Our purpose is to support owners in their use and maintenance of the Porsche 928 and to foster camaraderie among owners throughout the world.

 

928 S4/GT (1987 - 1991)

928 S4/GT Dimensions 

Wheel base 98.43"
Track width front 61.06"
Track width rear 60.90"
Overall length 177.95"
Overall width 72.28"
 Height 50.47"
 Ground clearance 4.72"
 Turning circle 38.4'

 

 928-Hi38

  • 928-Hi25
  • 928-Hi26
  • 928-Hi27
  • 928-Hi28

928 S4 Changes/Upgrades by Model Year

 

1987 928 S4  VIN Range - WP0JB092_HS860001 - 2481

  • Base MSRP up to: $58,900
  • Power output increases to 316 bhp & 317 ft/lbs
  • Single engine in all 928s worldwide
  • New intake/induction system
  • Updated front and rear bumpers
  • New H4 headlights
  • Updated fog lights
  • Restyled rear tail lights
  • Rear wing spoiler
  • cooling flaps added in front of radiator to reduce drag
  • Early 928 S4s have folding rear spoiler (Eliminated after very early production)
  • Automatic shift program changed for second gear starts (hard acceleration starts will be in 1st gear)
  • Curb weight = 3,550(auto)/3,505(5-spd)
  • Wheels were 7x16 front and 8x16 rear flat disc with an offset of 65mm(front) and 52.3mm(rear) with 225/50 16(front) and 245/45 16(rear) tires
  • VIN tags on all body panels

 

1988 928 S4  VIN Range - WP0JB092_JS860001 - 1852

  • No changes

 

1989 928 S4/GT  VIN Range - WP0JB092_KS860001 - 1250

  • 1989 928 GT base MSRP to: $74,545 + $1,300 gas guzzler tax
  • 928 S4 automatic gets revised shift program (holds a gear longer when accelerator pedal is to the floor)
  • Break pad wear indicators
  • Radio antenna moved to roof
  • Computerized dash read out reports miles, outside air temp, gas mileage, trip odo, miles to empty......
  • 928 GT introduced as a late model year addition (It appears that the 928 S4 5M was still built during 89 GT production.  It is critical that claims of a 1989 928 GT be verified both visually and with option codes)
  • 1989 928 GT production begins in March 1989 and ends in June 1989
  • The earliest 1989 928 GT currently recorded has a VIN of 1107
  • 1989 928 GT power increased to 326 bhp & 317 ft/lbs
  • 1989 928 GT is differentiated from the 928 S4 in the following ways:
    • Rolled fender lips front and rear
    • Lightened twin outlet exhaust
    • Shorter shift lever
    • Different intake (same as GTS)
    • GT camshafts
    • 17 mm Rear wheel spacers
    • Short ratio manual transmission
    • Wheels were 8x16(front) and 9x16(rear) "club sport" with an offset of 60mm with 225/50 16(front) and 245/45 16(rear) tires
  • 1989 928 GT is further differentiated from the S4 by the following options (option codes are located on the inside cover of and original owners manual or on a white sticker located in the rear hatch area opposite the spare tire and above the gas tank):
    • 220 - 40% Limited Slip
    • 393 - Forged Alloy Wheels
    • 474 - Sport Suspension
    • 481 - 5-speed transmission
    • 639 - 1989 928 GT

 

1990 928 S4/GT  VIN Range - WP0JB092_LS860001 - 0581

  • Base MSRP up to: $74,545 + $1,300 gas guzzler tax
  • 928 GT(5-speed) power remains at 326 bhp & 317 ft/lbs while 928 S4(automatic) stays at 316 bhp & 317 ft/lbs
  • Dual airbags appear in the 928 for the first time
  • Tire pressure monitoring system (RDK)
  • 928s with 5-speed are now GTs
  • Design 90 style wheel introduced on the 928 (flat disk style wheels still available)
  • Electronically controlled limited-slip differential (PSD) on all models
  • Twin outlet muffler on both S4 and GT
  • Wheels were 7x16 front and 8x16 rear flat disc with an offset of 65mm(front) and 52.3mm(rear) with 225/50 16(front) and 245/45 16(rear) tires
  • Standard on 1990 and 1991 928 GTs and optional on S4s were 7x16(front) and 8x16(rear) "Design 90" style wheels with an offset of 65mm(front) and 52.3mm(rear) with 225/50 16(front) and 245/45 16(rear) tires
  • VIN tags on all body panels eliminated

 

1991 928 S4/GT  VIN Range - WP0AA292_MS810001 - 0448

  • Shorter more ergonomic shift lever in the 91 928 GT
  • Cooling flaps in front of radiator eliminated
  • Improved door seals to reduce water dripping on occupants during rainy weather
 

Model Year

Engine Size/Type

BHP/Torque

Compression Ratio

Final Drive Ratio

0-60

Top Speed

1987 928S4 - 4-speed Automatic 5.0L-32v M28/42 316/317 10.0:1 2.20 6.6 162
1987 928S4 - 5-speed Manual 5.0L-32v M28/41 316/317 10.0:1 2.20 6.0 165
1988 928S4 - 4-speed Automatic 5.0L-32v M28/42 316/317 10.0:1 2.20 6.6 162
1988 928S4 - 5-speed Manual 5.0L-32v M28/41 316/317 10.0:1 2.20 6.0 165
1989 928S4 - 4-speed Automatic 5.0L-32v M28/42 316/317 10.0:1 2.54 6.3 162
1989 928S4 - 5-speed Manual 5.0L-32v M28/41 316/317 10.0:1 2.64 6.0 165
1989 928GT - 5-speed Manual 5.0L-32v M28/47 326/317 10.0:1 2.73 5.8 171
1990 928S4 - 4-speed Automatic 5.0L-32v M28/42 316/317 10.0:1 2.54 6.3 165
1990 928GT - 5-speed Manual 5.0L-32v M28/47 326/317 10.0:1 2.73 5.8 171
1991 928S4 - 4-speed Automatic 5.0L-32v M28/42 316/317 10.0:1 2.54 6.3 165
1991 928GT - 5-speed Manual 5.0L-32v M28/47 326/317 10.0:1 2.73 5.8 171

Note:  Some of the information on this page came from www.928gt.com and www.928s4vr.com