Adding a 119mm Turbo to a Five-Rotor Supercar Is Stupid in a Good Way

Why It Matters

The larger turbo could unlock higher, more reliable power for rotary platforms, influencing future high‑performance engine designs. Demonstrating measurable gains also validates Mazzei’s data‑driven approach for niche automotive engineering.

Key Takeaways

• 119mm turbo adds ~30% airflow capacity.
• Goal: lower EGT, improve high‑rpm efficiency.
• New sensors monitor back‑pressure and boost loss.
• Turbo upgrade serves research, not just speed.
• Mazzei attracts tuning clients with extreme builds.

Pulse Analysis

The Mazzei Formula Five is a one‑off, five‑rotor rotary supercar that has become a benchmark for extreme engineering in the hobbyist world. Built on a Superlite SL‑C chassis, the car previously demonstrated 1,120 whp on a dyno using a 106 mm Garrett G57 turbo. Mazzei’s hands‑on approach blends custom fabrication with data‑driven tuning, turning the vehicle into a rolling laboratory for rotary technology. As the only street‑legal five‑rotor platform of its kind, its development offers rare insight into scaling rotary performance beyond conventional limits.

The new 119 mm turbo arrives with a cast housing and a proprietary “7+7 splitter blade,” increasing the turbine’s flow area by roughly 30 percent. This larger geometry allows more air mass to be compressed at the same boost, lowering exhaust gas temperatures and extending the power band past the 8,000 rpm ceiling where the smaller turbo stalled. Mazzei added a back‑pressure sensor on the exhaust manifold, a pre‑throttle‑body sensor to detect compressor surge, and a post‑intercooler boost gauge to capture pressure drops. Early data suggest a flatter torque curve and improved thermal efficiency.

Beyond sheer horsepower, the upgrade serves as a proof‑of‑concept for next‑generation rotary applications, from track cars to potential hybrid‑assist power units. By publishing detailed telemetry, Mazzei provides valuable benchmarks for aftermarket tuners and manufacturers exploring high‑flow turbocharging on unconventional engines. The project also highlights a growing niche market where enthusiasts pay premium rates for bespoke engineering services, reinforcing the business case for specialized performance shops. As rotary technology resurfaces in discussions about compact, high‑rev power sources, Mazzei’s findings could influence future design strategies across the automotive sector.