Center Diff install complete!!: WHINE FOUND!: NOW WHINING!

Soul Shinobi · Post by **Soul Shinobi** » Sat Aug 29, 2009 3:56 am

skoobywrx, it looks like it hasn't been out too long based on the lack of rust in the picture. Unless it hasn't rained in 5 years, where is this from again? Also, how even is tire wear, this could possibly be an indicator.

evolutionmovement wrote:How does it get the power down? Is torque steer bad? Mine will be fwd turbo when I get it running, so I'm curious.

You're joking about the torque steer, right? WE'RE SYMMETRICAL, BABY!

fishbone79 · Post by **fishbone79** » Sat Aug 29, 2009 4:37 am

skoobywrx wrote:harm the tranny or do you mean harm the center diff?

yes, I meant either/both... but if the center diff is F'd, then you really can't risk harming it. I really doubt a few slow turns in a parking lot or residential street will harm the transmission at all, even if the center diff is completely locked. Bucking, cachunk-kachunk, etc. is what you'd feel if it's bad, as per PhyrraM's post... if that happens, limp it home and I'll sell you a working center differ for $30 shipped

Soul Shinobi wrote:skoobywrx, it looks like it hasn't been out too long based on the lack of rust in the picture. Unless it hasn't rained in 5 years, where is this from again?

I was thinking about that too... but then I realized how immaculate the bottom of that car is. Maybe I'm disillusioned by the N.E., but that sucker is clean. My diff housing looks like a russet potato chip with a bad case of shingles, and I couldn't even tell you what number exhaust I'm on.

skoobywrx · Post by **skoobywrx** » Sat Aug 29, 2009 4:54 am

im in the Pac NW so im where there plenty of moisture....

tire wear is pretty even all around......getting to the pull a part this sunday....

i just spent a few hours yank so nasty old fuel filler hose and other rotted out lines.....

thanks guys!! youre much more helpful than that other suby site

Soul Shinobi wrote:skoobywrx, it looks like it hasn't been out too long based on the lack of rust in the picture. Unless it hasn't rained in 5 years, where is this from again? Also, how even is tire wear, this could possibly be an indicator.

evolutionmovement wrote:How does it get the power down? Is torque steer bad? Mine will be fwd turbo when I get it running, so I'm curious.
You're joking about the torque steer, right? WE'RE SYMMETRICAL, BABY!

evolutionmovement · Post by **evolutionmovement** » Sat Aug 29, 2009 5:14 am

Even driveshaft length doesn't kill torque steer if there's enough torque. The open diff will always want to put more power to one side. It's also a function of suspension geometry. That said, mine had hardly a problem, but I'm wondering about what an extra 50 lbs/ft would do. The only advantage I found with AWD in these cars is getting off the line in slippery conditions or plowing through snow banks without shoveling. Makes tire choice even more important, but I like the taller FD and reduced weight. For now.

entirelyturbo · Post by **entirelyturbo** » Sat Aug 29, 2009 2:27 pm

The only way to get rid of torque steer is to get a RWD car.

Hell, my Honda has torque steer... and yes, I used the words 'Honda' and 'torque' in the same sentence.

The axles will probably take the most abuse from bucking and jumping while turning.

Post by **Legacy777** » Mon Aug 31, 2009 3:22 am

When I was FWD, I didn't have torque steer too bad, but whenever it was wet, I'd burn rubber like nobody's business. That will be your biggest problem.

skoobywrx · Post by **skoobywrx** » Mon Aug 31, 2009 5:30 pm

went to the junkyard, and pulled a prop shaft from a 97 impreza wagon. think this will work? was 45 bucks for the the entire shaft, from center diff to the rear diff.

Soul Shinobi · Post by **Soul Shinobi** » Mon Aug 31, 2009 6:20 pm

Imprezas have a shorter wheelbase, won't fit.

skoobywrx · Post by **skoobywrx** » Mon Aug 31, 2009 6:39 pm

Soul Shinobi wrote:Imprezas have a shorter wheelbase, won't fit.

dang it!!! maybe i can trade it for a legacy one

fishbone79 · Post by **fishbone79** » Mon Aug 31, 2009 10:40 pm

Soul Shinobi wrote:Imprezas have a shorter wheelbase, won't fit.

Although, it really wouldn't hurt to slide it in there and see if it does fit... Knowing subaru, they don't want to manufacture 2 completely different shafts if they don't have to, so they may use a shorter front- half to account for the impreza wheel base, and the rear half may be the same as the legacy.

Just a thought, might be completely wrong

Soul Shinobi · Post by **Soul Shinobi** » Tue Sep 01, 2009 12:59 am

Hey, I agree completely, give it a shot for the hell of it! If it fits you guys can start buying those $1000 Impreza carbon fiber driveshafts.

fishbone79 · Post by **fishbone79** » Tue Sep 01, 2009 1:30 am

Soul Shinobi wrote:If it fits you guys can start buying those $1000 Impreza carbon fiber driveshafts.

Sorry to be OT, but I always wondered about those things.... I mean, isn't torque Carbon fiber's biggest weakness? I'm a bit familiar with its structural characteristics as it's used in bike frames, but big fat guys like me don't dare try it.

Soul Shinobi · Post by **Soul Shinobi** » Tue Sep 01, 2009 1:57 am

They're claimed to be good up to 800hp to the wheels

evolutionmovement · Post by **evolutionmovement** » Tue Sep 01, 2009 2:14 am

But what happens when a rock chips it? Seems like spending a fortune to save a few pounds on an inevitably heavy vehicle. Removing the spare tire, taking a massive shit, and getting an Odyssey battery would do better for much less.

skoobywrx · Post by **skoobywrx** » Tue Sep 01, 2009 2:23 pm

ill try it out when i get home

skoobywrx · Post by **skoobywrx** » Wed Sep 02, 2009 6:04 am

97 Impreza wagon was way to short, so i got a Legacy 5spd drive shaft from AArons auto and got the shaft in, and all is well, even drove in a circle a few times! No puking, and nothing bad! couldnt push it highway speeds, as my axleback is off!! sounds mean!!

but i think all is well! did some hard turns too! man does this car have a good turning radius compared to my STi!

thanks for your help guys!

**i also fixed my fuel lines, in the engine forum, but still noticed some fuel smell, looked under the car and saw fuel, none of the lines were spilling, but the top of the fuel tank, were the sending lies i guess, were not even finger tight!!! i guess it got loose after years of neglect. **

Soul Shinobi · Post by **Soul Shinobi** » Wed Sep 02, 2009 6:05 am

No freaking way, so that Impreza shaft bolted right up?

skoobywrx · Post by **skoobywrx** » Wed Sep 02, 2009 2:20 pm

oops, edited.

Meant to say: the 97 impreza wagon shaft was way too short, so got a Legacy 6sp shaft from the suby junkyard.......

Soul Shinobi wrote:No freaking way, so that Impreza shaft bolted right up?

skoobywrx · Post by **skoobywrx** » Fri Sep 04, 2009 12:08 am

Update....

First test drive, it was fine, nothing out of the ordinary...now i got some chirping in the wheels when im doing tight corners, like entering a parking stall.....

Went to the suby junkyard and they suggested some GM LSD additive.....

Is the center diff the issue? straight line the car is fine, normal turns is fine, its when i try to do a u-turn or parking stall entering is when it starts to buck and chirp.

HELP!!!

PhyrraM · Post by **PhyrraM** » Fri Sep 04, 2009 12:12 am

Center diff.

I don't think an additive would work because the viscous coupling in the center diff is a sealed unit.

Soul Shinobi · Post by **Soul Shinobi** » Fri Sep 04, 2009 12:43 am

PhyrraM wrote:I don't think an additive would work because the viscous coupling in the center diff is a sealed unit.

Correct, altering the transmission fluid will have zero effect on a bad viscous coupling LSD center diff, which is very likely the issue.

evolutionmovement · Post by **evolutionmovement** » Fri Sep 04, 2009 1:30 am

Well, at least now you know why they yanked that driveshaft.

Soul Shinobi · Post by **Soul Shinobi** » Fri Sep 04, 2009 1:32 am

That could have easily been a result of the driveshaft having been taken out, no?

evolutionmovement · Post by **evolutionmovement** » Fri Sep 04, 2009 2:39 am

Could be, but I think the driveshaft being removed is more suspicious.

PhyrraM · Post by **PhyrraM** » Fri Sep 04, 2009 2:42 am

Soul Shinobi wrote:That could have easily been a result of the driveshaft having been taken out, no?

Yes, I'm not sure what the most common failure mode of a viscous coupling is (locked or open), but I know it's not designed to have only 1 end "open". It needs a relatively equal amount of torque (over time) distibution to keep from overheating and shearing the fluid. It's really designed to handle a momentary "peak" type of load and then return to normal. For example....if the rear was on ice while pulling away from a curb.

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Center Diff install complete!!: WHINE FOUND!: NOW WHINING!