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General E46 Forum
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Old 01-22-2013, 08:22 PM   #21
Grande D
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Originally Posted by dreyo27 View Post
I went to the track, 325ci stickshift, ran the 1/4 mile at 15.6

took out the spare, rear seats and ran a 14.9
You didn't remove nearly enough weight to make your car seven tenths of a second faster.

Was your 60 foot the same each time?
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Old 01-22-2013, 09:15 PM   #22
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^i agree, you wanted it to go faster, so you made it happen (i.e. better launch, shifts, etc.)
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Old 01-22-2013, 09:26 PM   #23
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ONCE I GET HOME I WILL POST THEM.
this happend on two seperate occations. i came once had my fun ran a 15.6
next week striped the inside lightly and ran a 14.9
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Old 01-22-2013, 09:44 PM   #24
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What are you getting so worked up about? Posting them won't make any difference. The parts you removed aren't made out of lead. There is an abundance of quarter mile times that debunk what you are trying to say in terms of power to weight ratio. I'm simply telling you there is too much variance to attribute your times strictly to those weight reductions. I'm sorry. A good example would be an automatic trans in these cars. Since all you have to do is put your foot down and the quarter mile times will be fractions different. This is due to basically no wheel spin off the line and computer controlled shifts (SD mode). If these times changed significantly due to weight reductions.... then I'd be impressed. Somebody may chime in here and prove me wrong with the same results as you, but I've been to the 1/4 mile track quite a bit and I just haven't seen times change that much simply due to a spare and rear seat removal. I'm just saying it's unlikely.
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Old 01-22-2013, 09:50 PM   #25
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Old 01-22-2013, 09:58 PM   #26
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Generally speaking at the track they say that you can take off .1 second per every 100 lbs shed on 12-15 second et cars.

The BMW listed curb weight of a 330i/330ci manual is 3285 lbs. The stated US HPis 215 (non-m, non-zhp). that's a power to weight ratio of 15.28 lbs (roughly) per horsepower. M3's are 10.25 lbs per HP. Every pound helps and it's cheaper to loose weight (to a point and generally speaking) than adding horsepower to our NA engines.
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Old 01-22-2013, 10:05 PM   #27
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ONCE I GET HOME I WILL POST THEM.
this happend on two seperate occations. i came once had my fun ran a 15.6
next week striped the inside lightly and ran a 14.9
So you're on the right of the slip you posted? I'm not disputing your numbers. I'm sure a tenth or two was due to weight. But in that week you probably also got the hang of the strip/car a little more too.
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Old 01-22-2013, 10:10 PM   #28
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^this^ is exactly what I mean. Do you not think if you were to put the weight back in the same night you got the slip you just posted you couldn't have improved your original 15.6 time? I'm honestly not trying to hate (if anybodys car is slow... it's mine), just trying to be realistic. My car ran 16.7s the first night on the track with 16" style 45s. After pulling the spare out and replacing vanos seals it ran 16.5s, but that was on my 18" rims, so not really a true pre/post comparison. I haven't run it after installing the headers, but yea... it's an obese woman.
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Old 01-22-2013, 10:13 PM   #29
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What about body weight?
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Old 01-22-2013, 10:16 PM   #30
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I found dis'

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Acoustics have also undergone change 20 kgs of insulation material has been removed to increase engine sound.
Read more at http://www.supercars.net/cars/180.ht...UaZhT4cfifZ.99
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Old 01-23-2013, 02:29 AM   #31
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The general, though not real scientific, rule is 1 KG lighter is roughly equivalent to adding 0.3 horse power in terms of the quarter mile anyway.

So in order to add the equivalent of 9 horsepower you would need to remove 30KG of weight.

Just as a side note one other good way of lightening your car is rolling around with not much in the tank. 1 liter of gas weighs 0.7 KG.
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Old 01-24-2013, 03:56 AM   #32
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^this^ is exactly what I mean. Do you not think if you were to put the weight back in the same night you got the slip you just posted you couldn't have improved your original 15.6 time? I'm honestly not trying to hate (if anybodys car is slow... it's mine), just trying to be realistic. My car ran 16.7s the first night on the track with 16" style 45s. After pulling the spare out and replacing vanos seals it ran 16.5s, but that was on my 18" rims, so not really a true pre/post comparison. I haven't run it after installing the headers, but yea... it's an obese woman.
I honestly don't think i could, I consistently ran 15.6 in the end, and did about 20 runs that day.....

same thing the next week, about 20 runs, and once again consistently 15.0-14.9
(except the time i didnt turn off the DSC)
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Old 01-24-2013, 07:57 AM   #33
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Originally Posted by dreyo27
I honestly don't think i could, I consistently ran 15.6 in the end, and did about 20 runs that day.....

same thing the next week, about 20 runs, and once again consistently 15.0-14.9
(except the time i didnt turn off the DSC)
I understand that you got a consistent time for both days, but I mean the same day. For example, bring your car to the track "weighted" and run it a couple times. Then do the "weight reduction" there since it is very simple to pull these items out. Put the items in a friend's car. Run the car again a couple times. Then maybe for good measure put all the stuff back in and run it a couple times before you leave for the day. Since you seem to do 20 runs when you are there it shouldn't be too hard to do this. Doing it all on the same day takes out, or atleast minimizes, many different factors.
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Old 01-24-2013, 06:56 PM   #34
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Might as well take the driver seats out and sit on cardboard boxes instead
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Old 01-24-2013, 07:01 PM   #35
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Might as well take the driver seats out and sit on cardboard boxes instead
With this trend he'll be in the 12s just with weight reduction
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Old 01-24-2013, 07:04 PM   #36
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With this trend he'll be in the 12s just with weight reduction
Lol..before he even mods anything
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