Got a track related question? I'll try to answer.

[jflogerzi]

Originally Posted by 3k1n

Hi Mike, Question for you. I have a 2017 BRZ for which I plan to autocross 5-10x a year. I'm getting an alignment soon and plan to have -4 degrees of camber in the front and -2.5 in the rear with 1/16th toe in in the rear. I plan to do a handful of track events a year, so my question for you is, will that much negative camber in the front significantly negatively impact acceleration and braking performance?

From my understanding most guys that track their BRZ/FRS don't dial in more than -3.5 degrees in the front.

Damn that's alot camber... Any particular reason for that much? I am really just curious to learn more bout the platform

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[jflogerzi]

Any advice on scrubbing RE71rs? I am reading conflicting posts online. From what I gather warm them up a bit and then let them sit 24 hours. What kind of driving can be done to warm them up(Canyon?) and for how long before cool down?

[TommyW]

Originally Posted by 3k1n

From my understanding most guys that track their BRZ/FRS don't dial in more than -3.5 degrees in the front.

For good reason. I’m not sure what type of setup would warrant -4. If you do it I’d check tire temps.

[3k1n]

Originally Posted by TommyW

For good reason. I’m not sure what type of setup would warrant -4. If you do it I’d check tire temps.

I probably should check Temps before making the jump and dialing in that much camber. If you jump onto the STX prep thread, there are a bunch of autox guys running -4 degrees. I may just end up going with -3.5 at most.

[TommyW]

Originally Posted by 3k1n

I probably should check Temps before making the jump and dialing in that much camber. If you jump onto the STX prep thread, there are a bunch of autox guys running -4 degrees. I may just end up going with -3.5 at most.

I'd stay there. I think you'll find that's pretty damn good. STX is a totally different car. I'm guessing with the extra weight and possibly more body roll the -4 works

[Code Monkey]

Originally Posted by TommyW

For good reason. I’m not sure what type of setup would warrant -4. If you do it I’d check tire temps.

I am at -3.9 camber and this is based on tire temps. At -3.5 the outsides were still too hot.

[trakday]

Hi Mike,

I'm new to 200tw tires and had some quick questions on the treadwear on my RE-71Rs (photo below, driver's front). These tires have around 500 street miles plus one track day. I'm still at stock camber, so I'm sure adjusting that will help and I plan to handle that before the next yeah day. It also looks - to my novice eye - like I let them overheat a bit. Questions:

1. Driver's front is by far the worst. Is this tire shot or can I do another track day on it?
2. If I can put another track day on them, should I have my tire shop switch the front tires?
3. If I can put them through another day, will I be able to get home on them?

In retrospect, jumping straight from the Primacy to the RE-71R was probably a bit ambitious ��

Thanks for any insight!

https://photos.app.goo.gl/1Bs99YATA7mA5Ujj8

[NoHaveMSG]

Originally Posted by trakday

Hi Mike,

I'm new to 200tw tires and had some quick questions on the treadwear on my RE-71Rs (photo below, driver's front). These tires have around 500 street miles plus one track day. I'm still at stock camber, so I'm sure adjusting that will help and I plan to handle that before the next yeah day. It also looks - to my novice eye - like I let them overheat a bit. Questions:

1. Driver's front is by far the worst. Is this tire shot or can I do another track day on it?
2. If I can put another track day on them, should I have my tire shop switch the front tires?
3. If I can put them through another day, will I be able to get home on them?

In retrospect, jumping straight from the Primacy to the RE-71R was probably a bit ambitious ��

Thanks for any insight!

https://photos.app.goo.gl/1Bs99YATA7mA5Ujj8

Those look mint to me

[trakday]

Originally Posted by NoHaveMSG

Those look mint to me

This is where my inexperience with 200tw tires is tripping me up haha. The left side of that center strip is down to the wear bars, but the rest of the tire is mostly still fine. I just wasn't sure if that center part was going to be a problem.

[NoHaveMSG]

Originally Posted by trakday

This is where my inexperience with 200tw tires is tripping me up haha. The left side of that center strip is down to the wear bars, but the rest of the tire is mostly still fine. I just wasn't sure if that center part was going to be a problem.

I didn't see that before. It is not that big of a deal, my RT660's are the same way. You should be able to run those to the cord. Though I am curious what you are running for hot pressure. Shoulders don't look that worn.

[rice_classic]

Originally Posted by trakday

This is where my inexperience with 200tw tires is tripping me up haha. The left side of that center strip is down to the wear bars, but the rest of the tire is mostly still fine. I just wasn't sure if that center part was going to be a problem.

Mac Struts don't help the tire wear unfortunately. You would have to run so much neg camber to use the contact patch evenly on the track, that it's impractical for daily driving and camber that's manageable for daily driving just isn't enough to evenly wear the tire on the track.

So you're left with 1 option: Rotate your tires a lot. Thanks to a quick jack, I rotate tires every session (rule limited to -3.5) but my tires do wear much faster. You could probably get away with 2-3, then rotate. Don't pay attention to the direction of the tread either because the "directional" function is for water displacement so if the track is dry - the carcass doesn't care what direction they are rotating in.

[Icecreamtruk]

Just for some extra info, depending on the setup and the driver, you might need way more than past 3.5 degrees of camber up front. The reason you see so many people at around that is usually because their cars are double duty (try to daily a car at 5 degrees) or because their are limited by the setup (camber plates only get you so far). Mcpherson struts like a lot of camber. Also, equal wear does not mean fastest times, you sometimes need to sacrifice the wear and life of the tire to get the best results. For those competing, it matters.

All that to say, the sweet spot for 100-200TW tires (semi slicks or sticky street) and moderate aero (splitter, vents and wing) is in the 4 to 5 region, provided the driver can extract everything out of the car.

[jflogerzi]

Are you managing your PSI when hot? Excess wear in the middle means they are over inflated?(not 100% sure on this)

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[trakday]

Originally Posted by jflogerzi

Are you managing your PSI when hot? Excess wear in the middle means they are over inflated?(not 100% sure on this)

Yeah I hate to admit it, but I pulled a typical rookie move and forgot to take hot pressures. I was at 28psi cool, but I completely forgot to grab pressures after I came off the track.