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Old 04-23-2008, 01:23 AM   #1
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Default Losi limited slip?

Hi again,

I have an old Team Associated buggy with various parts including Losi stuff. My main question is regarding the following pics. I'm not sure of the rear diff, other than its a Losi. I took it to a local shop, where the young guy thought it was some sort of older Losi limited slip, which makes sense after I tore it down. The main gear (name?) had some bad wear, but I ran it for a bit until it totally stripped out tonight. Upon inspection, there is what appears to be a clutch and plate, along with the spring and such. Anyways, if I could simply replace that gear, I'd think I'm good to go, but I can't seem to find one anywhere so far. That shop couldn't source it, nor could searches of Losi's site nor others. Its going to be old vintage, at least 1993 or prior, so who knows. Maybe I'll have to replace the whole diff? If so, does anybody know what will fit easily, if anything? Please advise, thanks!




(This, of course, is the gear I'm referring too)
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Old 04-23-2008, 02:47 AM   #2
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Hi
That unit is called a Losi "hydra drive".The gear that's worn (stripped) is a "Spur" gear. What you need is a new spur gear for a losi hydra drive conversion (the original car (rc10) didn't come with that hydra drive unit, It was an after-market add on). getting one of these spur gears may prove difficult (try Ebay after you surf Losi's site for the part number).
All the above is one way of doing it, The other way is to get rid of the whole hydra drive unit & replace it with the original slipper assembly, this is a more expensive route but it will be infinitely easier to get the parts & the spur gear when it wears out eventually.
Oh yes it's not a limited slip diff (it's not a diff at all), It's a tourque converter, but in this case it works as a slipper.
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Old 04-23-2008, 07:22 PM   #3
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That spur gear and Hyrda Drive were standard on the Losi XX Kinwald Edition. If you find XX parts you may find a spur. They should come in 78, 82
84, 86, 88 tooth versions (I think). I believe the colors were white, yellow, purple, red, green. My memory may have failed me and there might not have been an original 78 or 88. They may come later and not been for the Hydra Drives.
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Old 04-23-2008, 07:24 PM   #4
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you can just build the slipper like the XXX cars by buying another plate, different spur and pads. look at a parts diagram for any of the xxx cars.
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Old 04-23-2008, 08:39 PM   #5
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Ah memories. These were sweet on really rough tracks. Debuted under much secrecy at the 1991 Worlds. Kyle Reed would gain several feet on Masami every lap through the whoops, it was incredible. But not enough to beat the Master overall. With modern blue groove tracks they became known as Hydra Bog and fell out of favor.

The idea was to run the friction pad slipper really loose, the hydra drive acts as a torque converter to keep from burning up the friction slipper. And absorb bumps, landing from jumps without getting the car out of shape and stuff. Then at some point the friction slipper would lock the whole thing up at speed. Just like a torque converter with lockup on a modern automatic transmission. You tuned it by using different viscosity silicone fluid in it. Pretty incredible scale technology in my opinion. When they came out that was still kinda exotic on full size cars, the lockup part, pretty standard stuff nowdays.

Part numbers A 3904 through A3910, maybe more. I found this site by Googling "hydra drive spur gear", don't know if they are in stock:

http://www.eagledist.com/teamlosi.htm

Thought I might have an extra myself, but at first glance I don't seem to.
Good luck.

Last edited by Dave H; 04-23-2008 at 08:53 PM.
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Old 04-23-2008, 11:31 PM   #6
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Nice, thanks. I was searching that site (Eagle Distributing) earlier, but wasn't sure what part # to look for. I took it down to the local shop today, but the guys might have well thought I was straight off a saucer from Mars.

Building the rear like a newer car sounds interesting too, I'll have to check that out. Mine has 84 teeth, but is black. Hmmm...

I mildly cleaned up the really bad areas tonight *gasp* and spaced the pinion gear over just enough over to test things and mostly align the front end, which is WAAAY out. I'll search around for the parts. Thanks a ton, and please continue to post if you have any further ideas or insight. I'm trying to soak it all up.
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Old 04-24-2008, 05:57 AM   #7
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Mr. Pickles, i`ve been racing for 20 years now, and used to run the same setup in my RC10. I think I actually have 3-4 of those spur gears in my box still. I also have an original hydr-drive unit too. I`d be willing to send you what I have (no charge) Just pay the shipping if any. You can get in touch with me. I`m in Salem,NH.
[email protected]

Thanks
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Old 04-25-2008, 03:52 PM   #8
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The black 84 tooth gear was probably an aftermarket by Kimbrough. I ran some of those myself.
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Old 04-25-2008, 11:05 PM   #9
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Cruzen chris, thanks! *email sent*

nutz4rcyktw

Thanks, I'll look into that. My spur gear has 3 studs/pegs on the side where it engages the metal plate and the clutch disk/slip disk -looking thing. That's what has thrown me so far. I found the same diameter spur gear at the local shop, with the same 84 teeth, and I was getting ready to play Franken-gineer. But it sounds like cruzen chris has the holy grail.
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