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Old 12-02-2007, 12:48 PM   #31
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Quote:
Originally Posted by Skiddins View Post
My Mi3 diffs;

HD Spool - 21.3g
Ball Diff - 24.3g
One Way - 27.5g

Over 6g difference between a spool (the heavy duty one) and the One-way, and no-one bothers to think about the difference in weight between those two when setting up their car.

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Good point .
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Old 12-02-2007, 01:06 PM   #32
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An open gear diff has ZERO limited slip effect. If one wheel loses traction that end of the car loses all forward drive. That slows you down a lot. That is why no one that was fast at the time used the MIP gear diff and it was discontinued.
This is true. Delta even had a gear diff for their 1/12 car back in the '80s. When the car was right, the gear diff was better, but any wheel lifting ruined you.

But I think the fluid diff may be something to look into simply for its ease of use and repeatibility. And as new battery and motor technology makes its way into electric racing, the extra weight may be a non-issue.
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Old 12-03-2007, 10:52 AM   #33
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Modified touring now has too much power and too much grip for a ball diff.

It is good to see Serpent stepping up and releasing this "old-tech" part which I am sure will outperform a ball diff and be a lot easier to work with too.

I'd like to see more.
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Old 12-03-2007, 03:48 PM   #34
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This is a very interesting idea. I really like having gear diffs in my 1/8 scale for all the reasons being mentioned. It'd be nice to have that in a TC. TC's are so sensitive to diff condition. If you have a diff get chunky in the middle of a run, you can feel the car go away. That wouldn't be an issue with this. Also, like Rick said, 5 grams in the drive train is nothing when you're running mod. You'd probably gain more time on the track with the consistency than you'd loose in the weight. Hell, we used to add weight to the diffs/spools on the old Losi XXXS by running steel out drives to increase grip.
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Old 12-03-2007, 04:11 PM   #35
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According to the Serpent website, the gear diffs are 5 grams heavier than the ball diff, it does not say if this is with fluid or not.....
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Old 12-03-2007, 05:23 PM   #36
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Isnt that a torsion diff?
Nope, this is a TorSen , or something like the latter (Quaife ATB Helical LSD) ;
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Old 12-03-2007, 07:15 PM   #37
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The one on the left is a standard clutch-style LSD, the one on the right is a Torsen-style diff.
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Old 12-04-2007, 04:12 AM   #38
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***edit*** Didnt notice the last few posts so this is a little late.

Quote:
Originally Posted by protc3 View Post
Isnt that a torsion diff?
No, this is:



Hpi has gear diffs that are adjustable by a tiny spring.

The spring was inbetween the smallest gears pushing them against the housing, causing friction.
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Old 12-04-2007, 06:43 AM   #39
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Quote:
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The one on the left is a standard clutch-style LSD, the one on the right is a Torsen-style diff.
No, the upper one is a clutch type (you can see the black material), the lower left if torsen, the lower right is a Quaife LSD, it's mechanical and 'similar' to a Torsen.

But either way, if any other type of diff appeared for my car I would be willing to try it.

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Old 12-04-2007, 07:18 AM   #40
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Ever seen these diff's, www.bbfmodels.com
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Old 12-04-2007, 09:48 AM   #41
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Quote:
Originally Posted by Skiddins View Post
No, the upper one is a clutch type (you can see the black material), the lower left if torsen, the lower right is a Quaife LSD, it's mechanical and 'similar' to a Torsen.
Ummm...no.

A Torsen-style diff uses worm gear principles (you can drive through one gear of a worn gear set, but not the other) to make a continuously torque-biasing (not locking) axle. They don't use the clutches that you can clearly see in that picture.



Also, Torsens don't have side gears...
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Old 12-04-2007, 10:28 AM   #42
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Save a lot on diff rebuilds and can handle the torque of a brushless.

Mod racers dream.

And even in stock the rotating mass is better for cornering, its all about keeping the car rolling.
I hope that some ones gets this going. Is any one selling this in a kit or just as a hop up.?
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Old 12-04-2007, 10:48 AM   #43
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Save a lot on diff rebuilds and can handle the torque of a brushless.

Mod racers dream.

And even in stock the rotating mass is better for cornering, its all about keeping the car rolling.
I hope that some ones gets this going. Is any one selling this in a kit or just as a hop up.?
For sure and exactly what i was thinking.
Im actually checking out 200mm diffs to see if i can make a conversion.
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Old 12-04-2007, 12:41 PM   #44
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Quote:
Originally Posted by Turbo Joe View Post
Ummm...no.

A Torsen-style diff uses worm gear principles (you can drive through one gear of a worn gear set, but not the other) to make a continuously torque-biasing (not locking) axle. They don't use the clutches that you can clearly see in that picture.



Also, Torsens don't have side gears...
Whoops, that was a 'Locking' diff , got my pictures confused


But I still want one for my car
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Old 12-04-2007, 01:01 PM   #45
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Whoops, that was a 'Locking' diff , got my pictures confused But I still want one for my car
DOH!

That's cool...
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