Ultima GTR Buyer’s Guide (1999-2015): Specs, Prices, Tips

The Ultima GTR stands out as one of the most exhilarating kit cars ever produced, blending raw power, lightweight construction, and track-proven engineering into a road-legal package. Launched in 1999 by Ultima Sports, this British creation drew from decades of racing heritage to deliver supercar performance at a fraction of the cost of factory-built rivals. Available as a self-assembly kit or fully constructed vehicle, it catered to enthusiasts who craved customization alongside blistering acceleration and record-setting lap times.

Origins and Design Philosophy

Ultima Sports, founded by Warren Hayes and later refined under designers like Lee Noble and Ted Marlow, approached supercar building unconventionally. Unlike traditional manufacturers, Ultima focused on a modular chassis that integrated high-quality off-the-shelf components, primarily from Chevrolet for engines and Porsche for transmissions. This strategy kept costs down while enabling power outputs from 350bhp to over 1000bhp, making the GTR faster than contemporaries like the McLaren F1 in straight-line speed.

The GTR’s body utilized unpainted gel-coat fiberglass reinforced plastic (GRP) for an ultra-lightweight shell weighing around 990kg fully built. Aerodynamics were prioritized during development, with wind tunnel testing at MIRA confirming exceptional balance for speeds exceeding 200mph. Features like seamless panel gaps, integrated electric mirrors, and a triple-headlight setup contributed to its production-car refinement, despite its kit origins.

Powertrain and Customization Options

At the heart of every Ultima GTR is a small-block Chevrolet V8, typically sourced from the LS1 or larger variants. Standard tunes delivered 345bhp and 350lb ft of torque, but supercharged or twin-turbo setups pushed boundaries to 800bhp or more. Gearboxes were robust six-speed units from Porsche or Getrag, paired with a transaxle layout for optimal weight distribution.

• Engine Choices: Factory-recommended Chevy V8s with Edelbrock injection; custom builds common among owners.
• Power Range: 330bhp entry-level to 1000bhp extremes by late production.
• Transmission: 5- or 6-speed manuals; rear-wheel drive with limited-slip differential.

Suspension was fully adjustable for track or road use, featuring double-wishbone fronts and a multi-link rear. Brakes, often AP Racing units, provided supercar-level stopping power, with the GTR holding world records for deceleration.

Performance Benchmarks

The Ultima GTR redefined acceleration benchmarks. A standard 2000 model with 345bhp Chevrolet V8 hit 0-60mph in 3.3 seconds, reached 157mph top speed, and covered a quarter-mile in around 10 seconds. Higher-tune versions shaved 0-60 times to 2.6 seconds and exceeded 200mph.

Track records abound: multiple world speed records and lap times that humbled factory supercars. Its lightweight chassis and power-to-weight ratio of under 1000kg made it a benchmark for kit car performance.

Evolution Across Production Years

Production spanned 1999 to 2015, evolving subtly to meet regulations and owner demands.

• 1999 Launch: Debut with Chevy V8s from 330-600bhp; Can-Am open-top variant introduced shortly after.
• Early 2000s: Refinements like improved rear styling and headlamps; power ceiling raised to 1000bhp.
• 2008: Optional quieter exhaust for track noise compliance.
• 2015: Phased out for the Ultima Evolution Coupe, but spares remain available.

The Can-Am Spyder added roadster appeal without sacrificing performance, sharing the same chassis and powertrains.

Interior Comfort and Everyday Usability

Despite its track focus, the GTR included road-friendly luxuries: air conditioning, leather/Alcantara seats, Ultima-branded gauges, and a laminated glass windshield. Some owners added stereos, but the cockpit prioritized driver engagement with a purposeful layout.

Ride height and damping could be softened for street driving, though its stiff setup favored circuits. Fuel economy hovered around 15-20mpg, practical for occasional use.

Current Market Values and Pricing Trends

As of 2026, Ultima GTR values reflect rarity and condition. Median prices sit at £47,544, with lows at £36,000 and highs up to £63,058. Sell-through rates are strong at 78%, indicating demand.

• Kit Cars: £30,000-£45,000 (unbuilt or partial).
• Built Road-Legal: £45,000-£60,000 (standard power).
• High-Spec Track Cars: £60,000+ (supercharged, low miles).

Low depreciation rewards long-term ownership, especially for well-maintained examples.

Key Ownership Costs and Maintenance

Running a GTR is affordable compared to supercars. Chevy parts are ubiquitous and cheap; Ultima supplies chassis-specific components with repair services, including collection/delivery.

Expect 12-month warranties on new builds; older cars benefit from factory backing.

Common Issues and Inspection Checklist

The GTR is robust, but proactive checks prevent headaches.

• Engine Heat: Supercharged units run hot; inspect cooling systems for hard-driven cars.
• Electrics: Verify switches, lights, and wiring; simple but prone to age-related faults.
• Chassis/Body: Check gel-coat cracks, panel alignment; rust rare due to composites.
• Suspension: Worn bushings from track abuse; test for play.
• Gearbox: Porsche units durable; listen for unusual noises.

Service history is crucial; favor cars with Ultima-maintained records.

Buying Tips for Prospective Owners

Approach purchases methodically:

1. Verify Provenance: Factory number, build logs, and engine matching.
2. Test Drive Thoroughly: Full throttle, braking, and high-speed stability.
3. Professional Inspection: Ultima specialist or independent engineer.
4. Budget for Upgrades: Modern safety tech or EFI conversions.
5. Kit vs Built: Kits save money but require skills/time.

Join owner forums for real-world insights; track days showcase its prowess.

Track Dominance and Record Legacy

The GTR’s halo is its track pedigree: quickest 0-60 and braking times ever recorded, plus lap records at circuits worldwide. Owners report sub-1:20 Nürburgring laps in tuned spec, rivaling Le Mans prototypes.

Alternatives Comparison

The GTR excels in outright pace and comfort over lighter, less powerful kits.

FAQs

Is the Ultima GTR road legal?

Yes, fully homologated in the UK and export markets with lights, AC, and seats.

How reliable is the Chevrolet engine?

Highly reliable with maintenance; small-block V8s are proven in millions of vehicles.

Can I build it myself?

Kits include all parts except engine; average build time 200-300 hours for experienced builders.

What’s the best model year?

Post-2000 for refinements; avoid early kits without updates.

Are parts still available?

Yes, Ultima provides spares; Chevy components widely accessible.