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Thursday, April 24, 2014

Doug's Domain

Doug Vetter, ATP/CFI

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Friday, November 7, 2003

I just had my second windshield installed, and decided to write a short article to update the original. Check them out.

Thursday, November 20, 2003

The 2nd set of Dunlop SP8000's are spent. The rears are at the tread wear indicators, while the fronts have about 1/16" above them. As I've been pondering for some time whether to go with another set of SP8000s or try a new tire, I let these wear farther than the last set. As a result, I've really noticed a decrease in wet performance as well as a significant increase in tire noise. Considering that the tread now resembles a DOT legal racing slick, that's no surprise.

The main reason I'd considered going with a different tire is because this set of SP8000's was particularly out of round. When I brought the car to my mechanic shortly after they were installed at another local shop, he said he balanced the tires as best he could and moved the worst two the rear, where I would not feel them as much. He also strongly suggested I NOT buy Dunlop tires again.

When it became clear I'd need to look for new tires recently, I went back to him and asked for his opinion. He said that he balances tires all day long on a Hunter RoadForce balancer, which can measure the eccentricity of the tire in "lbs of road force differential". A perfect tire would present 0 lbs of differential, while a bad tire might between 30 and 40 lbs. He added that Dunlop and Bridgestone, for example, are all over the place...some good, but mostly bad (anywhere between 20 and 35lbs, with some as bad as 40). He said Continental aren't too bad, but Michelin are the best...at around 3-5 lbs on average.. BMW specifies a maximum of 18 lbs. So, what to do?

I initially considered many tires, including a promising alternative for the SP8000 - the Kumho ECSTA MX. But after weeks of on and off analysis, with emphasis on finding a tire with low eccentricity, I worked it down to one of the two Michelin Pilot Sport tires. The original Pilot Sport is a summer-only ultra high performance tire that comes on the newer sport-package BMWs, while the Pilot Sport A/S is Michelin's all season equivalent.

I really wanted to go for the summer tire, but two things stopped me.

The good news is the A/S came highly recommended. Nearly all personal reviews I read about this tire raved about its performance in dry, wet, and (yes) even snow. The downside? They're EXPENSIVE. Tire Rack had them for $180 each + shipping, or a total of $750...which is a LOT of money for tires that I'll likely replace in 18 months or 30K miles. Just for grins, I asked the dealer's parts guy how much they would charge for these tires and he said $250/each(!). When I mentioned Tire Rack's price he said that he would call Tire Rack if it were his choice, and added that I should have the tires shipped directly to the shop for installation. So I shall.

While they have the tires off, I plan to have them do front pads and rotors (still a bit ahead of schedule, but better to do before the holidays, IMHO), do the biennial brake fluid flush, and a mid-cycle oil change. Total bill will likely be around $1200.

Oh, and incidentally, I'm not fooling myself -- I know that these tires will NOT have the dry performance of the SP8000's. You need only look at the respective treads to see why. I am also concerned about more rapid tire wear on the Pilot Sport A/S, in spite of what I have read to the contrary. If the tire significantly impacts dry performance, next spring I will either buy a set of Pilot Sports or other tire I can burn up during the summer and swap the tires on the existing 16" rims, or I'll buy the 17" M-Contour rims (available on the E36 M3) and put the summer rubber on those. That way, at least, I can swap the tires on my own, and I'll improve the looks of the car as well. And, before you suggest how much THAT will cost, it's STILL cheaper than a second car. Been there, done that, got the t-shirt.

Cost (parts): $750, Mileage 87005.

Tuesday, November 25, 2003

THIRD windshield replacement

Yes, I had the (two-week-old) windshield replaced again, except this time it wasn't because of a stone hit...it was because I realized they didn't install the last one properly.

During the installation two weeks ago I noted that the windshield seemed to be sitting low in the frame, although it appeared centered laterally. I gauged this by looking at three factors:

When I tried to point this out to the installers they tried to pull the windshield up in the frame but it didn't want to budge. They did manage to close the gap a bit but that still left the window another 1/8" below where I felt it should be. When I made it clear to them that I didn't like the way it looked they commented that the extra gap would disappear behind the trim once it "relaxed" and conformed to the frame over the next day or two, but in case it didn't the lifetime warranty on materials and workmanship would cover the installation and they would come back to fix it for free. Naturally, I'm sure they didn't think that I would call them on this, but I did.

They hoped to save the existing glass, but ordered new glass just in case that didn't work out...and it didn't. They had the usual difficulty removing the glass and cracked it, so the new glass was installed. This time, they took special efforts to orient the glass before seating it, and pushed it firmly to the top of the frame BEFORE they pushed down on it. They also used a high-strength red fabric tape (as opposed to the blue painter's tape they normally use) to hold the windshield where it should be. My experience shows once the glass touches the glue and is in the frame, the friction created by both the glue and the rubber trim kit just won't allow the windshield to budge much, if at all so it needs to be set correctly from the start.

This installation actually looks better than the one they did two years ago, and in fact looks the way I remember the original did. The windshield appears to be "level" with the top of the windshield frame, rather than recessed slightly, and the rubber trim sits, appropriately, level across the windshield and the windshield frame. The trim on the top of the windshield also nicely hides the paint defect created by the old trim. In short, the windshield is where it should be.

I did note that the VIN# window is still a bit low, but that's obviously a glitch of the windshield manufacturing process, rather than the installation process. The windshields acquired in the last two weeks were made by the same manufacturer for BMW, but the logos and other writing on the windshield seemed to be in a different font, meaning this is a new "rev" of this windshield. Fortunately, I couldn't care less about this...let the cop, inspection station attendant, or whoever wants to verify my car's identity, bend over and squint a bit more to see it.

Now, the question I'm sure you're begging to ask -- would I use Quality Auto Glass again? Sure. They screwed up, but remedied the situation. I was out nothing more than a few phone calls. They were good about coordinating the installation time with me, and were generally cool about making things right.

P&L: $0, Mileage 87178