Hi, as I'm entering my 10th HPDE event I start to see some limitations my car has. I have a base GT with some add ons.
One of the issues is that the outer part of the tires is getting eaten more aggressively as my tack skills are improved. I would like to add some camber. I have the Steeda plates and rear kit that can be adjusted, but I have absolutely no idea what numbers to aim for. The car is also a daily. Ideally, (I know though, it's not ideal) I would like to drive the car with that camber in the street while having "minimum" wear. Changing camber back and forth and having to do an alignment every time is not an option at the moment.

My car has the FP track springs , 18x10 apex wheels with 275/40 Continental ECS2

Thanks

How many HPDE sessions d the Continental ECS2 tires last? That will help others provide an answer. And you say your 10th HPDE, but how often do you go?

If you are doing a lot of tracking, then you can use more negative camber up front, because you will be wearing the tires before you wear out the insides driving sedately on the street. If, on the other hand you might go 4-6 months without a trip to the track, and aggressive camber setting is going to wear the inside shoulder/tread.

S650GT said:

Changing camber back and forth and having to do an alignment every time is not an option at the moment.

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With that in mind, whatever setting you choose will be a compromise, and you need to accept that.

Let's start with the assumption your current tires have been on the car for a while and have seen your typical mix of everyday and track driving. If the tires are being worn more heavily on the outer shoulders from track driving with too little camber, and the inside shoulders don't look too worn from street driving with too much camber (or toe out), then you can stand to dial in more negative camber.

How much more camber should you use? Somewhere more than what you have currently and probably less than all you can get. I know, you want us to give you a number, but the ideal compromise number is specific to your driving style and aggression, your mix of street / track, the particular track(s) you drive, etc.

It would help if you gave us your current alignment numbers, and maybe pics or front & rear tire wear, and a rough estimate of the miles on the tires from street vs track.

Just spit-balling without knowing the above, I'd throw another -0.5 on the front and -0.2 on the rear. Check wear periodically and adjust.

S650GT said:

... I would like to add some camber. I have the Steeda plates and rear kit that can be adjusted, but I have absolutely no idea what numbers to aim for. The car is also a daily. Ideally, (I know though, it's not ideal) I would like to drive the car with that camber in the street while having "minimum" wear. Changing camber back and forth and having to do an alignment every time is not an option at the moment.
...

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I wrote several DIY alignment articles over at 6g. They can be found at my build log, which contains many links to other tech tips.

Here is my technique to easily and accurately switch between street and track settings:

These days I put on my track brake pads and track wheels, and change the front alignment for track. Then I drive 200 miles to the track and back this way. My logic is that the wear on track tires rolling down the freeway is nothing compared to screaming around the track, and those tires won't last more than 4 weekends anyway.

How much camber? The answer is always "As much as you can get!"
I ran -3.7 up front last weekend, and I plan to try my max setting of -4.2 next. This for 200tw tires, not 300tw.

I also designed a camber gauge for Steeda plates.
DIY Camber gauge for Steeda plates

I think IMSA only allows us to run 3.5, and we'd like to get more if we could, you'll need plates and maybe cutting the shock tower. The 275 tire is way too small for these cars, try to get some 305s on it if you can