Westfield Megabusa: 0-60 In 3.4s, Superbike-Powered Track Review

The Westfield Megabusa stands out as a pure distillation of driving excitement, blending the minimalist ethos of classic British roadsters with modern superbike power. This open-top convertible delivers **supercar-level acceleration** from a fraction of the price, making it a dream for enthusiasts seeking raw performance without compromise.

Origins and Design Philosophy

Westfield has long drawn inspiration from the iconic Lotus Seven, crafting lightweight chassis that prioritize agility over luxury. The Megabusa takes this further by integrating a high-revving motorcycle engine, transforming it into a track weapon disguised as a road car. Its **fabric convertible roof** offers basic weather protection, but the real appeal lies in its doorless, windscreen-free design that channels wind directly into the cockpit for an immersive experience.

Built around a tubular steel spaceframe with fiberglass body panels, the Megabusa weighs just **420kg**, enabling explosive performance. Dimensions include a compact wheelbase of 2413mm, length of 3340mm, and tracks of 1448mm front and 1422mm rear, ensuring nimble handling on twisty roads or circuits.

Powertrain: Hayabusa Heart

At the core is the legendary **Suzuki GSX-R1300 Hayabusa inline-four engine**, displacing 1299cc with DOHC valvetrain, 81mm bore, 63mm stroke, and 11.0:1 compression. It pumps out **175-180bhp at 9800rpm** and 138Nm of torque, propelling the featherweight chassis to **0-60mph in 3.4 seconds**, 0-100mph in over 7 seconds, and a **top speed of 142mph**.

Paired with a **6-speed sequential gearbox** and Quaife differential, power flows to the rear wheels efficiently. Gear ratios start at 2.769:1 with a 3.51:1 final drive, optimized for rapid shifts and track use. Unlike traditional car engines, the Hayabusa’s high-revving nature (redline near 11,000rpm) delivers a scream that rivals superbikes, with specific output exceeding 134bhp per liter.

Chassis and Handling Dynamics

The Megabusa’s suspension features competition-grade adjustable dampers, delivering a firm ride ideal for track days but punishing on daily roads. **AP Racing vented front discs** provide immense stopping power, augmented by a modified clutch for seamless launches. Tires are 185/60ZR13 front and 205/60ZR13 rear on 13-inch wheels (7-inch front, 8-inch rear), gripping fiercely in corners.

Steering is razor-sharp with quick rack-and-pinion setup, making it feel more like a go-kart than a car. Rear-wheel drive with limited-slip diff ensures predictable oversteer, rewarding skilled drivers with tail-happy slides. Its low center of gravity and minimal mass make it slay heavier supercars on winding B-roads.

Interior and Everyday Usability

Expect spartan surroundings: basic bucket seats, minimal gauges, and exposed mechanicals. Luggage space is negligible, and the fabric roof folds manually for open-air blasts. Noise, vibration, and weather exposure demand commitment—it’s a **weekend toy**, not a daily driver. Build quality prioritizes function over finesse, with some reports noting rough edges.

• Pros: Insane power-to-weight, addictive handling, affordable thrills
• Cons: Zero practicality, harsh ride, basic refinement

Purchase and Build Costs

Originally priced from **£16,000**, used examples remain bargains for the performance. Self-build kits appeal to DIY enthusiasts, though professional assembly ensures reliability. Maintenance favors motorcycle specialists due to the Hayabusa powerplant—parts are plentiful and cheaper than car equivalents.

Running costs are low with efficient fuel use at cruise speeds, but track abuse demands frequent upkeep. Insurance can be steep for novices; mandatory training courses teach safe handling of its extreme traits.

Track Performance and Racing Heritage

Westfield’s race team, highlighted by drivers like Richard Smith, showcases the Megabusa’s prowess. Modified with full race dampers and big brakes, it dominates club events. Its bike-engine responsiveness outpaces many purpose-built racers, with 180bhp feeling boundless in a 420kg package.

Owners rave about overtaking capability—even against motorcycles—thanks to superior downforce-free aero and traction. It’s a circuit scalpel, carving apexes with precision.

Comparisons with Rivals

Versus Lotus Seven derivatives or Caterham, the Megabusa edges in straight-line speed but trades refinement. Alternatives like Westfield Sport Turbo or SEiGHT V8 offer variety, but none match the Hayabusa’s visceral howl. For pure value, it trumps pricier exotics.

Owner Experiences and Modifications

Forum users highlight the Busa’s power edge over simpler bike engines, though alternatives cut costs without much speed loss. Common mods include dry sump oiling, upgraded exhausts for sharper response, and aero tweaks for stability. Reliability shines with proper tuning, but heat management is key in traffic.

One owner notes: it’s so engaging, you’d never return to a conventional sports car for fun.

Frequently Asked Questions (FAQs)

Is the Westfield Megabusa street-legal?

Yes, in most regions with proper registration, but check local noise and emissions rules. Training is recommended.

How reliable is the Hayabusa engine in a car?

Highly reliable with motorcycle-grade durability; routine servicing keeps it robust.

What’s the fuel economy?

Around 25-35mpg mixed, better on backroads than track.

Can beginners drive it?

No—its power demands experience; courses mitigate risks.

What’s the resale value?

Strong due to cult following; well-maintained units hold value.

Why Choose the Megabusa?

For adrenaline junkies, the Westfield Megabusa convertible redefines affordable performance. Its Hayabusa fury, featherweight build, and track-ready setup deliver unmatched thrills. Sacrifice comfort for speed, and join a passionate community of speed demons.