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BMW 535i test drive

The other day I test drove a 2011 BMW 535i. With the updated body style, this car was the first one after a long time that visually appealed to me. I had already driven the 6 cylinder twin turbocharged engine in a 335i a while back. I thought this would be an adequate match for the 5-series. The powertrain produces 300hp and was mated to a six speed manual gear box. This is rather unusual in the US, so I was eager to try this exotic combination. The car came with the luxury and sport package (not the M sport) and was well equipped. My first impression was that the power was in fact adequate, if though a tiny turbo lag could be felt. The six-cylinder ran noticably rougher than my V8 in the 740 but it had no problems propelling the vehicle forward with acceleration rates for driver enthusiasts. The gear box was no match for the refined cabin and subdued sounds from the road though. A jerky clutch with a short stick to switch between gears felt a little out of place in this luxury sedan. Another point I was curious about was the electric steering of the car that has been berated by the press. I have to say that I found it to work flawlessly and precisely with good feel for the road. At no point did I feel disconnected from the road or did I find the steering overly sensitive. Up to 80mph the steering behaved well and felt just the way you would expect. I can’t comment for higher speeds as encountered on the Autobahn.

The engine had enough power to spin the tires in second gear and to shift through the first three gears rather quickly under full power. The engine noise was present at all times and there was an always present slight growl from the rear exhaust pipes – nothing bad, just present …

When I parked the car I felt that BMW had delivered a fine product, though none that swept me off my feet. When I returned the keys to the sales person, he told me that I had to also drive the sports version of the car with the automatic gear box. He talked about the independent power settings, suspension setups and gear programs, enough to get my curiosity up. So I said I’d take the second 535i only around a block – and I’m glad I did. Wow, this combination is just ideal for this car. In pure sports mode, it puts out more power, shifts late and firms up the suspension so you really feel the track – I mean road. You can choose to keep the power train setup in sport, but select “normal” or “comfort” for the suspension for a more comfortable highway ride. The car is eager to downshift two gears at a time, if power is demanded by a firm pressing of the pedal to the metal. The car is well planted on the road and quite relaxed at highway speeds. Not completely as regally as my 740, but close.

There were some disappointments, too: the nav-system doesn’t live up to it’s expectations. Any Android handheld device works better – sad, considering the navigation package is a $2k+ extra. I was able to operate the iDrive system without instructions, so you could claim it works, but it’s cumbersome. Selecting the A/C temperature with old fashioned dials for each zone felt so much better – I’m glad BMW kept those. I’m not a fan of the self-canceling signals nor of the electric hand-brake. (Although the seamlessly working hill assist, when starting in 1st gear uphill was a welcome surprise). The high protruding arm-rest is not visually appealing, but works well while driving. The fit and finish has a good feel to it, but lacks high end class that I would expect in this category. My 10-year old 740 has some higher quality controls than this brand new 535.

On the upside, BMW has added memory seats for the passenger seat and an automatic trunk lift gate that works well. The side camera and rear view camera are a nice touch, though pricey.

I’m glad I drove the second car with the drivetrain meant for this vehicle. A manual gearbox just felt a bit out of place. If it wasn’t for the $63900 price tag of the vehicle, I would consider one of these machines.

But getting back in my 10 year old 740iL and driving off the lot, produced a big grin on my face, because the torque of the V8 was still superior to the 535 turbo and the smoothness unsurpassed. All that for a sixths of the price – and some increased maintenance cost, I might add. But that’s a trade-off I’m more than willing to live with, as the cost for maintenance is still significantly lower than the depreciation of a new car. Even with an attractive lease for the 535i, I’m still coming out ahead with the 740iL, financially. So the 740iL lives on…

 

Baby Logic #4

When we were driving yesterday, Ro said: “Look, break, the trees are green!”.

!!?!

MrsM and I were looking at each other, just trying to figure out what that should mean. I went on to fill in with “yes, the trees are green!”. But Ro insisted: “yes, break, green trees”.

MrsM and I both agreed to just let go of this, when it dawned on me that “spring break” had just finished the week before and we had mentioned it many times, because we love the light commute traffic during this university free time. So he had connected the word “spring” and “break” and used them interchangeably to describe the green trees. So cute. So glad I could figure his little mind’s logic out. He’s learning from anything we say. Can’t be careful enough…

 

Level of abstraction in electronics

When asked by a non-engineer what I’m doing for a living, I’m usually struggling to describe my work. I usually recind to asking them if they know Netbooks and that I worked on the CPU (“the brain”) for these.

But when an inquisitive mind is dissatisfied with this answer I usually tell them that I develop chips that work with elements just like relais. And on an abstracted level that’s true. It’s just that the layers of abstraction involved are many:

1) Transistor level (the switching element -> the relais)

2) Gate level (logic functions like AND/OR/NOT)

3) single bit storage elements like flip-flops as well as multiplexers

4) multilevel logic gate combinations, forming ADDERs, ALUs, SHIFTERS as well as memory blocks and register banks

5) memory subsystem blocks, like caches, translation tables

6) processor input/output cells

7) integrated systems with peripheries on chip (think network adaptor, external memory controller, graphics adapter)

8 ) PCB boards that mount these chips and connect them to external power

9) the final system: like netbooks, PCs, cell phones – the stuff you touch and use

I spent most of my time at work on items 2)- 5). While the chips we produce, consist of hundreds of million of transistors, on a basic level the still work with switches – not more and not less.

Baby logic – #3

Ro <pointing to my face>: Daddy, blue Oh’s!

<pause, me looking confused>

Ro <still pointing to my face>: blue circles!!

Me: Ah, you mean I have blue eyes!

Ro <now desperate>: blue Oh’s, Ohhhh’s !!!

Then it dawned on me that the blue eyes are in fact round like the letter O that we’ve just learned and played with the day before. So he saw the new letter right in my eyes! I just had to hug him for this one – so cute!

cut.

When you want Ro to move into a certain direction, the best way to instruct him is to tell him: “I’ll follow you” and then to tell him, where you’re going to follow him to. Works perfectly. He loves to lead!

Baby logic – #2

Me: See that circle with all the dots? That’s where the music is coming from. It’s a loudspeaker.

Ro: Ah!

<pause, then Ro is pointing to a different perforated circle>

Ro: Loudspeaker!

Me: No, that’s not a loudspeaker, there’s no music coming out of there.

Ro: Ah! – Quietspeaker?!?

Baby logic #1 – Quotes

May 12th, 2011: I’m reposting this entry from my website on the blog, so that all “Baby logic” entries exist in one place. This entry started the whole series…

  • After trying to fall asleep for an hour, Rohan finally calls us. When I walk into his bedroom he tells me with a very serious face: “Daddy, my eyes are not tired!
  • After my BMW broke down and was towed, Rohan asked the next morning: “Is the blue car at the doctor?”

Lately, he’s using “Friday” for events in the past and “Wednesday” for things to come. So a typical conversation goes like this:
Rohan: Is it my birthday?
Me: Not yet, but soon.
Rohan: My birthday is Wednesday!?
Me: … could be. 🙂 Did you have fun today? Did you play with your friends at school?
Rohan: Yes, I played with Adi and I flew in an airplane.
Me: No, you didn’t fly in a plane today, but we all went on an airplane a couple of weeks ago.
Him: Friday?!?