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L.S.D. vs. Single Spinner - loss of power 

 

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 Post subject: L.S.D. vs. Single Spinner - loss of power
Posted: Wed Apr 27, 2005 1:17 am 
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Which type looses more power in the driveline?

i.e., say I've got 2 identical cars, only difference being that one is LSD one is open wheeler, now if neither of them breaks traction will either have an advantage?

like you how people say an auto car looses 30% power in the driveline while a manual 20% or what ever. Are diffs like that, do LSD's loose more power in the driveline than singles because there turning two wheels or is the difference minimul to none?

 

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 Post subject: Re: L.S.D. vs. Single Spinner - loss of power
Posted: Wed Apr 27, 2005 1:32 am 
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twr7cx wrote:
like you how people say an auto car looses 30% power in the driveline while a manual 20%


is that true?
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would that mean my falcon is 120 odd at the wheels?

 

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Posted: Wed Apr 27, 2005 1:36 am 
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Mate if your not breaking traction then there will be no difference.
I don't think the power losses would be any different either.

 

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 Post subject: Re: L.S.D. vs. Single Spinner - loss of power
Posted: Wed Apr 27, 2005 2:03 am 
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chunkz wrote:
is that true?
cool as


would that mean my falcon is 120 odd at the wheels?


Those are just rough figures that I've picked up reading other stuff - it'd varyuon each individual car and different models and what not i'm sure.
But I don't see how it can be a set percentage. I mean there must be a point were it changes that.
E.g. say my car has 100kw's now, it'll only have 70 on dyno.
So i mod it and engine has 500 now, i doubt that it's still going to be loosing the exact same percentage and that.
but it's debatable. fact is that auto's loose more power in the drive line than manuals.

 

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Posted: Wed Apr 27, 2005 2:09 am 
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Yeah it's not a set percentage, god thats an annoying f**k myth ay. Your exactly right twr7cx!

 

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Posted: Wed Apr 27, 2005 2:35 am 
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yeh i figured it wouldnt be an exact percentage...

but wouldnt they have figured that with stock (or close to stock)
that 30% is a good round about figure.... just for working it out in your head...

kind of thing, its hard to explain what im thinking :?

 

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Posted: Wed Apr 27, 2005 9:37 am 
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there is no power loss from single spinner->LSD

 

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 Post subject: Re: L.S.D. vs. Single Spinner - loss of power
Posted: Wed Apr 27, 2005 11:27 am 
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twr7cx wrote:
Which type looses more power in the driveline?

i.e., say I've got 2 identical cars, only difference being that one is LSD one is open wheeler, now if neither of them breaks traction will either have an advantage?


If there is a slight difference in the tyre OD's ie ones worn out more than the other, or your going around a slight bend, there will be a slight power loss due the the friction resisting the wheel speed differental between the two axle speeds in the LSD hemi. But bugger all.

 

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Posted: Wed Apr 27, 2005 1:46 pm 
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Like everyone above has said - there's virtually no difference in the power the two types of diff "soak" up.

One thing to bear in mind is that a "single spinner" or "open centre" - ie. non-LSD differential does NOT just drive one wheel - both LSD and non LSD diffs drive BOTH wheels - the difference lies in the fact that if a non-LSD diff loses traction on one side then that side will spin and drive force will be lost from the other side (that's the "single-spinner" name origin) - whereas the LSD internal mechanism reacts to a spinning wheel by clamping/braking the spinning side which forces the drive to transfer more across to the other non-spinning side - this is a dynamic process where the drive force ends up modulating between the two wheels and can result in better transfer of power to the ground than a non-LSD setup.

In actual fact you could argue that LSD actually fits the "driving one wheel" description way better than the description fits non-LSD diff - ie. LSD mostly drives the wheel with least slippage.

In both LSD and non-LSD if there's no slippage then both wheels are driven equally.

 

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Posted: Wed Apr 27, 2005 11:35 pm 
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Yeah, I knew all that Green, but you know how most people react better to the terms LSD and single. Cheers anyways mate. Basically my questions been answered!

 

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 Post subject: Re: L.S.D. vs. Single Spinner - loss of power
Posted: Thu Apr 28, 2005 8:28 pm 
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Slightly OT..

chunkz wrote:
twr7cx wrote:
like you how people say an auto car looses 30% power in the driveline while a manual 20%


is that true?
cool as


would that mean my falcon is 120 odd at the wheels?


my EL has 120kw at the wheels, so ya.

 

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Posted: Thu Apr 28, 2005 9:49 pm 
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i could be a bit less because mines only got
au intake and k&n panel filter

you got new exhaust?

 

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Posted: Fri Apr 29, 2005 12:51 am 
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Its got an old cat back system, and a paper element air filter with 32,000+ km of dirt in it :)

 

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Posted: Fri Apr 29, 2005 1:00 am 
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thats pretty sweet then
end of year comes think i might be getting dev1 kit :D
be interesting to see what i get then

 

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Posted: Mon May 02, 2005 1:21 am 
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if it was a locked diff vs an open diff then the locked diff would lose more power through centripetal motion (the same thing that makes fitting lighter wheels and lightening other rotating mass worthwhile). but seeing as neither the lsd or open diff has brocken traction in this situation then they would effectively be the same i think?
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