9 Double Speed Gems in a B2, undergeared?

[Gutter Ball]

Heehee...I was getting impatient waiting for some motors I bought off here, so I went and bought a 9 turn double Speed Gems for my B2! The gearing chart doesn't go that low though...so I geared it at 21/81. Super faaaaaaaaaaaaast! The motor gets a bit warm, would that be okay for a 4 minute run?

[standardbiker]

try like a 21/78 very good speed andlast 4-min easy, and wont over heat engine or ESC

Rydog :D

[cck]

Do you know how fast it can go? I want to have the same set up for my B3. I hope it can go 45 MPH.

[Gutter Ball]

No Dyno's or Radar guns..I'll have to use that "how to calculate top speed" thread for some information on how to do it via camcorder :)

[Obi112]

Well, 21/81 sounds like too much to me. Is the motor hot after running? Is the ESC hot? If either of them are hot, try dropping to a 17-19 tooth pinion (at least). If neither of them are hot, have fun with your amazing speed, but be careful because you could shorten the life of the motor by overgearing.

[HowieStern]

oouuch.... 21/81 is wayyyy too high for a 9 turn in a B-2...

17/81 is still a bit overgeared, but may work.... i ran a 9 turn in dirt oval last year in my B-3, and i geared 15/81 with decent results.... it was also a speed gem.... just fyi, it needed to have the comm turned and new brushes after every three packs or so.... hope you have a lathe handy.... LOL....

peace out.... :)