Typhoon utilize a 4.3L Turbocharged Vortec V6, pushing out 285+ HP (disputed to be 330) with 360ft/lbs of torque, with a liquid-cooled intercooler. A multiport fuel system feeds the motor while a TH700R4 automatic transmission puts power down to the AWD drivetrain. 0-60 times range from under 5 seconds (even in the rain!) to a quarter mile time of low/high 13's for the Syclone and mid 13's to low 14's for the Typhoon in stock form. The Syclone's ONLY production year was in 1991 with an estimated 2995 units built, while the Typhoon lasted from 1992-93 with 2500 units built in 92 and 2200 units built in 93. Both trucks feature a specialized ground effects package (known as cladding) and turbine style 16x8 aluminum rims. The Syclone's interior features plush cloth bucket seats with the "Syclone" badge embroidered into the headrest, along with door inserts to match while the 92 Typhoon's feature leather/cloth seats with headrest "Typhoon"embroidery and the 93 features full leather interior with power seats and overhead console. The trucks feature center console holds the leather shifter while a gauge cluster from a Sunbird GT keeps you informed of engine vitals and boost.

The 4.3L Syclone and Typhoon engine uses most major components of the production LB4 engine. Standard production parts include the cylinder block (except bearing caps), camshaft, crankshaft, connecting rods, cylinder heads and valve train. The parts unique to the Syclone and Typhoon base engine include the pistons, head gaskets, upper and lower intake manifolds and gaskets, fuel rail, port fuel injectors, exhaust manifolds, exhaust crossover pipe, turbocharger, charge air cooler, and various brackets, hoses and pipes. The throttle body is from a 5.7L port injected engine. The SyTy Motor produces an estimated 280hp at 4600rpm with 360ft/lbs of torque at 3600rpm. While these numbers are somewhat accurate, stock form trucks have been know to register 300+hp and 400+ft/lbs of torque on dynos.

Page 1-Truck Pics, Transmissions, New engine going in
Page 2-New wheels
Page 3-Bettery relocation, gauges, trans cooler
Page 4-Old parts from roadmaster trans
Page 5-Meets
Page 6-Time slips and Video

Before

After

New engine from RPM Motors,Vortec Heads, PTE TE60 Turbo w/ RPM DP, RPM A/A intercooler

Stock trans....Dr. Evil....both gone

The Roadmaster/Dr. Evil 700r4 trans has since been replaced with a prime gears/George Blake 4l80e. Note. ROADMASTER TRANS LASTED LESS THEN 500 MILES see page 4

Goin in