The bumpers on a car decrease MPG

  • Thread starter Low-Q
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  • #1
Low-Q
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Main Question or Discussion Point

Hi,

I have thought about how the bumpers affects the performance of the available power in a car engine. The bumper applies friction to the suspension so the car doesn't jump off a bumpy road. However, that friction will be a sort of energy loss. The questions is: How much energy loss is it at a given car weight and suspension travel pr. time? By how much will that decrease MPG?

Vidar
 

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  • #2
CWatters
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Oh you mean the shock absorbers...

http://blogs.discovery.com/files/energy-harvesting-shock-absorber-june-2011.pdf

Energy Harvesting Shock Absorbers

snip

We estimated that for a middle-size vehicle, 100W, 400W, and 1600W of average power is available for harvesting from the regenerative shock absorbers while driving on Class B (good), C (average), and D (poor) highways at 60 mph.

snip

This represents a potential of 1-4% fuel efficiency increase in conventional cars and up to 8% for hybrid vehicle.
 
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I think they absorb energy which would be lost anyway - just in other parts of the car. They can even reduce losses, if they keep the whole car from bumping around.
If that energy can be extracted: Even better.
 

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