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Schumacher Mi4

Old 08-31-2011, 04:05 AM
  #2956  
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Originally Posted by Benzaah View Post
Ive found that minimal grease works better than slathering it in there like in the Grainger Video. Here is a link to a good rebuild article when the Mi3.5 was out. Diff is pretty much the same these days anyway's. I was getting around 30 runs before rebuild in boosted stock doing it this way.

http://www.actionrc.com.au/downloads...ateMi3Diff.pdf

As for the Springs the pro 4 springs are the ones everyone uses. I have found Xray springs much better with either 2.8 all round or 2.8f/2.6r an awesome combo and on my home track kit springs are also faster than the Hpi's. I have found the HPI's to be a waste of my money...
Schumacher whites all the way around works great , I have also used the tamiya yellows for asphalt
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Old 08-31-2011, 10:30 PM
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diff building instructions that were posted a while back that I had saved on another thread...

The following is Diff building tips, it was on the shouie thread but should transfer over to most if not all diffs



Try this and let me know if it helps...

Before starting think of diff building like cooking with chicken. The black thrust lube is the chicken and if you get it on the diff balls, rings or pulley your diff will get sick and DIE!

Before I start I clean EVERYTHING with motor spray.

Before I start I clean EVERYTHING with motor spray.

Before I start I clean EVERYTHING with motor spray.

1. If you havent gotten a U1954 Tungsten Carbide Thrust Bearing get one. Its better then the one inculded in the kit.

Clean it all out and use Schumacher Black Thrust lube. Measure the outside diameter of the thrust washers. The small diameter one goes on the screw first.

Go wash your hands and get every bit grease off your fingers.

2. Sand U2408 diff rings with 600 grit wet dry on both sides using motor spray to wet the paper until you see even scorring of the rings entire surface.

Clean them with motor spray and place them on a clean paper towel.

3. Toss the ceramic diff balls. The U2459 Tungsten Carbide diff balls are smoother and longer lasting. Place the balls on a clean paper towel and CAREFULLY spray them with motor spray to get rid of any protective oil that is on them. If you spray too hard you will launch $15 of diff ball all over you room and they will be gone forever. When they are clean and dry put them in the tub of U1301 Silicone diff grease. Pluck them out and place them in your diff pully. Thats all the grease you will need.

4. Gradually tighten up the diff untill one output starts to spin opposite the other one. Gradually tighten the diff a little then spinn it a little untill you feel the diff screw has colapsed the spring washers next to the thrust bearing and it dosen't want to turn anymore.

The goal is to tighten the diff but not pit your freshly sanded diff rings.

5. Loosen the diff 1/4 turn then lock down the grub screw on the opposite side.

6. Put the diff in your car and turn everyhting on. wit the car up on a car stand. Run the car at low throttle while alternatly touching each rear wheel untill it stops. Repeat this 2-3 time per side.

The diff should be super free, super smooth and should not slip at all.

If you diff slips just once during a race it will score your rings and it will be junk. You will have to rebuild it and flip, resand or replace the rings.

The U1954 thrust will last longer than yuor kit so it will never be the cause of diff problems. The U2459 ball will survive at least 6 months or more. The only things that go bad in a diff assembled with these parts as described are the rings and you can resand them several time before you need to replace them.


Adrian Martinez
BMI Racing
bmiracing.com

DB12R NOW AVAILABLE!!
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Old 09-01-2011, 03:15 AM
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"Before starting think of diff building like cooking with chicken. The black thrust lube is the chicken and if you get it on the diff balls, rings or pulley your diff will get sick and DIE!"


Tungsten Carbide balls are better than Ceramic. Good to know. I thought ceramic was the end all and be all of diff balls.

Going to finally get myself a Muchmore bearing remover tool. Been on my "Need" list for far too long. Mi4 hub bearings are 5x10x4 which would make them M5 size correct.
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Old 09-01-2011, 02:09 PM
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i have my gear diffs on the way for the front and rear should have them by tomorow.
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Old 09-03-2011, 05:48 AM
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The gear diffs fit just fine. The belt alignment in the front is good. All I did was I removed a little off the diff case and added another shim in the right side. It's perfect
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Old 09-03-2011, 07:10 AM
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Here is my set up so far , Ran it with the spool in the front and works very well

Testing again tomorow if I make any more changes I will post a new revised sheet.

pm me your email and I will email it to you , file is too big too post
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Old 09-03-2011, 10:40 AM
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this is the best that I can do got it from a snap shot from my IPhone
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Old 09-03-2011, 10:05 PM
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What pinion were you using Marcos? Looking for a good starting point for my FDR running 17.5 on a small carpet track. Will try your setup and see how I like it. Thanks
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Old 09-03-2011, 10:52 PM
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with a 118 spur he must be using boost, and unless your using the same esc and setting his pinion info is useless
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Old 09-03-2011, 10:58 PM
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Originally Posted by skypilot View Post
with a 118 spur he must be using boost, and unless your using the same esc and setting his pinion info is useless
different ESC & Motor but boosted 17.5 on a similar track. Just looking for a good starting point as I have been running un-boosted with my previous TC with an FDR of 5.64 and never ran boosted before.

Last edited by BrodieMan; 09-04-2011 at 03:23 AM.
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Old 09-04-2011, 01:08 AM
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Default Setup using Sweep OG-Spec 40 Tires

Hi all
Has anyone got a setup running Sweep OG-Spec 40 tires in Mod.

Regards Gary
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Old 09-04-2011, 04:34 AM
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Originally Posted by BrodieMan View Post
What pinion were you using Marcos? Looking for a good starting point for my FDR running 17.5 on a small carpet track. Will try your setup and see how I like it. Thanks
I'm running a 32 pinion with the 118 spur

Originally Posted by skypilot View Post
with a 118 spur he must be using boost, and unless your using the same esc and setting his pinion info is useless
Yes I'm running boost , lrp sxx v2 using 11boost
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Old 09-04-2011, 10:32 PM
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Ran the above set up in mod today and it was very good, I ran a 6.5 with a little boost
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Old 09-06-2011, 11:03 AM
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Originally Posted by GSM Storm View Post
Hi all
Has anyone got a setup running Sweep OG-Spec 40 tires in Mod.

Regards Gary
Asphalt or carpet? I ran the above setup with rp 40's on carpet with a sp6.5 and worked very well , I did however changed the front diff fluid to 500,000.





Also I have over 10 PDub hard front bumpers for the mi4/3/3.5 if any needs one send me a pm.
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Old 09-06-2011, 12:58 PM
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Marcos,
those things are as scarce as teeth on a chicken. Could I buy 2 of them? 1 for me and 1 for racer-x.

Rich
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