u/LlaughingLlama

First Time with TW200 (RZ) Tires; What should I "get ready" for? How should I drive differently?

So this coming weekend will be the first time I've done this with TW200 tires, specifically RE71RZ's. So far this year I have 6 weekends and about 90 runs on 5-year old Michelin Pilot Sport 4s's (which were finally at end-of-life), and I've been coming along nicely and improving things, and I feel like this is a reasonable "next step" ...

That said, I have read MANY times that tires like this are "a game changer" and "will take A LOT of time and practice to get used to" to take full advantage. Great!

So then, could any more experienced drivers try to explain how I should be doing things differently? What old behaviors should I try to not repeat? What new behaviors should I my trying to do? Any other advice or tips? Thanks!

reddit.com
u/LlaughingLlama — 21 hours ago
▲ 7 r/bmwz3+1 crossposts

More Videos from San Diego SCCA AutoX; Saturday Practice + Sunday Event

So in an attempt to improve, I'm posting my weekend's autox videos for all to enjoy/roast me on. For your amusement, I give you:

Saturday's 10-run Practice Day: https://youtu.be/qJRXAheVeAQ

Sunday's 4-run Official Event + 4 Practice Runs Day: https://youtu.be/_wGp9IcXCjg

I signed up for the online AutoX course "Beyond Seat Time" last month, and I've been pleased with it. It's given me useful tactics and strategies, backed by math and delivered by an instructor with (what seems to me) a credible background. This was my first autox since taking the course, and I felt significantly improved and feel like I recognize what to work on next. I feel like its $70 price for 3+ hours of content is a good value.

youtu.be
u/LlaughingLlama — 13 days ago

Best Place to Buy Potenza RE-71RZ's these days?

Thanks to an ABS malfunction (see: ABS: The Tire Saver. Or...I finally get to upgrade my tires... : Autocross ) I get to upgrade my Michelin PS4S's ahead of schedule! Woohoo! The Potenza RE-71RZ is the new hotness, so I'm looking to get a set, but from where?

I was just going to head over to Tire Rack again, but just this weekend, someone told me that Costco can get these now. Really? I'll call later today and see, but that got me thinking about how there could be some other good alternative sources.

So, can anyone suggest alternative sources I should look into for a set of RZ's? I'm in Orange County, CA, in case anyone has a local source worth visiting instead of getting them shipped.

reddit.com
u/LlaughingLlama — 14 days ago

ABS: The Tire Saver. Or...I finally get to upgrade my tires...

So my 2000 BMW Z3 has a slightly finicky ABS computer - once in a while the computer will say "WTF???" and turn itself off, and the ABS light shows up on the dashboard. The easy fix is to reset the computer by disconnecting the battery for a few seconds, which I have made easier with a quick battery disconnect switch. But...I have to get out of the car to rotate the switch off and on. Anyway, in the grid this weekend, I noticed the ABS light was on JUST before my run, so I decided to do my reset AFTER my next run, and of course...I gave it 100% and there was a hot corner where I locked up the brakes and flat-spotted one of my otherwise well-worn-but-evenly-worn PS4S. You can actually see the flat spot based on groove depth and tire wear bars. To say nothing of the visible cords.

Further up the tire, still on the inside, you can see a few extra chunks taken out for good measure.

I reset the computer and kept at it the rest of Saturday and then did 8 more runs on Sunday - all good, but you can hear and feel the flat spot on the freeway. I've been meaning to replace these with a nice set of RZ's later this year, so now "later this year" means "immediately." Oh, darn.

But anyway, I was thinking this might serve as a fun public service notice to be aware of how ABS can and does save your tires from locking up, flat spots, and flat out tire destruction. Needless to say, after the RZ's go on, I will NOT EVER go out on a run with ABS not working. Or if I do, it'll be an easy run.

u/LlaughingLlama — 14 days ago

Asus CM30 ChromeOS Tablet Quick Review - Surprisingly OK in 2026 for ~$150

So I like ARM-powered ChromeOS Tablets (I've bought and returned 3 in the past, such as the OG Lenovo Duet and the Acer Chromebook Tab 10, keeping one). I also like ARM-powered Android tablets (I have two). I also love my Microsoft Surface Pro 7+ (which I use daily, and which still works well for me) and the "tablet with a kickstand and a keyboard cover" form factor. And if you like these sorts of devices and this sort of form factor, and you need an inexpensive and lightweight device, then the current refurb deal at StackSocial for the Asus CM30 is really good for a really okay device.

The StackSocial version of this device has 8GB of RAM and 128GB of storage, and the legends on the light gray keyboard are black, and this is the better version than you can find elsewhere with half the ram/storage and nearly invisible white legends on the keyboard. Mine arrived from StackSocial in a generic box and without the USB power adapter, but it otherwise looked like and felt brand new. It had been powerwashed (or never used, I suppose) and firing it up and logging into my Google account worked quickly and like it was factory-new. It will get ChromeOS updates until 2033.

Speed is...okay. I typically have 10 tabs and a couple of PWAs open all the time, and switching between them is reasonably quick unless it is a very busy or CPU intensive website, and then it takes a second or two to switch, which I consider okay. Its Speedometer 3.1 score is about 4.7, compared to a score in the mid 6's for my Surface Pro 7+ on battery, and about 13 when it's plugged into AC power. Yes, it absolutely feels slower than my Surface Pro, and certainly slower than my desktop PC, but when I am not expecting a rocketship, it's non-rocketship performance is totally okay. Full screen HD Youtube videos don't drop frames, which is another benchmark of sorts. Microsoft Office 365 is necessary for my work, and obviously you have to use it within Browser windows, and I find it just barely fast enough to only be very slightly annoying to use Word and Excel and OneNote and Outlook. PowerPoint is a bit more annoying. Video meetings on Teams even moreso. I would be consistently annoyed using Office 365 on this as my only device to do serious work, but another perspective would be: I can't believe I was able to edit that spreadsheet file and send it back via OneDrive and update my Outlook Calendar and participate in a Teams video meeting at all on a lightweight $150 device with 8+ hours of battery life.

The Google Play Store works as expected, and over the years I have embraced a roster of Android apps which work well in ChromeOS and Android tablets, and they still work great here. There's no need to emulate an ARM processor with an Intel CPU here because the CPU IS an ARM processor. Linux works fine for me too, but I really only use it to sideload Android apps not on the Play Store, so I can't speak to it any more than this. Android apps other than games run as if on an midrange Android tablet. I don't do Android games, so...

The screen measures 10.5-inches diagonally, in Full HD and 400 nits brightness, and streaming content looks really good - I use PWAs but the various Android apps work fine too. Speakers are a little tinny, but they are loud enough, and there's a real headphone jack for wired headphones, and Bluetooth speakers and earbuds work fine. It comes with a rear cover that magnetically attaches and has a kickstand - it's fine, though it only works in "landscape" (wide) mode, which you either won't care about or will be a dealbreaker. The screen cover is also a keyboard, also attached magnetically, and while it doesn't feel as good as the Surface Pro keyboard and it doesn't magnetically "tilt" and instead lays flat on the table or lap, it is perfectly OK. It's maybe 95% of full size. There's a plastic trackpad, and it is also perfectly OK, and does multi-touch gestures. I'm getting battery life between 8-11 hours. The front- and rear-facing cameras are perfectly fine if not awesome; the front is fine for Zoom calls, and the rear scans QR codes fine, and that's really all I need from the cameras on a tablet like this. It comes with a stylus, living inside its own internal garage so you won't lose it easily. It is pressure sensitive to more than 1000 levels in theory, but in practice most apps don't sense them, and those that do only seem to see about 4 different pressures. Palm-rejection while writing with it seems dependent on the app you're using, but it still works well enough for annotating or signing PDF files or making basic sketches or drawings in Keep or OneNote. I don't think it is suitable for serious artwork. The paid Android app SuperDisplay works well to make this a portable external monitor for a Windows computer.

Negatives - other than it not being rocketship fast, it is a bit heavier than you would expect - the front and rear covers are not especially thin or lightweight. The tablet by itself is 610 grams, but add the covers and it balloons to 1000 grams (1 kg)! There's only one USB-C port, and it is the sole charging port; I wish there were two with one on each side. And of course, there's the ChromeOS Tablet Mode; it's not nearly as slick or intuitive as iOS or Android, but if you're used to it and okay with it, then it's not really a negative. But if you're getting this primarily to use as a Tablet and like how the iPad works and have never used ChromeOS as a Tablet before, I bet you'll be disappointed at first.

The StackSocial deal is what makes this worth considering as a secondary, or extremely portable, or a coffee table/nightstand device, in my book. This is especially true if you like using Android apps. Over the past 4 months the price has ranged between $140 and $160 for these refurbed units, which again, seemed brand new to me. The screen and keyboard is a bit smaller than a traditional laptop form factor, but it is A LOT more portable. $150 seems like the RIGHT price for a device like this, and I would recommend it at this price point. $200 would be too much, and its original asking price is laughable. I was expecting to return it, but I am keeping it. I really like having a single compact touchscreen tablet device that lets me run both my favorite Android apps and full-desktop Chrome with all my favorite and necessary browser extensions.

I seriously do not have any connection to Asus to StackSocial or anything. I just hardly see anything posted about this device, and I think it fills a niche for a low-cost, compact, tablet form factor, 8GB/128GB ChromeOS device. Its product URL is: https://www.stacksocial.com/sales/asus-chromebook-cm30-2024-detachable-touchscreen-8gb-ram-128gb-emmc-refurb

reddit.com
u/LlaughingLlama — 22 days ago

Chalk Tread/Sidewall Photos - how's my pressire

Edit: Title should obviously be "pressure"

Hi Folks. Care to review my chalk marks on my tires to help me zero in on proper tire pressure? More air? Less Air? OK right here?

These are 17" Pilot Sport 4S on a 2900 pound BMW Z3. The Fronts were at 37 Hot (measured after my last run) / 32 Cold (measured the next morning), and the Rears were 41 Hot / 36 Cold. Camber is -2.5 front and -2.7 rear. Zero toe on the front.

Thank you.

u/LlaughingLlama — 1 month ago

San Diego vs Cal Club SCCA AutoX: Differences in Daily Organization affecting Ride-alongs. Your thoughts? What's more normal?

So this past weekend, I did a 2-day AutoX event with the San Diego SCCA chapter. I've done a few SCCA Cal Club AutoX events this year too. And I realized the way they were organized differently dramatically affects how easy (or impossible) it is to hop into other driver's cars to observe and learn, and to have other experienced drivers ride with me to give advice and instruction.

I wanted to get your thoughts - do I have this right?

In San Diego, they divided everyone into TWO run groups. Call them Group A and Group B. Group A runs while Group B works the course, and vice versa. Group A get 8 runs: the first 4 are timed, and the second 4 are fun practice. Then there's lunch. Then Group B runs (4 timed + 4 fun) while Group A works the course. Here's the problem: there is no unallocated time in this arrangement for someone to ask for rides from others, or to ask others to ride with you. Let's say I am in Group A: I can't just ditch my work responsibilities to go for rides with good drivers in Group B during their practice runs. And when I am doing my runs, all the other skilled drivers who could run with me are busy working. This was on Sunday of a 2-day event.

On Saturday, it was a practice day in the San Diego event, and there were actually 3 groups: Group A, B, and C. In this setup, there was indeed "off time" for one group at a time. However, the groups were made by car classes, so everyone in my car class was running at the same time as me, meaning I never had a chance to ride with or get riders from people in similar cars as me. And there were some other organizational problems which made getting and receiving riders troublesome, but let's assume that's a one-off.

Cal Club does thing very differently, and the difference allows for lots of riding with and accepting rides and advice from others. Cal Club single-day events divide the day with timed runs in the morning, and practice runs in the afternoon. Everyone is divided into FOUR groups: A, B, C, and D. You run in one group, work in another group, and then you have TWO time slots "off." Those two OFF groups allow for lots of rider sharing and learning if you find people doing "time only" runs in the morning, and you can easily walk around the course and observe how other drivers are handling the course too. And then in the afternoon they do 4 different groups NOT organized by class, meaning you still have two "off" groups to accept and get rides, and you still have a chance to find drivers in your own class.

As a result, I wasn't really able to get or give rides to other experienced drivers at the San Diego events, and I think I really need that. At Cal Club events, rides are easy to get by design, it seems.

And because of this, I am seriously considering prioritizing Cal Club events over San Diego events. The way San Diego does things, I might get a few more runs in on a given day, but I get those at the expense of being able to ride with other experienced drivers in similar cars to learn, or to have experienced drivers ride with me and give me instruction. More runs may be more fun, but I think I need more time as a passenger observing and getting instruction from a skilled passenger observer.

I know this was a long post, but I hope other more experienced people can chime in with their thoughts about how San Diego does things vs Cal Club. Your thoughts? Is there a "more typical" way of organizing days that you normally experience?

reddit.com
u/LlaughingLlama — 1 month ago
▲ 6 r/bmwz3+1 crossposts

Dashboard (Seltbelt?) Chime Playing during AutoX Runs....

So on this past weekend, something new happened in AutoX. During "High-G maneuvers," the dashboard warning chime occasionally sounds. It's the same sound as driving without a seatbelt.

You can hear it happen a few times within this run: https://youtu.be/yKcIAUCanFg?si=GCBcbFNeqhSK8Nhi&t=226, but it happened during every run at least once and sometimes more (so you can hear it throughout the video). It happened regardless of if there was a passenger in the passenger seat. When there was a passenger, they had the seatbelt on. I always had it on in the driver's seat. 

Anyone ever see this before, and have any suggestions as to what I should be looking at to fix it? It does NOT happen driving around town or on the freeway, and has NEVER happened before in AutoX. There are NO warning lights on the dashboard when this is happening (other than the traction control being turned off light being on), and the coolant level is fine and the temp gage is right in the middle.

youtu.be
u/LlaughingLlama — 1 month ago
▲ 35 r/bmwz3

Someone left this on my windshield this week. They even drew a little pic of MY car! How fun is that? This is totally a keeper...

It was NOT dressed for racing when it got this review, but here's what the car looks like...

u/LlaughingLlama — 2 months ago
▲ 7 r/bmwz3+1 crossposts

This weekend, SCCA Cal Club had its second Autocross in April at Angels Stadium. The day was dry, cool, and perfect. I got in 13 runs and took 4th place in my 2000 2.8 Z3, being beat by two S2000's and an ND Miata, all in 200TW autocrossing tires vs my Michelin PS4S's.

I invite all you Z3 lovers to enjoy the show, and I invite experienced autocrossers to provide me with constructive criticism so I can improve. To that end, I installed a new cheap camera to get the steering wheel in view.

Questions cheerfully answered. Thanks!

u/LlaughingLlama — 2 months ago