Compare street tire(same size), when you upgrade to r-compund, should increase or decrease the camber? caster?

 

Increase camber - the car will roll more and the tire may flex more in spite of the stiffer sidewall. You need to keep the tire flat on the ground.

Set camber first, take what caster you can get.

 

Take tire temps. That will give the information necessary to determine how much camber.

 

Pyrometer would give you the best indication. I'm looking at this one:

 

X3 on the pyrometer, it will take a few events to maybe get the camber right.

 

While I understand the need for the pyrometer, I'm not a huge fan of them because each autocross is different, leading to inconsistent readings due to course design and even surface changes, all spread across a short run. It's not like a track where you run lap after lap. Test and tune days would help but then the course changes again...

 

I don't believe Owen does any auto-x, just track days. on the pyrometer.

 

Personally, max caster, then you max camber within the tire "needs'. You can do this by just looking at the tire, but the pyr will eventually save money on wear and is a lot more precise.

Maybe the nats boys are adjusting camber on one for a particular course, but in my experience I want as neutral R-L as possible.

 

I am with you on maximizing caster first, then set camber as needed.

 

from my understanding, you dont check after autocrosses to get your camber... you drive in a ciricle at limit for a few loops and then stop and take a reading of the outside tires (outside/middle/inside), then repeat the procedure for the other side of the car in the opposite direction.

You want to get the right camber for the tires when they are planted on the outside of the car taking most of the cars weight.

Someone correct me if this is wrong, but thats what I was told by a few of the local guys who held an 'Alignment Clinic' this year.