Yeah its not always the power but the set up - the devils in the details s they say. Im am honestly not sure which is more powerfull the TM or the TZ...I mean I have neither, just seen some here and there and haev never had the need at this point to know the exact power, weight, rpm ,torque...ETC details as such. But equally both would be great engines for the track. i dont think that either would be too powerfull once you have made teh nescessery changes though. You might have to change the CB and SG set up and some other small things here and there.