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Hpi Pro 4


Old 06-24-2004, 01:08 PM
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Default Diff loosening problems

Guys;

While my diff was disassembled to add loctite to the adjusting screw, I thought of something.

The short side from the Pro-3 diffs will fit if you cut/grind down the center bearing support to match.

This would allow you to build the thrust bearing in a more conventional manner with the spring in the outdrive opposite from the bearing.
The screw head would also now be on the opposite side outdrive (from the kit) and I'm not sure if this would lead to other problems.

Has anyone tried something like this and what success (if any) did you have?

Thanks,
Steven
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Old 06-24-2004, 02:10 PM
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Default Thrust bearing

Can you use a regular thrust bearing instead of using the thrust balls and plates for the diff?
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Old 06-24-2004, 02:28 PM
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to who has ordered from PRP.

how long did it take for your orders to arrive? USPS global airmail was the method of delivery and so far after a week no sign of it.
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Old 06-24-2004, 02:31 PM
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Originally posted by racer
to who has ordered from PRP.

how long did it take for your orders to arrive? USPS global airmail was the method of delivery and so far after a week no sign of it.
mine took about 5 days... via reg. USPS mail..
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Old 06-24-2004, 02:39 PM
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Took 4 days to get it my brace to Nebraska.
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Old 06-24-2004, 02:40 PM
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Thanks, rc-zombies & galway

usually it takes about 5 days as well.
starting to worry, cause i also had another item shipped out to the states and it has been close to over two weeks. hopefully none of them will be lost in the mail
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Old 06-24-2004, 03:41 PM
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All this talk about breaking stuff makes me really appreciate the outdoor tracks here in England - grass runoff areas!
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Old 06-24-2004, 03:48 PM
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Originally posted by Frank McKinney
All this talk about breaking stuff makes me really appreciate the outdoor tracks here in England - grass runoff areas!
What no kitty litter?
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Old 06-24-2004, 03:51 PM
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Originally posted by RCBuddha
I think you have it all! You may want to get:

1. new 1.1 version gears
2. HPI Backing plate (if your going to use the oneway)
3. extra arms etc....

You should already be pretty well set-up....
O.K. will do. Thanks
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Old 06-24-2004, 06:32 PM
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Default Thrust bearing

if u can fina a thrust bearing that fits the screw and the outdrives it should be the same as using balls and plates
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Old 06-24-2004, 08:49 PM
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Default Re: Diff loosening problems

Originally posted by popsracer
Guys;

While my diff was disassembled to add loctite to the adjusting screw, I thought of something.

The short side from the Pro-3 diffs will fit if you cut/grind down the center bearing support to match.

This would allow you to build the thrust bearing in a more conventional manner with the spring in the outdrive opposite from the bearing.
The screw head would also now be on the opposite side outdrive (from the kit) and I'm not sure if this would lead to other problems.

Has anyone tried something like this and what success (if any) did you have?

Thanks,
Steven
Pops,

By having the screw head and thrust bearing opposite to the spring and nut, you get the old version of the stealth differential. I know this works MUCH better than how the diff is currently built. I find it funny how I get NO response from HPI in regards to the Diff design. I think this like my fourth or fifth post on the subject; I wonder when they'll get around to answering my question.....

I tried various parts/configurations/combinations with little success. Perhaps you can spend more time trying parts that i didn't....

I think I'll send PRP an email describing the problem, and hopefully, they'll make a solution to it....Seems like HPI isn't....
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Old 06-24-2004, 08:58 PM
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Originally posted by kewdawg
yeah, and that little flanged sleeve for the screw gets broken too.
They should make the hub bushings chrome, get lost on the track easily if you lose a knuckle.

Where I come from, ppl have been losing that often. I've lost one myself too...
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Old 06-24-2004, 09:30 PM
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Do what we used to do with our 1/8th scale front dogbones. Paint the bright orange.
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Old 06-24-2004, 11:42 PM
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Originally posted by Frank McKinney
All this talk about breaking stuff makes me really appreciate the outdoor tracks here in England - grass runoff areas!
My local outdoor track has grass runoff areas too.
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Old 06-25-2004, 03:27 PM
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Default "Custom" Pro-4 diff building

RCBuddha;

I am going to see how well the Loctite works. If the results are not satisfactory to me, then I am going to build a Franken-diff using parts from both Cars.

Thanks for your input,
Steven
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