Reading boss Brian McDermott felt his side showed their true identity after twice coming from behind in their Capital One Cup victory at QPR.
The home side broke the deadlock at Loftus Road through Junior Hoilett and although Kaspars Gorkss levelled matters against his former club, QPR edged back ahead with a goal from Djibril Cisse.
However Reading fought back again, an outstanding Nicky Shorey free-kick making it two apiece before Pavel Pogrebnyak's cheeky backheel saw the Royals progress.
The away side could even afford to see former Fulham forward Pogrebnyak miss a stoppage-time penalty as they made it through to the last 16.
"I was proud of my team and the way they came back," said Reading boss McDermott.
"I talked about identity and the last two games in the Barclays Premier League against Spurs and West Bromwich Albion I just feel we have not performed to a level.
"Our identity as a team is what you saw tonight, what we're about, and I know if we perform at that level and that tempo with the way we pass the ball with pace then we are going to be more than capable in this league. No problem.
"I felt we needed to strip the team back to what we're about, really.
"In the last couple of games our tempo has been slow and we haven't getting crosses into the box or creating too many chances.
"We really stripped the side back. We had good conversations in the dressing room and we wanted to get a result and we did that tonight."
Reading's reward is a home tie with Arsenal and, while pleased with the draw, McDermott's main focus is now on getting a first Premier League win of the season.
"It is a good draw, we're really happy with it," he added. "I am sure we'll have a few people at the Madejski Stadium for that.
"We look forward to that but before that we have a big game against Newcastle that we're really looking forward to and tonight's result will be important going into that."
QPR will also hope to register a maiden league victory this term when they take on West Ham at the weekend.
Manager Mark Hughes was left wondering what could have been after seeing his side twice surrender a lead, though he was not too downhearted with their display.
"At 2-1 going into the last period of the game we certainly felt we had done enough," the Welshman said.
"We had to battle hard for that and credit to Reading because it was a different test today.
"We had to stand up to a physical challenge and they did a pressing game, which I thought for the most part we dealt reasonably well with certainly in the first half.
"We got the ball down and created a number of good opportunities that we didn't really capitalise on.
"Obviously at 2-1 I felt we were in the ascendancy and had done enough, but it was an outstanding free-kick from Shorey, which he always has the capability of and at 2-2 it was anybody's game.
"We are disappointed with the manner of the third goal because there were too many consecutive errors that led to the lad having space and time to be able to backheel it in our six-yard box.
"To lose it in that manner is disappointing but it is understandable to a certain extent given the changes and the injuries we have at the back.
"We haven't had that continuity at the back, which you need to bang results out.
"It is difficult at the moment because we're playing guys at different levels of fitness and we're trying to get everyone up to speed.
"That will come but we're just not there at the moment."
To make matters even worse for QPR, Alejandro Faurlin limped off; the Argentinian midfielder has only just recovered from an anterior cruciate ligament injury but Hughes believes he has avoided another serious blow.
"I have not had an update, in fairness," Hughes said. "I think he landed on his hip.
"As a consequence, he was struggling to walk because he might have banged a nerve or something but I am pretty sure it was not his knee, thankfully."