You have to look at two main things. Auto vs. Manual tranny. In an auto you can use the FWD fuse and it's no big deal the tranny just takes away line pressure to the rear. However you aren't going to really get alot better fuel mileage. The auto tranny legacy's normally run 90/10 split. So normally you are getting 90% power to front. So an additional 10% to front when fuse is in, is not going to give you any better mileage.
As for manual transmission. That just plain will not work. The center diff, the way it works it senses change in rotation between the front and rear drive shafts. If they are the same, the split is 50/50. When the front or rear starts to slip, it spins faster. The center diff wants the other one to catch up, hence transfers power. Let's say you take the drive shaft out. You would then have no rotation in the rear, and rotation in the front. It would want to transfer power to the back, when there is nothing there, it will just fry the viscous center diff.
So in summary. This is NOT a viable option to get better mileage or more power. I have a FWD legacy, and yah I do probably get a little better mileage, but I would rather have AWD, trust me, the safety and performance, far outweighs what little you save in gas.
************************************
Josh Colombo
jcc189@psu.edu
"Life, an ever-changing melody
of beats and rhythm" - ME
************************************
-----Original Message-----
From: D. Doug Mallow [mailto:
ddmallow@yahoo.com]
Sent: Sunday, November 11, 2001 66 PM
To:
BC-BFLegacyWorks@yahoogroups.com
Subject: Re: [BC-BFLegacyWorks] Re: drive shaft removal for FWD?
It is true that the car reacts differently in FWD as opposed to 4 WD but there are lots of FWD cars out there that seem to function ok, you just don't have the advantage of 4 WD.
I actually have been thinking about putting a switch in the switch line and running it in the car to so as to have AWD on demand... not just all the time.
I'm not sure how the center diff. would fry by not being engaged, as Spock would say, it isn't logical. And while it is true the drive shaft and rear diff are still turning, the engine is not being taxed (just like the reason you get better mileage when the A/C is off than on, the weight is the same and the pully is still turning).
I would love to hear other views on this. I guess I will be a test bed for now.
acroxford@hypermall.net wrote:
I will have to agree with Josh on this not being a very good idea. One
other thing to keep in mind for the AWD to FWD cars is that they
can become a completly different car as far as handling goes and they
can even be a bit nasty in the slick stuff.
AL(CO)
--- In BC-BFLegacyWorks@y..., "D. Doug Mallow" <ddmallow@y...> wrote:
>
> If your car has the FWD switch, just put the fuse in and drive on.
A transmission mechanic checked it out and said as long as you drive
it occasioinally in 4 WD mode, it's fine. The central diff. on
automatics is just a electric clutch, it's either on or off.
> Oh by the way, I drove my 93 Legacy to VA Beach fm Atlanta, got over
29 mpg on one tankful.
>
> Josh Colombo <jcc189@p...> wrote: Personally I wouldn't even think
of doi! ng this.
>
> But to answer your question, you are really not going to get much
better
> mileage, because the center diff and drive shaft and such are all
> spinning too. Plus you'd probably end up frying the center diff.
>
> -----Original Message-----
> From: mhmarcherman@y...
> Sent: Mon 11/5/2001 11:56 AM
> To: BC-BFLegacyWorks@y...
> Cc:
> Subject: [BC-BFLegacyWorks] drive shaft removal for FWD?
>
>
>
> Can I remove the drive shaft from my 1990 4wd legacy and drive
> it as
> a front wheel drive auto? ! I'm planning some long road trips
that
> will
> see only southern highway miles and I'd like to be able to
> squeeze a
> few more mpg out of the car - I won't need the 4wd at all. Can
I
> just
> remove the shaft and drive like that or do I need to do
anything
> to
> the trans output that leads towards the rear diff? What type
of
> mpg
> increase can I expect?
> Thanks,
> Marc
>
>
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