Cogging problems 9920/7XL

[Jasper]

Hello guys,

first of all, merry christmas!

I have been driven my savage today in the woods. And I had really bad cogging issues (wich I never had before). When the car was about 20 meters away, the car kept on cogging and drive really slowly. And the car was a few seconds out of control. The car didn't react on the commando's of the transmitter. When the car was in the range of 5-10 meters by me, the car responded well.

I had been made two changes to the truck. The motormount from a L form aluminium plate (50x80x1,5) to a 6mm motormount.







And I changed the steering servo from a standard HPI servo to an Kopropo 2015 FET servo. I connected the FET wire to the + of the receiver pack.

Could these two changes the reason for the cogging issues? Or does anyone have other possibilities? Let me know!

[Dafni]

Originally posted by Jasper
@ Dafni,

I run a warrior 9920 with 7XL on my savage with a Futaba T3PDF and I have no problems with extreme cogging.

Let's knock on wood! Do you have another radio to try??

Was the steering acting weird?

[Jasper]

Haha, I didn't have any problems with my Futaba T3PDF but since now I do.

I have an different radio to try, but that is also an Futaba. The steering wasn't acting weird. Tomorrow I will change the servo to the stock HPI steering servo.

[Sneeck]

Try and run it on that skate park. Might be some interference in that forrest? Like radio/ tv antenna's or the like.

[Nick]

If your using a UBEC, try a reciever battery pack instead.

My UBEC caused me loads of problems, inteference/stuttering etc'.

[Sneeck]

I connected the FET wire to the + of the receiver pack.

Also if you look at the last pic there is a receiver pack clearly visable;)

[coolhandcountry]

Is your new motor mount rubbing something.

[rchippie]

Originally posted by Nick
If your using a UBEC, try a reciever battery pack instead.

My UBEC caused me loads of problems, inteference/stuttering etc'.

I run a 9920 & 7XL with 14 cells, & a reciver pack (no ubec) in my mbx4 with no cogging what so ever.

[Nick]

Originally posted by rchippie
I run a 9920 & 7XL with 14 cells, & a reciver pack (no ubec) in my mbx4 with no cogging what so ever.

Yeh.

I used a UBEC for 2 runs and hated it, a power pack does it loads better in my honost opinion. Not fussed about a little more weight and something extra to charge. :)

I had problems soldering the copper wires of the UBEC onto my ESC/connecters too...

[Jasper]

The problem is solved. Thank you for all your inputs.

I changed the servo to stock HPI servo and the cogging and bad radio signals were gone.

I also tightened the slipper. The truck is now pulling wheelies! And the top speed is also higher! If I put the throttle to hard, the truck is flipping over. This is cool!

[coolhandcountry]

I am glad you found the problem out. sounds like you enjoying your truck. It is not a problem trying to help out a rc brother. :D