Jenson Button was buoyed by McLaren's positive start to testing after setting the fastest time of the second day at Jerez.

McLaren failed to get out on track on Tuesday due to an electrical issue, but recovered on Wednesday to set the quickest time after completing 43 laps. With the new engine regulations limiting running for a number of teams, Button said his first impressions of the MP4-29 were encouraging.

"We had a lot of issues yesterday; it's nice to see that we've been able to solve them overnight though," Button said. "Lots of starts last night I could hear from my motorhome so I wasn't worried about being woken, it was nice to hear that the engine was starting. Not a lot of laps today - 43 - but I think it's a positive start.

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"There's no horrible issues with the car itself, no big issues with the power unit in terms of how it delivers, so the basic car itself is where we want it to be. We always aim to have a good base because the way it's going to improve throughout the year and how much we're going to add to this car aerodynamically and also in development in terms of the engine is massive, so having a good base is important."

Comparing his first day in the new car to the start of 2013, Button said he felt McLaren is in much better shape.

"The first day last year was quick but the car had its flaws and we could see that on day one. The car was bouncing around a lot and we had our issues that were not going to be easy to solve. At this moment in time we definitely don't have those issues. The basic car itself is good and it works as you would hope. No scary things with it."

As well as his optimism about the car itself, Button was pleasantly surprised by the new V6 turbo engine.

"I enjoy driving this car. I think the power unit; it doesn't sound as good, that's a fact. It's not as exciting to hear from the outside, but when you're driving it, it sounds good. We've got the turbo noise, we've got the wastegate noise, it's actually quite a nice change."

Button also revealed that he would drive on Thursday morning before handing over to Kevin Magnussen having missed out on running at all on Tuesday.