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Cardiff Blues are level with them on 17 points after their 22-15 win at London Irish with both the group pacesetters enjoying home advantage on Sunday, as Racing make the trip to Cardiff City Stadium.
"Sunday is a huge game - as was the Racing game - but we went over to France and did a job," said captain and versatile half back Greg Laidlaw.
"And now we have got ourselves in a good position so this week will be pretty much the same as usual, we will de-brief again and then focus on London Irish.
"This week we will prepare as we do every week but it is great that there is a lot of belief in the squad at the moment.
"We know we have to keep our feet on the ground but hopefully we can get a big support behind us this weekend at Murrayfield and hopefully a lot of people will come along and see us go through to the quarter-finals."
And coach Michael Bradley hopes his team can make that home advantage count and make it three from three in the Scottish capital.
"We have the opportunity to qualify in front of our own fans on Sunday and that's a great opportunity for Edinburgh rugby," he said
"And we are lucky, Murrayfield can hold 70,000 so we need to get as many people there as possible.
"It would be great it everyone turned out and what good practice it would be for Scotland v England in the 6 Nations and also a huge benefit to Edinburgh Rugby.
"We do have the advantage as we are playing at home and there is no need to travel and I think our fans will be excited about it and the players should be excited as well.
"It could be a fantastic day on Sunday but we have to remember when you go across that line that its still just a game and we have to do the basics right - and we didn't do them all right against Racing."
But winning on French soil is always something to cherish, Laidlaw adding: "I was absolutely chuffed and delighted to go over here and win what I thought was a really tough game.
"We played off limited ball so the forwards will be looking to sort that out ahead of meeting London Irish. We scored three good team tries again and we are delighted with that especially away from home in a tough place to play
"We prepared well last week and we knew that coming to France we weren't going to get a game of easy rugby especially against a pack that size.
"But we put systems in place all week and everyone stuck to those and that's why we won.
"We always wanted to open the game up and we knew that Racing would want to play in the forwards, especially at home."
