diff oil weight for Hyper 7 PBS

diff oil weight for Hyper 7 PBS
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC 1/8th Scale Buggies >> diff oil weight for Hyper 7 PBS

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diff oil weight for Hyper 7 PBS - 11/13/2003 5:11:22 PM

royta

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From: Corona, CA,
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I'll be recieving my Hyper 7 PBS this coming Wednesday. It is my understanding that the diffs only come with grease in them. It is also my understanding that it doesn't take long before the grease disappears. Therefore, I'd like to put oil in the diffs before the first run.

First of all, do I need to remove all traces of the existing grease, just wipe off as much as I can, or can I just add oil on top of the grease?

Does the oil go in the actual diff itself?

Or does the oil go between the case and diff?

OK, now let's get to oil weights. I would like a neutral running buggy, but I think I'd rather err towards a setup for a track with sharp twisting corners than a wide open track with gradual corners. Since I'm a newbie to 1/8 scale buggies (I've run an electric RC10 buggy and a Losi GTX stadium truck), I obviously don't want the buggy too squirrely.

I was thinking 3 - 7 - 1 from front to back, but of course I'm certainly not an expert, so I would like your opinions on the best starting setup.

Thanks for the help.

Roy

Post #: 1

RE: diff oil weight for Hyper 7 PBS - 11/13/2003 5:21:58 PM

Nitroaddict

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roy - okay. heres the scoop.

1. Removing all of the grease isnt manditory, but get out as much as u can. simply squirting some nitro cleaner inside the diff will help get it all out.

2. you have to open the dif itself. this is where the oil goes. fill it almost to the top and secure completely. make sure u spary the outer parts of the diff with nitro cleaner, to remove any oil that has leaked out. it will attract dirt.

3. For a std buggy track here is what i use:

Front - 10,000wt
Center - 5,000wt
Rear - 7,000wt

This setup has worked great for me at 90% of the tracks i race at. if im racing at a very small 1/10th size track, i might drop to 5,000-1,000-3,000 - but it better be TINY.

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 6:16:47 PM

had enough

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Wow nitroaddict that a thick pizza pie?
Why do you run the center so loose?

I run 5-7-1 in my h7

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 6:18:48 PM

Nitroaddict

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the tracks down here in FL are pretty dusty and loose, scale - so i like having the center loose and able to transfer power easily. plus, with the center diff that loose, and pretty much makes the buggy rear wheel drive when accelerating, and this make coming out of the corners alot faster.

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 6:26:42 PM

royta

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What type of driving is your 5 - 7 - 1 setup tuned to scale_only_4_me-RCU? Where do you run at? I've heard that Revelation Raceway is best track near us. I could probably get there in 30 minutes from my house. I'd like to tune my PBS to that track if it is the best. I've heard good things about The Dirt in Hemet, but that's farther than I'd like to drive. I've never raced, but the idea sounds fun. However, my wife will probably kill me since I already have to many hobbies as it is.

Thanks.

Roy

< Message edited by royta -- 11/13/2003 10:27:30 AM >

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 6:30:40 PM

royta

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Nitroaddict - Nitro Cleaner? Is this anything more than glorified carburetor cleaner, or electrical contact cleaner? What about using denatured alcohol? I won't be using brake cleaner because that's a lot more agressive.

Thanks.

Roy

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 6:33:31 PM

Nitroaddict

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Roy - yes, when i refer to nitro cleaner - i mean denatured alchohol.

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 7:17:59 PM

dagass

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I run 5-7-1 also (per the Ofna manual) at our indoor track. It's tight, technical and there is a lot of traction. I've found this setup to be ok on surfaces that don't have a ton of bite to them, but on a short, tight track, the low speed steering is less than perfect. The car has a tendency to push wide exiting the turns. I've had somebody suggest that 3-3-1 or even 3-5-1 might be better for my particular situation.

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 8:11:45 PM

royta

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Oh what do you know dagass? All you do is hit ramps anyway.

Seriously though, thanks for the advice. It almost sounds like setting up for a tight, twisty track would work in ALL scenarios. The car might not accelerate as fast as the cars with thicker diff fluid, but it wouldn't hurt you though would it? I guess the car would be a little tough to control though. Am I correct in this thinking?

Roy

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 8:21:39 PM

Nitroaddict

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yes - the generic reasoning is that the thinner the oil the better the car will turn, but the more difficult it will be to drive. u will also have a greater chance of diff unloading

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 8:23:42 PM

dagass

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One thing I can tell you for sure Roy, is that the 5-7-1 works GREAT on the ramps!

After this weekend, I suspect there will be a whole lot less "rampin" and a whole lot more "racing".

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 10:28:33 PM

royta

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Nitro Addict - Exactly what is diff unloading?

I tried four different drug stores all withing 300 yards of my work, and none of them had denatured alcohol. Where can I get that stuff and how big a bottle can I get it in? Oh, and how expensive is it?

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 10:34:25 PM

had enough

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quote:

ORIGINAL: royta

What type of driving is your 5 - 7 - 1 setup tuned to scale_only_4_me-RCU? Where do you run at? I've heard that Revelation Raceway is best track near us. I could probably get there in 30 minutes from my house. I'd like to tune my PBS to that track if it is the best. I've heard good things about The Dirt in Hemet, but that's farther than I'd like to drive. I've never raced, but the idea sounds fun. However, my wife will probably kill me since I already have to many hobbies as it is.

Thanks.

Roy

If your just bashing then Nitroaddicts set up might work better for you, since it work well in loose conditions. 5-7-1 is more for a clean wet race track condition

Honestly I'm no pro racer, I use that set up because a few guys I race with that are more experianced recomended it for me, and it's what they run in there H7s.
The loose rear diff helps prevent the rear end breaking loose to easily, I'm told

I don't race my H7 as much as I race 10th scale truck
I mostly race at Hot Rod Hobbies or KZ speedway

If you're in Corona you should try LPRP (Lake Parris Race Park) also, they race Friday night (if enough guys show), Saturaday and Sunday 2pm. The track is right off Romona express way & the 215 right below Lake Perris

Alot of very good 1/8th scale guys there www.lprp.com

Cya

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 10:55:45 PM

lynx the great

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you can get denatured alcohol from places like the home depot, lowes, ect ect

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RE: diff oil weight for Hyper 7 PBS - 11/13/2003 11:59:55 PM

studysession

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In some countries - denatured alchohol not available...

One thing I miss is Home Depot and Lowes.

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RE: diff oil weight for Hyper 7 PBS - 11/14/2003 12:12:09 AM