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Old 03-31-2011, 04:44 PM   #1
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Well, here we go.
My name is Tomas Larsson, Living in a town called Borå*, 70 km east of Gothenburg in Sweden.

What I do for Living, well, I'm a Refrigeration and Electronics Design Engineer.
Doing some software and mechanical design engineering as well.
Having two companies, one as a Refrigeration design Consultant, in the other one, we are developing new refrigeration systems, where I'm the Tech Director.

Anyway, that'* about the professional stuff.

On the private side, I'm driving two Citroen XM-V6-92 Break Exclusive ( a very funny car to be honest), one Citroen Xantia and one Pontiac Trans Sport-3800 1995 Minivan.
I do have a couple of old BMW bikes as well.

I have a large technical interest, therefore I launched a technical documentation respository (www.ebaman.com) a few years ago, currently there are some 7000 Users/service manuals within the respository, all available for free.
Mostly Electronic stuff (Instruments, HiFi and HAM-radio) .

Well, that'* a short description on myself.
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Old 03-31-2011, 05:04 PM   #2
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welcome to the site, i would be interested to see some pics of those cars, not really familiar.
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Old 03-31-2011, 05:33 PM   #3
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Welcome to the site.
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Old 03-31-2011, 05:49 PM   #4
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Well, The Citrone looks like any normal car, sort of, However its what under the bonnet that'* interesting.
Anyway, some Pics.
The first one is the XM, The second is the Xantia and the third, obviously the Trans Sport

The bonnet on the transport is open, because it broke down at that trip, one of the rubber hoses between the tranny and the air cooled oil-cooler broke
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Old 03-31-2011, 06:12 PM   #5
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Welcome to the GMForum, always great to have European members join us. We don't get alot but Sweden seems to be the majority of them. How old is old for your BMW? I had an 1956 R50 back as a young man. It had a R50 bottom with R60 top ends. The years of each unknown. I had a friend on Colorado with a passion for them and stacks of parts I built mine from. Not many here would know what an Earles fork was without looking. It made the bike a little tuff to corner but awesomely comfortable on the road and braking.
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Old 03-31-2011, 06:15 PM   #6
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One 1962 R60 with Steib LS250? -53? side-car and one R75/5 1971
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Old 03-31-2011, 06:51 PM   #7
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Nice. "Loius" had a 200 (similar to yours) and the 350 (Bulletnosed). Wouldn't consider giving one up as "their so rare". And that was 25 years ago.
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Old 03-31-2011, 06:55 PM   #8
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Yeah, they are quite cool, however, those bikes are for the moment a project when I do retire some time in a very distant future.
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Old 03-31-2011, 07:09 PM   #9
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Wikipedia has some interesting info on cars, i was looking at yours and the suspension is very interesting
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Old 03-31-2011, 07:52 PM   #10
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Yes, the suspension amongst other things are very interesting, and quite astonishing.
There are no traditional chock-absorbers and no springs.
Everything works on hydraulics.
Technically, the suspension consists of a sphere approx 100mm in diameter.
The sphere is dived into two chambers by a rubber diaphragm, on the top side, its pressurized with nitrogen, up to some 40 bars or so (depending on sphere type) and the other chamber is filled up with hydraulic oil.
The sphere is mounted on top of the strut, (in reality a hydraulic piston), in the connection between the strut and the sphere there are two non-return valves and a number of orifices, connecting the spheres bottom chamber to the strut.
The piston (and the spheres bottom chamber) is supplied via a valve with hi-pressure oil.
The springs one have in a normal suspension is formed by the hi-pressure oil, the diaphragm and the nitrogen pressure.
The chock absorbers is formed by the non-return valves and the orifices (different sizes on the flow going into the sphere and going out).

The valve I mentioned that supplies the pistons and spheres with oil is actually what is called the Height corrector, connected to the antiroll-bar, its function is to supply or drain the piston/sphere with oil depending on the anti roll- bars movement, giving a constant driving height an unparalleled smooth ride.
Now my car has something extra, active suspension, meanin that there is an suspension ECU that controlls the suspension, and makes it softer or harder depending on road and driving conditions, so when driving fast and/or doing hard cornering, the suspension goes extremly stiff, like an extreme sports-car, when cruising in town, its soft like a limo.

But, hang on, it doesn't stop there, there is adaptive steering as well, adjusting the steering force depending on speed.
As if that wasn't enough the steering is a fully servo controlled, meaning, that there is no physical connection between the steering wheel and the road wheels. (sort of drive by wire).
This steering system is quite amazing, it means that regardless what'* on the road, the road wheels always points in the same direction as the steering wheel, i.e. if you run on a kerb-stone or something else, in a normal car, the steering wheel could be forced out of your hands, it cannot happen in this system.
And finally, fully servo breaks, meaning that there is no main break cylinder, just a break valve, that feeds the brake-cylinders with high pressure oil, when actuated. The brakes on the rear wheels are load-assisted, meaning that the more load you put in the trunk, the more brake-pressure is diverted to the rear wheels.

Basically this car is an engineers wet dream and at the same time a total nightmare.

The top notch Xantia have al of above except the steering system (it has traditional servo-assisted steering), but it has two extra things, an active computer controlled antirollbar and passive rear wheel steering. (not my though).
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