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06-10-2007, 03:21 PM | #23 |
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The only way the engine can generate electric power to charge the battery is via the alternator. Is that what you are suggesting? If it is, there is nothing special about that. All IC engine cars have alternators that do exactly that. Unless, they have done something funny with the alternator so that it engages more during braking or something?
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06-10-2007, 03:43 PM | #24 | |
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As far as the MPG discussion goes. BER saves about 0,3 liter per 100km. Best regards, south EDIT: See how the M5 manages that point: The electronic throttle valve control is based on a so-called power and torque structure which uses a potentiometer on the accelerator pedal to measure the driver’s wish for power and performance and converts this to the desired function. The power and torque manager adjusts this request function by adding the power signals from the auxiliary engine units, such as the conditioning compressor or the generator. Based on that you can see the difference: Let's say you're halfway on the pedal (50%). On the M5 the engine management adds the demand of the alternator which results in e.g. 55%. On the M3 it stays at 50% and the alternator is uncoupled. Based on that difference there is a slightly better mileage. Last edited by southlight; 06-10-2007 at 04:08 PM.. |
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06-10-2007, 04:37 PM | #25 |
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Then it's not the same type "regenerative" system that hybirds use, as I suspected. The forward momentum of the car is being turned into energy without the use of fuel soley because the wheels are turning the engine and therefore the alternator during deceleration . It's somewhat of a misnomer because braking really has nothing to do with it.
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06-11-2007, 03:38 AM | #26 | |
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Best regards, south |
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06-11-2007, 03:53 AM | #27 | |
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06-11-2007, 05:41 AM | #28 | |
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A properly implemented system would to some extent improve fuel economy and power as well as conserving brake pads. Someone would need to do the calculation to determine whether these effects would be measurable or it is just marketing guff |
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06-11-2007, 01:58 PM | #29 | |
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06-11-2007, 04:09 PM | #30 |
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ahhh snap i just caught this look down in the the little brown brief description on the right.. its says
22.8mpg! LOOKS LIKE WE ARE WORRYING FOR NOTHING..HAHA |
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06-11-2007, 05:42 PM | #31 | |
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People keep getting that confused.
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06-11-2007, 06:26 PM | #32 | |
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1) As Epacy says, testing was not done to US EPA standards. 2) Gallons may be in imperial measure (UK gallon = 1.2 US gallons), since this was in a UK mag.
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06-11-2007, 07:55 PM | #34 |
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Number-crunching wise......yes. I don't think that method is reliable either.
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06-11-2007, 09:10 PM | #35 |
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Garage List 2009 e92 M3 DCT CF ... [10.00]
2015 S-Works Roubaix [0.00] 2013 Trek Madone 5.9 [9.50] 2012 Scott - CR1-Pro [10.00] 2008 e92 M3 6MT (Up ... [10.00] 2002 e46 M3 Cabriol ... [7.00] 2006 e90-325i (DD) [7.00] 2002 e39 M5 (retired) [9.50] |
I had a e39 V8 M5, never have I seen 22.8mpg.
.... thats what I get now with a I6-e90/325
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