Hi everybody,

Since the All4 system distributes power as it sees fit, is anyone working on a mod so you can manually select your power distribution between the front and rear?

I have an empty pot that would be perfect for a 50/50 switch. I don't know if that's something that can be done, but I think it would be a pretty desirable mod. What do you guys think?

Thanks,
Shane

 

i have not heard of this ... i suspect that due to the nature of the system it is not possible

there is a lot of misinformation on the all4 system out there

the system starts from rest at 50/50 and progressivly goes to 100% front by ~80mph ... this is assuming no wheel slip is detected and you are traveling in a relatively straight line

if slip is detected or steering deflection is detected, power is sent to the wheels that have traction, up to a 50/50 split and if DSC has intervined and reduced engine power, up to 100% of the reduced available power (but not more than 50% of total power) may be sent to the rear wheels in extreme conditions

scott

 

That's great information for the thread. I had read about how it works on a different forum. I still think a manual override that leaves the split at 50/50 could be useful. I enjoy that Mini lets you disable DTC and DSC. I think it would be cool to be able to select 50/50 or 100% front wheel drive with a similar switch.

 

It would be a pretty nifty feature.

The All4 starts putting power to the front wheels and once the speed gets up a tiny bit it starts sending power to the rear.

Youtube video of mine on a dyno

 

Both of you can't be right.

 

i got my info from an article on motoringfile ... it was an interview with the bmw/mini erngineer in charge of the all4 development

scott

 

http://www.motoringfile.com/2011/12/...tem-clarified/

 

It is 50/50 then it goes to the front as power increases.

However watch the video of mine on a dyno. I was amused by the fact that the front wheels spin before the rear does... Due to the drivetrain losses through the AWD system, the front wheels spin for a moment before the rear.

Also... my countryman got up to 160 kph on that dyno and the rear wheels are still spinning strong. Looks to me like the power never truly goes 100% to the front.

 

I believe it never goes full front wheel drive because it thinks it's loosing traction. If the front wheels are spinning and the rear wheels slow down, the computer detects that as slipping and sends power to the rear.

 

Cool video!

I'm guessing that real wheel engagement is the ECU freaking out that the front wheels are driving but the rear wheels are stationary. I've seen similar happen after fwd cars have left the dyno. The ECU gets confused what just happened