im surprised you are having problems with understeer...the RE-92's break loose quite easily causing drifts more then anything...atleast thats what i felt when I had them on my car...

 

Sorry, but the weight distribution on the WRX Wagon is nowhere near 50/50. Road and Track listed it at 60/40 ("Why Not a Wagon" article 5/2002). That's a lot of mass up there that causes the plowing.

I would personally adjust the tire pressure to be higher in the front and lower in the rear. This will allow greater sidewall flex in the rear which will generate greater slip angles and some degree of oversteer.

As always, make changes slowly (I usually change tire pressures 2 psi at a time) and see how they will effect the handling of the car.

 

Jetguy, the numbers just do not support your claim of a 50/50 weight split.

WRX Sedan: 3130 lbs, 61/39 weight distribution (R&T 5/2001)
WRX Wagon: 3245 lbs, 60/40 weight distribution (R&T 5/2002)

All other road tests place the weight distribution within a percentage point of those figures. The 80 lbs added to the rear is simply not enough weight to move the distribution from 61/39 all the way to 50/50!

The few front-engined cars that do achieve a 50/50 weight split do so by either 1) moving the engine significantly rearward in the chassis, usually so its centerline is behind the front axle, and/or 2) placing the transmission in the rear, i.e. a rear transaxle. I don't think this is practical for a front engine/ AWD car, although they usually have better weight distribution than FWD cars due to the weight of the rear axle.

Some examples of cars that achieve nearly perfect weight distribution with a rear transaxle are the Porsche 944 and the Alfa Romeo Alfetta GT/GTV6.

 

I used the Road & Track numbers because they actually weigh the car on a scale instead of relying on manufacturer data. The manufacturer weights you cite still leave the front to rear weight ratio relatively unchanged.

Using a weight of 3085 for the sedan with a 60/40 weight distribution, this gives us weights of 1851 lbs front and 1234 lbs rear. You would need to add 617 lbs to the rear to achieve equal weight distribution.

Now, I'm sure we are all glad Subaru only added 80 lbs to the wagon and not 617 - we'd end up with a car with equal weight distribution but weighing in at a portly 3702 lbs! Now that's almost as heavy as an Audi

 

Yes, back to the real world... Polar Moment is much different than simple weight distribution. I don't know enough about the subject to calculate or comment on that.

I was much happier with the understeer when I ran 38 psi front 34 psi rear on the stock RE-92s. Although it didn't eliminate push the onset came at higher limits. Judging from the scuff marks on the outer edges of the tread, the tires were also being worked more evenly at those pressures.

I now have snow tires on and get understeer in the dry no matter what