air pressure

[cruzned]

What air pressure are you running your tires at in AutoX. Just don't want the tires to roll off the rims!

[JRinKY]

I run stock tires at stock pressure. Or a little bit higher.

The best place to check is at the Solstice Forum, they soloed all last summer.

[cruzned]

Running stock air autoX is a very bad idea!!! That will result in the tires rolling off the rims at higher speeds and sharp turn changes, which is why we overinflate them in the first place. I was just curious how much those that were actually autoXing them were putting in. Usually I put in about 10lbs more than stock. If you put chalk on the edge of the tire and do a run, you can see where they roll off the rim a bit or wear. You are most likely correct on the solstice suggestion. Will check there to see what they use since the two vehicles are so similar.

[MidniteBlues]

Originally Posted by cruzned

What air pressure are you running your tires at in AutoX. Just don't want the tires to roll off the rims!

What do you mean by autoX? never heard that term used before.

[James L. Lee]

Originally Posted by MidniteBlues

What do you mean by autoX? never heard that term used before.

AutoX is short for Auto Crossing a form of single car timed racing on a track...

[snaponbob]

Proper tire pressure is going to depend on what tires are used, and what pavement conditions are. "Chalking" tires will only show if there is EXCESSIVE roll under of the tread. I ran one autocross in October with my RL using Hoosier 245/35X18 A06 tires and ran about 32-33 psi. With stock alignment settings and VERY grippy concrete there was only modest roll under. An infrared pyrometer showed that the temp gains across the treads were very good. If I were going to run stock tires I would probably go with about 35-37 psi, and that might be too high. Once I put a bit of negative camber into the mix I will actually DROP my pressures a pound or two.

[JRinKY]

Back in the dark ages (1980 or so) we ran about 10psi over standard pressures to minimize rollover with the skinny 70 and 75 series tires on the MGB and, later, the TR6.

I've seen people run everything from stock pressure to 15psi over with 45's, but the best results seem to come from running at the hot pressure for a given car/tire combination. For my Sky, on most days, that is about 32 psi, which is "a little bit over" stock.

At no pressure, from stock on up, have I ever seen a tire shed from the rim.

Maybe it is a bad idea, or maybe I'm just slow, but it works.

[Pitcom]

You guys have a site that lists auto cross tracks? Very interested, thanks.

[Antonio]

Originally Posted by Pitcom

You guys have a site that lists auto cross tracks? Very interested, thanks.

I would second that question. Once nature starts to cooperate with us again, I'm very much interested.

[JRinKY]

Pitcom : You guys have a site that lists auto cross tracks? Very interested, thanks.

Around here, there are no "autocross tracks". Solo's are run by the local SCCA Club, usually in parking lots.

Go to scca.org and look up a club in your area, then contact them about their solo schedule.

On the other hand, if there are autocross tracks around, I'd like to know about them, too.

[Antonio]

After posting, I decided to look into Raceway Park again to check up on their progress of their road course being built. They have made some progress since I last checked, have put the road down, but still in construction on walls, buildings, etc.

I also noticed they added a video of a car running the the track for a full lap and counting the turns.

Looks to be very fun.

http://www.youtube.com/watch?v=gpT9-3KRrJw

I WILL go on this course if it will be open for public use, just like their 1/4 and 1/8 mile drags.

[snaponbob]

The two ways to find out what is going on is to look at http://www.scca.com/ and start poking around, and Google "autocross" and add the major city you live near/in. Once you hook up with ANY autocross club they will know where local and regional events are. If you "catch the bug" then the best investment after a VERY good helmet is the Evolution driving school at http://autocross.com/evolution/modules/news/ . I attended an Evo school this last fall with my TR8 and it was great. I hope to do it again in the Redline. At about $500 it is not a small amount of money. But it IS years of learning jammed into a weekend. It's a BARGAIN. It is also FUN.

Warning!!!! Base Skys are classed in C/Stock, and Redlines are in A/Stock. Both are ball buster classes, but the cars are potential class winners in each.

[cruzned]

snapbob: Excellent adice to all! Kudos! Thank you.

[RobL]

Originally Posted by Pitcom

You guys have a site that lists auto cross tracks? Very interested, thanks.

Aston, PA - down around Delaware?

If so, http://www.autox4u.com/schedule.htm .

You are in my local region and our website is : http://www.phillyscca.com

Autox4u will list the autocrosses from about 30 different clubs from Maine down to Virginia (and including National events from all over the country). Most clubs right now are getting their schedules together so it's a bit scarce. But in a couple of months, that schedule will be full of events within a couple of hours every weekend.

I'll be running a lot over the summer. The wife has OKed me to make a shot for a National Trophy this year and do whatever it takes. That means a lot of events and a lot of travel. Shoot me a PM or email (rob_leone at verizon.net) when you are ready to come out and we'll try and meet up.

[Elff]

Rob

I did the Novice AutoCross at the Mack Truck Headquarters and my wife did the Warminster event in her Mini Cooper.

We live in West Chester. Schedule has been a little crazy lately, but we are looking to do a bunch of events in the future.
I have to say, the Philly SCCA guys are all really nice, very helpful and excellent coaches.

["Maine"-iac]

I have a stock 2.4L Solstice and when I had the Goodyear RSAs on the car I ran 39psi in the front and 37psi in the rear. The 39psi helped compensate a bit for the understeer tendencies of the car and the 37psi rear helped to keep the rubber to the ground for acceleration purposes. Best thing you can do if you want to continue to autox is to get rid of the RSAs if that's what you're running...they have lousy grip. I recommend the Dunlop Direzza Sport Z1 Star Specs...awesome street tire, super grippy and great in the rain too. They lowered my autox times by 2-2.5 seconds. Take note though that they don't give you any warning when they break free. The RSAs used to screech a lot when cornering hard, the Dunlops don't. Good luck with Autoxing.