International SyTy Registry

GMC Syclone, Typhoon, & Sonoma GT History and Data

GMC Syclone & Typhoon Specifications

90° 4.3L V-6 Cast Iron Block & Heads Turbocharged & Intercooled

  • RPO: LB4
  • Bore & Stroke: 4.00 X 3.48 In., 101.6 X 88.4mm
  • Displacment: 262 cu. in., 4300cc, 4.3L
  • Compression Ratio: 8.35:1
  • Valvetrain: OHV – 2 valves per cylinder, 1.5 rockers, pushrods, hydraulic lifters
  • Turbocharger: Mitsubishi TDO-6 – 17c/8cm2 with integral wastegate
  • Intercooler: Garrett 13 PSI Water/Air closed system

Rated Horsepower: 285 bhp @ 4400 rpm / Redline 4800RPM
Rated Torque: 350lb-ft @ 3200 rpm

4 Spd Auto 700-R4 w/ Lockup Torque Converter

  • TCC Stall Speed: 2100 RPM
  • Gear Ratios: 
    • 1st 3.06
    • 2nd 1.63
    • 3rd 1.00
    • 4th 0.70
  • Final Drive Ratio: 3.42:1 (limited slip rear axle)
  • Drivetrain: All Wheel Drive (AWD)
  • Transfer Case: Borg Warner BW-4472
  • Transfer Gear Ratio: 1.00:1
  • Torque Split: 35% front, 65% rear
  • Torque Bias: Viscous Coupling
  • Front Sway Bar: 1.26″ Diameter
  • Front Suspension: Independent Unequal Length Control Arms, Torsion bars, Anti-Roll Bar
  • Rear Suspension: Live Axle, Semi-Elliptic, Single-Stage, Multi-Leaf Springs
    • Electronic Air Level Control – Typhoon ONLY
  • Steering: Integral Power, Reciculating Ball, Power Assisted
  • Turns Lock-to-Lock: 3.1
  • Turning Radius: Curb to Curb – 35.4 Ft.
WHEELS
  • Wheel Size: 16.0″ X 8.0″
  • Bolt Pattern: 5″ X 4.75″ (120.65mm)
  • Wheel Offsets: Front 41mm  /   Rear 13mm
  • Stud Size: M10.9 12 x 1.50 @ 1-3/4″ long
  • Stock Tire: Firestone Firehawk SVX, P245/50VR-16 M+S (no longer in production)
BRAKES
  • Front Brakes: 10.5″ X 1.03″ Vented Disk with a minimum rotor thickness of .980″
  • Rear Brakes: 9.5″ X 2″ Cast Iron Drums with a maximum drum diameter of 9.560″
  • Power Assist: Vacuum, W/4 Wheel Anti-Lock
SYCLONE
  • Wheelbase: 108.3 in (2,751 mm)
  • Length: 180.5 in (4,585 mm)
  • Width: 64.8 in (1,646 mm)
  • Height: 60.0 in (1,524 mm)
  • Curb Weight: 3550 lbs
TYPHOON
  • Wheelbase: 100.5 in (2553 mm)
  • Length: 170.3 in (4326 mm)
  • Width: 68.2 in (1732 mm)
  • Height: 60.0 in (1524 mm)
  • Curb Weight: 3822 lb (1734 kg)

Sonoma GT Specifications

90° 4.3L V-6 Cast Iron Block & Heads

  • RPO: LB4
  • Bore & Stroke: 4.00 X 3.48 In., 101.6 X 88.4mm
  • Displacment: 262 cu. in., 4300cc, 4.3L
  • Valvetrain: OHV – 2 valves per cylinder, 1.5 rockers, pushrods, hydraulic lifters

Rated Horsepower: 195 bhp @ 4500 rpm
Rated Torque: 135 lb-ft @ 3200 rpm

4 Spd Auto 4L60

  • Drivetrain: Rear Wheel Drive (RWD)
  • Wheelbase: 97 in
  • Length: 175 in
  • Width: 64.7 in
  • Height: 61.3 in
  • Curb Weight: 3314 lbs (1503 kg)