Originally Posted by CPatrick
You had to know that this was coming...
10 second freespin? That's crazy talk! I'm averaging about 3 to 4 seconds. I purchased this rolling chassis used, but it's beautiful. There are front and rear ball diffs, but I haven't opened them up to see what shape they're in. I was giving my rear wheels a good "price-is-right" spin, and there's no way I'm going to reach a 10 sec. freespin in this current state.
This setup must eat bevel gears, because the person who sold me the chassis provided 15 new bevel gear kits (73501).
The November issue of RC Driver (pg. 190) shows a new Pro 4 titanium spool, made by Titanium Racing, Ltd. I was thinking of trying one.
hehe, I know of belt drives with more spin than that
With dual diffs, I can get around 20 seconds on a good flick of the wrist.
Here's what will help you: Take your charger and put a stock motor in the car and run it. Write down the amp draw. Then remove the motorbulkhead with the motor still screwed in (very important)
1. Do not use the center bearing that fits into the motor bulkhead.
2. Do not use grease on the gears (it will make the car a little louder, but when I tried the white grease, it decreased freespin a little)
3. Soak all the bearings in motor spray, put them in a cup with the spray and place them on something that vibrates, like a fishtank or washing macine.
4. Remove them and use bearing oil like this: rcprofessor.com
Put a drop on one side, then another on the other side.
5. Put all the bearings back in the car. Make sure they fit in perfectly.
6. Shim the gears out so that there is a "tick" of play between gears.
7. Now put the bulkhead back in and reassemble the center shaft without the bearing.
8. Run the motor off your charger. Did the amp draw go down? If so, then your tranny is more free and you should get more freespin. If you don't have a charger that can do this, then just hook up a 4cell pack and run it through the motor until it runs out of juice.
9. Put the tires back on and check out the spin. I should have increased!!!!!
This is what I've done with my Yokomo's and HPI's. Others have different ways, this is just how I do it.
Arun uses grease on the gears, and he has more spin than me. So if you still don't have the spin you want, try out grease, it's working for him.