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View Full Version : s500 - gear diffs?


bigred5765
21-02-2008, 11:29 AM
not sure if it's common knowledge but a little bird just tweeted in my ear it has geared diffs, like rallyx cars and so tunable, is this true, :thumbsup::confused:

Dunc
21-02-2008, 11:34 AM
They have a geared differential for their S400 touring car (see here (http://www.serpent.com/product/401144)), so it's not unreasonable to think they'll do the same with the S500.

I certainly hope that they do :thumbsup:

bigred5765
21-02-2008, 11:36 AM
thats ace thanks for the info

Lee
21-02-2008, 11:47 AM
will it be heavy then?:thumbdown:

bigred5765
21-02-2008, 11:51 AM
New for the Serpent S400 is this innovative 35T rear gear differential. Designed with competition in mind, this new diff is only 5 grams heavier than the standard ball differential yet provides more consistent operation and there is absolutely no slippage, which helps improve acceleration. Another benefit is that it requires little or no maintenance or rebuilding and it can be simply set by just changing the oil. To keep the weight down, the differential is supplied with coated aluminium out drives and to get you on the track as quick as possible, the diff comes pre-assembled, with you only needing to add oil. Expect a front gear differential in the near future

info from serpent site

Inside Line
21-02-2008, 11:51 AM
Is there any advantage to having a geared diff? (doh, Q answered)

bigred5765
21-02-2008, 11:54 AM
endlessly tunable buy oil weight inside, just as in rally x
heaver oil more limited slip action the diff will provide etc and vise versa

RogerM
21-02-2008, 12:09 PM
Now that is interesting.......... !!!!!

Inside Line
21-02-2008, 12:12 PM
Sounds like my kind of car, along with a brushless motor/speedo it will equate to virtually maintanance free racing!!

Why have other manufacturers not gone down this route though?:confused:

jimmy
21-02-2008, 12:14 PM
Ball diffs I think in this car, but they might bring out some geared jobbies later? who knows.

Chris Doughty
21-02-2008, 12:59 PM
who wants a diff in the front anyway....

one-way is where its at!

bigred5765
21-02-2008, 01:06 PM
I'm sure with thick enough oil the effect of a one way can be achieved
after all how many rally x cars have them

Sebastian
21-02-2008, 01:26 PM
From what I've heard it will come with standard ball diffs out of the box but they are working on a gear diff option too.

bigred5765
21-02-2008, 01:36 PM
take a look in dunc's post
i guess they have them already
i know it says s400
but there already made guess a crown wheel change and your off
hope it does come geared diffs

Chris Doughty
21-02-2008, 02:36 PM
I'm sure with thick enough oil the effect of a one way can be achieved
after all how many rally x cars have them

your talking about a spool, either that or I can't figure out how you plan to get the freewheel action of the one-way with gears and thick oil?

also, how many rallycross cars are faster than a 10th scale car, even on 8th scale tracks 10th electrics are normally faster unless its like the moon.

8th cars are so heavy they need something really tough and durable to last the long finals.

I am sure the geared diffs will be quite good, but at no point raicng my 10th cars have I ever though, hmmmm, I would love to make my diff do this but I can't with a ball diff

Lee
21-02-2008, 03:04 PM
your talking about a spool, either that or I can't figure out how you plan to get the freewheel action of the one-way with gears and thick oil?

also, how many rallycross cars are faster than a 10th scale car, even on 8th scale tracks 10th electrics are normally faster unless its like the moon.

8th cars are so heavy they need something really tough and durable to last the long finals.

I am sure the geared diffs will be quite good, but at no point raicng my 10th cars have I ever though, hmmmm, I would love to make my diff do this but I can't with a ball diff

So true, i would never really "want" a geared diff over a ball diff, and i have only ever ran a diff in my 4wd once, 1 way all the way for me:thumbsup:

bigred5765
21-02-2008, 03:09 PM
true
but u can have a centre oneway roller like the bj4
and still have the tuneability of the geard diffs

Lee
21-02-2008, 03:17 PM
I see what your saying carl but its still not a proper 1 way and personally i dont see the advantage of having a geared diff, and all the oil crap would just do my head in:cry:

Dunc
21-02-2008, 04:00 PM
The geared differential I linked to is for the rear of the S400, although the blurb does state "Expect a front gear differential in the near future".

I agree that a geared differential for the front of a 4wd buggy is not much use, given the preference for one-way units, but could be a good idea for the rear (due to the reasons Serpent have outlined).

Chris Doughty
21-02-2008, 04:10 PM
true
but u can have a centre oneway roller like the bj4
and still have the tuneability of the geard diffs

but that is nothing like a one-way diff, both wheels are still joined together by a diff even though they do free-wheel.

part of the fun of the one-way is that both front wheels can free-wheel independantly of each other for maximum rotation and turn-in.

josh_smaxx
21-02-2008, 04:25 PM
How 'open' is the rear of the S500? because if it is (Diff is visible) then i would gladly take a geared diff over a ball diff anyday. I need to rebuild the diff in my S400 every 2 nights, imagine on an offroad track its going to be more then that, geared diff takes all that away.

jimmy
21-02-2008, 04:43 PM
its enclosed (has to be since its gear driven and a tiny bit of debris could knacker it all)
They confirmed it comes with BALL diffs but might (only might) make a geared diff.

mark christopher
21-02-2008, 06:13 PM
will it be heavy then?:thumbdown:
no by much
take a look in dunc's post
i guess they have them already
i know it says s400
but there already made guess a crown wheel change and your off
hope it does come geared diffs
not that easy
So true, i would never really "want" a geared diff over a ball diff, and i have only ever ran a diff in my 4wd once, 1 way all the way for me:thumbsup:

but in the rear!!

I see what your saying carl but its still not a proper 1 way and personally i dont see the advantage of having a geared diff, and all the oil crap would just do my head in:cry:
thats what the electric TC lads said, until they bolted in a geared diff, now all the serpent drivers run em and other manufactures are looking closley
i have used em for years in ic cars, reliable, no slip and very tunable.

bigred5765
21-02-2008, 06:19 PM
for the first time ever i agree with you mark
omg did i just say that lol

mark christopher
21-02-2008, 06:56 PM
Steady on .........................lol

Lee
21-02-2008, 07:02 PM
Thanks for clearing some things up mark but what is the advantage of having one if you already have a well built and functioning ball diff:confused:

bigred5765
21-02-2008, 07:10 PM
as i said lee there more tuneable than any ball diff

HVAC25000
21-02-2008, 07:27 PM
who wants a diff in the front anyway....

one-way is where its at!

Perhaps they also want to sell it in the U.S. where no one runs one-ways? At least on the west coast...

mark christopher
21-02-2008, 07:53 PM
Thanks for clearing some things up mark but what is the advantage of having one if you already have a well built and functioning ball diff:confused:
make it loser than a ball diff with zero slip
make it tighter than a ball diff with out risking bolts snapping, balls flatting or wearing etc

wont go out off adjustment your well built ball diff will

sealed unit (ok it would be in a sealed gear box but the s400 is not) on road is far more finicky than off road (electric) and they are seeing the benifits

elvo
23-02-2008, 03:24 PM
part of the fun of the one-way is that both front wheels can free-wheel independantly of each other for maximum rotation and turn-in.

Couldn't agree more. Real men use one-way diffs :p


Now, in the rear, I wouldn't mind sacrificing a few grammes for an indestructable gear diff.... especially on a shaft drive car. (90 gear reductions make no sense whatsover when combined with a ball diff!)

Northy
23-02-2008, 04:02 PM
Couldn't agree more. Real men use one-way diffs :p


Elvo, what 4wd do you run again? :confused::confused:

:lol::lol::lol:

G

elvo
23-02-2008, 04:21 PM
Elvo, what 4wd do you run again? :confused::confused:
G


Freud's :p

stegger
04-04-2008, 10:53 PM
Question for mark. Have the tc drivers encounted any problems with the new geared diffs? As you have said it's more finiky in a tc so if it's been ok in this then i should imagine it would be ok in the buggy. So looking forward to this car coming out:drool::drool: