FREQUENTLY ASKED QUESTIONS ANSWERED BY DAVE
"THE DIFF DUDE" IRRGANG
1. Why do you sand your diff rings instead of
polishing them?
R/C differentials are a friction style
differential. The diff balls (we suggest our grade 25 diff balls
P/N IRS204) need to grip the diff ring to work efficiently. If you
polish the diff rings, the diff will slip and therefore be less
efficient. Roughen the diff rings with sandpaper to create more
grip for the diff balls. By using this method you should not have
to over tighten the diff nut to stop the spur gear from slipping,
this is when most diffs are damaged.
I suggest you try this experiment if you don't
believe me. Build a diff polishing the diff rings and feel how it
works. Then build a diff using the method described in question #2,
You'll feel a definite difference. As an added bonus, when the
rings start to wear, resand and reuse.. You'll get more races out
of the same rings and they get better each time you sand them! This
trick will work on all ball differentials.
2. How do you sand your
diff rings?
I place a sheet of 600 grit wet/dry sand
paper ( for 1/8" balls) or 800 grit wet/dry sand paper (for
3/32" balls) on a flat surface. Place the rings on the sand
paper and using your fingers or our Diff Sanding Tool P/N IRS509
and sand the shine off the rings. I do both sides but you only have
to do the side facing the diff balls. I make sure they're clean and
free of any debris and making sure no excess diff lube gets on them
when I put my diff together. (Use only a small amount of diff lube
on each diff ball)
3. What do your diff rings called the BLASTERS
do?
The Blasters Diff Rings (P/N IRS511B -
standard size & P/N IRS526B - stealth size) have one side
that's etched. This is to get more grip against the axle flange on
a pro diff or the o-rings on our Ultimate Diff. I sand the diff
ball side (shiny side) per the method described in question #2 so I
get good grip on both sides.
4. What is this
"Ultimate Diff o-ring Assembly about?
The Ultimate diff was developed to be the most
efficient diff on the market. There is an o-ring between the axle
flange and the diff ring to prevent the diff ring from slipping.
The o-rings were developed for our diffs out of a specific material
to create the highest co-efficient of drag possible. If you don't
like the hassle of gluing or pinning your diff, here's the answer
to your prayers. This system also helps your diff parts last longer
because of the cushioning of the o-ring. The "trick" to
setting up an Ultimate diff is in the cleaning of the assembly. The
directions that come with the kit are specific, and if followed
completely, you'll have the smoothest diff on the market today.
Using our BLASTER Diff Rings and sanding per question #2 will make
this diff work even more efficiently.
5.I lost my directions for assembling the Ultimate Diff. Can you give
them to me?
Here's how to prepare the Ultimate diff for
assembly.
BEFORE ASSEMBLY COMPLETELY CLEAN ALL
SURFACES THAT COME IN CONTACT WITH THE O-RINGS. USE MOTOR SPRAY ON
THE METAL PARTS, PAYING CLOSE ATTENTION TO THE O-RING GROOVES. USE
A PAPER TOWEL OR Q-TIP TO RUB OUT ANY DIRT OR GREASE IN THE O-RING
GROOVE. CLEAN THE O-RINGS WITH CLEAR ALCOHOL OR WARM WATER. (SOME
MOTOR SPRAYS CAN ATTACK THE O-RING MATERIAL). USE 600 GRIT SAND
PAPER TO SCUFF THE DIFF RING SURFACE. THIS CREATES MORE DRAG
AGAINST THE O-RING.
DURING ASSEMBLY THE ONLY PLACE DIFF LUBE IS
REQUIRED IS A MINIMAL AMOUNT ON THE DIFF BALLS ONLY.
ASSEMBLE PER DIAGRAM AND SET DIFF ACTION TO YOUR PREFERENCE. IF
AFTER ASSEMBLY THE DIFF RINGS SLIP, REPEAT THE CLEANING PROCESS.
6. Please explain why your diff nuts don't have
any threads?
Our posi-lock diff nuts (P/N IRS203) self
thread. They follow the threads of YOUR axle and fit better and
hold tighter because of this. It's still a good idea to change your
diff nuts on a regular basis. Available in 6 different colors, they
can match your paint scheme or your mood.
7. How much diff lube do you use when building a diff?
I take a small amount of silicone
diff lube and place it between my
finger and thumb and lightly coat the diff balls with the lube -
that's it - nothing else should have diff lube on it. Often when
I'm racing and someone comes up with a bad diff, I find the thing
just busting out with diff lube. This collects dirt and shortens
the life of the diff.
8. Why is it when I just rebuild my diff, it
still feels rough?
A common problem is the outer bearing in the
drive hub is damaged, causing a rough feeling. This has also
happened with diffs that have new bearings installed. A solution is
to replace or swap the outer bearing with one of the other new
bearings and most of the time your problem will be cured.
9: Can the IRS graphite stiffening kit be used on the stock
chassis?
Yes, P/N IRS155 will work on the stock TC3 tub chassis, but the most
benefit will come from the increased adjustability using the IRS150
graphite chassis. With these stiffening braces you could remove one or
more center brace stand-offs or even the entire center brace depending
on your application. We feel the most benefit will come on carpet, foam
tire tracks, but they definitely could be beneficial on other tracks.
10: Silva 12th T-Plate Exploded
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