In this follow-up video at Circuit of the Americas (COTA), we welcome back Randy Pobst to drive my GT4 RS, now modified with Dundon parts based on his initial feedback.

Did these changes address his concerns—and did they make him faster on track, as they did for me? It’s time to find out!

We didn’t just hand him the car and walk away. We worked closely with Randy to dial in the setup to his liking: adjusting compression and rebound, repositioning sway bars, adjusting aero, and tweaking ride height to get the most out of the car.

By the end, the car felt even more compliant, but was it enough for a record lap? Watch and find out.

0:00 - Intro
1:34 - Lap 1
4:12 - Lap 2
6:45 - Lap 3
9:10 - Randy Debrief
18:38 - Reaching Optimal 
20:45 - Randy Stock vs Mod Comparison
26:03 - Plot Analysis
29:48 - Conclusion 

Special thanks to Neghae Mawla, another 4RS pilot, for the fantastic photo used on this video.


#GT4RS #COTA #RandyPobst #Porsche #TrackTesting #PerformanceTuning #DundonMotorsports