Originally Posted by Emmett751

Need some help with getting a base line gearing for my new XB4, running a 6.5 on carpet. I've tried multiple different combinations but the darn thing still get screaming hot FAST! Last combo i tried was 18/84, and after 2 minutes the motor was around 185. I've tried going down in pinion, going up in spur, up in pinion... Seems the popular 18/81 is just too tall for this track, as were some other combos i tried, so far the best feeling was 16/84 but even that was getting super hot... Im kind of at a loss with what to do and where to go with it.

Track: Small, tight very high grip. 10-11 second lap times.
Temp: Southern Alabama so right now were looking at 100+ ambient temps.
Electronics: SMC 160A, SMC 6.5 (did have RSX and Gen 3 6.5 but epic meltdown happened)
Kit: Brand new, super free drive train nothing binding, gear mesh properly set. Fan on ESC, Fan on motor. Schumacher minipins/cut staggers

Originally Posted by Rodarbal

Emmett, what's your timing on your motor? Any boost added in the ESC?

Originally Posted by suby723

That is normal. Mine also rubs slightly but it doesn't affect anything. I used a little chassis protector in the area to protect the paint.

Originally Posted by rekim

i am just about finished building my xb4. i find that the servo horn slightly rubs against the body when turning the wheels. has anyone else seen this or have i messed something up

Originally Posted by bd581

I just ground down the Hudy servo horn, basically removed the outer hole.

Originally Posted by Emmett751

Need some help with getting a base line gearing for my new XB4, running a 6.5 on carpet. I've tried multiple different combinations but the darn thing still get screaming hot FAST! Last combo i tried was 18/84, and after 2 minutes the motor was around 185. I've tried going down in pinion, going up in spur, up in pinion... Seems the popular 18/81 is just too tall for this track, as were some other combos i tried, so far the best feeling was 16/84 but even that was getting super hot... Im kind of at a loss with what to do and where to go with it.

Track: Small, tight very high grip. 10-11 second lap times.
Temp: Southern Alabama so right now were looking at 100+ ambient temps.
Electronics: SMC 160A, SMC 6.5 (did have RSX and Gen 3 6.5 but epic meltdown happened)
Kit: Brand new, super free drive train nothing binding, gear mesh properly set. Fan on ESC, Fan on motor. Schumacher minipins/cut staggers

Originally Posted by rekim

i finished building now and it is really tight fit for the wires when trying to put the body on. i had to tie down every wire because they were hitting the body and it wasnt sitting flush. i did eventually get it. i put a 13.5 motor in it and it feels a bit slow to me.

overall though i love the buggy. it seems to handle pretty well. a little better than my xb2 but i have my xb2 pretty dialed for my driving style.

hopefully it doesnt rain tomorrow and i get to drive it. it was so late by the time i finished building it that i only got to drive for 10 minutes or so.

1 addtional thing i wanted to ask. i hit the throttle with all 4 wheels in the air and one wheel moved up and down. it drives fine when its on the ground, just when the arms are fully extended down, did it do this

Originally Posted by suzukipro

If you are running a slipper make sure it isn't too loose, I had the same issue and gearing changes didn't make a difference until I tightened it. Be carefull not to go too tight though or you'll start breaking expensive items...

Originally Posted by lyons238

really? my slipper is set to 0mm (all the way loose) and I NEVER hear it slip with a 5.5t motor on carpet and clay...

taking the slipper apart shows very very minimal and light scuffing. it's noticeably barely ever slipping. and since i never hear it im sure it only slips for a split second.

Originally Posted by symmetricon

Yeah, mine is at 0mm also. I run on high bite clay and my car will pop wheelies.