1515 2Y on 6S???

[suicideneil]

Nay, around 1500-1700kv for 6s lipo is far more common and widely used with great results. I myself run a 2000kv motor on 5s lipo for around 35,000rpms- gearing tall on low voltage with a high kv (relatively speaking) will cause much greater current draw compared to gearing down on higher voltage with the same kv. I would suggest running 6s on your 1515 1y and gearing down before you concider getting a new motor; a 1100kv item would need more like 8-10s to run well from what I've seen- that 30-40k rpm is the magic number to aim for.

[zeropointbug]

Yes, Niel is right on. Don't waste money getting a different motor like I said before.

As long as you gear for a moderate speed (~40mph?), it's not going to be overpowering, you can easily manage it... might be a surprise and a grin on your face at first.

I personally ran 5s A123 on my 1512 3D and it felt like poop, and motor ran just as hot too compared to running 7s A123, IIRC.