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-   -   Fuel economy lost from amps \ sub enclosure weight? (http://forum.e46fanatics.com/showthread.php?t=793390)

jamex 09-22-2010 09:55 AM

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.

Many330i 09-22-2010 10:20 AM

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.

opey 09-22-2010 08:06 PM

it shouldnt make much of a difference, its not like ur adding 300lbs. 50lbs or so isnt gonna change much

blaeznazn24 09-26-2010 01:20 AM

Quote:

Originally Posted by Many330i (Post 12264640)
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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