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1984 X100 Lotus Prototype

  • Private or Trade: Private seller
  • Mileage: 1250
  • Town/City: Houston
  • Post Code/Zip: 77586
  • Country: United States
  • Listed: October 9, 2018 7:44 pm
  • Expires: 19 days, 21 hours
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1984 Lotus X100 one of a kind prototype. Fully restored, with 1,250 indicated miles. Probably the only Lotus prototype existing outside the Lotus factory; and most certainly the only one that’s street legal (Texas title and registration).

This is the last road car project designed under company founder, Colin Chapman. When he died in 1982, the project stalled as Lotus found itself in financial trouble. David Wickens, of British Car Auctions, ended up taking a controlling interest in the company, and the project was started up again under the code name, X100. After redesigning the car to be a convertible, the go ahead was given in 1984 to make a single prototype.

Lotus followed their successful Lotus design formula: start with a steel backbone chassis, drop in a donor power plant (tweaked of course), add one fiberglass body, and all the while, keep the weight to a minimum (it’s under 2000 lbs). Follow it up with extensive track testing and suspension development at the factory, and there’s no question it is worthy of the Lotus badge. Having owned an example of just about every Lotus model over the years, it (not surprisingly) drives and handles most like the Elan – the car it was intended to replace. Unlike the Elan however, fuel injection means it starts when expected and no fiddling with carburetors

The X100 was built as a complete production-ready car from fully developed molds, with functional lights, wipers, brakes, suspension, etc.. It even has a jack and owner’s manual. For the power plant, Lotus sourced a Toyota 4AGE drive train, as used in the 1984 Corolla GT, with a Toyota 5 speed manual transmission.

This car is prominently featured in the book, A Life in Car Design, by its Chief Designer, Oliver Winterbottom (2 full chapters with numerous photos and drawings).

Everything works and the car is in show-ready condition. Minor blemishes include a small scratch inside the driver’s door jam, small tears and stains on the convertible top, and a small stain on the carpet in the driver’s footwell. The tires have less than 50 miles, but should be replaced due to age. As can be seen in the pictures, the car is right hand drive, and has a tiny back seat. See below for technical specifications.

Sale includes spare parts and extensive documentation including restoration log book and photos, original sales brochure, photos of the car at the Lotus factory as well as at Toyota factory in Japan, import paperwork, etc. Sold as-is by an individual, not a dealer. Payment accepted: cash or cashier’s check (no PayPal).

Vehicle is available for immediate pickup, or just drive it home! I can assist with shipping arrangements.

Additional information

Powder coated frame

All interior and seat upholstery is new

All lights, wipers, turn and hazard lights work

All instruments, warning lights and gauges work

Suspension is based on Lotus Excel

Stainless steel exhaust and fuel tank

Custom fit indoor car cover in fair condition

Driver and passenger side door windows are light weight, bespoke polycarbonate with scratch-resistant coating as used in race cars. Electric window function is maintained. The original laminated door glass windows are included in the sale, but are severely cracked and barely hold their shape.

Future stereo –There is a DIN radio cutout behind the commemorative plaque. Car is prewired for a stereo with power, speaker wire to the doors, and connection to the (working) power antenna.

Future AC – Air conditioning is not installed, but could be added as there is room for all the components and dashboard controls are existing. A new compressor (uninstalled) is included. Will need to buy/install an evaporator and housing, evaporator fan, hoses, and wiring.

Technical Specifications:

Wheelbase (at design mid laden) is 2308 mm (90.86 inches). Mid laden is half way between bump and rebound.

Suspension at mid laden:


Front toe in 3.2 mm
Camber 0.5 degree negative
Castor 4.0 deg
King Pin inclination 9.5 deg
King pin ground offset 48 mm
Anti dive 40%
Roll centre height 26 mm


Toe in 4 mm
Camber angle 0.5 deg
Anti squat 0%
Roll centre height 50.8 mm


2.9 turns lock – lock

Turn circle kerb – kerb 28.5 feet
Ackermann 29 deg – 31 deg full lock positive

Fuel tank 12 gallons

Max engine speed 7600 rpm

Max power 123 bhp at 6600 rpm

Max torque 104.5 pounds feet (DIN) at 5200 rpm

Front track 1440 mm

Rear Track 1460 mm

Overall length 3921 mm

Width 1698 mm

Height 1187 mm

Ground clearance 130 mm (below exhaust system)

Kerb weight 895 Kg


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Listing ID: 1025bbd045f0015d

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