2017 Official Porsche GT3 Cup Challenge USA Spotter Guide


Latest Guide:  V1b
Latest Update: 1 May 2017

Welcome to the Official Spotter Guide for the  2017 Porsche GT3 Cup Challenge USA by Yokohama.  A championship sanctioned by IMSA. The Guide was also commissioned by IMSA,

Note: This is a season long Spotter Guide, so actual entry list on a race by race basis may vary. Hard copies of this guide are also available at the track from the IMSA Support Paddock. Note, since Rd1 #25 has moved from Platinum to Gold class which is not shown on the printed guide.

The corresponding guide for the Canadian series is available here.

Road America BONUS


Thanks to commissions from IMSA and Lamborghini Squadra Corsa, every race this weekend has its own official Spotter Guide.

A combined file which includes all the Spotter Guide is available to DOWLOAD  (or click image above), or, you can download a guide individually at the following dedicated pages:

At races where a WeatherTech/Continental event takes place, a combined guide featuring all series will be available on the IMSA WeatherTech page.

Thanks to IMSA for partnering with the guide If you get a few seconds, please thank IMSA on Twitter. Without their support, there would be no guide.


The Porsche GT3 Cup Challenge USA Spotter Guide is produced by Andy Blackmore Design with assistance from IMSA.