05-07-2012, 12:53 PM | #45 |
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Simple test
Simple way to test this theory and figure out the story once and for all. Find 2 X3's with the same engine/transmission combo, one brand new and one with more than 10000km. Put them both on a dyno and compare the results.
Bonus points if you can borrow a new one from a dealership and run the engine hard on one they still own. |
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05-07-2012, 01:07 PM | #46 |
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Something is happening around 10k km. The engine is starting to wear into itself. It is loosening up ever so slightly. Not only the engine but the drivetrain. Bearings start to get broken in and loosen up along iwth all other moving parts.
This is why you start to see slightly incresed MPG, slightly better performance etc... |
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05-07-2012, 01:24 PM | #47 | |
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05-07-2012, 01:46 PM | #48 |
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One other thing that I would like to mention is the top speed (software) limit on all new powerful BMWs at 250km/h or 155mph.... Isn't this also a violation of customers rights in the US?
Just asking...... ;-) |
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05-07-2012, 02:16 PM | #49 |
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Friction reduction accounts for the change as the car accumulates more miles/km's. This is pretty well understood; as the engine beds in it will accelerate more freely and use less fuel. That's a gradual process that's almost imperceptible, until some event makes you take notice. It's about perception not reality. As you hit the gas pedal on the on ramp to get out ahead of a truck you notice the difference. If you did exactly the same thing every day under exactly the same conditions you wouldn't notice. It's simply your mind playing tricks, not the tricks of an electronics engineer.
When we see written proof from BMW HQ that they restrict the performance of the vehicle below a certain mileage then i will believe. Until then it's simply good old mechanical friction imperceptibly changing and one event that changed your perception. |
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05-07-2012, 03:36 PM | #50 |
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Hmm , the only one event that changed my perception and involved good old mechanical friction occurred with my first girlfriend many years ago. :-)
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05-07-2012, 03:38 PM | #51 | |
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The break in period is only a suggestion. Don't take it too seriously, but don't flog your car right away. With so many moving parts, it's smart to give them some time to wear into each other. |
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05-07-2012, 04:08 PM | #52 |
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Porsche can run a very simple DME test of rev thresholds. This covers how many times over the life of the car you buzzed the redline, how long over the red line you were, and how far above the redline you were.
From this analysis they will void your warranty. They will also use this data to deny long term warranties and Porsche Approved status. A friend bought a GT3 and didn't check for over-revs. He asked for the car to be evaluated for long term cover and was denied as the car had a number of serious over-revs. Essentially the previous owner (not a very good driver) had buzzed the redline on a number of occasions that showed they were done on the track. Moral of the tale. If you exceed even advice offered in the manual the manufacturer can deny you warranty. |
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05-07-2012, 04:17 PM | #53 | |
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Only with manual transmission ..... Difficult with automatic as the electronics will shift at high revs..... And then there was this software limit at 155mph/250kmh.... |
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