BRZ Autocross Setup: Tire Strategy, Wheel Setup & Camber Tuning for STX & TT5

Autocross Push Begins

The local SCCA region introduced a weeknight PAX Challenge series, and I did OK at the first of which back in ~May.

I think I was top 10 PAX with the car as it sat, but that just wasn't good enough, so Autocrossification began.

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Tire Limitations & Performance Issues

Primary issue to address was tires.

I had installed a set of RE71R scrubs from a buddies NC MX5 endurance racecar effort. They were made in 2016. They worked great for HPDE and street use, but were clearly lacking in freshness for any sort of competitive environment.

Wheel & Tire Strategy

Being an eternal "value conscious consumer" I picked up a batch of used wheels from Blub(949 Racing's r&d car) as well as some 2019 AO52s from a local customer/buddy when I sold him some new ones.

The wheels were mostly all Charcoals, but with a few Berylliums and a Silver that were already rattle canned black to match. They needed a fresh lease on life, so they got further rattle can treatment.

Ultimately, one set received the scrub AO52s and the other some scrub 225/40/17 R7s from another customer for future NASA TT5 shenanigans.

Marked A and B after I checked them all on the balancer. Mostly straight A's for street tire duty went rustoleum metallic bronze, B's got faux Beryllium for race tires.

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Alignment & Setup Adjustments

At the time of wheel swap, the whole car got lowered a bit more, front quite a bit to introduce some rake, as well as bumped back up to -4.2 front camber. The rear needs more camber as well, but in my interest of keeping it NASA TT5 legal, I am skipping the normal RLCA upgrade that STX cars would get and have a set of offset RUCA bushings sitting on a shelf waiting for install.