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E85 / E86 Z4 (2003-2008)
E85 Z4 convertible and E86 Z4 coupe talk with our BMW gurus here.

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  #1751  
Old 10-11-2011, 03:38 PM
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Palantirion Palantirion is offline
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On a more technical note, Saturday was the second time I'd tracked the new Michelin Super Sports on pavement. I had tracked them for 3 laps on concrete at El Toro with OCRC, then with BMWCCA at Auto Club Speedway's infield course, and now at Willow. I noticed no wear from OCRC, but the wear in the pic below surprised me. This is from one day at Auto Club:


I've worn out plenty of tires in my day, but never seen chunking like this without corresponding "gummy" sections from over heating the tire. This was running the same suspension and tire pressures as I did at OCRC. The tires felt great at OCRC, but didn't feel particularly good at Auto Club - more squirmy. I suspected that perhaps I was running too much bump and that this was putting too much energy into the front tires. So as a quick experiment I added 2psi to each front tire (to stiffen them) and added a 1/4 turn of rear rebound (to slightly reduce longitudinal load transfer to the front). This had a marked improvement on front grip and contact patch predictability. But there were no more sessions left to try other suspension changes.

At Willow I noticed more significant chunking, but also a fair amount of heat and conventional wear. Here are the fronts at the end of the day (after being swapped left-to-right 1/2 way through the day).




I also reduced the bump 2 clicks, added an additional 1/4 turn of rear rebound and let 2psi out of the front tires. The car handled much better, and the wear seemed to then cover more of the tires' face instead of just wearing the middle. Still, this is a lot of wear for just two track days - particularly on a street tire designed specifically to be durable on the track.

The rears show very little wear, even though they were seeing more extreme pressure and heat cycles than the fronts. They were consistently getting hotter than the fronts and would lose grip slowly and predictably throughout a session whereas the fronts' grip remained pretty much constant:


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Last edited by Palantirion; 10-11-2011 at 03:43 PM.
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  #1752  
Old 10-11-2011, 03:44 PM
imager993 imager993 is offline
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Damn, I just missed you. I was there on Sunday.

I managed a 1:37 with my stock setup on street tires but was running consistent 38's and 39's later in the day. Definitely was a perfect weekend at WSIR though - great weather and very light traffic.

Shame the stars didn't line up just a bit better to be able to run with you.





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Last edited by imager993; 10-11-2011 at 05:30 PM.
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  #1753  
Old 10-11-2011, 05:11 PM
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Palantirion Palantirion is offline
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Originally Posted by imager993 View Post
Damn, I just missed you. I was there on Sunday.

I managed a 1:37 with my stock setup on street tires but was running consistent 38's and 39's later in the day. Definite was a perfect weekend at WSIR though - great weather and very light traffic.

Shame the stars didn't line up just a bit better to be able to run with you.
-Yeah, damn! Would have been great to be there with you.
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  #1754  
Old 10-12-2011, 05:31 PM
klin klin is offline
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Originally Posted by Palantirion View Post
I've worn out plenty of tires in my day, but never seen chunking like this without corresponding "gummy" sections from over heating the tire. This was running the same suspension and tire pressures as I did at OCRC. The tires felt great at OCRC, but didn't feel particularly good at Auto Club - more squirmy.
What was the tread depth are your tires? I shave the street tires that I also autocross in, to make them last longer (6/32). The squirm means your tread blocks are moving which generates heat -> chunking.

http://www.tirerack.com/tires/tirete....jsp?techid=67

Last edited by klin; 10-12-2011 at 05:35 PM. Reason: Adding quantitative information
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  #1755  
Old 10-12-2011, 11:50 PM
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Originally Posted by klin View Post
What was the tread depth are your tires? I shave the street tires that I also autocross in, to make them last longer (6/32). The squirm means your tread blocks are moving which generates heat -> chunking.

http://www.tirerack.com/tires/tirete....jsp?techid=67
-I am familiar with shaving tires. In this case it would have defeated the purpose of tracking the street tires. As mentioned above, I would have thought that there would have been more visual evidence of overheating in conjunction with the chucking. Particularly in the pre-Willow garage pic it looks like the tires chunked without significant heat buildup.
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  #1756  
Old 10-19-2011, 07:12 PM
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Ron Stygar Ron Stygar is offline
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-Ron, got any tips or suggestions on what I will need to do to convert from non-heated to heated seats?
From Z4POST:

http://wds.spaghetticoder.org/
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  #1757  
Old 10-19-2011, 10:48 PM
ahrdyrxkd ahrdyrxkd is offline
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wow!

Last edited by ahrdyrxkd; 10-19-2011 at 10:49 PM.
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  #1758  
Old 10-19-2011, 10:51 PM
ahrdyrxkd ahrdyrxkd is offline
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Wow that's awesome
How did you get a "4" micro antenna? it is pretty cute. Could you advice me how can I buy it?
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  #1759  
Old 10-20-2011, 02:01 AM
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Palantirion Palantirion is offline
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Originally Posted by ahrdyrxkd View Post
Wow that's awesome
How did you get a "4" micro antenna? it is pretty cute. Could you advice me how can I buy it?
-Check Scatha's website: www.mymcoupe.com (exterior section)
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  #1760  
Old 10-20-2011, 08:28 AM
STIHLBOLTS STIHLBOLTS is offline
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Has anyone successful done a heated seat refit?
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  #1761  
Old 10-25-2011, 02:54 PM
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Palantirion Palantirion is offline
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Originally Posted by STIHLBOLTS View Post
Has anyone successful done a heated seat refit?
Dunno. Perhaps I'll be the first?

A more recent development for my Z4 has been treating the paint. After testing a 540 fender (that I painted with acrylic) at Meguiar's I decided to treat the paint on the Z4 using what I learned from that night. The acrylic clearcoat is much more resilient than I expected.

The process I used was red pad with Ultimate Compound, usually two (heavy) applications, followed by black pad with #7 glaze, followed by Tech Wax applied and removed by hand with a rough microfiber applicator (closer to terrycloth) and microfiber buffing cloth.

The interesting thing about this paint is that it requires a long tooth on any towel to really get into all the texture of the paint. Conversely, the paint is so elastic that it's very hard to scratch. So this is a rare circumstance in which a terrycloth rag is better than microfiber.

Here are a couple before/after pic sets that show the effect of this work. Note that the goal is not to eliminate the brush marks, but to bring a more even gloss to the paint.

Before:

After:


The trunk half the blue area has been treated, the roof's half has not:


Before:

After:


Before:

After:


Overall the paint colors are more vivid and the finish is more glass-like. To describe using Home Depot's interior finish chart I would say it's gone from a 3 (satin) to a solid 4 (semi gloss).
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  #1762  
Old 11-24-2011, 08:53 AM
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Earl - Looking at the wear on your Pilot Super Sports, it makes me wonder if that is a combination of 2 "new" features of this tire. The first is that Michelin have reduced the "dry" compound on the outer tread to 20% of the total tread face from 50% on the PS2s (the remaining inner is more geared towards wet/lower temps) - this makes be believe that now a larger portion of the tread will not withstand higher temps seen under dry conditions compared to PS2s. This will most likely be exacerbated by the Twaron liner on the Super Sport that is designed to keep more of the tread on the ground at all times.

I did 300 miles at Road Atlanta this past weekend on PS2s (my first time on these tires) and was pleasantly surprised at the grip levels, communication and breakaway character of these. I will take some pics of the tread after the Turkey Day coma tonight to see how they look for wear - I most definitely heated them a lot on some sessions where I had to back off for a couple of laps to let them cool down and come back to initial grip levels.

Happy Turkey Day 'festers!
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  #1763  
Old 11-25-2011, 08:53 PM
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Palantirion Palantirion is offline
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Originally Posted by pal View Post
Earl - Looking at the wear on your Pilot Super Sports, it makes me wonder if that is a combination of 2 "new" features of this tire. The first is that Michelin have reduced the "dry" compound on the outer tread to 20% of the total tread face from 50% on the PS2s (the remaining inner is more geared towards wet/lower temps) - this makes be believe that now a larger portion of the tread will not withstand higher temps seen under dry conditions compared to PS2s. This will most likely be exacerbated by the Twaron liner on the Super Sport that is designed to keep more of the tread on the ground at all times.

I did 300 miles at Road Atlanta this past weekend on PS2s (my first time on these tires) and was pleasantly surprised at the grip levels, communication and breakaway character of these. I will take some pics of the tread after the Turkey Day coma tonight to see how they look for wear - I most definitely heated them a lot on some sessions where I had to back off for a couple of laps to let them cool down and come back to initial grip levels.

Happy Turkey Day 'festers!
-What you say makes sense, but is counter to the purpose of the SS as a tire that is supposed to have better track durability than the PS2.
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  #1764  
Old 12-10-2011, 10:25 AM
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Palantirion Palantirion is offline
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It's been a quiet pre-holiday season for Scatha. We'll be at Buttonwillow on 12-19 with Speed Ventures. Should be a fun day with very low car counts and too much track time! Zach's article about Scatha for Total BMW should be coming out any time now...
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  #1765  
Old 01-13-2012, 10:56 PM
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03BeastCharmer 03BeastCharmer is offline
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Originally Posted by Palantirion View Post
It's been a quiet pre-holiday season for Scatha. We'll be at Buttonwillow on 12-19 with Speed Ventures. Should be a fun day with very low car counts and too much track time! Zach's article about Scatha for Total BMW should be coming out any time now...
My Total BMW arrived today!!!!,
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  #1766  
Old 01-14-2012, 02:38 AM
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Palantirion Palantirion is offline
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My Total BMW arrived today!!!!,
...AND? I haven't seen it on shelves yet
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  #1767  
Old 01-15-2012, 09:01 PM
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It's a nice three page article that goes over the different modifications, and the inspiration for the two themes in the paint. They have a picture looking into the car through the drivers door which I don't think is a good photo. Also a nice small picture on the cover.
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  #1768  
Old 01-19-2012, 01:52 PM
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Palantirion Palantirion is offline
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It's a nice three page article that goes over the different modifications, and the inspiration for the two themes in the paint. They have a picture looking into the car through the drivers door which I don't think is a good photo. Also a nice small picture on the cover.
-I'm still trying to get some copies, no bookstores around here carry Total and more. How did you like the article?
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  #1769  
Old 01-23-2012, 03:45 PM
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Check your e-mail. Let me know if you want my copy of the magazine.
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  #1770  
Old 01-23-2012, 03:53 PM
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Palantirion Palantirion is offline
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Check your e-mail. Let me know if you want my copy of the magazine.
-Checked. Thank you!
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  #1771  
Old 01-25-2012, 11:27 AM
EenyBear EenyBear is offline
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Originally Posted by Palantirion View Post
Dunno. Perhaps I'll be the first?
Maybe...

Here's a link to the "installation of power seats" thread. Posts #15 and #16 go a long way towards understanding the "heat" circuitry. Have fun!

http://www.zpost.com/forums/showthread.php?t=521977

You'll make a lot of new friends if you post a good "step-by-step" of your adventure. I suspect the seat swapping will increase in frequency as our cars age and seat mods become more common.

Cheers.
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  #1772  
Old 03-16-2012, 08:56 PM
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Palantirion Palantirion is offline
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Thanks for the link EenyBear.

I've just finished updating the MyArtCar gallery if you want to see new pics from the track and other local events.
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Last edited by Palantirion; 03-16-2012 at 08:57 PM.
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  #1773  
Old 05-01-2012, 05:59 PM
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Palantirion Palantirion is offline
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A new post on Scatha's Art Car thread, showing paint repair: http://www.bimmerfest.com/forums/sho...38#post6808038
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  #1774  
Old 05-22-2012, 05:28 PM
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Palantirion Palantirion is offline
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Scatha at Bimmerfest 2012: http://www.bimmerfest.com/forums/sho...39#post6850839

I posted it on the Art Car thread instead on this mod thread. But in case you fear that this thread is running aground be assured that there are several "real" mods planned for 2012 that will appear with the usual documentation.
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  #1775  
Old 06-01-2012, 04:16 PM
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Palantirion Palantirion is offline
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Scatha v1.1
http://www.bimmerfest.com/forums/sho...=1#post6870828
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