[PVC]

Originally Posted by SleepingBMW

Probably correct.

So the current Audi A3 uses a Haldex system, which is very nice compared to older gens. Nice becuase
1. It's electronically controlled and thus can preempt a slip
2. It's low weight at only ~250lbs


Which makes it the most simple and light AWD option.

I don't know the details of the M based X drive but best case scenario is it's some kind of reverse Haldex system where it can activate the front axle when needed. Which means best case scenario we are at 4K lbs. I really am guessing that BMWs system will weigh more due to the power going back then front again and we're talking 500hp of robust strength here the Haldex system in Audi is really not for more than 420 or so based on some breaks I've seen.

Of course a proper AWD is going to be even more weight than the Haldex if that's the way bmw does it.

They're not developing it from scratch. They're likely taking it from the existing X3/X4, which is probably the same system that's used in M5/M8.

[NISFAN]

Originally Posted by PVC

They're not developing it from scratch. They're likely taking it from the existing X3/X4, which is probably the same system that's used in M5/M8.

It's an off the shelf system from ZF (extension to the RWD ZF8). Longitudinal RWD gearbox with extra transfer case addition. Chain drive front PTO plus wet multi-plate clutch packs to distribute torque. Electronically controlled.

[brava09]

Empty weight of the xdrive M4 on the official BMW site is at 1850 kg which is 4078.552 lb

[Sbm007]

Originally Posted by xcusem3

Yes the awd system will inevitably add 250-300lbs to this car, just wait! Why do you think that bmw hasn't told us the weight figures of the 4x4 cars yet..?

Originally Posted by SleepingBMW

Probably correct.

So the current Audi A3 uses a Haldex system, which is very nice compared to older gens. Nice becuase
1. It's electronically controlled and thus can preempt a slip
2. It's low weight at only ~250lbs


Which makes it the most simple and light AWD option.

I don't know the details of the M based X drive but best case scenario is it's some kind of reverse Haldex system where it can activate the front axle when needed. Which means best case scenario we are at 4K lbs. I really am guessing that BMWs system will weigh more due to the power going back then front again and we're talking 500hp of robust strength here the Haldex system in Audi is really not for more than 420 or so based on some breaks I've seen.

Of course a proper AWD is going to be even more weight than the Haldex if that's the way bmw does it.

BMW M xDrive system weights 50 kg/110 lbs:

1. 1805 kg - M3 Competition - https://www.bmw.de/de/neufahrzeuge/m...che-daten.html
2. 1855 kg - M3 Competition M xDrive- https://www.bmw.de/de/neufahrzeuge/m...-m-xdrive.html

The 50kg weight delta is also mentioned on the M xDrive overview video on the BMW M YouTube channel:

[CanAutM3]

Originally Posted by SleepingBMW

Probably correct.

So the current Audi A3 uses a Haldex system, which is very nice compared to older gens. Nice becuase
1. It's electronically controlled and thus can preempt a slip
2. It's low weight at only ~250lbs


Which makes it the most simple and light AWD option.

I don't know the details of the M based X drive but best case scenario is it's some kind of reverse Haldex system where it can activate the front axle when needed. Which means best case scenario we are at 4K lbs. I really am guessing that BMWs system will weigh more due to the power going back then front again and we're talking 500hp of robust strength here the Haldex system in Audi is really not for more than 420 or so based on some breaks I've seen.

Of course a proper AWD is going to be even more weight than the Haldex if that's the way bmw does it.

As an owner of an RS3, I can attest that the Haldex system used in that chassis is NOT the best AWD system, being primarily a FWD that can send an actual maximum of 50% to the rear axle. The real Torsen Quattro we had in our previous B7 S4 was a much better system.

That being said, the system in the M3/4 is exactly as you say, where it is primarily a RWD system that can send torque to the front axle as needed, which is much better for handling dynamica. BMW confirmed that the AWD weighs ~50kg/110lb more than the RWD car.

[CanAutM3]

Originally Posted by brava09

Empty weight of the xdrive M4 on the official BMW site is at 1850 kg which is 4078.552 lb

You are quoting EU weight, which includes 75kg for driver and some luggage...

[Flamingi]

Originally Posted by CanAutM3

You are quoting EU weight, which includes 75kg for driver and some luggage...

Also, that's the weight for the base model, which does not include CCB or the carbon buckets.