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      04-11-2009, 04:56 PM   #67
xDrive50i
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Quote:
Originally Posted by Fastbuck View Post
There must be an error in my brochure then which states;

"Make use of every Watt: by charging the battery only when your BMW is braking, coasting or decelerating, Brake Energy Regeneration improves fuel efficiency by up to three percent and ensures that the full power of your engine is available for acceleration.


Today's vehicles require much more electrical energy than older models, due to the much wider array of electric and electronic on-board comfort and safety systems. This energy is created by the generator (also known as the alternator) which converts the engine's power output into electricity. In conventional systems, the generator is permanently driven by a belt connected to the engine.

BMW's Brake Energy Regeneration operates differently: the generator is activated only when you take your foot from the accelerator or apply the brake. The kinetic energy that would otherwise go to waste is now used efficiently, converted into electricity by the generator and stored in the battery.

Producing electricity in this highly efficient way delivers an additional advantage: when you apply the accelerator, the generator is deactivated - so the full power of the engine can be directed to the drive wheels. Brake Energy Regeneration thus increases fuel efficiency while simultaneously enhancing driving dynamics. As a safety precaution, the Brake Energy Regeneration system monitors the level of battery charge and will, if necessary, continue to charge the battery even during acceleration to prevent a complete discharging of the battery."
That's EXACTLY what I was referring to in post #58!

This is listed in the German brochure (and I guess in yours too) as well as the international version. However as I indicated in post #58:

Quote:
I have yet to see any car for the North American market that actually has that feature.
In the picture that shows the engine, you can see that the alternator is directly connected to the engine via a belt. The pulley that drives the alternator is directly mounted on the alternator shaft, hence the alternator would always be running....

I was just wondering why they would build this into the European market models but not into the North American market models?!?
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      04-11-2009, 05:50 PM   #68
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Perhaps there is an electromagnetic component there after all?
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      04-11-2009, 07:46 PM   #69
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Quote:
Originally Posted by Fastbuck View Post
Perhaps there is an electromagnetic component there after all?
Just had a look through the parts database and compared the 730d to the 740 and 750 models. The only difference I found is that the 730d has two different alternators listed depending on what options you have in your car. There is a smaller 180A alternator or the 230A alternator that is standard on the 740 and 750 models. Interestingly enough, the parts database shows a 230A alternator while the brochures talk about a 210A alternator?!?

Anyway, as per the pictures below, there is no clutch that can disconnect the alternator from the drive belt...

The 230A alternator (part number 12 31 7 575 347) as found on the 750:

Name:  750_Alternator.jpg
Views: 792
Size:  151.7 KB


The 230A alternator (part number 12 31 7 573 755) as found on the 740:

Name:  740_Alternator.jpg
Views: 795
Size:  217.8 KB


The 180A alternator (part number 12 31 7 808 074) as found on the 730d and 230A alternator (part number 12 31 7 808 075) in the fully optioned 730d :

Name:  730d_Alternator.jpg
Views: 747
Size:  58.4 KB
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      04-12-2009, 02:14 AM   #70
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Those pesky germans must be telling lies for sure then.
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      04-12-2009, 03:27 PM   #71
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holy shit!
AMG AND S8 THAT!!!!!!!!!!!!

WOW!!!!!!!!!!!!!!
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      04-17-2009, 02:47 AM   #72
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grill is waaaaay too big.. looks retarded in the front.. .what a fail
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      04-18-2009, 12:00 AM   #73
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Quote:
Originally Posted by rsmamg View Post
grill is waaaaay too big.. looks retarded in the front.. .what a fail
I like those big grills, I think they look awesome! They make the car look VERY aggressive...
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      04-18-2009, 06:50 AM   #74
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Quote:
Originally Posted by rsmamg View Post
grill is waaaaay too big.. looks retarded in the front.. .what a fail
have you actually seen the car in person...?
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      04-18-2009, 04:34 PM   #75
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looks AMAZING!
rather would of seen it more dropped.
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      04-22-2009, 07:09 AM   #76
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I know what my next car is
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      04-22-2009, 11:52 AM   #77
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Originally Posted by Ryouken View Post
I know what my next car is
+1

I hope they are going to release a 760 xDrive version (preferably with the DPC system!) with Integral Active Steering. Now that would be perfect
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      07-08-2009, 05:15 PM   #78
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simulation

Excellent report... I couldn't help but wonder what the stats translate to. So I made a simulation for the 760i, the torque I used is just preliminary and may need to be ironed out a bit to account for drivetrain loss. Here is a video


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