01-25-2013, 05:35 PM | #353 | |
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Firstly, I think partly it depends on the variance distribution of those engines, which nobody outside of BMW will know. That is to with with the inherent tuneability of those engines. Secondly, there can also be sensors which are inaccessible to piggy-back modules, in which case the DME will receive unadultered data for those parameters. I don't know whether any tuner have managed to obtain a low compression U0 for development purpose, as the first thing they can try is to fit a O0 DME & then bench the engine. |
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01-25-2013, 10:17 PM | #354 |
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So the 320 and 328 are (almost) identical and yet there is a sizeable price difference. 2 possible conclusions from there:
* The 328i is insanely profitable * The 320i will be at a loss or no benefit for BMW, and is just intended to fill the market and prevent other brands from gaining followers I suspect the second one. Also, the 3 bangers is expected to deliver the same 180hp, but think of the sale pitch on the US market. You would have had a 300hp i6, 240hp i4, and introduce a new 180hp i3. People would have been trashtalking about brand dilution and ridiculous undermotorenwerke for ages, damaging the new engine sales and possibly the brand image. Now look at the sales pitch when introducing the 180hp i3, when the 180hp i4 exists in the lineup already... Same hp, gets 30% mpg increase, that's like you can actually make a point that the i3 is superior technology, instead of being watered down crapola. |
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01-25-2013, 10:27 PM | #355 | |||
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The dyno chart u attached is for a low compression U0. If no binning has been done then by running at O0's level of boost (plus other parameters) it should give at least the full 245ps/350Nm, if not more (as dyno readings from a number of 28i in stock form proves time & again). Remember wht the BMW China tech staff said regarding swapping pistons & DME mapping on a high compression U0? From this dyno I wouldn't say BMW failed cos a.) this is from a low compression U0 & b.) it did not manage to produce at least the O0 baseline output. Most tuners quote around 220ps from piggy-backs w/o optimisation to individual cars, so 230ps is the most u can get just by using a piggy-back. Don't forget that the difference in margin is big for most markets where the U0 is popular when compared to the O0 (e.g. the pre-tax price delta in Japan for a X1 20i is around USD10,000 when compared to the X1 2.8i, in China the delta is USD14,600), u can see the cost/benefit is skewed hugely towards using measures to preventing this opportunity cost, however small the number of ppl willing to do such tunes. The cheaper & the more convenient the tune is, the more the ppl are willing to buy them. Piggy-backs are inexpensive & installation is easy. Quote:
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JIT for BMW is to minimise production cost & maximise quality, it's not for satisfying customer orders so they can get their cars double quick. They try to dictate customer demand rather than the other way round (different to volume makers, they make u choose them rather than they choosing u). That's why there're all these dealer & importer allocations. As these allocations are fully committed by the respective importers/dealers, they have advanced info right at the beginning of the year regarding wht to make & when to make. The only variable is the colour combo & equipment spec. That's the reason why, for example, they have incentive programmes for various models during various times. That is to create demand for hitting allocation targets. |
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02-03-2013, 03:44 PM | #357 |
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Clarence, I hate to burst your bubble but the 320i and 328i share the same piston, at least in the USA. The article sites info source by BMW NA.
so basically in summary the only thing limiting the 320i from putting out 300hp is the ecu |
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02-03-2013, 04:02 PM | #358 |
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^I didnt see any facts in that post, only lots of speculation. It seems to me that if the 320i and 328i had the same engine that the European tuners like Schnitzer, Hartge, G-Power, etc would have already found this.
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02-03-2013, 05:09 PM | #359 | |
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also u just skimmed through the article and u concluded it'd speculation when all the facts are there the writer stated everything clearly and mentioned his source in the comments his source is BMW north America |
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02-03-2013, 06:37 PM | #360 | |
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02-04-2013, 08:55 AM | #361 | |
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However, if you look at the Spec of 320i xDrive, you'll be surprised to find that the compression ratio of 320i xDrive is 11:1. So, could this be some kind of error, or BMW NA is taking a completely different approach from those in rest of the world? |
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02-04-2013, 09:38 AM | #362 |
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I bet they will sell a ton of these things. I had one as a loaner (been available up here for a while) and it was pretty good. 8 speed tranny is always on the move which makes it great (quick but a little annoying) in the city. Great little car.
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