Rare Car Archive

Makes › Yamaha Japan › OX99-11 · Prototype · Visionary project Ultra Rare

Yamaha
OX99-11

A road-going supercar with a 3.5-litre V12 developed by Yamaha's subsidiary Ypsilon Technology, of which three prototypes were built before the project was set aside.

Still being researched: identification guide, full specifications. Everything shown is checked against the cited sources. Know more? Send us a source.

Yamaha OX99-11 (Wikimedia Commons search)
Yamaha OX99-11 (Wikimedia Commons search)
Photo: Morio · CC BY-SA 3.0
3BuiltIndependently researched
0Chassis documentedin this archive
?SurvivingNot yet verified
Contents
  1. 01Overview
  2. 02Production & history
  3. 03Specifications
  4. 04Colours & options
  5. 05Individual cars
  6. 06Reference

01Overview

At a glance

Built
3 Built
Years
Not yet verified
Engine
V12, naturally aspirated · 3,500 cc / 3.5 LFactory: 3.5 L
Power
328 kW / 446 PSFactory: 440 hp · converted
Top speed
Not yet verified
Body
Not yet verified
Designer
Not yet verified
In this archive
Not yet verified
Surviving
Not yet verified

Sources and any conflicting figures are in the sections below.

Why it matters

The OX99-11 was an attempt by the motorcycle maker Yamaha to build its own road supercar, following its entry into Formula One as an engine supplier. Its tall, narrow one-plus-one cockpit reflected Yamaha's motorcycle background. Three prototypes were completed and the project did not proceed to sale.

How rare is it?

Six separate kinds of rarity – never combined into one number.

Model rarityUltra Rare 3 · Built1
Specification rarityNot yet assessed
Colour rarityNot yet assessed
Individual rarityNot yet assessed
Historical rarityNot yet assessed
Survival rarityNot yet assessed

Each kind of rarity is rated separately and never combined.

Photos

Exterior, interior and detail photos with their licences.

02Production & history

Production

Every figure says what it counts.

What is countedFigureBasisStatus
Total model productionprototypes built; the car did not go into series production 31 Factory production Independently researched

Independent counts (e.g. engine and colour) are never combined into a calculated figure. Surviving examples are never presented as original production.

History

The car was made by Ypsilon Technology, a Yamaha subsidiary, a few years after Yamaha entered Formula One as an engine supplier. Yamaha first approached a German company to build the car, then turned to the English engineering consultancy IAD. After disagreements, the project moved exclusively to Ypsilon Technology.

Poor financial conditions in Japan made it impossible to build and sell the car, and only three prototypes were made.

Variants

How each version differs from the standard OX99-11.

No variants documented yet. Have a source? Contribute it.

03Specifications

Technical specifications

Engine

Engine familyNot yet verified
Engine codeNot yet verified
LayoutV12, naturally aspirated2 Independently researched
Displacement 3,500 cc / 3.5 LFactory: 3.5 L2 Independently researched
BoreNot yet verified
StrokeNot yet verified
Compression ratioNot yet verified
Fuel systemNot yet verified
Power 328 kW / 446 PSFactory: 440 hp · converted2 Independently researched
Power atNot yet verified
TorqueNot yet verified
Redline 10,000 rpm2 Independently researched

Transmission & drivetrain

GearboxSix-speed manual, rear-wheel drive2 Independently researched
GearsNot yet verified
Driven wheelsrear2 Independently researched

Chassis, body & dimensions

ChassisNot yet verified
Front suspensionNot yet verified
Rear suspensionNot yet verified
BrakesNot yet verified
SteeringNot yet verified
Body constructionNot yet verified
WheelbaseNot yet verified
LengthNot yet verified
WidthNot yet verified
HeightNot yet verified
Front trackNot yet verified
Rear trackNot yet verified
Kerb weight 1,150 kgFactory: 1,150 kg2 Independently researched
Dry weightNot yet verified

Performance

Maximum speedNot yet verified
0–100 km/hNot yet verified
Fuel tankNot yet verified

“Not yet verified” means no source has been checked for that value yet. Nothing is estimated to fill a gap.

04Colours & options

Factory colours & interiors

Original paint and trim, with the number of cars in each where a source gives it.

Not yet documented. Have a source? Contribute it.

Factory options & codes

Codes are shown exactly as written by the manufacturer.

Not yet documented. Have a source? Contribute it.

05Individual cars

Chassis register

Every documented car, with its colours, history and where it is now. Open a row for the full record. Known chassis are not automatically authenticated originals.

Not yet documented. Have a source? Contribute it.

Competition history

Every race result of the individual cars, in date order. Click a chassis number to open its full record in the register.

Not yet documented. Have a source? Contribute it.

Auction & sale history

Documented public sales of the individual cars. Click a chassis number to open its full record in the register.

Not yet documented. Have a source? Contribute it.

See one in person

Museums where an example of this car can be seen.

No example is documented on public display yet. Have a source? Contribute it.

06Reference

Identification guide

How to tell an original from a replica or later conversion.

Not yet documented. Have a source? Contribute it.

Sources

Each number links to the exact facts it supports.

  1. 1
    Rare Yamaha OX99-11 Is The F1-Powered Supercar You (Probably) Didn't Know Existed Level C
    • 3 prototypes built; the car did not go into series production
    Accessed 2026-11-13
  2. 2
    Rare Yamaha OX99-11 Is The F1-Powered Supercar You (Probably) Didn't Know Existed Level C Carscoops · 2019-05
    • 3.5-liter naturally-aspirated V12 engine
    • 3.5-liter naturally-aspirated V12
    • pumping out 440 hp
    • revving to a dizzying 10,000 rpm
    • six-speed manual transmission driving the rear wheels
    • weighs just 1150 kg (2535 lbs)
    Accessed 2026-11-13

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