Sixth and eighth places for Lance Stroll and Sebastian Vettel earned the team 12 points, the team’s best result of the year.
The score moved Aston Martin from ninth to seventh in the standings, ahead of Haas and AlphaTauri. He is now only 15 points behind Alfa Romeo, sixth.
However, Krack warned that the situation could change quickly if a bad weekend for Aston Martin coincides with a good double top 10 finish for one of its closest rivals.
“They’re very valuable because we’ve moved up two places,” he said of Singapore’s points. “But we have to be vigilant, because it can backfire quickly again. So we really have to stay focused, it’s far from over.
“We always wanted to beat at least these two teams [Haas and AlphaTauri]. If we have one or two more races like this, we can even look a little further. But I think we have to stay realistic, keep working hard and see where we are.
“There are still five races to go. And there are still a few points to win. And a double DNF at Suzuka and a big score for the others can mean it goes the other way again, so we really have to stay on that and try to do it the best we can.
Lance Stroll, Aston Martin AMR22, fights with Sebastian Vettel, Aston Martin AMR22
Photo by: Zak Mauger / Motorsport Images
Krack was relieved that in Singapore, for once, Aston had put in a solid performance on a day when some leaders ran into trouble – and were able to improve on their streak of 10th places in the process.
“At the end of the day, hard work pays off, and the constant effort to try to be there when it counts,” he said. “We had a few occasions where we always get one point, two points.
“Today we had a bit more luck with the attrition. But we were there when it counted, the drivers made no mistake about it. And then it pays off in such races.
Krack believes the team has been finding performance lately as upgrades have started to pay off.
“I think we have progressed from Zandvoort. We got another small update here. And we’ll have a little one next week [at Suzuka]. We have identified the car’s weaknesses and regularly tried to eliminate them, which is good.
“Obviously, we come a long way. But now I think you saw in Zandvoort that we weren’t so far from Alpine and McLaren. And for us, the most important thing was to get ahead of this midfield group. And this we succeeded.
Krack believes that the team can continue to improve their car even if only minor improvements are still being made by the system.
“We had an update at Silverstone which took us a race or two to really figure out how to make it work, then we had a little adjustment in France, which got us on the right track I think.
“And then we realized more and more what we had to work on. And that is why we are now doing what we can within the framework of the financial regulation; what is still possible to do.
“So it’s an adjustment here, it’s a part there. Nothing major anymore. But I think it’s very important that we keep going, trying to figure out what’s the next step to go faster .