I went to the track today with the UBEC removed & a reciver pack installed. It still lost the signal after about 5-6 minutes of running.

if it shuts down it will cause a shuttering problem, indicating it has shut down.

Got the red wire unplugged going to the Rx??

Did you loose steering to when it happened with the rx pack?
If so I say rx is faulting.

No stuttering just looses signale for a couple of seconds then kicks back in. Temps were around 140 on the side of the MM heat sink , & i still had steering. Yes i have the red wire unplugged.

Ok. Have you tried to change the gearing a little?
I may be thermalling and the fan is cooling it off before you get a accuall reading of temp.

Leroy i've thought that maybe the issue but i dont have anymore gears . Can i call you ?.

You got pm.

I dont think its esc related.

I think there may be something wrong with the esc... I have one that does something similar. It's going back to CC but I haven't sent it yet.

Mine will start doing it after a few minutes... and once it does, it happens over and over. It "reboots"... shuts off and back on. It does a beeping/flashing thing like when it's first turned on... I'm not sure if it's exactly like the same or not. I guess I should have paid closer attention.

I played with it the other day and it will even reboot with just a slight throttle input if there's a high load on the motor, like a foot in front of the car. :)

It can't be a failsafe kicking in... like low voltage, over current, thermal... all vital signs are good. Well, it could be a failsafe, but it's malfunctioning.

It's not supposed to do this and it's never done it before.

Edit: Oh, and I have tried 3 ubecs, 2 batteries, 2 rx's, 2 servos... no luck. Only thing not changed out was the motor and esc.

incorrect; if the UBEC would shutdown, you would not neccesarely have a stutter, as simple as that.

Weird thing now the UBEC is replaced with an external pack, that you keep the steering. while the esc shuts down;

Mike, here are a few q's;

-Did you tried another set of batteries? and what batteries is it that you are using?
-Is your LVC disabled?
-have you got another receiver to try?
-did you tried reprogramming the esc?

I talked to hippie on phone. The buggy he used to run was geared lower than
the buggy with problem. Higher gearing more amp draw more heat. Yes the
fan helps cool the esc but it is still cooling while you are trying to get temp gun
and a temp reading. He can't drop the gearing for way the buggy is set up.
Well he can but it is not easy or cheap. How else could one tell if it is a
thermal problem if you can't change gearing?

Maybe use some smaller tires somehow?? I would also decrease the start power as much as possible. That should also be a little more gentle on the ESC...

Rene in answer to your ?

Yes 3800's
Yes
Yes i will try a different reciver latter.
No

mabey try reprogramming the esc because that is the only thing on the list you did not try.

@ rchippie; 3800's of what brand?
Please let me know what the other receiver does.