1406 4 pole 4600kv

[bruce750i]

It's a 2wd Slash, without diff fluid. The tire that breaks traction first will get all that 1406 power.

Originally Posted by bruce750i

It's a 2wd Slash, without diff fluid. The tire that breaks traction first will get all that 1406 power.

I just took the diff apart and it still had most of the fluid I had put in previously. To experiment I put in some HPI diff grease and buttoned everything up again.

On this test run, the problem wasn't as pronounced as before on the throttle, but it was still there. It was especially noticable when braking hard. The left rear tire would lockup but the right would continue to roll. This would cause it to swing left during breaking.

This is going to make driving it in the dirt tricky.

ben

[slimthelineman]

Sounds like your diff is not working properly at all. Under braking if one tire locks up the other should do the same cause the motor won't let anything spin. The fact that one tire still spins is highly irregular. Check your susp for binding and make sure your right side slider is not stripped or the axle pin has not sheared behind the hex. The 1406 put out crazy power and is capable of destroying said parts. I'm still waiting for cc to release the rebuilds so I can get a new front endbell on mine and put it back into my lcg slash for more punishment.

Originally Posted by slimthelineman

Sounds like your diff is not working properly at all. Under braking if one tire locks up the other should do the same cause the motor won't let anything spin. The fact that one tire still spins is highly irregular. Check your susp for binding and make sure your right side slider is not stripped or the axle pin has not sheared behind the hex. The 1406 put out crazy power and is capable of destroying said parts. I'm still waiting for cc to release the rebuilds so I can get a new front endbell on mine and put it back into my lcg slash for more punishment.

I'm at a complete loss. The 2WD Slash is kicking my butt with this issue. I just checked the axles and pins on the hexes and they are good. No binding in the suspension. The diff gears are all in tact too.

On the bench everything looks like its supposed to, but of course not while driving. I'm having to run the slipper pretty loose to keep it from stepping out while on the throttle. And as I already mentioned, the braking is also making it step out.

ben

[slimthelineman]

Try this, hold the spur and spur side tire and try to turn the left tire. If it turns your diff is shot. If it doesn't spin your diff is good and the problem lies elsewhere. Could be any number of things such as balance, preload on your shocks etc. Asphalt is not really a good testbed for offroad setups IMO. Tighten up your slipper and take it to the track for testing. Honestly I think your just diffing out due to the light oil or grease you have in there. I run 30k in my flm diff and it's still a bit light but gives me the best balance for my driving style. Kinda tough to work with the stock diff but try to find some of ofnas diff grease in 30-50k. Should really help with all that power your 1406 is putting out.

Originally Posted by slimthelineman

Try this, hold the spur and spur side tire and try to turn the left tire. If it turns your diff is shot. If it doesn't spin your diff is good and the problem lies elsewhere. Could be any number of things such as balance, preload on your shocks etc. Asphalt is not really a good testbed for offroad setups IMO. Tighten up your slipper and take it to the track for testing. Honestly I think your just diffing out due to the light oil or grease you have in there. I run 30k in my flm diff and it's still a bit light but gives me the best balance for my driving style. Kinda tough to work with the stock diff but try to find some of ofnas diff grease in 30-50k. Should really help with all that power your 1406 is putting out.

Well, it passed that test too. Just did it now.

I had put in 50,000 wt diff oil before putting the motor in, and it was still acting like this. I only changed it back to grease to try and return to what worked before the motor swap.

I'm going to take it behind my house and play in the dirt a bit, see how it acts.

ben

ben

I just ran it in the dirt. Good news is the motor temp was only 125 degrees and that is all out on some dry dirt in 90 degree ambient air.

It behaved much better in the dirt. Still using the stock tires too, saving the new rubber for the track. I didn't get to experiment with the slipper because I ran out of juice before I decided to try. It will still step out on the throttle or on the brakes, but not really anymore than I'd normally expect with a 2WD.

I feel like an idiot testing on the street and allowing that to confuse my results.