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Old 09-03-2010, 02:54 PM   #41 (permalink)
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sti typically uses 20mm, but ya, might as well check it out. keep focused though. they have way too many goodies
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Old 09-03-2010, 03:06 PM   #42 (permalink)
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LoL good thing i'm broke and have a couple motorcycle track days/racing on my mind before the end of summer. Been eyeing the STI seats/steering wheel but besides that there isn't a whole lot planned for this car (well other then full exhaust, short throw shifter, some bushings lol and i've had the car for all of a day).

thanks
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Old 09-03-2010, 07:43 PM   #43 (permalink)
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sooo i'm coming to the conclusion (without opening anything) that i have open difs how hard is it to swap limited slips out of a wrx from 02-03 ? are they clutch or gear type posi's?
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Old 09-03-2010, 08:05 PM   #44 (permalink)
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Quote:
Originally Posted by FriendlyFoe View Post
sooo i'm coming to the conclusion (without opening anything) that i have open difs how hard is it to swap limited slips out of a wrx from 02-03 ? are they clutch or gear type posi's?

Yup. Your rear is a viscous diff.

If you want a LSD you would find one from the right year and drive ratio.

Will post chart when I get home.

It is a fast in and out on a hoist.

D
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Old 09-03-2010, 08:57 PM   #45 (permalink)
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much obliged, there's a bunch of information that's only listed for the wrx and i cant find anything that lists some of the specs for the base model.

curious as to what the front back split is for power transfer, wrx says 60/40 rear.

I also have to do a little more research to understand how the front drive wheels work. Is there no differential in there or am i just missing something obvious?
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Old 09-03-2010, 09:25 PM   #46 (permalink)
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OH SNAP!

The site I typically go to that has a chart of all the gear ratios and what years are LSD and what aren't is now offline.

There are only a couple cars that have true LSD rear ends. After 02 all the diffs on the impreza went open.

As for your front... you do have a front diff as well. It is inside the tranny.

On your car the split is 60/40


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Old 09-03-2010, 09:37 PM   #47 (permalink)
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so front diff on a base model is going to be open but posi on a wrx? i dont think i'll be touching that one lol. Thanks for the comment on the split.
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Old 09-03-2010, 09:39 PM   #48 (permalink)
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There are only a couple cars that have true LSD rear ends. After 02 all the diffs on the impreza went open.
care to explain more on this? when you say impreza you just mean the base models right?

EDIT:Is this the chart you're talking about?

bah wont let me post it as a chart it's in the middle of this page Installing Subaru Limited-Slip Differentials

just click on the link at the top that says which subarus had an lsd

EDIT2: also how does the 03 manual wrx run different ratios front and back, how exactly does that work wouldn't the wheels be spinning at different speeds??

Last edited by FriendlyFoe; 09-03-2010 at 09:46 PM.
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Old 09-03-2010, 09:53 PM   #49 (permalink)
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Bingo! That is the chart I was looking for.

You will notice the last column.

VLSD Yes or No

That stands for Viscous LSD.

You are trying to find one that has a YES in the last column that matches your car.

Looking at the list you may be stuck with what you have.

I happen to have an Automatic and I put a rear diff from a 2001 RS MT.

It made a nice difference that I can feel in the wintertime.

Looks like you however are not going to be able to upgrade yours unless something else out there has a 3.90 rear end that has a VLSD.

You will also notice that it lists 2002-2003 WRX with the VLSD.

That was the only year they went into the WRX... all WRX models have the non VLSD now. (or so I am told by the dealership mechanics I talk to)

D.
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Old 09-04-2010, 07:15 AM   #50 (permalink)
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Friendly Foe, since you seem like a gearhead and obviously want to learn more about your car, can I suggest that you download the subaru maintenance manual for it. There's also some pretty interesting sections (at least in mine) the describe in detail how the awd and diffs work.

Impreza Manuals | ken-gilbert.com
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