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Old 20th October 2013, 20:11   #16
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Default Re: 50:50 Weight Distribution: Marketing gimmick or the real deal?

In a normal FERW car, will we gain or loose (on the handling front) by moving the gearbox from the engine end to a rear transaxle? It will help (static) weight distribution, but mostly be detrimental for moment of inertia.

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Old 22nd October 2013, 00:25   #17
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Quote:
Originally Posted by smartcat View Post
So what's the point? Isn't it all marketing gimmick or am I missing something here?
Modern day cars come with rigid chassis combined with a well designed suspension setup. This is often coupled with a Dual braking circuit, equipped with features such as ABS / EBD / ESP / ASR / TCS.......Etc.

Logically, with majority of the weight between the two axles, as long as the CG is low and the weight distribution is not overly uneven, it should not make a lot of difference to handling / Stability. Overhang on either front or rear ends, a Higher CG; can make a difference.

But practically speaking, weight distribution can be effected by so many factors, as discussed earlier in this thread. Therefore, only "50:50 weight distribution", does not make sence.. Battery can always take its logical place.

IMHO, sports cars meant for tracks, can be designed with 50:50 weight distribution, since average weight of a single driver and the average amount of fuel can be safely considered for calculations...

BMW cars are a combination of a lot of things - They are extremely well designed and engineered, oozing with quality. I wish things were as simple as just "50:50 weight distribution".

I honestly feel BMW has all the right to use such "marketing gimmicks".
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Old 22nd October 2013, 17:57   #18
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Default Re: 50:50 Weight Distribution: Marketing gimmick or the real deal?

My curiosity was piqued by the topic of the headline.

So the knowledgeable Professor Web throws up the facts, there are a number of factors involved in automobile handling, as discussed in posts above.

More specific to the topic there are 4 attributes to weight distribution:
1. Centre of Mass Height
2. Centre of Mass
3. Roll Angular Inertia
4. Yaw and Pitch Angular Inertia (Polar Moment)


Also found the relevant BMW Marketing Spin:
50:50 weight distribution.


The perfect balance of performance and precision: the ideal distribution of weight between the front and rear axles makes your BMW superbly agile.

In addition to the use of lightweight components the positioning of the axles as well as the package of aggregates and parts are essential for perfect weight distribution. The extended front axle and short overhangs permit the typical BMW rear drive – the optimal requirement for perfect vehicle balance. The heaviest parts are also placed closest to the vehicle’s centre of gravity. Well-balanced weight distribution is the basis for neutral self-steering properties, high agility and good traction even with heavy loads. This, combined with the Dynamic Stability Control (DSC), means your vehicle remains easy to control even in extreme situations.

Innovative processing and the use of light-weight components reduce the vehicle weight and contribute greatly to the 50:50 weight distribution. Depending on the model the front and rear axles or even the entire front of the vehicle are made of aluminium and hot formed steel. These high-tensile, extremely light materials and alloys containing magnesium are also used for single motor components. The combination of further lightweight components like a roof made of carbon-fibre composites (e.g. BMW M3 Coupé) produce a noticeably better power-to-weight ratio (kg per kW). Every kilo saved represents a measurable increase in agility and safety. You’ll feel it in every curve: evenly-distributed weight means increased driving pleasure.

Found here:
http://www.bmw.com/com/en/insights/t...tribution.html


Not being an automobile engineer or a marketing person, all I know is that once you have driven a BMW, you can't appreciate many other cars from the sheer driving pleasure point of view. Most evocative baselines are those that are true to the product (product experience in this case).

"Throw the car into corners" is not just something you will read, but actually, and progressively put into practice, with each passing parabolic curve. In fact you will start registering the curves and their characteristics because you were able to appreciate a well designed curve a lot more in a capable car.

You will notice that technology like 'Lane Departure Warning' has no use, because even while climbing up the hills, the car doesn't voluntarily leave the lane that you have chosen to be your own.

'Planted' is a word that comes naturally, without anyone seeding it in your mind.

There is a lot more confidence, a 'one-ness' with the vehicle that comes with the territory.

It is said that the best advertising campaigns and marketing spiel only help kill a bad product faster, because as more people experience the bad product, the faster the word of mouth spreads.

So 50:50 may not be a useless fact that has been hyped up. If it was, knowledgeable drivers would have soon realized that it's all bunkum since the advent of the E21s and the E30s.

It's not PMPO or PUF (to use other marketing and advertising spin from Music Players and Refrigerator categories).

Along with the suspension, tyres and wheels, aerodynamics and unsprung weight, rigidity of the frame, familiarity of the driver with the vehicle, weather, road condition and so on, the weight distribution is just one cog, a contributing factor to the whole driving dynamics that we have all come to appreciate in our favourite cars.

In a well distributed car, the driver will be a small addition and I assume will not make a huge difference to the handling characteristics of the vehicle. Because without a driver, the weight distribution and the rest of the factors are moot. Just a statistic to be discussed. Only when it is driven does it all come together and come alive.

And Sheer Driving Pleasure was never meant to be Sheer Driving Pleasure On The Way Back From The Supermarket :P

Though I suspect, even then it would be a great drive.
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Old 29th October 2013, 18:21   #19
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Look which other car has a battery placed for weight distribution :-)
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Old 29th October 2013, 20:31   #20
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Quote:
Originally Posted by Diesel_convert View Post
Attachment 1159815



Look which other car has a battery placed for weight distribution :-)


Could have been placed under the bonnet!!
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