More from Maro Engel
More from Black Falcon
Listen to this article
Vanthoor had laid down a time to beat of 2m18.605s behind the wheel of the #117 Team75 Bernhard Porsche 911 GT3-R, which Engel missed by just 0.055s on his first lap.
But on his second lap former DTM and Formula E racer Engel nailed a 2m18.588s to grab pole for himself and his teammates Yelmer Buurman and Luca Stolz.
"Going into qualifying I was a little bit worried we might not have a chance of pole, but as soon as I did the first three-quarters of the first lap, the car was feeling great," said Engel.
"My engineer told me that I only needed half a tenth, so I squeezed everything possible on lap two and super-happy that it worked out."
Vanthoor, who shares the #117 Porsche with Timo Bernhard and Earl Bamber, joked: "Maybe I should have gone to the toilet once more, it would have helped!
"If you asked me to sign [for second] before Superpole I would, but if you're on pole for a long time and then you lose it by 0.017s, you would be disappointed or you wouldn't be a racing driver."
Ferrari made it three different marques in the top three courtesy of Davide Rigon's effort of 2m18.806s at the wheel of the #72 SMP Racing 488 GT3, which had been the time to beat until it was bested by Vanthoor.
Aston Martin's pair of R-Motorsport Vantage GT3s ended up 12th and 13th in the hands of Maxime Martin and Jake Dennis, while the sole cars in the shootout from Lamborghini and Nissan ended up 19th and 20th after both were handed penalties.
The FFF Racing Lamborghini Huracan GT3 of Dennis Lind and the KCMG Nissan GT-R NISMO GT3 of Katsumasa Chiyo fell foul of the rules dictating the time at which cars must leave the pits during the Superpole session.
|13||76||Jake Dennis||Aston Martin||2'19.326||0.738|
|14||62||Maxime Martin||Aston Martin||2'19.341||0.753|
|18||59||Andrew Watson||Aston Martin||2'20.470||1.882|
* penalised for not leaving pits at the correct time
Indianapolis replaces Laguna Seca on 2020 IGTC calendar
Bentley questions Spa 24h BoP after missing Superpole