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marcx5 09-05-2006 10:59 AM
what is dynamic x drive?
 
i hear that 'dynamic x drive' is 'rumored' to be available in the future, but not with initial x5's.... is that true? and if so, what is 'dyanmic x drive' vs. the regular x drive. how is it better?


thanks.

motordavid 09-05-2006 12:39 PM
Dunno...I went back and reread the PR, but the only section
I could find that seemed related was this paragraph on Traction
Control which seems to "numb"/delay the onset of the DSC.

Or, it could be a tweaking of the XDrive itself...
Hard to know at this point.
GL,mD



Dynamic Traction Control for greater spin and more dynamic performance.
Reflecting its high standard of driving dynamics, the new BMW X5 also comes with Dynamic Traction Control. All the driver has to do to activate the DTC mode is press a button on the center console. This raises the threshold for intervention of the engine and brakes by DSC, allowing the BMW X5 to set off smoothly on loose snow or sand with the drive wheels intentionally spinning slightly. Last but certainly not least, DTC promotes an even more sporting and active style of driving by allowing more wheel-spin before intervening.

scott27 09-05-2006 02:50 PM
Quote:
Originally Posted by marcx5
i hear that 'dynamic x drive' is 'rumored' to be available in the future, but not with initial x5's.... is that true? and if so, what is 'dyanmic x drive' vs. the regular x drive. how is it better?


thanks.
We can say Dynamic xDrive (= DxD) is Ver. 3.0 xDrive - it has been already tested in E70 prototypes so most of us, and most of automotive press thought DxD would be offered in E70 from the begining. But these were initial tests only.The system is still being tested X6 prototypes (right now under E70 mules). Development is still not over yet - some tweaks should still be done before new system will be offered in production cars. X6 (coming in 2008) will debut the new system.

Dynamic xDrive is similar to Honda / Acura's SH-AWD: it is able to distribute torque not only front vs rear, but also left vs right. With Ver. 2.0. xDrive DSC, ABS, etc systems can brake seperate wheel so in the most extreme limits e.g. rear right wheel can get 50% of all torque available to the wheels (100% torque to rear axle, left wheel totally braked). With Dynamic xDrive in the same case 100% torque will be distributed to the specific wheel, so no perfomance will be lost (like today). This will be the most important new feature of Ver 3.0 xDrive, others will include even better collaboration of xDrive & other systems (DSC., ABS, gearbox, suspension, engine etc), FlexRay data transfer protocol also for xDrive, etc.

After debuted in X6 Dynamic xDrive will then be creep in other new BMW vehicles (V5), current models will get it with facelift (X5, 3er), or with new generation (7er, 5er, X3).

marcx5 09-05-2006 04:25 PM
Quote:
Originally Posted by scott27
We can say Dynamic xDrive (= DxD) is Ver. 3.0 xDrive - it has been already tested in E70 prototypes so most of us, and most of automotive press thought DxD would be offered in E70 from the begining. But these were initial tests only.The system is still being tested X6 prototypes (right now under E70 mules). Development is still not over yet - some tweaks should still be done before new system will be offered in production cars. X6 (coming in 2008) will debut the new system.

Dynamic xDrive is similar to Honda / Acura's SH-AWD: it is able to distribute torque not only front vs rear, but also left vs right. With Ver. 2.0. xDrive DSC, ABS, etc systems can brake seperate wheel so in the most extreme limits e.g. rear right wheel can get 50% of all torque available to the wheels (100% torque to rear axle, left wheel totally braked). With Dynamic xDrive in the same case 100% torque will be distributed to the specific wheel, so no perfomance will be lost (like today). This will be the most important new feature of Ver 3.0 xDrive, others will include even better collaboration of xDrive & other systems (DSC., ABS, gearbox, suspension, engine etc), FlexRay data transfer protocol also for xDrive, etc.

After debuted in X6 Dynamic xDrive will then be creep in other new BMW vehicles (V5), current models will get it with facelift (X5, 3er), or with new generation (7er, 5er, X3).
thanks for the explanation. i can't believe honda/acura beat BMW to this feature... when the x5 is supposed to be the best awd system. i also wonder how much better that system really performs and if it is a noticeable difference.

is the difference noticeable between the original x5 awd system in 2002ish vs. the new one that came out in 2004?

scott27 09-05-2006 04:57 PM
Dynamic xDrive is even more dynamic driving / performance driving capable - especially traction & stability in high speed cornering are improved. It will provide even better handling & steering. There will be also off-road advantages.

Pair Dynamic xDrive with Adaptive Drive / Dynamic Drive system -> perfect combination.

SH-AWD is heavier and not so much connected to other car systems like Dynamic xDrive will be - also thanks to FlexRay. So Dynamic xDrive is expected to be more efficient than SH-AWD. The idea behind both systems is identical, but realisation is different.

Btw, mind that BMW are quite new to AWD systems - they are enhaching the system with time. New testing facilities, and better colaboration with outsource engineers are providing much quicker & more efficient development.

SuperGreg 09-06-2006 09:21 AM
Quote:
Originally Posted by scott27
Dynamic xDrive is even more dynamic driving / performance driving capable - especially traction & stability in high speed cornering are improved. It will provide even better handling & steering. There will be also off-road advantages. .
I love your follow up explanations Scott. You are a valuable resource here, and I for one would like to thank you for your support :thumbup: .

LeMansX5 09-06-2006 01:59 PM
Quote:
Originally Posted by SuperGreg
I love your follow up explanations Scott. You are a valuable resource here, and I for one would like to thank you for your support :thumbup: .
:iagree:

marcx5 09-06-2006 03:20 PM
so can someone easily and simply explain the different awd systems in the x5 over the years ? here's my understanding:

1) original x5's: 60% rear and 40% front under normal conditions. Car can apply brakes to any given wheel, but maximum power a single front wheel is 20% and a single rear wheel is 30%.

2) 2004 models: same ratio as above, but now car can also distribute power front to back, so 100% can go to front or rear wheels. braking individuals wheels are the same, so max at one front wheel is 40% and one rear wheel is 60%

3) new 2007 models: same as system introduced in 2004???

4) next generation, 2008? DYNAMIC x-drive: same ratios as above, but then power can be distributed 100% front to rear AND 100% left to right... meaning any one wheel can receive 100% power.

did i get that right???

thanks.

JCL 09-06-2006 04:01 PM
Quote:
Originally Posted by marcx5
did i get that right???
Not sure about the front/rear 40/60 in 1st generation, I have heard 40/60 and 38/62, but not sure it matters.

Now, since you want to be precise, the more important issue is that you used the word power in your summary. Power does not equal torque. Scott27's very detailed explanation used the technical term torque. Power is a function of torque and speed. In the Gen 1 and Gen 2 AWD systems, all of the power sent to a specific axle can go to the non-braked wheel, but that will equate to half the torque, in this idealized example.

marcx5 09-06-2006 04:43 PM
Quote:
Originally Posted by JCL
Not sure about the front/rear 40/60 in 1st generation, I have heard 40/60 and 38/62, but not sure it matters.

Now, since you want to be precise, the more important issue is that you used the word power in your summary. Power does not equal torque. Scott27's very detailed explanation used the technical term torque. Power is a function of torque and speed. In the Gen 1 and Gen 2 AWD systems, all of the power sent to a specific axle can go to the non-braked wheel, but that will equate to half the torque, in this idealized example.
the actual #'s from front/rear (60/40, etc.) doesn't really matter to me, i just want to understand generally how things are different between generations and how that translates to real world driving experiences.

you maybe right on the "power' term... i'm not an engineer.... thanks for the clarification.


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