Still trying to set mad rat diff

[minke]

I've done some searching here and still cant get the diff set up correctly on my mad rat. I have major slippage issues.
I thought it was the slipper clutch at first, so tightened it full and was still getting slippage. I tightened the diff screw to the point where when i turn a rear wheel, the opposite one won't counter-rotate. I still have slight slippage with this set up I just can't find the sweet spot. I can't identify which noise is the diff and which is the slipper either. getting frustrated with this now.

[Matt Airbrushing]

It sounds like you may have everything too tight.

Firstly loosen the diff untill its reasonably smooth when you rotate the wheels.

The way I set the slipper is to take the gear cover off and then when sitting down hold the right rear wheel between your legs so it cant move.
Then hold the spur gear using your left hand and turn the left rear wheel with your right hand.

You need to set the slipper so that the layshaft turns around and the slipper slips.

If the wheel turns and the layshaft stays still then the diff is slipping and you need to loosen it off a bit more (the slipper)

Doing it this way also gives you a feel for how tight things really are, if its very easy to slip the diff then tighten it up a bit. If its very hard to make the slipper slip (even if the diff is holding) then you will need to loosen the slipper to prevent the car doing wheelies.. you may also want to losen the diff to make its action smoother.

If you have raced the car with the diff slipping you may need to replace the diff balls and plates as they might have worn out.. Im not a madrat expert but another member should be able to recomend parts to use (it might be better to upgrade these parts than use madrat ones)
There are also upgrades that can be done to the madrat slipper to make it easyer to adjust.

With a 6.5 motor you will want to slipper to be reasonably loose to keep the power on the track. Many "beginners" set there slippers too tight and then damage diffs.

[nicefrog]

Having just replaced the diff in mine I can almost be sure you have the same issue, broken thrust balls. If you remove the diff adjusting screw and the thrust bearing you can easily check them to see if they are all there or some have been crushed. The easy way out for me was to buy the complete B-Fast pro kit which is proving to be a much stronger bit of gear

http://www.bfastrc.com/tqracing.html

Here's the link for it, otherwise you could just get new thrust bearings and build the diff really carefully next time but meh, for the small price difference you might as well get the Bfast kit and be done with it

[minke]

re adjusted again feels much better, still have some noise issues. I'll post a vid from my back garden shortly it should record the noise made.

[zagonielod]

I got this from a friend.

[minke]

Thanks everyone, got it up and running and its running sweet. I took the diff apart, ball bearings all a ok. I put some new spare diff washers in anyway, regreased with hispeed diff grease and started again. Set it up again and very pleased with result.

I dont think I need any more upgrades besides maybe a motor mount and hobbypro front wing, just need to beat the B4 guys now.

[minke]

I decided to get the bfast diff kit as well as a few aluminium upgrades. I even bought the front wing to try to help get the front down. Very pleased with the result.

I still have a couple of issues however, firstly the car rolls over unpredictably at a variety of speeds. I dont have a particularly fast servo its just the rolling over screws up my lap times.

Secondly I enter jumps with crossed fingers, It'll either stay more or less level or simply nosedive and forward flip itself upright. I havent raced with the upgrades yet so I'll see how the brass weight in the front affects things