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Old 04-28-2009, 11:03 PM   #1
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Default Is LSD same as Ball Diff?

Im just curious...

I mean, if I'm using ball diff which is partially tightened,
do I experience the Limited Slip Diff effect?

Is LSD good for 4wd or front wheel drive or rear wheel drive?
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Old 04-28-2009, 11:14 PM   #2
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Originally Posted by Airflow View Post
Im just curious...

I mean, if I'm using ball diff which is partially tightened,
do I experience the Limited Slip Diff effect?

Is LSD good for 4wd or front wheel drive or rear wheel drive?
A ball diff behaves more or less in the same way as a limited slip diff. The "limited slip" effect can be adjusted by running the diff tight or loose. Most people prefer a loose (free) diff.
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Old 04-28-2009, 11:33 PM   #3
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Originally Posted by Dragonfire View Post
A ball diff behaves more or less in the same way as a limited slip diff. The "limited slip" effect can be adjusted by running the diff tight or loose. Most people prefer a loose (free) diff.
loose diff wont cause d car lose acceleration speed?
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Old 04-29-2009, 12:05 AM   #4
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Of course a loose diff will affect the acceleration, because there will be no enough friction to prevent the diff from spinning, i.e. the power will not be completely transferred to the drive shaft. I guess what he meant was under the same condition, people prefer to have a little loose diff so that the differential function can work freely.
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Old 04-29-2009, 01:36 AM   #5
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Originally Posted by 05forfun View Post
Of course a loose diff will affect the acceleration, because there will be no enough friction to prevent the diff from spinning, i.e. the power will not be completely transferred to the drive shaft. I guess what he meant was under the same condition, people prefer to have a little loose diff so that the differential function can work freely.
ok thanks

tight diff give more steering than loose diff rite?
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Old 04-29-2009, 02:23 AM   #6
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ok thanks

tight diff give more steering than loose diff rite?
Yes and no. Sometimes a tight diff gives more steering and sometimes it dosen't. I find a tight diff works better in high grip and a free or loose diff works better in low grip. Generally you start with it free (just tight enuf to resist slipping under normal loads) and tighten up a bit at a time if you think you need it.
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Old 04-29-2009, 02:25 AM   #7
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Ok. Let me get this straight, it's preferred to use a little loose diff
setting? Won't it defeat the purpose of LSD? So a normal differential
would be better? Like the gear diff of a TT01? Why is that LSDs
are used in race cars anyway when an ordinary diff (loose) is preferred?
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Old 04-29-2009, 05:36 AM   #8
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@Airflow

it depends where you will be putting your diff. if you'll be placing it up front, most of the time racers prefer it to be a little tighter than usual. if you'll be using it for your rear, it's almost always set to loose to prevent your car from spinning under high acceleration.
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Old 04-29-2009, 06:49 AM   #9
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I was going to say whatever you do if you want to bias your diffs make sure always that you have more traction (in the diff) up front than rear, never the other way around.
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Old 04-29-2009, 08:44 AM   #10
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Originally Posted by Minami View Post
@Airflow

it depends where you will be putting your diff. if you'll be placing it up front, most of the time racers prefer it to be a little tighter than usual. if you'll be using it for your rear, it's almost always set to loose to prevent your car from spinning under high acceleration.
if loose, i think d tyre wont spin but the diff is slipping tremendously rite?...
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Old 04-29-2009, 09:01 AM   #11
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Originally Posted by niznai View Post
I was going to say whatever you do if you want to bias your diffs make sure always that you have more traction (in the diff) up front than rear, never the other way around.
For stability reasons.. that's always the way to go. However it works just like a real car.. get that front too tight and you will start to understeer somethin aweful. This is especially true under power.
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Old 04-29-2009, 09:11 AM   #12
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Here's some info on LSD:

http://www.usdoj.gov/dea/images_lsd.html
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Old 04-29-2009, 09:15 AM   #13
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Quote:
Originally Posted by jhwnissan View Post
For stability reasons.. that's always the way to go. However it works just like a real car.. get that front too tight and you will start to understeer somethin aweful. This is especially true under power.
Absolutely. A very good analogy is to think what happens when you lock the diff on a real car when it's RWD and then FWD and this will actually give you a good idea about two extreme points of adjustment. You need to be somewhere inbetween depending on your conditions.
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Old 04-29-2009, 09:18 AM   #14
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Yeah.. it's so funny how even on this scale.. you can tune these cars like you would work on a real car. They essentially act very similar minus aero which isn't quite the same given scale and viscosity of the air.
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Old 04-29-2009, 11:00 AM   #15
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But it amazes me how a front spool works for RC. If you think in terms of real cars, you would never attempt to use a locked diff for the front.
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