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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 07-01-2008, 12:39 PM   #1
leej323
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Shaving weight/Fuel savings

This might seem like a strange post, but with $5 gas, I'm sure even us track folk have begun to think about fuel savings.

To all who have shaved off weight and still drive your car on the street:

1) Did you notice better fuel economy?
2) What part(s) do you think contributed most to shaving off unnecessary weight?
3) If you were to recommend parts to someone interested in shaving weight while keeping his/her car streetable, what would you recommend?

Please don't say "remove the spare tire".
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Old 07-01-2008, 01:21 PM   #2
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Most noticeable weight change is wheel/tire, brakes, backseat, exhaust.
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Old 07-01-2008, 03:38 PM   #3
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Has anyone documented increases in mpg?
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Old 07-01-2008, 05:34 PM   #4
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I tried to...but as my car lost more and more weight, the fuel system was also getting more and more effed up, so my mpg is actually worse than when I started
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Old 07-01-2008, 07:08 PM   #5
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Quote:
Originally Posted by shady3one3 View Post
I tried to...but as my car lost more and more weight, the fuel system was also getting more and more effed up, so my mpg is actually worse than when I started
That's really strange... could the fuel system problem be related to a heavy foot?
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Old 07-01-2008, 08:08 PM   #6
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In racing, it's amazing how we calculate fuel mileage and try to find any way to make it better. Here's what I find interesting. A 2200lb Mini Cooper can go just as long as my 2875lb BMW. It all comes down to that Mini needs a bunch of help to keep up with the 330 and it suffers in the fuel mileage area. What really makes a car give better fuel mileage, it just slowing down. In the dry, I get about 75 minutes on a tank of fuel. In the wet, expect around 130 minutes. Also, when you have a fast driver, he gets worse fuel mileage than the slow gentleman driver. It just comes down to how much you have your foot on the gas.
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Old 07-01-2008, 08:12 PM   #7
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In racing, it's amazing how we calculate fuel mileage and try to find any way to make it better. Here's what I find interesting. A 2200lb Mini Cooper can go just as long as my 2875lb BMW. It all comes down to that Mini needs a bunch of help to keep up with the 330 and it suffers in the fuel mileage area. What really makes a car give better fuel mileage, it just slowing down. In the dry, I get about 75 minutes on a tank of fuel. In the wet, expect around 130 minutes. Also, when you have a fast driver, he gets worse fuel mileage than the slow gentleman driver. It just comes down to how much you have your foot on the gas.
Even in real life driving, that's pretty much the experience! What are you harping about?
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Old 07-01-2008, 08:25 PM   #8
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Quote:
Originally Posted by leej323 View Post
That's really strange... could the fuel system problem be related to a heavy foot?
No, its related to needing new/bigger injectors
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Old 07-01-2008, 10:44 PM   #9
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Quote:
Originally Posted by mrshelley View Post
What really makes a car give better fuel mileage, it just slowing down. In the dry, I get about 75 minutes on a tank of fuel. In the wet, expect around 130 minutes. Also, when you have a fast driver, he gets worse fuel mileage than the slow gentleman driver. It just comes down to how much you have your foot on the gas.
I agree that slowing down nets better mileage. I already drive slower than my parents on the streets. Most people shave weight in order to go faster. I'm looking to shave weight and drive the same pace and hopefully net better mileage.

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No, its related to needing new/bigger injectors
Haha, was being sarcastic about the heavy foot.
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Old 07-02-2008, 01:26 PM   #10
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I found the lighter my car got, the more fuel I used.

What gives?
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Old 07-02-2008, 04:31 PM   #11
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I found the lighter my car got, the more fuel I used.

What gives?
It's logical because as you lighten the load, your car will essentially become more responsive, allowing you to drive it more quickly and put more of the engine's power to use for a longer period of time. Using more of the engine for a longer period of time means you're going to consume more fuel.

The same trend is apparent in MrShelley's personal experience with fuel consumption in wet/dry racing. In dry conditions you have more traction and can spend more time accelerating (using the engine and burning fuel). In wet conditions you have less traction and need to be more cautious with the gas. End result is that you drive slower in the rain and use less fuel.
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Old 07-02-2008, 04:45 PM   #12
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CSL trunk, REMOVE YOUR SPARE, WTF.
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Old 07-02-2008, 04:52 PM   #13
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free mods:
-empty windshield washing fluid
-remove spare tire
-remove trunk lining/carpet
-remove back seat if unneeded

not so free mods:
-change to 17" lightweight wheels (ex: OZ ultraleggeras)
-lightweight battery
-install CF replacement parts (ex: hood, trunk, roof)
-lightweight racing seats
-replace xenon headlights with halogen


These should probably be the easiest weight removal mods available, and probably the most inexpensive too...
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Old 07-02-2008, 05:01 PM   #14
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I love it when people don't read the first post.
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Old 07-02-2008, 05:06 PM   #15
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What sort of MPG do you get right now?

Shady had some good suggestions. Wheels, tires, brakes, exhaust system can shave quite a bit off and your car will still be very streetable.
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Old 07-02-2008, 05:07 PM   #16
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Originally Posted by leej323 View Post
I love it when people don't read the first post.
Dude, what do you expect to hear? Every car, every setup, and most importantly: every driving style influences your MPG.
So even if people tell you the what weight saving mods they have and how much they saved/didn't save with it, it doesn't have to apply to you, or anyone else.
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Old 07-02-2008, 05:10 PM   #17
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Repost I kid I kid

Did this a while back...check it out.

http://forum.e46fanatics.com/showthr...shaving+weight

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Old 07-02-2008, 05:20 PM   #18
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Originally Posted by aggieE46 View Post
What sort of MPG do you get right now?

Shady had some good suggestions. Wheels, tires, brakes, exhaust system can shave quite a bit off and your car will still be very streetable.
This is hopefully going to turn into a long-term experiment. Currently building a baseline.

Quote:
Originally Posted by Ferm3 View Post
Repost I kid I kid

Did this a while back...check it out.

http://forum.e46fanatics.com/showthr...shaving+weight

Thanks for the lead.
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Old 07-02-2008, 05:21 PM   #19
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This is hopefully going to turn into a long-term experiment. Currently building a baseline.


Thanks for the lead.
Sure....really good info on their for shaving weight.

~Ron
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Old 07-03-2008, 02:10 PM   #20
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Stock e46 coupe complete doors = 73 Lbs each

Carbon fiber door shells with lexan windows = 19lbs each

I have no idea how I found that out.

I'm not too far off from posting a very comprehensive weight listing for the E46 coupe. It's like a hobby within a hobby.
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