[jessej]

I'm about to attend my first autocross tomorrow and I'm figuring I'd up the pressure... anyone out there found good results with the stock BBS wheels & dunlops? I imagine there's a lot of personal preference involved but I'm a total newbie so I was hoping to get a starting line in mind...

[Bet on Grey]

I had the same dilemma you had at my first autox. I would recommend to talk to other subaru drivers on the course. Also I would recommend to do 35 psi all around and if your starting slipping in the rear, oversteer, etc. Add or lose some psi in the front or rear, depending on the issue.
Although I had no prior experience of autox, I just kept the psi at 35 all around. Just feeling around for the course, and have fun since it is your first time and worry about tire pressure later.

Good Luck
Matt

[DrPhyzx]

Originally Posted by jessej

I'm about to attend my first autocross tomorrow and I'm figuring I'd up the pressure... anyone out there found good results with the stock BBS wheels & dunlops? I imagine there's a lot of personal preference involved but I'm a total newbie so I was hoping to get a starting line in mind...

I haven't autocrossed in years, but I know the game and how to drive. I have an insanely twisty drive to work with little traffic that I sometimes drive pretty hard. The car delivered from the dealer with about 38F/34R. It pushed a little but not too bad and only if you really overdrove it. At some point I checked the pressures and decided to let air out to 34F/34R. This was a big mistake and a huge change (much to my surprise). At those settings the front of the car would wash out completely when driven hard in some corners and was quite difficult to recover. Needless to say, I went back to 38F/34R and am pretty happy with this until I can improve the alignment. The tires howl a bit when you are at the limit, but the grip is good and the car is pretty easily pointed with the gas unless the road is steeply downhill.

So... my advice would be to run something close to those numbers, and to stay away from 34-35 all around, as I think you will not like the result.

[64stingray]

After a few experimental laps during my first autox on the OEM tires and stock alignment, I found 38F and 35R to work the best.

In 2 weeks I will run Kumhos with more neg camber and relearn.

Also try Auto Minus and turn stability control off. That worked best for me. Sport Sharp of course!

[kujo]

yes, with a stock set up, 2-3 psi more in the front will help battle Understeer and allow you to throttle steer a bit more.

Can't wait to get my STI............ druellin.....

[Wales Garage]

i ran 42f 36r this is what got the best rotation out of the car for me on the stock craplaps. bring a water bottle to cool down the tires they get greasy very fast.

[ploney]

Take this for what you can. I was running totally stock suspension and the new Dunlop Direzza Z1's at 45 F, 48 R, car roated pretty darn good.

Watch the wear patterns on the outside edges if it's going past theout ring, more air. Also, if you have a infrared thermometer, you check the temps. across the tire. Ideally, in the front, the outsides would be the hottest, then the middle then the inside. If the middles are lower than the insides, more air. Same for the rears.

I use white shoe polish on the edges to monitor how much rollover there is.