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Old 11-24-2002, 04:13 PM   #1
Ultralight
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Default D.O.T. slick/WRX tire pressures

What pressures front and rear on a moderately grippy surface are a good starting point on the WRX with Hooisers? If I can get 2.5 to 3 degrees of camber in front, I would guess about 43lbs in front and 39 in rear.
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Old 11-24-2002, 08:14 PM   #2
ConeMasher
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Since I still thought you're running in stock classes...
Maximum camber you can get w/ the stock camber bolts is 1.2 degrees negative. I've seen claims of 1.5 degrees, but considering the living hell I put my alignment guy through to get 1.2.... I kind of doubt it.

Some folks have run EXTREMELY high pressures in the rear to get them to crown a bit. This is obviously an attempt to get the car to rotate (without the sidewall rollover that a substantially lower pressure would result in).

-- Gary
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Old 11-25-2002, 02:11 AM   #3
Ultralight
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A local WRX driver in DS said he got 3 degrees in the front. If most of the stock fronts are reported to get only 1.2 to 1.5 degrees, I may suspect him of running non-stock camber bolts as he ran illegal rims this last season. No one in his class was knowledgable enough to protest.
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Old 11-25-2002, 10:58 AM   #4
ConeMasher
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Looks like you're going to have to corner him for a little chat before the upcoming season...

Sounds like he's running lowering springs, or an illegal camber kit.

There has been no allowance for crash bolts on the WRX because SOA/FHI hasn't referenced them in any of the factory service manuals or tech bulletins.

We're limited to the single eccentric bolt (and loosening and retightening the upper bolts to get a bit more wiggle room). There is NO way to get 3 degrees out of it. Anything over 1.5 degrees is protest-bait. I wish I could've gotten 1.5 myself, but I maxed out at 1.2.... maybe I'll try again before next season, with some extra muscle for leverage

-- Gary
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Old 11-25-2002, 12:49 PM   #5
trhoppe
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Use a "comealong" and attach is to the tow hook and then the control arm while wrapping it around the bottom of the strut. That way when you tighten the piss out of that thing and loosen both strut bolts, it will pull the bottom in for a little more negative camber. Also loosen the top bolts and push the strut in all the way. I had -1.3, after I did all that I got -1.5. Every little bit helps.

I ran 48 in the fronts and 65-70 in the rear on the hoosiers.

-Tom
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Old 11-25-2002, 05:29 PM   #6
Ultralight
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(I ran 48 in the fronts and 65-70 in the rear on the hoosiers.

-Tom)

Yikes! And the fronts still wore out before the rear centers were corded! I would have never even experimented with pressures that high in the back. I've been driving a Miata too long. Well thank guys for the info. I'm still researching for strut replacements. Ohlin and Protrac make some very interesting gas shocks. I have emailed them to see if they make a WRX strut replacement. My wife and I plan to go to Topeka in 03 so I want to do it right. We have a good benchmark to judge against in Kevin McCormick who runs just over the hill from us.
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Old 11-25-2002, 05:44 PM   #7
trhoppe
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Yup, Mccormick is a great benchmark, but I heard he is going to STX in 2003.

Anyways, it will be very course dependent and "launch" depended with him. I beat him at the ProSolo finale by almost 8 tenths over two days, but got SMOKED at the national championship. Part of that was my head firmly up my ass, and part of it was the awesome transition ability of the TypeR.

-Tom
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Old 11-25-2002, 06:04 PM   #8
Ultralight
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Tom, I understand the H.U.A. condition. It seems to inflict me the most whenever I run a Karen Babb course. And yes the Integra R and the WRX are at the extreme ends of the envelope as far as course dependency. Our local courses (Reno Region) and some of the California clubs generaly run to long straights and broad sweepers with less "busy" stuff. Occasionally our courses run a mile plus with no more than 15 turns. The WRX does very well PAX wise around here, also helped by the altitude, 4500 to 7000 feet where the normal asp cars run out of breath. Depending upon who designs the course though, we will get to run against some fast DS cars in the SFR and NW regions on some tight, busy courses. Any tips on how to beat those dratted Integra Rs and IS300s will be greatly appreciated. Hope to see you in Topeka if my health holds out.
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Old 11-25-2002, 06:10 PM   #9
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Quote:
Any tips on how to beat those dratted Integra Rs and IS300s will be greatly appreciated
drive fast
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