Mamba monster cogging

[jackson020]

I have a converted Cen GST with a Mamba Monster ESC and am having a cogging issue.If the truck is stopped,it will not move unless I give it a tap with my foot.I dont have to move it hard,just a little tap does the trick.Once the truck starts though it goes like crazy.It has a ton of tourqe and runs about 35 mph.I am confused here.I thought if the gearing was so bad that I had to kick it to get it moving that there would be no tourqe.This truck wants to tear the rims right off of it.I am using a KB45-XL 700 KV motor,Mamba monster ESC,5s 20c Zippy lipo.I have a 66t spur gear and a 18t pinion.It has alot of tourqe and nothing seems to be getting hot.The battery gets slightly warm and that is it.Any suggestions?Thanks

[nitrostarter]

Man, that surely isnt a lit of rpms, less that 14,000?

[bryan]

I Dont think its the Momba Monster!

[jackson020]

Originally Posted by bryan

I Dont think its the Momba Monster!

Any idea what it is then?

[jackson020]

Originally Posted by nitrostarter

Man, that surely isnt a lit of rpms, less that 14,000?

Yeah,I had planned on running a different setup and then changed my mind.I had already purchased the motor though.I plan on changeing the motor and getting bigger batteries in the future.

[nuz69]

Probably bad timing, how many poles do you have with your motor ?

[nitrostarter]

The KB is a 2-pole motor in a 45mm can.

[nuz69]

Then timing must be at 0

[jackson020]

hi and thanks for the reply.I was thinking it may be a timing issue since there is plenty of torque.I will check to see that the timing is at 0.Any suggestions if that doesnt work?

[nitrostarter]

More voltage or different motor.

[nuz69]

Castle 1520 or 1717 motor ;) ;) ;)

[SunnyHouTX]

0 timing, and more voltage (around 8S - 10S) should do wonders with that motor. Of course, gearing will have to be changed according to voltage and speed you wanna run

[BrianG]

Like was said, the kv is way too low for 5s; only ~13000rpm. That setup would work if you were geared for around 10-15mph, but to get 35mph, you probably have a really high rollout ratio (geared tall) and the ESC is having a hard time to get the motor to spin fast enough to get a good rpm reading. Also, you are no doubt pulling quite a bit of current on start due to the tall gearing. You either need a higher kv motor, or run a different ESC and 10s (and then gear down to keep your 35mph speed).

[jackson020]

Thanks again for the response.I will just get another motor then.I am on a tight budget right now so I am going to have to stick with HobbyCity motor for now.Think 1500 KV would be a good motor and just use a smaller pinion?

[SunnyHouTX]

May be a little higher. Say around 1800Kv to 2000Kv for 5S