Is this the way it's supposed to work?

wrxstijdm · 02-27-2012, 08:00 PM

So,

I have a MY98 Version 4 STI (Transmission code #TY752VBCAA).

I put the car in 1st gear and jacked the front of the car (rear wheels on the floor). I noticed that the front wheels spinned freely (on opposite directions between them). I thought this shouldn't happen, but rather get locked? I was under the impression my car had a viscous center diff? (or maybe I don't understand how it works, so if someone can help?)

Then I jacked up the rear (R160 diff, car still in first gear, front wheels on the floor), and they get locked when I try to spin them (no hand brake).

So, basically what I want to understand is if something wrong is going on with my car or not?

Thanks in advance!

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TommyAtomic · 02-27-2012, 08:16 PM

Quote:

Originally Posted by wrxstijdm

I put the car in 1st gear and jacked the front of the car (rear wheels on the floor). I noticed that the front wheels spinned freely (on opposite directions between them). I thought this shouldn't happen, but rather get locked? I was under the impression my car had a viscous center diff? (or maybe I don't understand how it works, so if someone can help?)

Then I jacked up the rear (R160 diff, car still in first gear, front wheels on the floor), and they get locked when I try to spin them (no hand brake).

Its either an open front differential or a torque biased differential and your just not applying enough torque turning the tire by hand. Nothing broken though.

wrxstijdm · 02-27-2012, 08:40 PM

Thanks for the response... I guess my other question is if that setup is the one expected to be on my car (as OEM configuration)?

wrxstijdm · 02-29-2012, 12:51 AM

Any input?

Marnix · 02-29-2012, 02:43 AM

The EJ20K all have open front diffs so yes the wheels spin opposite directions. You don't spin them fast enough to actually engage the center diff.

The rear diff has LSD so they lock.

wrxstijdm · 02-29-2012, 08:10 AM

Good to know everything is working fine in my car... appreciate it!!!

02-27-2012, 08:00 PM	#1
wrxstijdm Scooby Newbie Member#: 254590 Join Date: Aug 2010 Location: Costa Rica Vehicle: 1998 V4 Impreza STI EJ20K engine	Is this the way it's supposed to work? So, I have a MY98 Version 4 STI (Transmission code #TY752VBCAA). I put the car in 1st gear and jacked the front of the car (rear wheels on the floor). I noticed that the front wheels spinned freely (on opposite directions between them). I thought this shouldn't happen, but rather get locked? I was under the impression my car had a viscous center diff? (or maybe I don't understand how it works, so if someone can help?) Then I jacked up the rear (R160 diff, car still in first gear, front wheels on the floor), and they get locked when I try to spin them (no hand brake). So, basically what I want to understand is if something wrong is going on with my car or not? Thanks in advance! * Registered users of the site do not see these ads.

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02-27-2012, 08:40 PM	#3
wrxstijdm Scooby Newbie Member#: 254590 Join Date: Aug 2010 Location: Costa Rica Vehicle: 1998 V4 Impreza STI EJ20K engine	Thanks for the response... I guess my other question is if that setup is the one expected to be on my car (as OEM configuration)?

02-29-2012, 12:51 AM	#4
wrxstijdm Scooby Newbie Member#: 254590 Join Date: Aug 2010 Location: Costa Rica Vehicle: 1998 V4 Impreza STI EJ20K engine	Any input?

02-29-2012, 02:43 AM	#5
Marnix Scooby Specialist Member#: 51480 Join Date: Dec 2003 Chapter/Region: International Location: The Netherlands Vehicle: 1984 AM5, 1994 BC4, 2010 BR5	The EJ20K all have open front diffs so yes the wheels spin opposite directions. You don't spin them fast enough to actually engage the center diff. The rear diff has LSD so they lock.

02-29-2012, 08:10 AM	#6
wrxstijdm Scooby Newbie Member#: 254590 Join Date: Aug 2010 Location: Costa Rica Vehicle: 1998 V4 Impreza STI EJ20K engine	Good to know everything is working fine in my car... appreciate it!!!