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Bavarian Soundwerks' Mobile Electronics Forum
Have all your A/V and electronics questions answered here. Ipods, A/V, Radar Detectors Oh My!
Sponsored by Bavarian Soundwerks

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Old 09-22-2010, 10:55 AM   #1
jamex
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Join Date: Jun 2008
Location: Ontario, Canada
Posts: 354
My Ride: 2005 325Ci
Fuel economy lost from amps \ sub enclosure weight?

Just curious if anyone noticed a significant change in fuel economy from the extra weight in the trunk. I've been trying to isolate why mine isn't that great and I don't remember it changing much when I added the box & amp but I wasn't really paying attention to it much back then.

I'm averaging around 12L/100km or 19MPG with mostly city driving in a 325Ci.
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Old 09-22-2010, 11:20 AM   #2
Many330i
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Join Date: Dec 2006
Location: Little Elm, TX
Posts: 1,206
My Ride: 330i ZHP Silver
For city driving on a 2.5 motor, I say that's rather low - I get about 21mpg city on a 3.46 diff!

..and I don't understand why people add a box, sometimes dual, in that little trunk? In addition to lowering your hp/weight ratio, the bass doesn't sound half as good as an IB set-up, which I have!

That said, as a start, change your plugs if they have never been touched and your tires too if they are a little aged.
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Old 09-26-2010, 02:20 AM   #3
blaeznazn24
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Join Date: Apr 2010
Location: ca
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My Ride: m3
Quote:
Originally Posted by Many330i View Post
For city driving on a 2.5 motor, I say that's rather low - I get about 21mpg city on a 3.46 diff!

..and I don't understand why people add a box, sometimes dual, in that little trunk? In addition to lowering your hp/weight ratio, the bass doesn't sound half as good as an IB set-up, which I have!

That said, as a start, change your plugs if they have never been touched and your tires too if they are a little aged.
I beg to differ. I just had a 12'' put in the trunk in a built sealed enclosure and I'm pretty sure that it would beat down any free air set up in the same ballpark of audio parts used. That, along with 2 amps and a set of components, probably added a total weight of 25lbs to the car.
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Old 09-22-2010, 09:06 PM   #4
opey
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Join Date: Mar 2010
Location: long island
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My Ride: 04 M3 coupe
it shouldnt make much of a difference, its not like ur adding 300lbs. 50lbs or so isnt gonna change much
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