The Petit Le Mans event in Georgia last weekend was the first time the former New Zealand Grand Prix winner had been at the wheel of a specifically-prepared Porsche 911 RSR, and his first 10-hour classic.
"To get the chance to contest this race with the 911 RSR then climb the podium was a fantastic experience," said Bamber.
He scored second with works drivers Michael Christensen (Denmark) and Patrick Long (USA) at Porsche's double victory.
"The days spent on this track were like a crash course in long distance racing for me. I've learned a great deal from the whole team."
While Bamber came into the Porsche Mobil 1 Supercup with a bit of a reputation as the Asian champion and scholarship recipient, everyone had their heads turned immediately when he won the opening round at Circuit de Catalunya, near Barcelona.
He then won the second on the ultra-demanding Spa-Francorchamps circuit in Belgium.
"Porsche's support has given me the chance of a lifetime as a race driver.
"I felt I was in good hands right from the start, and this gave me a lot of confidence," he said.
"I've met some great people and I've reached new levels in every aspect as a race driver this season."
Bamber also made a big - winning - impact on a brief foray into Germany's Carrera Cup series, earning praise from fellow Porsche driver Timo Bernhard, who is amazed by his progress.
"It's incredible how quickly Earl familiarises himself with new tracks and how he brought our team forward together with the engineers.
"It's a pity he couldn't finish the [Deutschland] season. Earl was the guy to beat in the Carrera Cup Deutschland."