1993 Porsche 964 Turbo S Slantnose X83

One of 10 Turbo S, the rarest of them all.  


964 Turbo S Slantnose X 83

Chassis nO.


Engine Number


Gearbox Number


Color Code

A8 Polar Metallic Silver


3.600 cc


385 BHP



Year                  1993

Make               Porsche

Model              964 Turbo S Slantnose X83

Chassis No.    WPOZZZ96ZRS-----

Engine No.     61R00---

Gearbox No.  2003---


The Japan model features the 930 Turbo S/944 style front end with pop up type headlights, 930 style rear quarter vents and boxed rockers.  The cars are all LHD, Polar Silver Metallic and feature the exact same build code specification.  Four cars were delivered with the 3.8 RS rear spoiler and six with the standard 3.6 Turbo rear spoiler.  At ten build the 964 ‘Flatnose’, it is one of the rarest production Porsche’s of all time.

In addition to the “Flatnose type Fenders with front wheel housing vents” the Japan car features the following differences to the ROW and USA cars:

  • Air inlet ducts with lands at rear fenders
  • XD 7 Tower cross brace (against surcharge)
  • Z application 1637 – bucket seats as on 911 Carrera RS
  • No backrest and seat belts in rear
  • Roof antenna as on model 928

The cars by VIN #

470222, 470285, 470291, 470311, 470326, 470335, 470344, 470362, 470386, 470388

Production and Delivery data

Earliest completed production date          November 16,1993 (VIN 470285)

Latest completed production date            January 12, 1994 (VIN 470344)

Earliest vehicle delivery date                     April 1, 1994 (VIV 470326)

Latest vehicle delivery date                       November 27, 1995 (VIN 470285)

Exterior color and country of delivery

Polar Silver Metallic                                  10

Japan                                                          10

Fact, Rumors and Myths,

  • The base sticker price was 25.400.000 yen with the 3.8 RS rear spoiler and 25.500.000 yen with the standard 3.6 rear spoiler
  • At least one unidentified Flatnose has been crashed (destroyed?)
  • VIN 470285 was the very last Flatnose car to be delivered on November 27, 1995



A key feature of the Flatnose and Package cars was the M64/50 S engine – the X88 “Sport Tuning” option.  According to the factory, 155 X88 option engines were built.  Ninety-three of these engines went into the “Turbo S” cars, 51 engines were installed in standard 3.6 Turbo models as special order option “X88” and 11 engines are unaccounted for.  These were probably sold to customers for race applications such as the Turbo 3.6 IMSA.

The “S” designation is denoted by an understated punch stamp.

The M94/50S engine obtained its increased power from specially modified cylinder heads with different than standard inlet and exhaust ports, upgraded camshafts, modified timing gearwheel and the K27 7006 turbo charger (the K27 7006 has a lager hot side than the K27 7200 in the standard 3.6 Turbo which makes for an 300 rpm later boost onset but lover back pressure in the exhaust manifold and increases efficiency so that it makes more HP).  Valve timing was advanced from standard for more overlap and richer mixture.  Maximum boot pressure was .79 to .85 bar the same as the standard 3.6 turbo engine (although the onboard computerized boost gauge only reads to 0.7 bar as described in factory technical bulletin “9032-9307”.

The following information on the 911 3.6 liter – engine with increased output – K88 is from the factory technical bulletin “Xe”.

Engine with increased output – X88

Part n°                       part designation

964.105.247.08       camshaft left hand

964.105.246.19       camshaft right hand

911.105.171.02       spacer flange for LH camshaft

900.067.282.02       bolt

930.113.025.03       gearwheel

930.100.908.03       gasket set

930.123.003.03       turbocharger

930.123.121.06       turbocharger bracket

964.104.033.22       cylinder head

930.110.141.04       flange

930.130.034.05       inlet manifold

Engine – X88 – M64/50 S

Displacement         3.600 cc

Output                    283 kw (385 HP) at 5.750 rpm

Torque                    520 (53 kpm) at 5.000 rpm

Scoop of modifications to M64/50 S engine

Cylinder head intake & exhaust ports manifold

Inlet manifold and spacer flanges manifold

Modified camshafts

New turbocharger

Turbocharger bracket

Valve timing 1.26 +.01 mm (inlet valve stroke in overlapping TDC)

The specification of car WPOZZZ96ZRS-----

Last know location              California, import from Japan by Mr. D. Mohlman

Last know condition            Intact

Finished production date    25.11.1993

Retail delivery date              26.07.1995

Delivery country                  Japan

Shipped to Dealer                Mizwa Motors

MSRP                                    unknown

Exterior color                       Polar Silver metallic

Interior color                        Black full leather

Engine number                     61R000---

Transmission number           2003---

Drive type                             LHD

Vehicle options


130               labeling in English

193               version for Japan

197               88 Ah battery

220               locking differential (40 %)

235               ---

288               headlight washer

323               sticker, without ESE-regulations

407               18 “ polished wheels

423               cassette container and coin box

425               rear wiper

434               work instructions for cars overseas (924 and 944)

441               fader, antenna booster, 4 speakers

455               wheel locks

481               5-speed manual transmission

492               H4 headlights for left hand traffic

494               2 speakers on back shelf

498               without rear model designation

534               ---

562               airbag driver’s side

567               windshield green graduated tint

573               air-conditioner

605               vertical headlight adjustment

650               sunroof

657               power steering

659               on board computer Carrera 2

912               vehicle without identification plat

975               velour carpet in luggage compartment

981               all leather lining

36S               ----