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08-24-2008, 11:18 AM | #24 |
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Conforming to BMW’s Efficient Dynamics, these vehicles will include the following: • Brake Energy Regeneration - The system increases the demand on the charging system under braking thus charging the battery when the vehicle is reducing speed which results in saving fuel. BER requires an intelligent battery sensor (IBS) on the negative terminal of the car battery and a communication interface on the alternator. In addition, vehicles with IGR use only AGM gel batteries that can withstand the large number of charge cycles. When servicing it is important to ensure that only that type of battery is fitted.
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08-24-2008, 01:42 PM | #26 | |
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Intelligent Alternator Control (IGR) Intelligent Alternator Control (IGR) is also referred to as Brake Energy Regeneration (BER) in the customer documentation. This new function of IGR, utilizes the previously unused kinetic energy produced in overrun or deceleration mode to drive the alternator. IGR generates the necessary electrical current demanded by the vehicle’s electrical system without having to use engine power, which translates to better fuel economy and less tail pipe emissions overall. In contrast to conventional power management systems, the battery must not be fully charged at all times but rather should maintain a charge level that is within certain limits. A fully charged battery cannot accept any more charge. When the driver lifts off the accelerator pedal and steps on the brake the system uses that otherwise wasted kinetic energy generated as the vehicle is stopped to replenish the battery state of charge. Ultimately as the driver applies the gas pedal the charging system is disabled to render the engines maximum power. IGR requires an intelligent battery sensor (IBS) on the negative terminal of the car battery and a communication interface on the alternator. In addition, vehicles with IGR use only AGM gel batteries that can withstand the large number of charge cycles. When servicing it is important to ensure that only that type of battery is fitted.
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08-24-2008, 02:05 PM | #27 |
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Battery chemistry (AGM vs. normal wet cell) isn't the only factor affecting battery life. IME the primary factor is the discharge rate vs. battery capacity: if you draw out a higher percentage of the battery's total capacity with each use, you kill it faster. IOW for a given car's aux DC load and a given driving style, the discharge rate will be consuming a higher percentage of the total capacity available in a smaller battery vs. a larger one. Now add in the fact that any battery's total available capacity inevitably drops incrementally over time, and you can see the second problem with a smaller battery: smaller capacity to begin with, diminished further by use over time, guarantees a deeper & deeper discharge for a given car and driving style.
The whole equation is a downward spiral: go smaller, kill it sooner, replace it more often and - if you live in a seasonal climate - expect to be surprised more often by a dead start. Jack |
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08-24-2008, 09:41 PM | #29 | |
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Banner batteries makes an AGM battery that has the green sight glass that I thought only came on standard batteries. http://www.bannerbatterien.com/banne...atterienGB.pdf Here's the info saying Banner supplies batteries to BMW, although I don't see a white battery on their website. http://www.bannerbatterien.com/banne...GB29052007.pdf
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08-25-2008, 02:18 AM | #30 |
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I know a couple people that have done the racing battery swap and made custom mounts. One of which did it in a M coupe. The only problem they came across was if they didn't drive the car for a long period, they would have to jump start the car. Not driving it for a week would easily drain the battery.
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08-27-2008, 05:27 PM | #31 | |
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but I may be wrong also I'm assuming regen brakes only work if you leave the car in gear while you brake, I never do that, maybe I should re learn how I slow down does anyone know if regen brakes will lower the life of the serpentine belt?
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08-28-2008, 02:56 PM | #32 | |
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Of course, you have to press the clutch in while braking hard but it would help to engine brake as much as possible, such as when you're on the highway and want to gradually reduce your speed. When I'm coming up to a light I try to let off the gas and let the engine slow the car, then hit the brakes when the rpms get too low or I'm coming up behind another car, etc. I wouldn't worry about the serpentine belt. BTW, I think "regen brakes" gives people the wrong idea. THe brakes aren't regenerating anything besides heat. We should be calling it "regenerative engine braking."
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08-28-2008, 03:03 PM | #33 |
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I will say I got a warning message that said something like, "battery charging error." The pc925 battery was charged when I installed it so I wonder if it displayed that error because the battery was too small? I'm not sure..
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08-28-2008, 04:04 PM | #35 |
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As a fortune cookie would say, "For the answers you seek.. look down at your right foot!"
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08-28-2008, 07:57 PM | #37 | |
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"Intelligent Alternator Control (IGR)Intelligent Alternator Control (IGR) is also referred to as Brake Energy Regeneration (BER) in the customer documentation.This new function of IGR, utilizes the previously unused kinetic energy produced in overrun or deceleration mode to drive the alternator. IGR generates the necessary electrical current demanded by the vehicle’s electrical system without having to use engine power, which translates to better fuel economy and less tail pipe emissions overall. In contrast to conventional power management systems, the battery must not be fully charged at all times but rather should maintain a charge level that is within certain limits. A fully charged battery cannot accept any more charge. When the driver lifts off the accelerator pedal and steps on the brake the system uses that otherwise wasted kinetic energy generated as the vehicle is stopped to replenish the battery state of charge. Ultimately as the driver applies the gas pedal the charging system is disabled to render the engines maximum power. IGR requires an intelligent battery sensor (IBS) on the negative terminal of the car battery and a communication interface on the alternator. In addition, vehicles with IGR use only AGM gel batteries that can withstand the large number of charge cycles. When servicing it is important to ensure that only that type of battery is fitted." http://www.1addicts.com/forums/showthread.php?t=4301
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08-28-2008, 07:59 PM | #38 |
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As is this:
Conforming to BMW’s Efficient Dynamics, these vehicles will include the following: • Run Flat Tires as standard eliminates the weight of a spare tire and jack.• Brake Energy Regeneration - The system increases the demand on the charging system under braking thus charging the battery when the vehicle is reducing speed which results in saving fuel. (see page 27) • Very light but rigid bodyshell. • Aluminum front axle with lightweight components like hollow anti-roll bars.
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08-29-2008, 07:47 AM | #40 | |
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I would love for the manual to be wrong. If the car doesn't have IR I could run the odyssey battery.:biggrin:
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