928 S4/GT (1987 - 1991)

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

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