Boy, I must have the Quark 80 from hell. I added a couple caps, heatsink , bec, and ran it in my E-revo for months, with a Medusa 36-60-2000. Without a fan it would overheat after about 20 minutes. With a fan it would run all day. That was running 45mph on 4s. Now it's in my Slash with a HV4.5 running 3s, and does real good.

Of course, without the heatsink mod, and caps, I would imagine it being much less capable.