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Old 08-27-2008, 10:25 PM   #1
refemall
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Removing Subwoofers = Better Mileage?

I'm currently driving a 2000 Focus SE, though I'm sure this would really relate to any car.

I have two 10 inch RF P1's enclosed in a large box in my trunk, which I currently use for my sound system. My question is, if I replaced this with a single subwoofer, or removed them altogether (hopefully to lighten the load), will my car attain better gas mileage?

Being a University student, and with gas prices going up, I'm trying to save every dollar I can. I figure two things... my mileage should be a little better, and the money I get from selling the subs can go towards more gas.

What do you guys think?


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Old 08-27-2008, 10:32 PM   #2
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removing the subwoofer wont be that significant of a mpg gain. i had 2 10"s in a large box as well and when i removed them i didnt notice any mpg gains but i did feel like i accelerated a bit quicker, but mostly it was in my head. the system weighs around 50lbs, its not gonna make a difference that will save you any money. keep it and bump around campus
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Old 08-27-2008, 10:32 PM   #3
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Double post. whoops
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Old 08-27-2008, 10:33 PM   #4
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[QUOTE=Master-Baits;2312601]Yes. Theoretically if you lower the mass of an object it will take less energy to do the work to move it. So any weight you can remove, i.e. your sub, spare tire and jack, rear seat, or anything like that will lighten your load requiring less fuel consumption. The question is...how much? How much do you think your subs weigh? I didn't see a difference at all in highway driving at 75 mph with cruise control... So I think the difference will be basically unnoticeable or insignificant i think the listening pleasure outweighs the loss of mileage. Heck, if you just want the cash sell one?
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Old 08-27-2008, 10:47 PM   #5
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Don't waste ur time, not worth it for gas mileage, I've dropped 250 lbs and I barely know a difference!!
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Old 08-27-2008, 10:57 PM   #6
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I took all the extra weight out of my car (sub, amps, spare etc) didn't drive any different and saw maybe 1mpg more. Not worth it.
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Old 08-27-2008, 11:11 PM   #7
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But you'll be using the alternator less because you're not driving the woofers...............

Less alternator usage, less drag on engine, better mileage.
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Old 08-27-2008, 11:37 PM   #8
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the alternator is always spinning, it doesnt have a "clutch" to turn it on and off, like an ac compressor does, it will always produce the same amount of load on the engine regardless of how much power it is producing
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Old 08-28-2008, 12:02 AM   #9
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Quote:
Originally Posted by focusman6297 View Post
the alternator is always spinning, it doesnt have a "clutch" to turn it on and off, like an ac compressor does, it will always produce the same amount of load on the engine regardless of how much power it is producing

Nope, the load on the engine increases with amperage output of the alternator.

Get in an old car that doesn't have the ECU control idle speed. When you turn the lights and fan on, the idle speed decreases because the alternator needs to put out more amps, and thus more load on the engine decreasing idle speed.
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Old 08-28-2008, 12:06 AM   #10
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that's not true for newer cars, the alternator is the same, it's only a problem when your alternator can't keep up and the battery dies. (i thought so at least, but wouldn't be the first time i was wrong)
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