200+ MPH Performance with Garrett G-XRace

In drag racing, real performance is proven at the track—not just on the dyno. For Norris Prayoonto and the Prayoonto Racing XFWD Honda Civic, that proof comes in the form of 200+ mph passes and consistent 7-second quarter-mile runs.

Powered by the Garrett G-XRace GXR45-73mm turbocharger, this K-series combination has pushed beyond previous limits, delivering the performance needed to make history as the first K-series platform to exceed 200 mph in the quarter mile.

The Build Behind the Record

This XFWD Civic is built for extreme front-wheel-drive drag racing performance:

• Billet K24-based engine, destroked to 2.2L
• Methanol-fueled setup
• PPG 4-speed transmission
• Garrett G-XRace GXR45-73mm turbocharger

The move to G-XRace came after the previous turbo setup reached its limits at roughly 61 psi. The team needed a class-legal solution that could deliver more boost, more airflow, and stronger top-end performance.

The GXR45-73mm delivered immediately.

From 60 PSI to 70 PSI — Unlocking More Power

At The Shootout presented by Buschur’s in 2024, the impact of switching to Garrett G-XRace was immediate.

• Boost increased to ~70 psi
• ~10 psi gain over previous turbo
• First-ever 200+ mph quarter-mile pass for this platform

That additional boost capability translated directly into real-world performance, pushing the car further into the 200 mph range and establishing a new benchmark for K-series drag racing.

Track Data Over Dyno Numbers

Unlike many builds, this car is only dyno-tested to around 30 psi, while actual race conditions exceed 60–70 psi. Estimated output is in the 1,300–1,400 wheel horsepower range, but the true validation comes from time slips.

The car has consistently delivered:

• 7.90-second quarter-mile passes
• Speeds exceeding 200 mph

Even in challenging conditions—95°F ambient temperatures and high density altitude—the car ran 7.96 at 198 mph, proving the turbo’s efficiency under extreme load.

Built for the Back Half

One of the clearest advantages of the G-XRace platform is its performance in the most critical part of the run—the back half.

• ~148 mph at the eighth mile
• ~198 mph at the quarter mile
• ~50 mph gain in the back half

This is where turbo efficiency matters most. The GXR45-73mm continues pulling at high boost and high load, delivering airflow and power when it counts most.

For racers, this translates to stronger acceleration through the second half of the track, where races are often won or lost.

Why Racers Choose Garrett G-XRace

The G-XRace lineup is designed specifically for motorsport applications, delivering measurable performance improvements over previous turbo platforms.

• Up to 11% increase in compressor flow vs. G-Series G45-1350
• Enhanced pressure ratio capability for higher boost operation
• Improved efficiency at high airflow conditions
• Lightweight aluminum backplate for reduced weight

The GXR45-73mm delivers the combination racers need:

• Class-legal sizing
• High-boost capability (70+ psi)
• Improved thermal efficiency
• Straightforward upgrade from existing G-Series setups

Proven Reliability Under Extreme Conditions

Performance is only meaningful if it can be repeated. In a demanding drag racing environment, reliability is critical.

• 70 psi boost levels
• Multiple passes per event
• No turbo reliability issues reported

Even under repeated high-load use, the G-XRace turbo has shown no signs of wear, delivering the consistency racers need to compete at the highest level.

As Norris Prayoonto explains:
“It’s reliable, it gives you the option to run water cooling for added longevity, and the performance gain is the best I’ve seen for a turbo of this size.”

Key Takeaways

• First K-series to exceed 200 mph in the quarter mile
• Up to 70 psi boost capability with strong efficiency
• Consistent 7-second performance
• Significant airflow and power gains over previous turbo
• Proven reliability under extreme racing conditions

Conclusion

The Garrett G-XRace GXR45-73mm turbocharger has proven its performance where it matters most, on the track. From breaking speed barriers to delivering repeatable, high-boost reliability, the platform offers a clear advantage for competitive racers.

For those looking to push beyond limits, the choice is validated by results: more boost, more speed, and more performance potential.

Disclaimer

Performance results will vary depending on vehicle configuration, tuning, environmental conditions, and class regulations. Data presented reflects one specific race application.