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07-01-2007, 09:59 PM | #67 |
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I wrote that up in a hurry so now I reallize the logic is kinna crappy, but I hope the main point is clear, and that is to compare BMW quoted weights to other manufacturer's "curb" weight, we have to do some subtractions. :biggrin: (as danp has been saying, of course)
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07-01-2007, 10:03 PM | #68 | |
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330i (N52) has a magnesium block and the 335i (N54) has a all aluminum block. "Surprisingly the engine block of the N54B30 is similar to the older generation BMW M54B30 engine - all aluminum with cast iron cylinder liners. This is due to the fact that the newer N52 aluminum-magnesium engine block was not deemed as suitable for turbo-charging with the above-mentioned engineering goals. As a result, the N54B30 is physically heavier (195kg/429lbs) than the very light (161kg/354lbs) N52 engine. This also explains the fact that the engine block size is identical to the old M54B30 at 2979 ccm/181 in³ instead of the 2996 ccm/182 in³ of the new N52B30 3.0L engine. However, the advantage of the N54B30 engine is that compared to similar power output 225kW/390Nm V8 The 4.0L N62B40 it weighs 70kg less than the V8, which is massive at 265kg/583lbs - and the N54 has even higher low-end torque than this matching V8. For this reason BMW chose to develop bi-turbo inline straight-6 engines for the 3-series instead of using heavier V8 engines - the V8 engine would have made the gross vehicle too heavy. Only the new BMW M3 will have a V8 engine in the BMW 3-series." |
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07-01-2007, 10:10 PM | #69 | |
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07-01-2007, 10:15 PM | #70 | |
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EDIT: I'm confusing you with someone else from another forum. Never mind the question.
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07-01-2007, 10:23 PM | #71 | |
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Oh, boy...
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How much do we need to subtract from the EU weight or "unladen" weight to compare to curb weight? Also, which manufacturers use curb weight and which ones use unladen weight? Finally, do they do this to intentionally make it confusing? 1560 kg = 3439 lb 3439 - 165 = 3274 Gasoline is about 6 lb/gallon. What's the capacitiy? 15.5 gallons? 15.5 X 90% = 13.95. 14 X 6 = 84. 3274 - 84 = 3190. TDC, Is this how you got to 3186?
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07-01-2007, 10:33 PM | #72 | |
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07-01-2007, 11:11 PM | #73 | |
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Curb weight means the actual or the manufacturer's estimated weight of the vehicle in operational status with all standard equipment, and weight of fuel at nominal tank capacity, and the weight of optional equipment computed in accordance with §86.1832–01 So it does not include the driver or cargo, but it includes a full tank of gas. So subtract 165lbs for the driver and cargo, and add about 10 lbs to top up the gas. Disregarding other possible but probably smaller discrepancies, ~150lbs subtraction would be my first order approximation, AKA the spherical chicken method. |
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07-02-2007, 06:05 AM | #74 | |
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I got the same numbers you did, which I'm hoping is accurate... |
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07-02-2007, 05:08 PM | #75 |
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Can someone explain me this
A 630i has a EU weight off 1575 kg length 482,5 cm wide 185,5 cm 135i coupe eu weight of 1560 kg Length 436 cm Wide 175 cm |
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07-02-2007, 07:34 PM | #78 |
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Okay fellas. The latest InsideLine 335i vs G37 article put the curb weight of a 335i coupe 6MT at 3525. It would be say the 1 is 3300ish.
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07-02-2007, 10:11 PM | #79 | |
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1560 - 55 = 1505 kg (3318 lb), Then subtract the 165 lb and we're at 3153... right where we want to be. OK, OK. Maybe this explanation is a bit of a stretch. But not as much as saying the 630 is only 33 lb heavier than the 135. I mean, come on... BMW is having a little fun with us on the weight here. They did it with the spy photos, why wouldn't they do the same thing with the specs? Really. I think Advevo's been onto this for some time, but these numbers are too ridiculous to ignore.
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07-02-2007, 11:08 PM | #80 | |
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I think we need to face the reality that the twin turbo engine, with (presumably) all the upgraded driveline components to handle that torque, weighs in significantly more than a N52 or N53. Also, the 1 is mechanically very similar to the 3, and while it is smaller, it does not employ many of the weight saving techniques that are in the 3 for cost reasons. Again, I think we need to subtract about 150lbs from the unladen figures to make fair comparisons to competitors that use curb weight. (On this note I think we should be careful with magazines' using the term "curb weight" on BMWs. They seem to quote the unladen weight from the spec sheet and just call it curb weight, in case we are not confused enough.) After the subtraction, the 1 still turns out to be on the lighter side. What I am more concerned about now is the advantage of the 1 over the 3. |
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07-02-2007, 11:27 PM | #81 |
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In looking at the abreviated specs in the 6/30 BMWNA press release I wonder if the 6-pot front brakes are heavier than a 130i and the new-gen, low-friction diff may not be low-weight (although it needs less fluid). Just trying to piece together this puzzle.
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07-02-2007, 11:43 PM | #82 | |
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Originally Posted by chuck92103Who'd a thunk it? I just don't want to believe it.:mad: Say it ain't so so.:frown: [I didn't believe it, so I looked it up. Shucks!] Alright, what if I pass on the moonroof, power seats, premium stereo and nav, then replace the OE wheels and RFT's with forged wheels and non-RFT's... and lose 15 lbs? What other heavy crap could could I jettison? How much does an '06 Lotus Elise cost now? (Did I say that out loud?)
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07-03-2007, 09:44 AM | #83 |
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No doubt the Elise is the way to go if "smaller, lighter" is the guiding criteria. However, it is just not practical enough nor can I get my old, fat ass in and out of it without major issues. I also would not drive an Elise cross country. but man, could I dominate A-Stock Solo in my SCCA region!
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07-03-2007, 10:02 AM | #84 | |
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If it's enough fun, I can justify the rest. Please, BMW, make it too fun to pass up. I know you can do it.
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