09-15-2014, 09:53 AM
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#41 (permalink)
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EcoModding Lurker
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Quote:
Originally Posted by mcrews
to add to Mech, the spinning weight is 3-4 times more than static weight. SO 5lb at each wheel is 15-20lb.
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If we are talking about acceleration, the maximum ratio is 2:1. That happens only when all the added/reduced mass is concentrated at the radius of the wheel. In reality that is not the case and the ratio is less than 2:1. I'd estimate, that 5 lb at wheel is comparable to 7-9 lbs of non-rotating mass.
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09-15-2014, 03:35 PM
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#42 (permalink)
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5 pin sensor
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I'm surprised no one has listed light weight lug nuts as a modify action. 4 of them weighing 3.5 lbs a set on 4 wheels can definitely add up. You could also add deleting rear brakes to reduce the rotational mass, that's about 15lbs a wheel
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09-15-2014, 03:48 PM
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#43 (permalink)
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Master EcoModder
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Rotational mass is experienced at the edge of the radius, nut the center, so lug nut weight is not consequential.
And I can not imagine removing the rear brake........
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09-15-2014, 04:29 PM
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#44 (permalink)
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Got MPG?
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Quote:
Originally Posted by Chrysler kid
... You could also add deleting rear brakes to reduce the rotational mass, that's about 15lbs a wheel
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You aren't seriously suggesting that someone should delete their rear brakes on a road worthy automobile...are you? Not legal or safe.
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09-15-2014, 05:00 PM
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#45 (permalink)
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Master EcoModder
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Nah, ditch the brakes. All they do is slow you down.
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09-15-2014, 05:11 PM
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#46 (permalink)
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Master EcoWalker
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Who needs a parking brake when you can shoulder it against a rock anyway? :P
Lug nuts don't do much, but if you change the hub material into something space age your wallet will be so much lighter you'd feel it at the pump.
Seriously, has anybody ever looked into the weight of the hub etc?
Why bolt that carbomagnesium rim on a pig iron hub?
Any other way to reduce weight on the hubs, or am I, err.... boring?
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Last edited by RedDevil; 09-15-2014 at 05:18 PM..
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09-15-2014, 05:50 PM
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#47 (permalink)
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Not Doug
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Quote:
Originally Posted by RedDevil
Who needs a parking brake when you can shoulder it against a rock anyway? :P
Lug nuts don't do much, but if you change the hub material into something space age your wallet will be so much lighter you'd feel it at the pump.
Seriously, has anybody ever looked into the weight of the hub etc?
Why bolt that carbomagnesium rim on a pig iron hub?
Any other way to reduce weight on the hubs, or am I, err.... boring?
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Actually, I chuckled at that.
Rocks are so prehistoric! Use other cars to stop yours!
This article is about $15,000 carbon-fiber rims for a Porsche 911, 19x8.5 and 19x12" rims, that are over ten pounds lighter than the stock wheels. One source estimated that would increase fuel efficiency by four percent:
Carbon-Fiber Wheels: A Costly Upgrade, But Better Performance? |
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09-15-2014, 05:53 PM
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#48 (permalink)
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EcoModding Apprentice
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How do alloy and aluminum wheels fair in terms of fuel economy?
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09-15-2014, 06:13 PM
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#49 (permalink)
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Master EcoModder
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Last edited by Cobb; 09-30-2014 at 09:36 PM..
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09-15-2014, 06:37 PM
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#50 (permalink)
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Not Doug
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Quote:
Originally Posted by SilverCrown9701
How do alloy and aluminum wheels fair in terms of fuel economy?
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Honda put lightweight alloy wheels on the VX and HX and lightweight aerodynamic wheels on the Insight and Civic hybrid, but many users on here put smooth wheel covers on steel wheels instead of trying to get lightweight ones--general consensus seems to be that aerodynamics make much more of a difference than weight. People say not to purchase new rims expecting to save money.
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