oh... I can't believe I didn't see it the first time.
anyways, even 30-35 is no problem with the 3700kv. you can do that on 3s with mild gearing. On 4s, you're going to be in the 40 mph range with normal gearing.
I run the same motor on 2s & 3s in a M18T. I'm geared at 14/54 right now, and I'm guessing low 20's on 2s and low 30's on 3s. These are perfect numbers for mini racing... unless you're on a 1/10th scale track.