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Old 02-13-2001, 09:45 AM   #1
Scooby Specialist
Member#: 865
Join Date: Feb 2000
Location: St. Albans, VT, USA
2003 BMW M3
Phoenix Yellow

Post Fixed Ratio Center Diff?

Does anyone know if there is a fixed ratio center diff that will work on my MY2K RS? I am really sick of this front wheel drive bias and would like to switch over to a 60% rear 40% front distribution.

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Old 02-13-2001, 09:57 AM   #2
Scooby Specialist
Member#: 3139
Join Date: Dec 2000
Chapter/Region: RMIC
Location: SLC Utah
2001 Dodge Pikumup
& 08 Triumph Speed Triple


Cobb tuning sell one that will do 35% frount and 65%. rear.http://www.cobbtuning.com/impreza/drivetrain-lsd.html

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Old 02-13-2001, 10:31 AM   #3
Scooby Specialist
Member#: 524
Join Date: Nov 1999
Location: WA
04 STi


Well they make spools that do that, but you can't use them on dry pavement unless its a straight line.

BTW you car DOESN'T have a front bias unless its a Auto. 50-50 is NOT biased at all.
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Old 02-13-2001, 10:39 AM   #4
Scooby Specialist
Member#: 865
Join Date: Feb 2000
Location: St. Albans, VT, USA
2003 BMW M3
Phoenix Yellow


My point is, the car handles like a front wheel drive car. It is nearly impossible to throttle steer the car and it pushes through the corners. I have solved most of that problem with an 18mm sway bar and a set of DMS shocks but the fact remains, when you get on the throttle on the ice or snow it handles like a front wheel drive car.

My daily driver is an A6 Quattro which has a rear wheel bias on the power and I can throttle steer it quite easily. It is ice racing season here in Vermont and you need to be able to throttle steer a bit.
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Old 02-14-2001, 01:36 PM   #5
Homicidal Maniac
Member#: 1612
Join Date: Jun 2000
Location: Austin, TX
2008 STI


Alignment, tire pressures, fine tune suspension. 'Nuff said.

As long as you don't have an auto, you can rotate your car once it has been setup properly. 18mm bar is generally good for stock suspension, but once you upgrade suspension I think everybody recommends a larger bar.

Check out www.importcars.net/subaru/ and you can see Dan's car is its full throttle steer action
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Old 02-14-2001, 02:11 PM   #6
Scooby Guru
Member#: 114
Join Date: Jul 1999
Chapter/Region: MWSOC
Location: Wichita, KS and Whoring, OT
'03 Evo, Rice White
'01 Erion CBR 929


Not quite. A properly setup Impreza with 50/50 torque split can be made to oversteer under lift and then you can recover with throttle-- that qualifies as steering with the throttle, sure.

It does not exhibit RWD tendencies of throttle steer though, where the rear end can be moved to oversteer while applying the throttle.

I agree with Kurt's initial diagnosis-- the car needs more power to the rear wheels and less to the front to exhibit that sort of behavior. A front LSD could help control power-understeer too assuming the car has significantly more than stock 2.5RS power. (Pretty sure Kurt has the whole tec2 / intercooled turbo thing going.)

[This message has been edited by ColinL (edited February 14, 2001).]
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Old 02-14-2001, 04:54 PM   #7
Scooby Newbie
Member#: 2646
Join Date: Oct 2000
Location: Lincoln, NE USA

I've always thought of what throttle steer as
a function of wieght transfer, not power delivery. Your going into a turn with the steering wheel holding a constant arc. You lift the throttle, wieght shifts to the front tires, giving them grip and the car rotates, tighting the line. Step on the gas and weight shifts to the rear, giving the rear tires grip and the car starts to push.
So, with this method you should be able to tighten or widen the arc of the turn with only the thottle, while the steering wheel is held steady.
All the impreza should need to do this is a bigger rear bar to give the car a bit of throttle lift induced oversteer. Any car, regardless of the driven wheels, should be able to do this with the proper setup.

Power oversteer is another matter all together, and not what I would call steering with the thottle. It's much harder to control, requires counter steering to regain control, can be dangerous, and is slower on the track.

That said, power oversteer on snow or ice, is very easy to get, at least with my impreza. (Manual MY01) If I crank the wheel and step down on it hard, the back end breaks loose and will come around. The LSD in back insures that the rear wheels spin together, and the center differential CAN send more power to the rear wheels, since it has to allow some built in differences in speed between the front and rear wheels. The impreza does not have enough power to do this in the dry, but it does when the going gets slick.

Have you seen the videos of the car doing the so called scoobynuts?
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