playboy

is this moto overkill for racing on a medium size track

schmelme

iTrader: (13)

YES way overkill even with 5cell. Even in a 4whl. 7.5 for 2whl, 6.5 for truck, 5.5 for 4wd.

ms3 Chris

iTrader: (2)

If by 'medium sized track' you are referring to a Drag strip, then yes, it would be ok. I raced with a guy who had one in his XXX-4 and it blew his diffs out and pretty much destroyed his drivetrain on a regular basis.

Drew Manzella

iTrader: (35)

I have driven a friend's BJ4 with a 3.5/4800Mah Lipo in it here at our local track. The track is small-medium and pretty rough.

In reality the 3.5 is probably too much BUT it was driveable (and a lot of fun) if a little restraint was used. The only time it gets hairy is flat out on the front straight. 1/10th scale offroad anything seems to really want to lift the front end and keep going up unless the throttle is modulated quite a bit.

I'm not sure I was ever able to get it wound out until the battery started to fall off.

I run a 5.5 in my XXX-4 and to be honest - I may go to a 4.5 or even a 3.5 in it.\

As a further point of reference - the BJ4 with the 3.5 in it is owned by the person I bought my XXX-4 from. The 3.5 was in the XXX-4 before he sold it to me. Neither car has had any driveline issues as a result of the 3.5.

foolio

iTrader: (3)

That is pretty much an onroad racing motor. Way too much power for offroad in my opinion. Now, if you are going to bash and just want straight line speed runs on the road in front of your house, you might be okay. I would probably stick with a 6.5 or a 5.5 though for racing.