Once again, the closest-to-stock bikes beat the closest-to-stock cars by over 12 seconds on the same track.

Laguna Seca:

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AMA Superbikes fastest lap time
Matt Mladin, Yoshimura Suzuki
GSX-R1000

1:26:160 AMA Superbikes

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Speed World Challenge
Randy Pobst, 3R Racing
Porsche 911 Cup

1:38.388 Speed World Challenge

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Given more downforce the cars could achieve greater cornering speeds and better times.

 

Road Atlanta didn't have quite the separation.

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AMA Superbikes
Matt Mladin, Yoshimura Suzuki
GSX-R1000

1:23.857

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Speed World Challenge
Mike Fitzgerald, 3R Racing
Porsche 911 Cup

1:29.543