Difference between revisions of "Weight reduction"

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Latest revision as of 08:32, 9 July 2018

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As auto manufacturers focus on efficiency, one of the first things they will do to save fuel is reduce vehicle mass. EG. Nissan, Toyota, Ford and Mazda have publicly announced plans to shed weight from their lineups.

The EPA estimates that an extra 100 lbs can mean a 1-2% increase in fuel consumption, with smaller vehicles affected more than larger ones.

Weight reduction can be mild or wild, free or expensive, depending on how far you take it: from simply ensuring you don't carry around unneeded junk in the trunk; to replacing the spare tire with an aerosol can of tire sealant and a roadside assistance plan; to removing unused seats and interior panels; to spending money on lightweight rims/panels; to replacing glass with lexan; to driving only with the fuel tank partially full.

Don't forget that the driver's weight is a factor too! If you're looking for another reason to drop those extra pounds, think of your fuel economy.

Auto makers achieve larger benefits when reducing weight as they are able to reduce the engine size and give the same acceleration due to the lower car weight.

Removing what is not needed is the most cost effective way to remove weight. Upgrading to lighter parts can start out cheap but get expensive to where it costs between $10-$30 per pound. The problem is those dollars spent versus fuel saved cant really ever offer any kind of ROI.

Instructions for mod

Remove any of the following

- Anything being carried in the car that isn't required

- Carpeting / asthetic parts in the boot

- Carpeting / asthetic parts in the cabin

- Air conditioning parts, compressor, radiator

- Remove side mirrors

- Remove power steering pump

- Remove spare tyre, replace with wheel repair device

- Smaller lighter battery (Note: larger battery may be required for some hypermiling techniques or other mods)

- Remove of unused seats

- Remove radio speakers (only need 1 not 4 to hear the radio)

- Change glass to light weight lexan, windshields or car head lights


- Light weight wheels

- Swap your cast iron engine or cylinder heads for the aluminum version if possible

- Install light weight aluminum or high dollar carbon fiber drive shafts (RWD and 4x4s)

- Convert from a lead acid starting battery to a lithium (LiFePO4) unit that weighs 1 to 2 kg.

User experiences

Please enter your user name and any relevant data in the table

User data
User Name Car Make, Model, Year Cost of Mod Time to Perform Mod MPG Before Mod MPG After Mod MPG improvement guess Instruction Link
Saand Theoretical calculations
For 50kg weight reduction
each acceleration from 0 to 60km/h uses 1.27 ml or 0.00034 gal less fuel

Using this info, if you typically do this acceleration change (0 to 60kph) 30 times for every 100km distance that will use 38ml every 100km

If you are achieving 6 liters per 100km that gives a 0.636% efficiency advantage
For calculations see Theoretical influence of weight
Oil Pan 4 Large heavy vehicles around 6000lb What ever the cost per 100lb This should be your MPGs gain for highway driving 0.1MPG per 100lb http://ecomodder.com/forum/showthread.php/online-tool-shows-aerodynamic-drag-rolling-resistance-power-6341.html

Problems / Consequences of mod


Forum thread links

Nissan and Toyota's New Year's resolutions: LOSE WEIGHT

How I lightened up my Geo Metro by 70 lbs

External links

Comprehensive weight reduction list

Weight reduction effects on cars and trucks on the highway and in the city

External links for buying light weight materials

Premade Carbon fiber sheet, tubes, and other structures