I have one, I bought the motor as soon as it came out. I used it in the RS4 micro, and it was close to a big block. I did drop it into my Mini-t last night and it didn't make much of a difference. I think it may be the motor is messed up. The last time I used it in my RS4 it wasn't great. A friend of mine put the Monster motor in his mini-t, with a 6 cell pack and he was pulling wheel stands from a dead stop. As far as run time, whenever you increase speed, you decrease run time. You can probably get good run time with the Mini-t, but not as good as stock.
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Psychopathic Grafix
Backbreaker racing
South Shore Hobby
I have one in mine and to tell you the truth, I haven't noticed any difference. I do use the 6 cell pack and bearings, but not really any faster than the stock motor. No wheelstands here unless I back up first. Haven't really clocked the runtimes though.