(2020 718 GT4 Clubsport – Track Day Edition)
If you’ve followed Racer on Rails for a while, you already know our philosophy: take great cars, make them better, and then drive the hell out of them. This 2020 Porsche Cayman GT4 Clubsport Track Day Edition is the perfect example — a factory-built Porsche Motorsports car with real pedigree and a second life that spans endurance racing, time attack, and driver development.
Before we go deeper, it’s important to understand which Clubsport variant this is, because Porsche built several versions:
718 Cayman GT4 Clubsport Variants
Track Day Edition (This Car)
- Designed for private owners and track day use
- Same 425 hp 3.8L flat-six as Comp version
- Lighter-duty fuel system
- No air-jack system (but provisions exist)
- Not homologated for GT4 racing
Competition Version (Not This Car)
- Fully homologated for GT4 racing
- Air-jack system included
- Larger motorsport fuel cell
- Endurance switches & safety electronics
- Homologation restricts power/aero changes
- Carbon and natural fiber material body panels
Newer 718 Cayman GT4 RS Clubsport
- 4.0L RS-based platform
- More power, higher RPM ceiling
- Improved aero and suspension
- The current model used in IMSA/SRO GT4
- Much closer to a “mini Cup Car”
Our car — the Track Day Edition — gives us the freedom to pursue more aero, more setup range, and more developmental headroom than the rules-restricted Competition version.
Where This GT4 Clubsport Came From
Photos of the car from its Ann Doherty era after arriving at RoR.
This GT4 Clubsport began its life with Ann Doherty, who ran it competitively in SCCA T1 and GT2 before upgrading to a 991.2 GT3 Cup Car.
Because the car came from Ann, we gained two major benefits:
- It had been maintained at a true professional standard.
- It had already proven itself at a national competition level.
When she moved to the Cup Car, we took ownership of the GT4 and immediately put it to work.
What We Used It For
1. Endurance Racing (2024)
The first chapter of this car’s life with us was national-level endurance racing:
- WRL Road America — April 2024
Our first outing. Strong pace, great aero learning, and flawless reliability. - ICSCC Cascade 8 Hours of Portland — October 2024
A full-day grind that gave us massive data on tire wear, pit strategy, and aero balance.
The car was consistent, predictable, and incredibly reliable — exactly what you want in an endurance platform.
2. OnGrid Time Attack (2025)
With the Dundon Valkyrie aero package installed, the car moved into OnGrid GT+ and instantly became a serious contender.
Huge downforce. Big mid-corner speed. Better braking stability. It was a transformation.
Check out one of the flying laps from this past summer – matching 992 and 991.2 GT3 Cup car lap times!
3. Driver Development & Testing Tool
This GT4 became one of our strongest tools for:
- Advanced driver coaching
- Back-to-back setup testing
- Tire comparisons
- Driver development beyond Spec E46, T3, and regional touring classes
Turnkey speed. Zero drama. Endless data.
Factory Specs — 2020 Porsche Cayman GT4 Clubsport (Track Day Edition)
PHOTO SUGGESTION: Interior cockpit photo or engine bay shot.
Engine & Drivetrain
- 3.8L naturally aspirated flat-six
- 425 hp @ 7,500 RPM
- 7-speed PDK w/ motorsport tuning
- Motorsport cooling system
- Mechanical LSD
Chassis & Safety
- FIA welded cage
- Motorsport wiring harness
- Composite doors
- Fire system
- Air-jack provisions (air jack system not currently installed)
- Recaro race seat + 6-point harness
Suspension & Brakes
- 3-way MCS motorsport dampers (upgrade)
- Fully adjustable alignment
- Porsche Motorsport ABS
- Motorsport stability control
Aero
- GT4-spec splitter but currently running the full Dundon Motorsports Valkyrie Aero package (front splitter, canards, rear wing)
- Adjustable rear wing
- Factory Flat floor
- Factory cooling and airflow optimization
Our Modifications & Upgrades
Dundon Motorsports Valkyrie Aero Package
- Full-length carbon splitter
- Functional multi-channel front diffuser
- Canards
- Swan-neck rear wing
- High-efficiency rear diffuser
This fundamentally changes the car’s downforce ceiling and high-speed stability.
Data & Electronics
- AIM data integration
- Radio/comms upgrades
Race Prep & Setup
- Multiple alignment profiles
- Corner balance for sprint, endurance, and time attack
- Dundon headers/exhaust (optional configuration)
- Tire mapping across A052, F200, and slicks
Deep Dive: Dundon Valkyrie Aero vs. Porsche Factory vs. Manthey Racing
Porsche Factory GT4 Aero
- Designed to be predictable and safe
- Built to meet strict GT4 regs
- Limited splitter/wing/diffuser scope
- Great for consistency but capped on downforce
Manthey Racing Aero
- Refined airflow
- Cleaner front-end efficiency
- Slightly more downforce than OEM
- Still constrained by GT4 rulebook
Dundon Valkyrie Aero
- Not rule-limited
- Significant downforce increase
- Real front-end loading under trail braking
- Balanced with a serious rear aero package
- Center of pressure stability improves with speed
At The Ridge, the difference was dramatic: the car stopped washing out in the T3–T4 transition and gained real front-end authority.
Real-World Lap Time Proof
This wasn’t a pure A/B test — different drivers, power levels, tires, and conditions — but the result is hard to ignore.
June 2023 — Homologated GT4 Aero @ Road America
- Hoosier A7 (sprint tire)
- Full GT4 power
- Lap: 2:25.6
April 2024 — Dundon Aero @ Road America
- Yokohama A052 (endurance tire)
- WRL power restrictions (¾ intake blocked)
- Full endurance fuel levels
- Laps: Low 2:24s — consistent
Less power.
Heavier car.
Slower tire.
Faster laps.
Conclusion:
The aero works. It transforms the platform. Check out this video comparison of the Dundon vs Manthay aero on the faster Cayman RS GT4.
What Types of Racing This Car Excels In
Endurance Racing (WRL, AER, ICSCC Enduros, ChampCar Pro)
- Ultra-consistent
- PDK-friendly
- Great tire life
- Zero drama across long stints
Time Attack (OnGrid, GTA, SCCA TT)
With Dundon aero?
It’s a legitimate GT+-class weapon.
Sprint Racing (SCCA ST, ICSCC ST/SPO, NASA ST1/ST2)
Great for drivers moving beyond grassroots or regional programs.
Driver Development
One of the best “advanced learning” platforms we’ve ever used.
Interested in Renting or Developing a GT4 Clubsport?
If you’re curious what a Porsche Cayman GT4 Clubsport can do, we’d love to help.
- Want to rent this GT4 Clubsport for a race weekend or time attack?
We offer full arrive-and-drive + coaching. - Already own a GT4 or Porsche race car?
We can help you extract more from the car and yourself with setup, aero, maintenance, and coaching.
Reach out anytime. Let’s build something fast together.